太空質子輻射測試技術與應用

林聰得副研究員

(國家原子能科技研究院 機械及系統工程研究所)

<專題討論>2025/5/15(四)14:10綜合大樓2樓48218教室

微奈米科技在生物醫學感測之應用

蔡田畯執行長(成大核心設施中心)

<專題討論>2025/5/1(四)14:10綜合大樓2樓48218教室

新世代高效率太陽電池技術發展與應用

謝伯宗資深研究員(工業技術研究院綠能與環境研究所)

<專題討論>2025/4/17(四)14:10綜合大樓2樓48218教室

General practices of radiation tests in Taiwan for space applications

林志勳博士(中央研究院物理研究所)

<專題討論>2025/3/27(四)14:10綜合大樓2樓48218教室

Nano/microscale Photo-thermal-fluidic coupled transport phenomena in solar energy conversion and laser-assisted microfabrication processes

李明蒼教授/主任(清華大學動力機械工程學系/清華大學科儀中心)

<專題討論>2025/3/13(四)14:10綜合大樓2樓48218教室

This presentation focuses on enhancing photo-thermal energy harvesting, conversion, and utilization by applying nanotechnologies and nanomaterials. The first topic is a solar-thermal reformer for efficient fuel conversion and solar-drying of moisture in microporous media using silicon nanowires (black silicon) as the solar energy absorber, especially on the effects of wavelength-dependent optical properties and coupled heat and mass transfer in nano/microscales. Secondly, recent progress in our lab on the multiphase and multiphysics coupled transport analyses to uncover the fundamental physics governing the energy conversion, laser-materials interactions, interfacial transport phenomena, and surface reconstruction, as well as the formation of nanoporous structures of micro patterns fabricated by laser additive manufacturing processes will be introduced. For low-temperature laser processes in a reacting liquid environment, a thermocapillary model to elucidate the mechanisms of the evolution of micropattern surface morphology and an analytical method for the reaction and micro vapor bubble dynamics during laser-induced reductive reaction and deposition process were successfully developed. For high-temperature laser additive manufacturing processes, to investigate the complex transport processes while maintaining reasonable computational costs for laser additive manufacturing processes, a comprehensive thermal-mechanical model based on a novel quasi-transient heat source concept was proposed and validated with experiments. The predicted molding appearance from this model exhibited a relative error of less than 5% in the width of the fabricated workpiece. A two-stage coupled transient thermomechanical model was then extended by incorporating this quasi-transient heat source concept. Notably, the results from this quasi-transient thermomechanical model closely agreed with experimental data in residual stress considering the re-melting due to overlapping laser scanning and are consistent with the results from a conventional transient model with nearly 70% reduction in computation cost. In the last section of this talk, a novel microfabrication process for direct deposition and patterning of transparent conductive oxide (TCO) and semiconductor materials on glass substrates by coupling laser and atmospheric pressure plasma jet (APPJ) will be introduced. The prospective impacts of these technologies on emerging engineering challenges and applications will be discussed.

氣體感測從理論到物理AI應用

劉驊興博士候選人(成大物理系)

<專題討論>2025/2/27(四)14:10綜合大樓2樓48218教室

FAST project and its physics and technological issues

Professor Akira Ejiri (The University of Tokyo)

<邀請演講>2024/12/10(二)10:10綜合大樓1樓48111B教室

FAST is a project started recently aiming at DT burning plasma and related R&D (https://www.fast-pj.com/en). The project is a private-sector-led industry-academia collaboration. The mission is to demonstrate electricity generation by the 2030s. The demonstration, here, is “Heat extracted from the blanket is used to produce 10 MW of electricity for 15 min”. The necessary specifications for the R&Ds are (i) fusion power: 50 – 100 MW, (ii) Discharge duration: 1000 sec, (iii) neutron wall loading: 0.3 – 1 MW/m2, (iv) Full power operation time: 1000 hr. Note that TBR > 1 and high Q are not required. Physics and technological issues will be presented in the talk.

自我觀照暨心輔組介紹

黃威仁心理師(心輔組)

<專題討論>2024/11/28(四)14:10綜合大樓2樓48218教室

Experiments in the Pulsed-plasma Laboratory (PPL)

張博宇所長(太空與電漿科學研究所)

<專題討論>2024/11/14(四)14:10綜合大樓2樓48218教室

Varies experiments using pulsed-power systems conducted in the pulsed-plasma laboratory will be introduced. They include experiments of exploding wires, shock generation using flyer plates impacting a target, pulsed-plasma thruster using an unbalanced theta pinch, and developments of the Formosa Integrated Research Spherical Tokamak (FIRST).

應用於雷射衛星通訊的光纖放大器及其光纖元件

蘇晉鋒博士(萊凌科技股份有限公司)

<專題討論>2024/10/24(四)14:10綜合大樓2樓48218教室

雷射基本原理及其多元應用

洪宗彬助理教授(國立高雄科技大學模具工程系)

<專題討論>2024/9/26(四)14:10綜合大樓2樓48218教室

Investigation of Highly Charged Inert Gas Ions Measured in Impurity Seeding Experiment at Large Helical Device Through Detailed Atomic Structure and Electron-Ion Collision Calculations

Dr. Shivam Gupta (National Institute for Fusion Science, Japan)

<專題討論>2024/6/6(四)14:10綜合大樓2樓48218教室

The study of spectral lines emitted from individual extrinsic impurities in high-temperature tokamak devices plays an essential role in diagnosing the fusion plasma in their edge and core regions through various diagnostic methods [1]. In large-scale fusion plasma devices such as ITER and CFETR, etc. higher atomic Z elements (e.g. Kr and Xe) are considered to be suitable to serve as the impurity seeding element for the X-ray Crystal Spectrometer (XCS) diagnostics [2]. The contribution of each charge state of the highly charged Kr and Xe ions has not yet been clarified  in  detail  in  high-temperature  fusion  plasma,  and  their  detailed  atomic  data  and collision cross-section data are required for plasma modeling purposes.

In view of this, Extreme Ultraviolet (EUV) spectral diagnostics of highly charged Kr and Xe ions were programmed for the 24th campaign of the Large Helical Device (LHD). In the present work, Collisional-Radiative (CR) model calculations were carried out for the Kr25+ and Xe25+charge state. An impurity seeding experiment was conducted using the Kr and Xe gases. In the experiment,  LHD  plasma  was  ignited  using  the  electron  cyclotron  heating  system,  while Negative-ion-based Neutral Beam Injection (N-NBI) #1-3 was utilized to sustain the plasma from 3.3-7.3s. Kr and Xe gases were injected at 4.0s, and emission spectra of highly charged Kr and Xe charge states were measured in the EUV wavelength regions. The detailed spectral analysis of measured Kr and Xe-ions was performed to validate the theoretical collisional data and  CR  model  calculations. The  CR  model  calculation  included various  population  transfer kinetic processes among the fine structure levels of the considered Kr and Xe ions. Detailed atomic  structure  and  collision  calculations were performed  for  the  excitation  energies, oscillator  strengths,  wave  functions,  and  their  cross-sections  for  various  fine  structure transitions from the ground state and excited states to the other fine structure levels using the Flexible Atomic Code (FAC) [3]. Further, these calculated data incorporated into the CR model to  solve  the  kinetic  rate  balance  equations.  Theoretical  synthetic  spectrum was generated through  the  population  of  the  considered  fine  structure  levels  of  the Kr  and Xe ions.  The comparison  of  theoretical  spectra  with  the  LHD-measured  spectra  validated the  atomic structure  and  collision  data  calculations  prominent  for  spectroscopic  diagnostics  of  future fusion plasma experiments in different tokamak devices.

References

[1] A Kallenbach et al, Plasma Phys. Control. Fusion 55, 124041 (2013).

[2] D. Lu et al, Nuclear Fusion 63, 056002 (2023).

[3] M. F. Gu, Can. J. Phys. 86, 675 (2008).

銲接製程介紹與應用

汪立德組長(金屬工業研究發展中心銲接組)

<專題討論>2024/5/16(四)14:10綜合大樓2樓48218教室

電漿科技於鍍膜技術的相關應用

葉昌鑫博士(金屬工業研究發展中心能源與精敏系統設備處)

<專題討論>2024/5/2(四)14:10綜合大樓2樓48218教室

星與你的距離，GNSS定位系統原理介紹

吳國禎工程師(台灣羅德史瓦茲有限公司)

<專題討論>2024/4/18(四)14:10綜合大樓2樓48218教室

電漿科技於生活應用

劉志宏博士(工研院機械所)

<專題討論>2024/3/28(四)14:10綜合大樓2樓48218教室

人造衛星整測概論與實務

林志陽正工程師(國家太空中心衛星整測組)

<專題討論>2024/3/14(四)14:10綜合大樓2樓48218教室

英語寫作

吳少方 老師(國立成功大學外語中心)

<專題討論>2024/2/29(四)15:30綜合大樓2樓48218教室

本次課程列為研究生通識，切勿缺席以免影響畢業! 

溫室氣體碳盤查  

朱繼文 經理(日昇科技股份股份公司)

<專題討論>2023/11/30(四)14:10綜合大樓2樓48218教室

英語口語表達  

吳少方 老師(國立成功大學外語中心)

<專題討論>2023/11/16(四)15:30綜合大樓2樓48218教室

Atmospheric-pressure Plasma Effects on Cancer Cells and RONS Generation for Medical Applications

鄭雲謙 教授(國立陽明交通大學 機械工程學系)

<專題討論>2023/11/2(四)14:10綜合大樓2樓48218教室

We compared the effects of plasma with thermal therapy on lung cancer with malignant pleural effusion. This study find out that the plasma can selectively kill lung cancer cells and the benign cells remain its viability. Besides, the thermal therapy kills both cancer cell and benign cells. To investigate what is the plasma factor that inhibits cancer cells, we investigated the effects of plasma-generated short-lived species, long-lived species, and electric fields on skin melanoma and basal cell carcinoma cells (A2058 cells, BCC cells) and normal cells (BJ cells, Detroit 551 cells) and found that the short-lived species do make selective inhibition to the benign and malignant cells. The second part of my study is that we mix water aerosol with plasma jet at downstream region makes the plasma jet generate more • OH. We designed different mixing chambers and adjusting the water aerosol flow rate maximize the • OH generated by plasma jet for biological applications. We also constructed an impedance matching circuit for a partial-discharge calibrated (PDC) atmospheric-pressure plane-to-plane DBD equivalent circuit. The last part of my work is that we used machine learning to distinguish the discharge current of different plasma. The plasma discharge can be different depending on the conditions, and the resulting discharge current has quite different electrical features. Hence, a real-time and cost-effective diagnosis of atmospheric-pressure plasma discharge can be possibly provided via current classification with deep learning model.  

太空一站式服務，打造不可取代的航太解決方案

陳彥彰 副理(立創光電股份有限公司)

<專題討論>2023/10/19(四)14:10綜合大樓2樓48218教室

Experimental Demonstration of Langmuir Wave Supercontinuum in a Laboratory Plasma

電漿所李宗懋博士生

<博士班論文公開演講>2023/6/16(五)14:10綜合大樓2樓48218教室

適用智慧車輛的車道級定位技術: 挑戰與機遇     

江凱偉 教授(成功大學測量及空間資訊學系) 

<專題討論>2023/5/11(四)14:10綜合大樓2樓48218教室演講 

隨著運輸方式的轉變以及科技的革新，汽車具有智慧化、電動化與聯網化的趨勢，藉由新一代技術可實現行車安全、節能環保、舒適行駛以及提高交通效率等目標。智慧聯網電動車藉由搭載先進的車載感知感測器、導航感測器、行車決策與控制電腦等裝置，並融合現代通信與網路、人工智慧等技術，實現車聯網(V2X)智慧資訊交換與共用，具備複雜環境感知、智慧決策、協同控制等功能，其中安全的導航技術扮演重要的角色亦是實現行車安全的關鍵，而最終智慧聯網電動車以系統代替人類完全自動駕駛任務為終極目標。為實現自動駕駛(Level 3以上)，車道內(In-Lane)(<0.5公尺)等級的定位精度是不可或缺的，此外導航系統必須具備高環境適應力與容錯性，以確保汽車在任何場景、時刻皆可安全、穩定的行駛，因此多元感測器的融合架構已成為普遍的發展趨勢。

本場講座主要討論適用智慧聯網電動車的車道級定位技術發展的背景、現行技術的限制與未來多元感測器融合架構的在智慧車輛安全導航應用發展趨勢與機遇，同時分享本研究室成員在這個議題下歷年累積的研究成果。

CFD與粒子法於流道反應管混合技術應用   

李芳承 博士(工業技術研究院南分院) 

<專題討論>2023/4/27(四)14:10綜合大樓2樓48218教室演講 

1. 流道反應器(Reactors)

2. FEM & SPH粒子法差異

3. 多相混合技術克服

4. Cases Study       

英語寫作 

吳少方 老師(國立成功大學外語中心) 

<專題討論>2023/4/13(四)16:00綜合大樓2樓48218教室演講    

Relativistic ion acceleration with intense laser pulses    

Prof. Yasuhiro Kuramitsu(Department of Electrical Engineering, Osaka University, Japan) 

<專題討論>2023/3/23(四)14:10綜合大樓2樓48218教室演講

We conducted laser ion acceleration experiments using large-area suspended graphene (LSG) as the target. Graphene is the thinnest and strongest 2D material but possesses extremely high thermal and electrical conductivities and extremely low optical reflectivity. We are able to control the LSG thickness as one of the experiment parameter by transferring graphene layer by layer. Based on the LSG technique, we conducted a series of experiments on the laser driven ion acceleration with a diverse parameters of laser such as energies from a few J to kJ, pulse durations from fs to ps, intensities from sub-relativistic to relativistic. 

In this talk, we report our experimental results on energetic ion acceleration with LSG and introduce some novel applications on laboratory astrophysics and nuclear physics.                      

超快雷射與應用    

葉昭永 博士(金屬工業研究發展中心) 

<專題討論>2023/3/9(四)14:10綜合大樓2樓48218教室演講

電子零件輻射測試簡介    

曾達麟  協理(宜特科技股份有限公司) 

2022/12/8 14:10 R.48218 –2nd floor of Composite Building

1.輻射基本概念

2.太空輻射環境

3.輻射對電子零件的效應

4.輻射測試參考文件

5.輻射測試規劃與流程

6.輻射測試實驗室                                          

無人機簡介     

詹英傑  研發長 (經緯航太科技股份有限公司) 

2022/11/10 14:10 R.48218 –2nd floor of Composite Building

低軌衛星產業應用發展     

李柏緯 副處長 (鐳洋科技股份有限公司) 

2022/11/10 14:10 R.48218 –2nd floor of Composite Building

低軌衛星通訊(Low Earth Orbit, LEO)為近年來廣為被大家關注的話題，有別於早期的同步軌道衛星，衛星的高度約莫在500 ~ 1500公里之距離，其衛星相較於地面的移動速度高達每秒7.5 公里。如此高速的移動速度，在天線設計上使用傳統的碟型天線將面臨到追蹤速度(機械式)無法跟上衛星移動速度，因此在天線設計上改以陣列天線設計，其波束追蹤方法從機械式改為電子式波束追蹤。本講題首先介紹近年來衛星產業發展趨勢，然後再實際以地面接收站為例，為各位聽眾介紹地面接收應用之陣列天線設計。

大氣電漿應用      

黃旭璀 總經理(三方機械工業股份有限公司)

2022/10/20 14:10 R.48218 –2nd floor of Composite Building

超音波加工原理及應用      

洪宗彬 副教授(正修科技大學 機械工程學系)

2022/10/6 14:10 R.48218 –2nd floor of Composite Building

超音波加工是利用具有超音波振動的工具在被加工元件上進行，切削、焊接、研磨…。 在有磨料的液體介質中或具有固定磨料工具，高頻振動的工具會帶動磨料衝擊、拋磨或液壓沖擊所產生的氣蝕作用來去除材料。

衛星整合與測試工程      

林志陽 工程師(國家太空中心 )

2022/9/22 14:10 R.48218 –2nd floor of Composite Building

摘要

1.   Space Environment

2.   Satellite Integration & Test Flows

3.   NSPO’s Environmental Test Facilities

真空系統與真空元件簡介      

林茂松  資深工程師(日揚科技股份有限公司 )

2022/5/12 14:10 R.48218 –2nd floor of Composite Building

Introduction to Low Earth Orbit (LEO) Satellite Communications (SatCom) System    

梁庭榕  博士(工業技術研究院 資訊與通訊研究所)

2022/4/28 14:10 R.48218 –2nd floor of Composite Building

The Low Earth Orbit (LEO) Satellite Communications (SatCom) System will be introduced with four parts in this presentation. Firstly, the basics of LEO SatCom, including satellite behavior in different orbits, single LEO vs constellation, SatCom architecture, services and frequency spectrum, will be step by step explained. In the second part, the business opportunities regarding market trend, ITU Frequency regulation, LEO operator’s activities, market values, will be sequentially expressed, followed by the analysis and potential action items of the SatCom supply chain in Taiwan. In the third part, the challenges in technology will be commented, including the topics relating to application requirement review, mission definition review, system definition review, system design and system realization in the field of both space and ground segments. Finally, current government’s activities will be presented, following by a short prediction of potential action items in the near future.

Vision 2030 — enabling UAV shipping, real-time satellite imaging, and self-driving cars    

王毓駒 董事長/執行長(創未來科技有限公司)

2022/4/7 14:10 R.48218 –2nd floor of Composite Building

Phased array technologies have evolved into a stage where many applications can be fulfilled using hardware with much lower cost, smaller size, and higher portability. This would enable various exciting applications such as UAV shipping, real-time satellite imaging, and self-driving cars, in the few years to come. In this talk, progresses in various phased-array-based applications in Tron Future Tech will be introduced, including portable drone surveillance radars, satellite imaging radar, satellite communication with automobiles, and their potential of enabling the aforementioned applications in smart cities will be explained. However, these developments and prospects also raise many challenges in both science and engineering. Potential challenges are highly desirable to be addressed for the realization of a 2030 vision and further developments.

應用電感耦合式電漿之光電元件薄膜封裝技術   

林東穎 經理 (工業技術研究院 雷射與積層製造科技中心)

2022/3/17 14:10 R.48218 –2nd floor of Composite Building

從天空到宇宙，ARRC的太空夢

 Prof. Shih-Sin Wei

Deputy Director, Advanced Rocket Research Center(ARRC), National Yang Ming Chiao Tung University

2022/3/3 14:10 R.48218 –2nd floor of Composite Building

講述火箭與太空的科普知識、相關產業、ARRC 的過去與未來、ARRC 的最新進展與展望、火箭科學家思維。

太空法、太空政策與台灣太空發展

黃楓台 博士

National Space Organization, National Applied Research Laboratories

2022/1/6 14:10 R.48218 –2nd floor of Composite Building

台灣第一部太空法已於2021 年5 月31 日經立法院三讀通過，這是台灣太空發展的重要一步。本次演講主要是要介紹國家太空法立法的歷程與主要內容，並透過太空計畫與政府高層的談話，闡述目前我國的太空政策。最後則是要討論我國立方衛星產業的挑戰及太空發展法的影響。

Characterization of a Single Microdischarge in Atmosperic-Pressure Air Dielectric Barrier Discharges

Assistant Professor Kun-Mo Lin

Department of Mechanical Engineering, National Chung Cheng University

2019/5/16 14:10 R.48218 –2nd floor of Composite Building

Atmospheric-pressure air dielectric barrier discharges (APADBDs) can be considered as one of the important plasma sources due to the developments in applications such as ozone generation, plasma-assisted combustion, active flow control, and pollution control. APADBDs are generated typically in either the coaxial or planar reactors featured as filamentary discharges with many current events observed during each voltage period as generally sustained by an AC power under few kHz frequency. These filaments, named microdischarges (MDs) in the literature, seem to occur randomly in both space and time. A single MD is the basic element producing reactive species (O, N, O3, etc.) and transferring charges across the gap between electrodes. Therefore, it is critical to understand the fundamental properties of a single MD for characterizing the APADBDs. An experimental platform was designed to investigate the statistical behavior of MDs generated in a planar APADBD reactor using a kHz sinusoidal power source. The features of a single MD are measured and compiled statistically. Moreover, numerical simulations provide another alternative to characterize a single MD generated in APADBDs. A semi-empirical 1.5D plasma fluid model is proposed to reveal the underneath chemical mechanisms taking place within the discharge column of a single MD.

Investigation of the equatorial ionization anomaly structure

Prof. Alexander Trofimovich Karpachev

Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation (IZMIRAN), Moscow, Russia

2019/4/23 13:10 R.48218 –2nd floor of Composite Building

The second lecture is devoted to the study and modeling of the structure of the equatorial ionosphere. The behavior of the equatorial ionosphere is completely determined by the extremely variable equatorial ionization anomaly (EIA). The characteristics of the EIA depend strongly on local time, longitude, altitude, geomagnetic and solar activity. The longitudinal and altitudinal variations can be investigated only by satellite data. Therefore, it is possible to explore entirety the EIA only by using the COSMIC data (Taiwan) for low solar activity and the Intercosmos-19 satellite (IZMIRAN) for high solar activity. This lecture is based on the results of the analysis of the EIA characteristics from the topside sounding onboard the Intercosmos-19. For the first time, a comprehensive pattern of variations in the EIA structure with local time, altitude, and longitude for all seasons was constructed and studied in detail. The EIA starts at 08 LT with the formation of a winter crest. The formation of EIA is associated with the action of solar ionization and the so-called fountain effect: electromagnetic drift directed upward takes the ionosphere plasma from the heights of the F2-layer maximum to great heights where it spreads along the magnetic field lines under the action of ambipolar diffusion, forming the crests of the anomaly. The summer crest appears only by 10 LT, it is located 3-4° farther from the equator than the winter one. During the equinox, the EIA at the development phase is also asymmetric: the southern crest appears first, but at noon the crests become symmetrical. During the day, EIA reaches its maximum development at 14 LT. The foF2 value over the equator and the degree of EIA development (EAI) at 12–14 LT vary with longitude according to changes in the velocity of the vertical plasma drift W. In the longitudinal variations of W, foF2 and EAI, the 4-th harmonic prevails at this time. In the evening 1.5–2.0 h after sunset (18-19 LT) burst in the vertical plasma drift velocity, the degree of EIA development rises to a maximum. The degree of EIA development after a maximum of 20-22 LT falls, but at midnight the anomaly is still rather well developed. After midnight, the foF2 maxima in the region of the crests of the anomaly, on the contrary, are farther from the equator, but this is apparently due to the action of the neutral wind. At 02 LT, in contrast to the morning hours, only the northern crest of the anomaly is clearly expressed. Thus, with high solar activity in any season, a well-pronounced EIA is observed from 12 to 24 LT. It reaches its maximum development by 20-22 LT. This is very different from the time of low solar activity, when EIA reaches the maximum at ~17 LT and completely decays by 20 LT.

The comparison of the EA structure for the high solar activity according to Intercosmos-19 and for low solar activity according to COSMIC will be discussed.

Challenges of Space Technology Research: Taiwan's Option for the Next Decade

Chair Professor Yei-Chin Chao

Department of Aeronautics and Astronautics, NCKU

2019/4/11 14:10 R.48218 –2nd floor of Composite Building

 In this talk, the first and second stages of the national space programs of the National Space Organization (NSPO) are first reviewed and the current difficulties and ambiguities of policy of the third stage national space program are then discussed. The current situation of space technology research in Taiwan, especially space technology research that supports the development of the national space program is reviewed. The challenges of Taiwan’s space technology researches to support the third stage national space program are evaluated and discussed. The feasible space technology developments for the next decade in Taiwan are also proposed, exclusively, the developments of boosted hybrid rockets as launch vehicles for future Taiwan sounding rocket programs and national space programs, and the development of power mobilized cubeSats for scientific and engineering payloads for orbital and suborbital experiments and exploration are discussed. 

Coaxial Helicity Injection and Compact Torus Injection Experiments by Magnetized Coaxial Plasma Gun

Prof. Masayoshi Nagata

Graduate School of Engineering, University of Hyogo, Japan 

2019/3/19 14:10 R.48111B –1st floor of Composite Building

The magnetized coaxial plasma gun (MCPG) can produce successfully the compact torus (CT) of a spheromak configuration and spherical torus (ST) plasmas. Thus, the MCPG is well utilized in many fusion plasmas and basic plasma physics experiments. 

Coaxial Helicity Injection (CHI) and Compact Torus Injection (CTI) are attractive fusion applications of the MCPG technology. The CHI is one of non-inductive current drive (plasma start-up and sustainment) methods in spheromak and spherical torus (ST) plasmas. The CHI current drive has been successfully demonstrated in SSPX (LLNL), HIST (U. Hyogo), HIT-II (U. Washington), NSTX (PPPL) and SPECTOR (General Fusion) devices. In the HIST experiments, we have investigated MHD relaxation, dynamo and magnetic reconnection which are related to mechanism of current drive and formation of closed flux surfaces. One of recent topics of CHI on STs is the study of the fast reconnection based on plasmoid instabilities. Intensive internal magnetic field measurements on HIST have recently verified the flux closure due to plasmoid-driven reconnection. 

The CT injection is used for the central fueling, density profile control, plasma rotation, disruption mitigation, ELM-like pulsed heat flux irradiation and so on. The advanced fueling technology should be developed for the fusion reactor. So far, the deep fueling by CT injection has been successfully demonstrated in JFT-2M (JAERI and U. Hyogo), QUEST (Kyusyu U. and U. Hyogo), TdeV (CFFTP, Canada) and STOR-M (U. Saskatchewan, Canada) tokamak devices. We have been conducting pioneering research in this area. The CT is a high density plasma (>1022 m-3) and is magnetically confined by internally self-generated magnetic fields. Thus the CT can be accelerated by the MCPG to a high velocity (> 300 km/s). The penetration mechanism of an injected CT plasmoid into the core plasma is associated with the magnetic reconnection physics.

In this seminar, we will introduce firstly the fundamental of CT/ST magnetic configurations and how to use the MCPG, and then talk about the recent topics of CHI and CTI experiments.

Long-lasting radial IMF events and their influence of dayside magnetosphere

Dr. Gilbert Pi

Faculty of Mathematics and Physics, Charles University Prague, Czech Republic 

2019/3/15 14:00 R.4811B –2nd floor of Composite Building

Long-lasting radial interplanetary magnetic field (IMF) events are one of the special solar wind conditions. These events are usually accompanied with low density, weak magnetic field strength, low temperature, and low fluctuations of each solar wind parameters; however, the unique IMF orientation can cause numerous interesting features in the dayside magnetosphere. When the radial magnetic field transits through the bow shock, the magnetic field will be enhanced in all components. After that, Bx will divert to the Y and Z components and form an asymmetric Bz polarization in the Northern and Southern Hemispheres near the magnetopause. This asymmetry will lead the dayside reconnections occur at different locations and create a complex structure of magnetopause and its boundary sublayers. These sublayers of (1) the inner part of the low-latitude boundary layer (LLBL) on closed magnetic field lines; (2) the outer LLBL on open field lines; (3) the inner part of the magnetosheath boundary layer (MSBL) formed by dayside reconnection in the Southern Hemisphere; and (4) the outer MSBL resulting from lobe reconnection in the Northern Hemisphere are identified by observation.

Torus Plasma Experiment for Exploring Application of Magnetic Reconnection Process on Fusion Plasma

Prof. Michiaki Inomoto

Graduate School of Frontier Sciences, The University of Tokyo, Japan

2019/3/5 13:10 R.48218 –2nd floor of Composite Building

Magnetically confined torus plasma is a potential candidate as a core plasma of a nuclear fusion reactor. Tokamak-type configuration has shown high performances on plasma confinement, stability, and controllability, and the world’s largest tokamak device ITER is under construction through international cooperation. However, tokamak’s low beta (= plasma pressure / magnetic pressure) limit requires expensive construction cost of fusion power plant. Since lowering the aspect ratio (= major radius / minor radius) of tokamak-type plasma will bring about improvement on the beta limit, “spherical tokamak (ST)”, which is a variety of tokamak configuration with aspect ratio lower than 2, attracts attention and is considered to be a potential cost-effective fusion core plasma. 

The ST concept has difficulty in initial plasma start-up because of its limited space near the geometrical axis. Thus, the center solenoid coil, which is employed in tokamak-type device to drive initial plasma current and to provide initial heating, must be removed or downsized in ST device. Center-solenoid-free start-up methods are investigated in many experimental devices, but the achieved plasma has not satisfied the plasma parameter such as plasma current, density and electron temperature required for a target plasma for additional heating.

Axial merging method is one of the candidates to provide center-solenoid-free start-up of high-beta ST plasma, in which two initially formed STs merge through magnetic reconnection in the presence of the guide (toroidal) magnetic field, which is perpendicular to the reconnection (poloidal) magnetic field. Magnetic reconnection between two STs is capable of heating the electrons in the vicinity of the reconnection point, however, its mechanism has not been identified in laboratory experiments yet. During ST merging start-up, electrons are effectively accelerated near the reconnection point where the reconnection electric field is approximately parallel to the magnetic field and will provide the local electron heating. Recent experimental results from soft X-ray observation in the UTST experiment show transient generation of energetic electrons accelerated along the field line during reconnection.

Exploring space science, generating coherent x rays and neutrons via developing a metallic ion thruster and a pulsed-power system

Assistant Professor Po-Yu Chang

Institute of Space and Plasma Sciences, NCKU

2018/12/20 14:10 R.48218 –2nd floor of Composite Building 

Two independent projects are being conducted in Pulsed-Power Generator for Space Science (PGS) laboratory to study space science, generating coherent x rays and neutrons. One is to build a metallic ion thruster using magnetron e-beam bombardments. The other one is to build a pulsed-power system. For the metallic ion thruster, the principle of e-beam evaporations is used to generate ions. Ions are first generated from a metallic target being evaporated and ionized by thermal emission electrons and are accelerated by electric fields to provide the thrust. Different from inert gas used in conventional plasma thrusters, the metal target is in the solid state, high density, easy to be stored and cheap. A mass flow rate of 8.0 ± 1.3µg/sec using Zn was measured. Therefore, let the parameter β be the ionization rate of the metal vapor, the estimated thrust is β mN with a power of 630 W assuming 5 kV accelerating voltage is used. The thrust is much larger than those provided from existing thrusters with similar powers to date. For the pulsed-power system, 6 kJ of energy is first stored in twenty 1 µF capacitors charged to 50 kV and is discharged to a load in a short period of time to provide high-power output. The preliminary data analysis of discharge test of two capacitors charged to 20 kV showed that a peak current of ∼ 30 kA was delivered. The extrapolated peak current of final design from this test is ∼ 500 kA with a rise time of ∼ 1 µs giving an output power of ∼ 10 GW. The system will be used to generate (1) plasma jets for studying space sciences specifically on interactions between solar winds and unmagnetized planets using conical wire arrays; (2) soft x-ray laser using capillary z-pinch; and (3) neutrons using dense plasma focus. Status of developments for both projects and proposed research topics will be introduced.

The study of streaming instability in space, astrophysical, and laboratory plasmas

Dr. Chun-Sung Jao

Astroparticle Physics Theory Group, DESY

2018/12/11 13:00 R.48218 –2nd floor of Composite Building 

With important applications to space, astrophysical, and laboratory environments, plasma wave excitation led by the drift energy of streaming particles (streaming instability) is an extensively studied phenomenon in plasma physics.  In the Sun-Earth environment, for instance, the electrostatic streaming instability is generally considered to lie in the origin of the observed electrostatic solitary waves and in the core mechanism of type III solar radio bursts.  As in astrophysical environments, a non-resonant type electromagnetic streaming instability is also proposed as a candidate for the amplification of interstellar magnetic fields in the upstream region of supernova remnant shocks, which plays an important role in the efficiency of cosmic-ray particle acceleration.

In this talk I will present my past studies of streaming instability problems from linear theory and numerical simulation, to the application to laboratory astrophysics experiments. The research topics include the formation of phase-space electron-hole structure in the electron-positron plasma, fire-hose-type electromagnetic streaming instabilities, and cosmic-rays driven magnetic field amplification.  Together with these ongoing projects, I will also discuss potential future approaches within this rich research field.

Introduction to Plasma-based Atomic-Layer Processes for Modern Semiconductor Device Fabrication

Professor Satoshi Hamaguchi

Center for Atomic and Molecular Technologies, Graduate School of Engineering, Osaka University, Osaka, Japan

2018/11/29 14:10 R.48218 –2nd floor of Composite Building 

As the sizes of semiconductor devices continue to diminish and are now approaching atomic scales, the downsizing of transistors following Moore’s law is bound to end in the near future. However, the continuing market demand for higher performance and lower energy consumption of large-scale integrated (LSI) circuits has driven invention of new device technologies such as three-dimensional (3D) device structures and devices based on non-silicon materials. Manufacturing of these non-conventional devices also poses new challenges for processing technologies. One of the latest processing technologies that are considered crucial in modern semiconductor technologies is Atomic-Layer Processes (ALPs), which typically refers to Atomic Layer Deposition (ALD) and Atomic Layer Etching (ALE). In these processes, deposition or etching processes take place layer by layer in atomic sclae. For example, in plasma-based ALE of SiO2 films, deposition of a few-angstrom deep fluorocarbon (FC) layer on a SiO2 film and a subsequent application of low-energy Ar+ ions to the fluorocarbon-deposited SiO2 film causes sub-mono-layer etching of the SiO2 surface. By repeating these steps, a layer-by-layer etching of SiO2 can be achieved selectively over other materials such as Si. Despite their low throughput, ALPs are now widely welcomed in industry as they typically allow highly uniform processes over a large area with atomic-scale accuracy. In this lecture, after a brief introduction of plasma processing in general, basics of ALPs will be discussed and latest research results for experimental and computational studies on ALE processes will be presented.

前進水波槽實驗分析與模擬應用

Dr. Feng-Cheng Li

Taiwan Ocean Research Institute (TORI), NARL

2018/11/15 14:10 R.48218 –2nd floor of Composite Building 

An Introduction to Deep Learning Network Models and their Applications

Professor Pau-Choo Chung

Institute of Computer and Communication Engineering, NCKU

2018/11/1 14:10 R.48218 –2nd floor of Composite Building 

Deep learning neural networks have been the main focus in recent researches and applications. In this talk, we will give an introduction of the concept of neural networks and the deep learning models. A brief overview of the development of deep learning network models for image analysis and other applications will be provided. Some mechanisms in achieving successful training will also be discussed.