Embedded Files
Review Scope
Review Scope
The Neutral Beam ARR supports PPPL requests to commission and operate the existing NSTX-U Neutral Beam System. Under this request, the Neutral Beams will operate in a configuration referred to as High Voltage Conditioning.
The Neutral Beam ARR supports PPPL requests to commission and operate the existing NSTX-U Neutral Beam System. Under this request, the Neutral Beams will operate in a configuration referred to as High Voltage Conditioning.
In this mode of operations, the Neutral Beams are injected into a dedicated calorimeter.
In this mode of operations, the Neutral Beams are injected into a dedicated calorimeter.
This mode of operations requires cryogenic pumping of the neutral beam enclosures, leading to the potential for oxygen deficiency hazards. D-D fusion reactions on the surface of calorimeters and ion dumps result in direct radiation, primarily in the form of 2.45 MeV neutrons.
This mode of operations requires cryogenic pumping of the neutral beam enclosures, leading to the potential for oxygen deficiency hazards. D-D fusion reactions on the surface of calorimeters and ion dumps result in direct radiation, primarily in the form of 2.45 MeV neutrons.
The proposed sequence following this review is as follows:
The proposed sequence following this review is as follows:
1: Following closure of any recommendations from this review, the ASE will be provided to the site office for approval.
1: Following closure of any recommendations from this review, the ASE will be provided to the site office for approval.
2: Following completion of pre-starts, PPPL will request permission to commission and operate the cryogenic plant.
2: Following completion of pre-starts, PPPL will request permission to commission and operate the cryogenic plant.
The cryoplant will be started in a staged fashion, allowing retraining of the existing team and new training of recently onboarded team members. Initial single-shift operation of portions of the plant is denoted a Phase 1a in the graphic below. This will transition in a staged manned to steady-state operation in Phase 1b.
The cryoplant will be started in a staged fashion, allowing retraining of the existing team and new training of recently onboarded team members. Initial single-shift operation of portions of the plant is denoted a Phase 1a in the graphic below. This will transition in a staged manned to steady-state operation in Phase 1b.
Low Voltage Conditioning of the ion sources will take place once the beamline cryogenic systems are operable. This mode of operations does not generate a beam, and so cannot generate a radiation hazard.
Low Voltage Conditioning of the ion sources will take place once the beamline cryogenic systems are operable. This mode of operations does not generate a beam, and so cannot generate a radiation hazard.
3: Finally, PPPL will request permission to initiate High Voltage Conditioning of the neutral beams.
3: Finally, PPPL will request permission to initiate High Voltage Conditioning of the neutral beams.
This operations mode will generate the radiation hazard.
This operations mode will generate the radiation hazard.
Formation of a tokamak plasma is NOT required for High Voltage Conditioning. Commissioning and Operations of full facility, including generation of plasma, will be addressed at the future Plasma ARR.
Formation of a tokamak plasma is NOT required for High Voltage Conditioning. Commissioning and Operations of full facility, including generation of plasma, will be addressed at the future Plasma ARR.
Charge Questions
Charge Questions
NB ARR Planning Spreadsheet - Agenda - 3:19:25.pdfCharge Question Cross Walk
Charge Question Cross Walk
Neutral Beam ARR Charge Question Cross Walk - 5:20:25.pdfSelf-Reported Pre-Starts
Self-Reported Pre-Starts
Updated 6/2/25: Fix Spelling Errors
NB ARR Planning Spreadsheet - Proposed Pre-Starts - 6:2:25.pdfPage updated
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