Friday 3rd July 2015

Post date: Jul 3, 2015 8:14:48 AM

We continued measuring the tune at 700A but brought proceedings to a close just after lunch owing to an issue with the linac. Instead we had a meeting to discuss results obtained over the last couple of days covering adiabatic transition to flattop, constant bucket area, tune measurements at 700A and 900A, a look again at dispersion measurements at the foil and future plans.

Attempts to upload presentations here have run foul of the storage quota for this site. Instead I have just uploaded a couple of figures - in one the effect on the monitor data when the adiabatic transition to flattop can be seen. The transition starting at 10ms, is increased in duration from 0.1ms to 10ms (compare_transitions.png). In the other, following an analysis that needs double checking, one can see the averaged signal amplitude between 15ms and 20ms as a function of the change in bucket area (ba_results_volts.png). A clear trend can be seen once the signal is normalised using S7 to remove the effect of fluctuations in the injected beam. However, the maximum in transmission occurs at a bucket area change ratio somewhat greater than unity. It was pointed out that the actual synchronous phase may vary with voltage, causing the bucket area to differ from the predicted value.