I have three issues I would like to discuss:-
1. Do we basically agree on the plan, i.e.:At p = 140 MeV/c
- beta = 200 mm
- beta = 400 mm
- beta = 800 mm
- beta = 800 mm (approx smallest available)
- beta ~ 1100 mm (approx smallest available)
2. Should we choose Ao's setting optimised for "unmatched beam" or "matched beam" for the beta = 200 mm setting at 140 MeV/c
- If we use unmatched beam,
- If we use matched beam setting, we have to do beam sampling
3. Is there a better 200 MeV/c setting?
I showed following slides at the optics session yesterday:
I have done some more simulation runs overnight, some died due to lack of disk space (50k muons per job). I will try to get some plots together for later on.
Physics shift log from 1.2 Physics_shift_2016-12-03
Discussion on point 1
No conclusion on which beta functions to choose.
Agree that we have low focussing, intermediate focussing and high focussing for 140 MeV/c
- Note need to check on required running time; agree 100k good muons per momentum/emittance and cooling channel setting
- Good muon i.e. within TOF cuts is defined as making it to TKD; within +/- 5 MeV/c of the momentum
- That tells us how many settings we get. And then that informs what runs we plan to.
Long discussion on point 2
Ao - we should take unmatched beam data with unmatched lattice; this gives us a measure of emittance reduction across the absorber with the best performing lattice
Jaroslaw - we should take matched beam data with matched lattice; this gives us an easier analysis for the higher beta function data; we can sample the lower beta function data; we can compare more easily to the solenoid data
- Challenge to Ao - can we get emittance change across TKU to TKD using unmatched beam
Discussion on point 3 - suspended until next time
Jaroslaw: look at improved optics for 140 MeV/c
Ao: look at required running time to get 100k good muons
Ao: can we get emittance change across TKU to TKD using unmatched beam
Rogers: tidy up plots and run any new optics solutions
Rogers: do the trims in SSU