- Flip mode runs: MICE_User_Run_2016_05-v4_hack.xls
- Simulated performance - 2016-05: 2017-01-25_2016-05-settings.pdf
- Effect of Al windows on empty channel: 2017-01-25_al-window.pdf
- Post-hoc; quality of match 2017-05-19_2016-05-phase-space.pdf
- the lH2 is not ready, and
- the trackers are okay
we have an opportunity to take more solid absorber data.
I think we have to make a decision, as to whether we:1. run LiH data; showing emittance evolution with 200 and 240 MeV/c
in flip mode
- we get a few more data points; I note that we have 200 and 240
MeV/c data in solenoid mode; this would give us comparable data in
absorber and full absorber in flip mode
- we validate the existing data; we can show the difference between absorber in and absorber out, strengthening the existing data set. I guess there is a risk that colleagues tell us "you never checked the 'null hypothesis'"
- we potentially get measurements in emittance exchange regime
I would appreciate thoughts. We could have a phone call at 15:00 BST
tomorrow (the usual MICE analysis slot) - this is coincident with the
16:00 coffee break at IPAC.
My feeling is:
- (1) is lower priority. It doesn't really give us much - we have detailed dE/dx measurements and scattering measurements at these momenta, and the performance won't be terribly impressive.
- (2) strengthens our existing dataset; mitigates risk
- (3) is likely to lead to another publication.
- it is important for us to run empty absorber; see the change of phase space distribution provided directly by the absorber
- do we have sufficient data with the solid absorber data that we have a strong cooling signal
- we could work on improved matching? could improve momentum scale; could improve alpha
- Preference - try the wedge? Question how much data we can get in the time available?
- Note absorber changeover is 5-10 days; do we want to try the LiH first?
- Wedge has never had fit test; but geometry is same as LiH disk; could take longer than LiH
- One setting is probably all they need; use same magnet settings for emittance exchange and reverse emittance exchange
- 200 and 240 MeV/c settings would be interesting to finish the momentum scan in flip mode
- Would prefer to attempt to improve matching and redo data at 140 with LiH
- Concerned that phase space has a hole in the region of interest
- Aluminium drowns the effect a bit - significant but not dominant
- Wedge continues to be interesting
- Doing "no absorber" would be a good thing, but probably not the crucial thing; "empty absorber" would be acceptable
- 200 and 240 MeV/c settings not terribly interesting
- Would like to do LiH at 140 MeV/c with better matching
- Jaroslaw suspects the current matching leaves voids in the phase space
- Need more information:
- How long to do the absorber changeover?
- How sensitive is the issue of removing the lH2 absorber?
- Do we really have holes in the phase space that better matching can address?
- Post-hoc; effect of 2017-05-19_2016-05-phase-space.pdf ... no