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2016-11-07-settings

Note issue #1887

Monday 7th November, 14:00 GMT, MICE meeting room.

http://mice.iit.edu/phonebridge.html

Notes

Alan Young
Victoria Blackmore
Paolo
YingPeng
Ao
Rogers

Statistics on empty data
1. We have about 15000 events per momentum setting after Rogers cuts
2. Is that sufficient? study at ~ 0.1 MeV/c momentum bias which is about 1 % of the energy change; transverse variables have better resolution; demonstrate px/py resolutions at the 1 % level as well which is probably enough.
3. We can't check emittance change for empty data set at required precision - need about 50,000 events for that (see J.Cobb MICE Note)
4. Magnet alignment; we cant do alignment empty and apply the result to full - because the magnets have to move to do the install.
DECISION: We can live with existing empty data sets; but would be nice to have "empty" with more statistics to check for null result

Statistics required on full data
1. We didn't go into too much detail - but a "couple of days" on each setting should be sufficient. In which case we aim for about 10 settings (with some settings getting higher priority and aiming for better statistics - TBD).
2. The feeling was that the concern about emittance bias/transmission issues was sufficient that a beta/acceptance scan has higher priority than momentum scan.

==

Discussion of proposed settings...

Jaroslaw:
  • A nice setting - but how does it fit into a paper?
Rogers:
  • ACTION: Give Ao the settings shown in slides; for 7500 he can use the ones on the wiki for best acceptance
  • ACTION: Add - max beta function in the TKD region plot
  • ACTION: Check - low beta/high acceptance region for flip i.e. "cape of good hope"
  • DECISION: Flip mode looks better. We should just start in flip mode
Ao:
  • High transmission - how does this fit into a paper?
  • What emittance reduction is available?

Updated by Rogers, Chris over 6 years ago ยท 6 revisions