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2017-03-24 straight tracks scattering requirements

240 MeV/c LiH dataset (March 2016)

Nb run 7851 has no cdb entry for end of run data, so is not included in this calculation.

runs Note 497 7727, 7733, 7737, 7738, 7741, 7775, 7776, 7790, 7794, 7795, 7796, 7805, 7808, 7809, 7813, 7814, 7816, 7817, 7818, 7819, 7844, 7845, 7847, 7848, 7849, 7851, 7852, 7853, 7854, 7855, 7856, 7858, 7859, 7860
tof1 triggers Note 497 1239827
tof2 triggers Note 497 232982
tof1_triggers CDB 1997731
tof2_triggers CDB 807646
lmc1234 CDB 35417472
time CDB 45 hrs 57 mins
measured theta_x CM47 talk 14.28 ± 0.06 ± 0.42
measured theta_y CM47 talk 14.35 ± 0.06 ± 0.5

170 MeV/c LiH dataset (March 2016)

runs Note 497 7764, 7766, 7767, 7694, 7777, 7782, 7783, 7785, 7786, 7787, 7799, 7800, 7806, 7822, 7823, 7824, 7825, 7826, 7827, 7831, 7832, 7833, 7861, 7863, 7864, 7865, 7866
tof1 triggers Note 497 1282488
tof2 triggers Note 497 174405
tof1 triggers CDB 2517617
tof2 triggers CDB 747564
lmc1234 CDB 31583315
time CDB 43 hrs 42 mins
measured theta_x CM47 talk 22.51 ± 0.24 ± 0.8
measured theta_y CM47 talk 22.5 ± 0.24 ± 0.56

Comment:

  • From approx two days of running at each setting (not including any downtime/etc), systematics errors are by far the dominant source of error.
  • Why are the stats listed in MICE Note 497 different to those arising from my "cdb lookup" script?
    • script is attached
  • One could imagine taking less data; if stats errors go as sqrt(n) then 10 hours of data at each momentum would give stats error approx equal to or better than systematic error
  • Say 4 momentum settings each of which gets 12 hours data + 30 % contingency => 60 hours of data (say 3 days of 24/7)
  • Ryan notes LiH data set was a muon beam; so we should do much better

cdb_tof_triggers_lookup.py Magnifier (2.15 KB) Rogers, Chris, 24 March 2017 11:43