heep settings

Replay settings for hee'p checking 02/09/06

The coincidence, LH2 elastic runs were (units are in GeV^2, GeV and deg)

Q2=0.65, LH2, Ebeam=2.038, HMS=-1.692, 25.005 SOS= +0.874, 54.90
Ebeam= 2.03724 GeV after geloss (energy loss of the beam in the target)
48865 48866 48867

Q2 = 6.2, LH2, Ebeam=5.012 HMS= +4.116, 18.70 SOS=-1.7227, 50.00
Ebeam= 5.01122 GeV after geloss
49520 49521 49522 49524 49528 49529 49530 49532 49533 49534 49535 49536 49537

Q2=7.54, LH2, Ebeam=5.766 HMS=+4.867, 16.19 SOS=-1.6868, 51.61
Ebeam= 5.76551 GeV after geloss
52394 52395 52396 52397 52398 52399 52401 52402 52403 52411 52412 52413 52414 52415 52416

Q2=4.56, LH2, Ebeam=4.021, HMS=+3.232, 22.15 SOS=-1.588, 50.00
Ebeam= 4.02022 GeV after geloss
49874 49875 49876 49877

The following settings were used during replay of these runs:

Default matrix elements were used in the HMS and SOS
Chungchen's SOS angles and ytar corrections were used
HMS and SOS satcorr was applied

genable_hms_satcorr = 2000
genable_sos_satcorr = 1

The HMS and SOS field correction were turned off

A short description of satcorr and field correction can be found here

Various offsets in sosflags and hms flags that were not zero were set to zero (NB - see impotant correction to this method here)

s_oopcentral_offset = 0.00
htheta_offset = 0.
hphi_offset = 0.
hpcentral_offset = 0.
h_oopcentral_offset = 0.00

Here is the output from replay of run 49874. Normally offsets are printed out if they exist. This output shows that there are no offsets in this replay.

BPM offsets were assumed to be small. The best results using the BPM calibrations used for the optics show that the vertical beam position (Beamy) was within +-0.02cm for almost all heep runs. The horizontal beam position (Beamx) does not affect the hee'p analysis.

Run Beamx (cm) Beamy (cm)
48865 -0.000184877 -9.15923E-05
48866 -0.000184877 -9.15923E-05
48867 -0.000184877 -9.15923E-05
49520 0.123732 0.0241972
49521 0.133146 0.0231882
49522 0.133067 0.01536
49524 0.128209 0.00947536
49528 0.134725 0.0130521
49529 0.127062 0.0261141
49530 0.127737 0.031454
49532 0.134173 0.0221897
49533 0.133801 0.0227689
49534 0.137517 0.0255475
49535 0.135579 0.0267726
49536 0.138439 0.00146866
49537 0.142189 -0.0119376
49874 0.136512 -0.0236355
49875 0.131982 -0.0271745
49876 0.125514 -0.0277513
49877 0.116381 -0.0226587
52394 -0.0156985 -0.0158343
52395 -0.0120903 -0.022394
52396 -0.0140187 -0.0244912
52397 -0.0179444 -0.0171729
52398 -0.0151686 -0.0196085
52399 -0.0109531 -0.0227684
52401 -0.0208362 -0.0185154
52402 -0.0140024 -0.018941
52403 -0.0200738 -0.018255
52411 0.0223387 -0.0125718
52412 0.0171738 -0.0137909
52413 0.00351688 -0.0135449
52414 0.00390455 -0.0141624
52415 -0.0010519 -0.00708426
52416 0.00188076 -0.0130898