25 Feb 2006

First time we have beam.
Electron trigger(T2) rates dependence to BB Total Sum(TS) threshold values was measured, based on run 2195.

Current: 5uA

Threshold (mV / MeV)	20 / 100	40 / 200	60 / 300
Rate (Hz)	1.014 *106	5.980 *104	1.830 *104

Current: 2uA

Threshold (mV / MeV)	60 / 300	80 / 400
Rate (Hz)	7430	2800

Current: 10uA

Threshold (mV / MeV)	80 / 400	100 / 500	120 / 600
Rate (Hz)	1.5 *104	6200	2700

26-27 Feb 2006

DC VME crates was changed to FastBus? crates with.

28 Feb 2006

BB HV was adjasted using elastic run 2429.

HV settings before adjastment:
/w/work3503/e02013/GEn/adaq.bk/adev/slowc/HV_BB/hv_set/bb_hv_28_02_2006.set

Hv settings after adjastment:
/w/work3503/e02013/GEn/adaq.bk/adev/slowc/HV_BB/hv_set/bb_hv_28_02_2006_adj2429.set

Adjastment factors based on run 2429:
/w/work3503/e02013/GEn/adaq.bk/adev/slowc/scripts/adj_sh_2429.dat - for Shower.
/adj_ps_l_2429.dat - for left PS.
/adj_ps_r_2429.dat - for right PS.

01 Mar 2006

Background rate calculation for different beam positions.

Run #	Target	Current (uA)	Time (sec)	Ax	Ay	Bx	By	Rate (Hz)	Rate per uA (Hz/uA)
2461	Reff cell empty	1.194	290	-0.221	-1.451	-0.352	-0.751	0.328	0.275
2462	Reff cell empty	5.217	330	-0.318	-1.599	-0.387	-0.864	1.882	0.361
2463	Reff cell empty	0.625	325	-0.274	-1.333	-1.493	0.478	0.185	0.296
2464	Reff cell empty	0.629	295	-0.240	-1.433	-1.559	-2.826	0.234	0.372
2465	Reff cell empty	0.628	305	-0.263	-1.297	0.880	-0.920	0.262	0.417
2466	Reff cell empty	0.558	300	-0.281	-1.325	0.926	0.390	0.357	0.640

02 Mar 2006

Counting rates was calculated for Vacuum, HE3 and H2 targets, both for electrond and pions.
Based on runs 2461, 2473 and 2485.

Run #	Target	Current (uA)	Time (sec)	Ax	Ay	Bx	By	Electrons rate per uA (Hz/uA)	Pions rate per uA (Hz/uA)
2461	Vacuum	1.194	290	-0.221	-1.451	-0.352	-0.751	0.275	0.436
2473	He3	1.192	1837	-0.215	-1.639	-0.347	-0.817	4.551	3.194
2485	H2	2.145	1826	-0.268	-1.659	-0.354	-0.809	4.416	2.994

03 Mar 2006

BB Scintillators time resolution study.

For scintillators 5 and 6 was ploted following distribution:

(LT₅ + RT₅)/2 - (LT₆ + RT₆)/2, where
LT - left PMT time, RT - right PMT time, numerical index - scintilator bar number.
Sigma for this distribution was 1.48ns.


Then same distribution was ploted with cut on scintillators amplitude value:
LA₅>400 && RA₅>400 && LA₆>400 && RA₆>400, where
LA - left PMT amplitude, RA - right PMT amplitude, numerical index - scintilator bar number.
Sigma for this distribution was 0.45ns.

Same calculations was made form all scintillator bars, combined into pairs:
1&2, 2&3, 3$4 ... 11&12, 12&13.

Scintillator bars	Distribution	Cuts	Sigma	Comment
1 & 2	(LT1 + RT1)/2 - (LT2 + RT2)/2	LA1>400 && RA1>400 && LA2>400 && RA2>400	0.55	Small statistic
2 & 3	(LT2 + RT2)/2 - (LT3 + RT3)/2	LA2>400 && RA2>400 && LA3>400 && RA3>400	0.79	Small statistic
3 & 4	(LT3 + RT3)/2 - (LT4 + RT4)/2	LA3>400 && RA3>400 && LA4>400 && RA4>400	0.50
4 & 5	(LT4 + RT4)/2 - (LT5 + RT5)/2	LA4>400 && RA4>400 && LA5>400 && RA5>400	0.57
5 & 6	(LT5 + RT5)/2 - (LT6 + RT6)/2	LA5>400 && RA5>400 && LA6>400 && RA6>400	0.45
6 & 7	(LT6 + RT6)/2 - (LT7 + RT7)/2	LA6>400 && RA6>400 && LA7>400 && RA7>400	0.51
7 & 8	(LT7 + RT7)/2 - (LT8 + RT8)/2	LA7>400 && RA7>400 && LA8>400 && RA8>400	0.66
8 & 9	(LT8 + RT8)/2 - (LT9 + RT9)/2	LA8>400 && RA8>400 && LA9>400 && RA9>400	0.62
9 & 10	(LT9 + RT9)/2 - (LT10 + RT10)/2	LA9>400 && RA9>400 && LA10>400 && RA10>400	0.62
10 & 11	(LT10 + RT10)/2 - (LT11 + RT11)/2	LA10>400 && RA10>400 && LA11>400 && RA11>400	0.49
11 & 12	(LT11 + RT11)/2 - (LT12 + RT12)/2	LA11>400 && RA11>400 && LA12>400 && RA12>400	0.44
12 & 13	(LT12 + RT12)/2 - (LT13 + RT13)/2	LA12>400 && RA12>400 && LA13>400 && RA13>400	0.50

04 Mar 2006