I did a quick test this morning to check the cross-talk on the L-HRS scalers and found that there is indeed one.TEST 1: unplugged T7 from LHRS scalers(at the NIM-ECL). T2 is still plugged in. In this case, T6 counts same as BB but T1 counts more than BB.
------------------------------------------------------- BIGBITE Trigger 1,2,3,4,5,6,7,8 by target and helicity state : (++) (+-) (-+) (--) trig 1 1204 1144 0 0 trig 2 967 918 0 0 trig 3 1543 1471 0 0 trig 4 876 905 0 0 trig 5 964 910 0 0 trig 6 1040 972 0 0 trig 7 109646261 109763094 0 0 trig 8 76283 76322 0 0 ------------------------------------------------------- LEFT( T7 unplugged at the NIM-ECL converter) ------------------------------------------------------- Trigger 1,2,3,4,5,6,7,8 by target and helicity state : (++) (+-) (-+) (--) trig 1 1233 1144 0 0 =>T1 counts more due to cross-talk with T2 trig 2 967 918 0 0 trig 3 1543 1471 0 0 trig 4 876 905 0 0 trig 5 964 910 0 0 trig 6 1040 972 0 0 => T6 is consistent with BB (T7 unplugged) trig 7 0 0 0 0 trig 8 76284 76319 0 0 ---------------------------------------------------------
TEST2: Plugged back T7 and unplugged T2 from LHRS. Now T6 counts more and T1 is consistent with BB.
--------------------------------------------------------- BIGBITE --------------------------------------------------------- Trigger 1,2,3,4,5,6,7,8 by target and helicity state : (++) (+-) (-+) (--) trig 1 980 974 0 0 trig 2 803 791 0 0 trig 3 1291 1301 0 0 trig 4 737 719 0 0 trig 5 799 787 0 0 trig 6 848 839 0 0 trig 7 93388169 93403063 0 0 trig 8 65222 65193 0 0 ---------------------------------------------------------- LEFT (T2 unplugged at the NIM-ECL converter) ---------------------------------------------------------- Trigger 1,2,3,4,5,6,7,8 by target and helicity state : (++) (+-) (-+) (--) trig 1 980 974 0 0 ==> T1 consistent with BB (T2 uplugged) trig 2 0 0 0 0 trig 3 1291 1301 0 0 trig 4 737 719 0 0 trig 5 799 787 0 0 trig 6 1492 1480 0 0 ==>T6 counts 70% more when T7 plugged trig 7 92312174 92278867 0 0 trig 8 66320 65193 0 0 -----------------------------------------------------------
We know BB counts right because T1 is high rate and T6 is low, which do not reflect in the above data(see TEST2 : LEFT/BB scalers). I'll work on this tomorrow during the access..most likely plug T2 and T7 on different channels far from other signals that we care about.