[BLAST_SHIFTS] Shift summary 03/10/2004 F (20-24)

From: Electronic Log Book (elog@blast05.lns.mit.edu)
Date: Wed Mar 10 2004 - 23:24:14 EST


Operators: tancredi tancredi tancredi

Continuing production on pol-D with the new collimator/beam tune/slit position
Did a quick check of yields from e,e'd for runs before & after

before : Runs 5453 -5460 : eL 219 events eR 213 events : Q = 543 C : <dt> 35%
after : Runs 5487-5491 : eL=212 events eR=200 events : Q = 600 C : <dt> 5%

where eL,eR is the number of ed events for electron on Left, Right. Cuts used:
e-tof<4, d-tof>10, vertex<15, e-cerenkov, Beta-d2 < 0.3 . For the above runs analysis the normalized yields are (0.81 +- 0.04 )/C vs (0.70+-0.04)/C

This is close -not identical= *but* the ABS was also rebooted after the new
collimator went in. Maybe should do quick unpol ("high flow") to check vs
previous unpol number. But it is realistic to say that we probably get all the gas events

Also, today checked CC analogue offsets, seem fine.

BQM and Wch rates were good, meaning similar to this morning:
T/L/B/R = 60/25/37/15 and Wch-L / Wch-R = 50/30

However, at least one "bad" fill occured were WCh rates went over 100, but
came back somewhere middle of the fill. Sometimes there are BQM spikes.
Please read note abotu R24 trips. Life was simple during my shift.



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