Let me follow up on the note below by Kris in the shift report, and clarify
the nomenclature
Trigger 3 (MRS) is a triple coinc on MRSfrontslat-MRS-backslats-INEL
Trigger 6(FS) is a triple coin of Td1-h1 and Inel
In this case Inel is triple coinc of L(inel) , R(inel) and the RC
The work yesterday found some non well understodd problems in how the Inel
trigger rates were.
Switching modules and config resulted in well behaved system, with rates
similar to the pp2pp, BUT
seem to give a much more dirty signals (i.e. more background) in particular
in the MRS front trigger
We looked yesterday at track/triggers for a (development run) yesterday
afternoon, and saw
pretty back ratios.
I looked at 10,000 events from 6302
and reconstructed 1272 mrs tracks / 6100 trigger 3 == 1/5
261 ffs tracks / 800 trigger 6 == 1/3
This is not as bad as yesterday, but lower eff than previous runs which were
~ 40-50%
Based on this the 8 deg 1/4A pol is complete and we should move to the zero
field and
B-pol.
The 35 deg B-pol is already started (6303).
The goal factors until I get another chance to look at this should be
MRS (tr 3) 2.5 and FS (1.5)
------------------------------------------------------
Flemming Videbaek
Physics Department
Brookhaven National Laboratory
tlf: 631-344-4106
fax 631-344-1334
e-mail: videbaek@bnl.gov
----- Original Message -----
From: "Apache" <apache@pii3.brahms.bnl.gov>
To: <brahms-l@bnl.gov>; <olchansk@bnl.gov>; <videbaek@bnl.gov>
Sent: Sunday, January 06, 2002 12:04 AM
Subject: Shift report 20020106 16:00-24:00
>
> ------------------------------------------------------------
> Date: Sun Jan 6 00:04:21 2002, Shift: 16:00-24:00
> Supervisor: KH, with:
> Log book#12 pages 3 - 6
>
> Shift Summary:
> ------------------------------------------------------------
> No real beam until 22:20
>
> Had a 15 minute access which I used to try to resurrect
> the BFS inner camera. I did not succeed.
>
> Just after beam was stored and cogged while going through
> the checklist for the first run after having beam, I
> discovered that D2 had tripped. Called MCR. They came
> and fixed the problem.
>
> One real run.
> 6302 24k trigger 6 events at shift end.
>
> IMPORTANT NOTE CONCERNING TRIG 6 PROGRESS TOWARD RUN
> PLAN GOALS:
>
> Because we have less tracks per event with current timing, trigger 6
events for runs later than 6290 need to be
> counted with less weight. Therefore, in calculating how far we are
towards a goal, we use the following until
> further notice: (see logbook 12, page 4)
>
> Goal Trig 6(MRS) = Trig 6(MRS)(Total to run 6289) + Trig 6(MRS)/5
> Goal Trig 6(FS) = Trig 6(FS) (Total to run 6289) + Trig 6(FS)/2
>
> Another way of looking at that is that the remaining
> trig 6s after run 6289 need to be 5 (MRS) and 2(FS)
> times the goal in the run plan.
> ------------------------------------------------------------
>
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