Log entry time 23:44:51 on November 2,2005

Entry number 158896

Followups:

keyword=P0 Scan Left Arm, counting mode

Scan of momentum setting on L-arm, with methods and goals
similar to R-arm scan (halog 158255). We might prefer using
the L-arm with an altered P0 for awhile, for reasons I don't
want to go into now.

Prior to this I did a long spot++ type run 2966 and observed
that cavities looked good.

22:20 Switch to counting mode. Did the checklist.
HV: det1=1950, det2=1950, det3=1900, det4=1900

Start with an ordinary Q² run 2967.
Run 2967 had 100K events (someone had set the event limit in
runcontrol).
Repeat Qsq: run 2968. 636K events.

After this, I adjusted PS factors to accentuate L-arm a bit.

Run .... delta-P0 .... P0 .... I_sept

2968 ... 0 MeV ... 3123.4 ... 323.6
2969 ... -3 MeV .. 3120.4 ... 323.3
2970 ... +2 MeV .. 3125.4 ... 323.8
2971 ... +6 MeV .. 3129.4 ... 324.2
2972 ... +10 MeV .. 3133.4 .. 324.6

Analysis of counting mode data
T4 = trig 4 rate, u10 = bcm (x10 gain).
det1/det2 = ratio of rates

Run .... dP .... T4/u10 .... det1/det2
............... (relative)

2968 ... 0 ....... 1.0 ..... 0.342
2969 .. -3 MeV ... 1.01 .... 0.476
2970 .. +2 MeV ... 0.99 .... 0.270
2971 .. +6 MeV ... 0.97 .... 0.146
2972 .. +10 MeV .. 0.93 .... 0.057

So, going from 0 to 10 MeV the overall rate in T4 dropped 7 %
and the ratio of det1/det2 plummeted.

23:35 Switched back to HAPPEX DAQ. Did the checklist.
We'll do the reverse scan with HAPPEX DAQ.
Kent is here and he wants to drive. See his halog (later).

User name R. Michaels

Log entry time 23:44:51 on November 2,2005

Entry number 158896

Followups: