Log entry time 01:03:05 on March 11, 2011

Entry number 351272

This entry is a followup to: 351258

Followups:

• 351334 03/11/11 19:14 nmuangma BigBite issue: The noise pattern are difference. Might be related to the way coda record data.

There were two problems with noise in MWDC.

1. The noise channels changed their location from run to run.

--> This was exist even if Larry removed his code in the crl.

--> Fixed by power off both Roc 9 & Roc 10 as we have issue in Roc 9 from times to times.

2. The noise with fixed location. especially in chamber 1 plane x1 and x1p where we can see the noise in alternate 16 channels.

--> With HV off, we clearly see only the noise. The noise exists in all plane and has on/off pattern in x1 and x1p plane. see figure.

--> If we only consider the first index of the hit.wire[0], the pattern is smooth.

The non-index hit.wire is the combination of the noise which we clearly saw with HV OFF to the actualy signal.

Figure 1

Figure 2

Figure 3