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User name V. Sulkosky
Log entry time 19:02:42 on February 09, 2009
Entry number 260047
This entry is a followup to: 260010
keyword=Re: L1A Signal at left HRS TS
Jack and I looked at the L1A signal coming from the BigBite weldment on a
RG-8 cable. The signal was fairly distorted such as Bob and I saw
yesterday afternoon while switching to 1-DAQ mode. The signal at the
BigBite weldment looked fine. Jack was concerned about the crimping of the
RG-8, so we checked the reflection from the RG-8 cables. They
termination appears to be fine. If the problem returns, which only
appears to happen during accesses, we will replace the RG-8 cable.
In the process of doing these checks the signal coming to the left HRS
TS cleaned up. Prior to this, Jack and I had checked the connector
upstairs and was unable to change the distortion in the signal. The
problem appears to have originated at the BigBite weldment patch panel.
When Jack applied pressure to the connection downstairs, I could see the
distortion come back. For now we left the cable as is.
Prior to leaving the hall, I took a couple of runs 1187 and 1188.
Figure 1 shows the correlations between Raster BPM signals between the
copy in BigBite and the left HRS and the difference between the helicity
from the ADC and TIR. These plots show the behavior that we expect to
A copy of this log entry has been emailed to: rom,moffit,kalyan,brads,segal
Correlation Check for 1188