[Bonuslist] [Revised Logentry] Hall B RC Daily Report

[narbe at jlab.org]

Logentry Text:
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Overnight, brought in beam to tagger and then FC. It was difficult to center beam on target due to BPMS https://logbooks.jlab.org/entry/3819226

05:00 After the target scan using 2c24A, Stepan suggested to use x=-0.1 and y=-+1.0 (mm) as nominal position to run for now until BPM 2H01 is fixed.

05:55 Had some lifetime issue on DAQ (couldn't see that nor trigger rate) S. Boyarinov worked on it https://logbooks.jlab.org/entry/3819273

07:31 MCC calls. After talking with BPM expert who suggested using BPM 2H00 today until tomorrow when he can calibrate 2H01. Said 2H00 is reliable as long as we run at least 7 nA for beam current. 

08:00 E. Pasyuk on expert shift, helping with B-field study. Target at about 65psi. 

09:47 E. Pasyuk discussed 70% livetime with S. Boyarinov. He found that this is coming from the micromegas (crates mvt1 and mvt2), based on the beam current (10 nA) and trigger rate (5 kHz). Will try lowering beam current to 8 nA to see how much that can help.

10:15 RICH roc (rich4) busy. Working on rebooting that and recovered it.    

10:40 Got beam current reduced to 8 nA. Lifetime went to about 80% and rate went to about 4.4 kHz.

11:18 M. Hattawy analyzes and summarizes B-field and HV scan for RTPC https://logbooks.jlab.org/entry/3819413

12:51 MCC calls to inform that they are going to set up beam for Hall C, which could take about 10 minutes or so. Beam was having a considerable amount of trips prior to the call https://logbooks.jlab.org/entry/3819458



 

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