Main INDEX
Monthly INDEX
PREV
NEXT
Make New Entry,
Make Followup Entry
User name A. Deur
Log entry time 15:59:08 on January19,2009
Entry number 256824
keyword=Beam summary
Starting shift with run 5320. Everything looks normal except deadtime is a bit high (~17%). Current is 13.96 uA and beam position is withing specs. We notified the expert about it. The beam spot size looks good and compton rates are very good.
Expert said the Cerenkov was turned on, so ~17% as a standard new deadtime is fine.
8:53 stop run 5320. Started run 5321.
9:56 stop run 5321, started 5322.
11:00 stop run 5322, started run 5323.
12:05 stop run 5323, stop happex run 30659, started runs 30660 and 5324.
13:17 Stop run 5324. Start run 5325.
14:19 stop run 5325, started run 5326 but DAQ crashed. run 5326 is junk.
DAQ crash: Run 5326 started normaly but did not record any events. The deadtime was 100%. We tried several times to stop the run but the daq did not respond. We kill coda with kcoda and restarted it. The ROC then started to reboot by themselves. After that, the DAQ behaved normaly.
14:40 started run 5327.
15:47. Ended run 5327, ended happex run 30660 (B. Moffit wanted to run happex daq with a new config. inluding the pvdis crate).
15:48. Started runs 30661 and 5328.