Log entry time 08:05:46 on May28,2009

Entry number 277039

Owl shift summary: Miha Mihovilovic (SL), Eric Jensen (3rd)

===================================================================



EVENTS



00:00  Shift has started smoothly. We are taking production data

       on 3He target. Target polarization at the moment is 58.6%

       The runs that are currently running are 2833/21733.

       We are still haviong some problems that can not be resolved

       until the morning: The HV controls for the HRS-R spectrometer

       and LUMI are not working. The last SL said that we can live 

       with that and that problem will be solved in the morning. 

       LUMI is saturated but this also can wait until the morning. 



01:00  I have started new Compton run #17046. When I tried to end

       the previous one, I got message that the end of run failed.

       I have also noticed warning message saying: "ROC1 has not

       reported status for xxx s". I decided to use the "coda 

       reboot" command. The rocs came up normally. After that I 

       restarted the Coda, using the PROD_FA configuration. Now it 

       seems to be working normally again. 





01:34  We have noticed (unfortunately very late) an error message

       in the left DAQ, saying "ROC5 did not report status for xxx 

       sec". The dead time in the Datamon was also 100% and left 

       coda was not counting events. Right Coda seemed to be working 

       normally.



       We have killed the Left Coda and rebooted ROC 5. After the 

       successful reboot, we restarted coda and started new run. So 

       far it seem that it is working again. Dead times are 5% (left) 

       and 12% (right). Coda integrated rates are 2.5k ev/sec (LEFT) 

       and 1.8k ev/sec (RIGHT)  



       Problem happend during runs #2834 / #21734





01:50  The HallA alarm started beeping saying that there is a

       problem with LeCroy HV (MF2alarm). We checked the HV gui for

       the left arm and Beam line. In the left arm everything was 

       green.For the beamline the title was red but all the channels 

       were green. We didn't know where the problem was. I called 

       Alexandre and he told me to check Compton HV in more detail. 

       The problem was indeed there : channel 1 in slot 11 tripped. 

       We turned the HV back on and the alarm went away. 



       We have tried to figure out what caused the trip and when we 

       checked the beam strip charts we saw that at that point beam 

       position changed dramaticaly. We believe that this was the 

       reason. 





02:41  Did NMR frequency sweep. new polarization is 57.77%  



   



02:48  Jin called and told us that he will to (remotely) some

       labmda/4 plate calibration.



03:05  Jin called and asked me to do next NMR at 7:30am



03:18  Started new Happex run #31433



03:32  New Compton run #17048



03:50  Finished  with calibration of the reference cell pressure 

       gauges. I have vented and vacumed target 2times and in each

       state wrote down the numbers on the  gauges. In the end I put

       again 10psig of N2 into the reference cell. 







05:30  I have started new compton run #17049. Before I was able

       to do that, I had to reset Coda, because previous run did

       not end poperly. 



05:41  MCC called and told us that they need to do some test and

       will therefore take our beam away for few minutes.



05:55  We got beam back. Beam was away for 10min. 



06:53  MCC called and said that they will take beam away for

       few minutes, because they need to do some beam studies. 



06:59  Beam is back



07:37  Started new Compton run #17050.





07:43  The Hall A Alarm started beeping again. We had another Compton 

       HV trip. We have turned off and on the tripped channel 1 in

       slot 11. Now things seem to be normal again.  



07:44  Started new HAPPEX run #31434.



07:50  We made another NMR frequency sweep. The polarization is   

       58.5%.  The polarization increased from 57.8%, after Jin 

       adjusted the quarter wave plate. Bravo Jin! 



 

      

 ============================= RUNS ================================



#2833/21733: 23:40-00:18, Prod. 3He, I=11uA, N=5M/3.7M, DT=4%/12%

#2834/21734: 00:20-01:23, Prod. 3He, I=11uA, N=??M/6M, DT=4%/12%

      (ROC 5 crashed during these runs )



#2835/21735: 01:24-02:01, Prod. 3He, I=11uA, N=5M/3.8M, DT=4%/12%

#2836/21736: 02:02-02:36, Prod. 3He, I=11uA, N=5M/3.5M, DT=4%/13%

#2837/21737: 02:38-03:14, Prod. 3He, I=11uA, N=5M/3.5M, DT=5%/12%

#2838/21738: 03:16-03:50, Prod. 3He, I=11uA, N=5M/3.6M, DT=5%/12%

#2839/21739: 03:52-04:25, Prod. 3He, I=11uA, N=5M/3.7M, DT=4%/12%

#2840/21740: 04:26-04:58, Prod. 3He, I=11uA, N=5M/3.8M, DT=4%/12%



#2841/21741: 05:01-05:34, Prod. 3He, I=11uA, N=5M/3.6M, DT=5%/13%

#2842/21742: 05:36-06:21, Prod. 3He, I=11uA, N=5M/3.7M, DT=5%/12%

#2843/21743: 06:23-06:59, Prod. 3He, I=11uA, N=5M/3.7M, DT=4%/12%

#2844/21744: 07:01-07:40, Prod. 3He, I=11uA, N=5M/3.7M, DT=4%/12%

#2845/21745: 07:43-xx:xx, Prod. 3He, I=11uA, DT=4%/12%

                            (Still Running)