[Hallc_running] [Revised Logentry] RC report - 02/10/2024

[voutier at jlab.org]

Logentry Text:
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  RC report - 02/10/2024
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  The Cold evening... While the data taking did progress smoothly over the 2/9 DAY shift, we experience major Cryo-events in the evening. 

  - At about 21:17 the Hall B solenoid and torus tripped for a reason which is yet unclear https://logbooks.jlab.org/entry/4250279
  - Following Hall B within a minut we lost first Q3 and then the dipole  https://logbooks.jlab.org/entry/4250244 
  - Q3 & D recovered smoothly such that we were back in production at 22:40
  - About half an hour later, the loop 1 of the cryotarget alarmed resulting from a cooling capacity loss https://logbooks.jlab.org/entry/4250291 https://logbooks.jlab.org/entry/4250274 
  - The cryo expert came in and we were back to production at 2:54 https://logbooks.jlab.org/entry/4250292
 
  Since then, the data taking is progressing quitely. Hall B is now back in operation since 8:44am. 

  Following the yesterday discussion at the RC meeting, the main trigger of the experiment is now single-arm HMS. The dead-time calculation should be simpler. It would be instructive to look at the yield evolution as function of the current.

  
  Request : please pay attention to the vernier reading when changing the spectrometer angle, some misreading have been noticed. 

  Information : the pass change for hall B is scheduled on tuesday morning and should not take more than 1h. Unless vital access, the hall will stay in beam permit.



  -----> NO 11am RC meeting today <-----


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This is a plain text email for clients that cannot display HTML.  The full logentry can be found online at https://logbooks.jlab.org/entry/4250428
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