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ID Date Author Type Category Subject
  4   06 Nov 2019 00:33 Yi WangProcedure/OperationCooling Systemfast re-circulation

Start at 09:35 am, open dewar liquid level 40/120

Stop at 08:20 pm, for the evening data taking

  3   05 Nov 2019 10:56 Yi WangProcedure/OperationCooling Systemfast re-circulation

Nov 04  in the morning, start using heat gun to blow the liquid argon in the open dewar, in order to rise the pressure difference between the TPC and the condenser.

Nov 04 fast circulating for 7 hours, pressure difference ~90 mbar

Nov 05 fast circluating for 10 hours, pressure difference ~90 mbar

 

  2   02 Nov 2019 11:44 Alex KishProcedure/OperationCooling SystemForcing recirculation

Argon refills of the open bath are suspended in order to increase the deltaP between the TPC and the recirculation vessel, in order to force gas recirculation through the oxygen-sorption filter. The goal is to see S2 signal.

Currently the pressure is stable, fluctuations seezed over night. DeltaP very low, ~5 mbar.

Up to now (last check evening of November 1) sporadic noise with high amplitude and frequency ~50kHz was suddenly appearing when the FEBs are turned on, forcing to stop the data acquisiton.

Gas pocket: ON

Fields: ON

SiPMs: OFF

FEBs: OFF

DAQ: idle

LAr level in the open bath: >1/2

Attachment 1: dcs_191102_1941.png
dcs_191102_1941.png
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