[Hallc_running] [New Logentry] RC Update 11/27/2022

bduran at jlab.org bduran at jlab.org
Sun Nov 27 10:00:02 EST 2022


Logentry Text:
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Yesterday hall was down between 6:30 and 10:30 in the morning due to the unexpected drop of the hall in restricted access when a group of safe/run boxes dropped https://logbooks.jlab.org/entry/4091561. It turned out that PSS system B, Module #11 passivation caused associated run/safe boxes to drop https://logbooks.jlab.org/entry/4091590. Power cycling the module and remote I/O PLC unit resolved the issue. With the help of SSG, Radcon and MCC we were back in beam permit around 10:30 am. 

When beam was restored to hall C around 10:30 in the morning, we resumed taking data at setting 1 of the section 4.11 of the run plan where we took data at -3.09 GeV and 35 deg in the HMS and -9.2 GeV and 11 deg in the SHMS with the S1X paddles 1-3 and S2X paddles 1-4 and SHMS pre shower blocks 1-4 OFF. A little after we started to receive beam we had about 3 hour (in total) interruption to beam due to the 2L02 vacuum issues https://logbooks.jlab.org/entry/4091621. Only around 14:30 we were able to move to setting 2; HMS momentum (-2.72 GeV) still at 35 deg, SHMS rotated to 10 deg but still at -9.2 GeV and the SHMS hodoscope and pre shower HV block configurations were restored to S1X paddles 1-5 and S2X paddles 1-6 and SHMS pre shower blocks 1-6 OFF.

We had a smooth running through swing and owl shifts. Day shift crew started setting 3 around 8:45 am; HMS momentum is set to -2.40 GeV (angle is still 35 deg). SHMS momentum and angle are unchanged (-9.2 GeV and 10 deg) but the pre shower blocks were turned back ON. We have 5 more HMS settings that we are aiming to finish some time during the swing shift if everything goes well. At that point, we will be taking Be data until Monday morning when beam will be taken away to start executing the target ladder changeover.

Have a good weekend!

Burcu

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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/4092147
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