[Halla_running] [New Logentry] RC Summary 09/27/2023

[jpoudel at jlab.org]

Logentry Text:
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Gordon Cates informed that target group preformed the magnetic field measurement inside the target enclosure during the maintenance day yesterday, and found no significant changes than before.

After the target group work, we closed the hall for beam permit around 6 pm. As PD mentioned before, MCC took couple of hours to recover beam after the maintenance. We got harp scans around the late swing shift yesterday, and beam recovery procedure was followed to send beam to the He3 target. We continued taking production data on polarized He3 (~40% polarization) @35uA beam current. No major issue during the OWL shift [except GEMs HV tripped and gap appeared in the occupancy plot].

In the PD meeting this morning, Jay mentioned that MCC found a solution to operate in higher power. So, he suggested MCC can try to send higher current to both halls A and C, if halls ready. During the RC meeting on Friday, we decided to go 40uA if we have polarization >35%. So I informed spokesperson regarding the increase of beam current upto 40uA. However around 09:05 am, PSS B-chain dropped BYI again and we don't have beam after that. We will ask MCC to send 40 uA when we get beam back to the hall.

accumulated corrected charge collected: 0.434 C [during owl shift today] + 0 [yesterday day+swing shift]
target polarization: 41.5% [09:17 am this morning]

We will have RC meeting at 3:30 pm today at CH conference room to discuss more. You could also join remotely using the following info:

https://jlab-org.zoomgov.com/j/1616220064
Meeting ID: 161 622 0064
Passcode: 314159



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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/4188340
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