[Hallc_running] [Revised Logentry] RC Daily Summary - 11th May '24

[ojevons at jlab.org]

Logentry Text:
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RC summary (Day 05/10/24 - Day 05/11/24)

Data taking is in full swing!

The fan study yesterday was completed at 1418h, having run with the following settings:
- LH2; 34Hz, 36Hz
- LD2; 28Hz, 39 Hz, 54 Hz

After that, at 1448h, the (S)HMS arms were moved to the KinC_x36_1 setting, and we have been continuing the run plan cycle ever since. As of 1045h today, we have just entered the second cycle, and are running at KinC_x50_0. If beam and hall operations remain smooth, we should be back at KinC_x36_1 by mid-SWING shift this evening, which we currently plan to stay at all throughout Sunday and into Monday OWL.

In terms of technical issues, a few things have happened since my last report.
- The HMS Q1 LN2 temperatures showed as being too high (https://logbooks.jlab.org/entry/4301262). This was spotted when looking at the magnet GUIs when changing kinematics, but isn't in the alarm handler. The reading is due to a faulty sensor which will be replaced during the SAD, and should be ignored until then (https://logbooks.jlab.org/entry/4301271).
- The target Loop 3 HPH power dropped to zero during SWING shift (https://logbooks.jlab.org/entry/4301452). This was fixed by the target expert, who opened the JT valve for that loop and restored the power. Please can all TO's going forward please keep an eye on the HPH power readings, especially after target changes, to make sure that this gets caught before it alarms.
- During OWL shift, the HMS Dipole interlocks failed twice. The first time was fixed by a reset (https://logbooks.jlab.org/entry/4301777, https://logbooks.jlab.org/entry/4301778, https://logbooks.jlab.org/entry/4301782), but the second was not (https://logbooks.jlab.org/entry/4301790, https://logbooks.jlab.org/entry/4301794), and was shortly joined by an error for one of the helium temperature sensors within the magnet (https://logbooks.jlab.org/entry/4301799, https://logbooks.jlab.org/entry/4301813). The Engineer On-Call was notified, and this was fixed by the end of OWL shift (https://logbooks.jlab.org/entry/4301844, https://logbooks.jlab.org/entry/4301852).
- The alarm handler reports that the HMS hodoscope HVs have lost connection to it (https://logbooks.jlab.org/entry/4301869). The HVs have been checked, and these all look alright. If this persists, an IOC reboot might be necessary, but it doesn't look like an issue at the moment.

We won't be having an RC meeting today, as we are happy with the run plan for the weekend, but we will be having one TOMORROW - same time, same place - to discuss what we want to do on Monday.

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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/4301977
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