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Leave Arc 7 Box supply OFF
YBBS06 T14 coil temperature is trending upwards again. Based on the trend, its possible that it will take another two days to trip on high temperature.
Due to the issues with MZAAS04, beam is not possible to transport past 8S. Arc 7 is not required for beam transport as we are extracting 1st pass and 3rd pass.
Therefore we will leave Arc 7 Box supply OFF until there is an opportune time to flush the YBBS06 again. This has been discussed with DC power and CASA and they have agreed.
YBBS06 has been downgraded in SRM/HCO.
VW=-90 deg, flip right, HW=0
COMMENT ON ZAAS04 Repair
e Log entry of what was found at ZAAS04 https://logbooks.jlab.org/entry/4512335
The following cavity histories have been updated: 2L14-7
The following cavity histories have been updated:
2L14-7
Username: kerns
Date/Time: 06-16-26_14:15:54
RF Status: Good
Tuner Status: Good
Comment: Rebooted zone due to HV enable and GMES faults. Restored and recovered RF.
Special Instructions:
Maintenance Tag: Component: Other
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The following cavity histories have been updated: 2L13-8
The following cavity histories have been updated:
2L13-8
Username: kerns
Date/Time: 06-16-26_13:56:59
RF Status: Bad
Tuner Status: Bad
Comment: Jumper pulled for missing 2.5w amp and bad tuner. Bypassed and stepped off +100k
Special Instructions:
Maintenance Tag: Component: 2.5W Amp
"Removed A1 Aperture For Moller Beam Study"
2L21-4 RFCM Gone
COMMENT ON DC power work regarding RSEP8 Box Supply and associated shunts
The following cavity histories have been updated: 2L21-4
The following cavity histories have been updated:
2L21-4
Username: kerns
Date/Time: 06-16-26_13:28:58
RF Status: Good
Tuner Status: Good
Comment: RFCM replaced and RF recovered/optimized at 6.6 Mv/m.
Special Instructions:
Maintenance Tag: Component: RFCM {Removed SN: 521, Replacement SN: 264}
RF On/Off turned RF On
COMMENT ON ZAAS04 Repair
MZAAS04 downgraded in SRM
COMPLETED ZA8S03 Trouble Shoot & Hose Replacement
COMMENT ON ZA8S03 Trouble Shoot & Hose Replacement
MZAAS04 broken brackets and coil protuding
During our investigation of MZA8S03, I found that the downstream magnet, MZAAS04 had broken brackets and the kapton flaring up off the magnet (Fig. 2). MSS took a closer look and you can see the coils protruding out the top of the magnet (Fig. 1). If you look closely, it appears the beam pipe is being pushed upwards on the incoming left side and then bending back downwards on magnet exit (Fig. 3).
This magnet will be downgraded in SRM.
All magnets on the RSEP8A string are in regions 8S or downstream.










