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VIPAA02 has been enabled in alarm handler
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COMPLETED check feasibility of 550 MeV/linac with shunt resistor plates
Per Doug Higinbotham, the A-rated experiments planned do not have a lot of dynamic range so 475 MeV/linac and 550 MeV/linac will be needed. Four arcs will need to have shunt resistors shorted: 2, 3, 7 and 8.
This should still be better than we experienced with every dipole on a different hysteresis loop at 345 MeV/linac
RAR for Beam Transport Issues March 27, 2026 through May 2, 2026
https://jlabdoc.jlab.org/docushare/dsweb/Get/Document-309129/26-045.pdf
Box Supplies Were Turned Off
The following box supplies were TURNED OFF by version 2-16 of the Box Supply Cycling Script:
ARC1A Ramp Rate = 8.140 A/s
ARC2A Ramp Rate = 7.259 A/s
ARC3A Ramp Rate = 10.364 A/s
ARC4A Ramp Rate = 11.545 A/s
ARC5A Ramp Rate = 10.556 A/s
ARC6A Ramp Rate = 9.661 A/s
ARC7A Ramp Rate = 10.805 A/s
ARC8A Ramp Rate = 0.000 A/s
ARC9A Ramp Rate = 0.000 A/s
ARCAA Ramp Rate = 12.553 A/s
LAM1C Ramp Rate = 8.649 A/s
LAM3C Ramp Rate = 0.000 A/s
RSEP8A Ramp Rate = 11.250 A/s
RSEP9A Ramp Rate = 9.424 A/s
XSEP2T Ramp Rate = 5.524 A/s
XSEP4T Ramp Rate = 4.871 A/s
XSEP6T Ramp Rate = 0.000 A/s
XSE
COMMENT ON check feasibility of 550 MeV/linac with shunt resistor plates
https://logbooks.jlab.org/entry/4543443 475 MeV
https://logbooks.jlab.org/entry/4543451 500 MeV
https://logbooks.jlab.org/entry/4543437 550 MeV
https://logbooks.jlab.org/entry/4543455 605 MeV
https://logbooks.jlab.org/entry/4543457 660 MeV only 8T01 has an issue, so if fourth pass isn't needed, no resistors need be changed
Autolog restore
Check feasibility of 660 MeV/linac with shunt resistor plates
Autolog restore
Check feasibility of 605 MeV/linac with shunt resistor plates
Loaded 605 MeV/linac settings
Found we were able to walk MXC7S05 down to zero then back to setpoint to eliminate mismatches.
RSEP8A bus current can be adjusted to compensate for the two shunts out of range because those are the only things it powers.
Moving on to 660 MeV/linac
COMMENT ON Tunnel Arc Magnet Flushing
This is a place holder; at this time, we are unable to clearly define what magnets will require flushing or when. Current issues are understanding what has caused the over temp. trips of arc's 5 & 9 magnets. What has to happen to remedy this situating and that remedy being implemented. When this is done, we can start to plan the extent of the magnet flushing requirements. Until then there is no point in flushing.
iocwa2yamag restored
COMPLETED YBBS06 Back Flow Clogged Conductor
Autolog restore
Check feasibility of 500 MeV/linac with shunt resistor plates
BSList 120394
Downloaded 500 MeV setpoints
Cycled box supplies
The same shunts are out of range or mismatching as for the 475 MeV setpoints, with exception of Arc 2, which only has MXK2S05 out of range
Test owner recommends we move on to 605 MeV/linac
Box Supplies Were Cycled
The following box supplies were CYCLED by version 2-16 of the Box Supply Cycling Script:
ARC1A Ramp Rate = 5.575 A/s
ARC2A Ramp Rate = 6.698 A/s
ARC3A Ramp Rate = 9.395 A/s
ARC4A Ramp Rate = 10.903 A/s
ARC5A Ramp Rate = 9.721 A/s
ARC6A Ramp Rate = 9.426 A/s
ARC7A Ramp Rate = 10.022 A/s
ARC8A Ramp Rate = 12.088 A/s
ARC9A Ramp Rate = 9.071 A/s
ARCAA Ramp Rate = 12.127 A/s
LAM1C Ramp Rate = 9.545 A/s
LAM3C Ramp Rate = 9.549 A/s
RSEP8A Ramp Rate = 10.696 A/s
RSEP9A Ramp Rate = 6.833 A/s
XSEP2T Ramp Rate = 5.641 A/s
XSEP4T Ramp Rate = 5.285 A/s
XSEP6T Ramp Rate = 9.266 A/s
XSEP8T










