Aggregator

Log Number: 4543464Logbook(s): 

• ELOG

Entry Makers: janakBody: 

This CARM seems to be alarming like this semi frequently.

Log Number: 4543461Logbook(s): 

• BTLOG
• ELOG

Body: 

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

Log Number: 4543460Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: 

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

Log Number: 4543459Logbook(s): 

• BTLOG
• ELOG

Body: 

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

Log Number: 4543458Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: saver ran from opsl01
Data from: /usr/opdata/burt/allsnap/08-17-26_08:43:49
Restored file: /tmp/08-17-26_11:01:17.snap


Backing out of BSList 120394

Log Number: 4543457Logbook(s): 

• ELOG

Entry Makers: janakBody: 

Loaded setpoints for 660 MeV/linac
MXE8T01 is still out of range.
We were able to recover Arc 7 shunts
Owner of test plan is satisfied with data collected. Backing out

Log Number: 4543456Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: saver ran from opsl01
Data from: /usr/user4/mccops/burt/download/dipoles_at_660_per_linac_no_YAs.snap
Restored file: /tmp/08-17-26_10:50:54.snap


BSList 120394 660 MeV/linac Setpoints

Log Number: 4543455Logbook(s): 

• ELOG

Entry Makers: janakBody: 

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

Log Number: 4543454Logbook(s): 

• ELOG

Body: 

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.

Log Number: 4543453Logbook(s): 

• ELOG
• SLOG

Tags: 

• Autolog

Body: restorelib 3.0.1 Target restore date was 2026-08-15 14:34:34 The output from the myRestore execution was as follows: iocwa2yamag system@2026-08-15 14:34 2(2) restored yaRegulator@2026-08-15 14:34 8(8) restored Execute: /usr/csite/certified/bin/ced2Epics -ced ced -A -i iocwa2yamag (success) PVs modified: 0 PVs modified: 0 PVs modified: 0 PVs modified: 0 PVs modified: 0 PVs modified: 0 PVs modified: 0 Procedure return status: Success

Log Number: 4543452Logbook(s): 

• ELOG

Body: 

Work has been completed.

Log Number: 4543450Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: saver ran from opsl01
Data from: /usr/user4/mccops/burt/download/dipoles_at_605_per_linac_no_YAs.snap
Restored file: /tmp/08-17-26_10:34:35.snap


605 MeV/linac test

Log Number: 4543451Logbook(s): 

• ELOG

Entry Makers: janakBody: 

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

Log Number: 4543447Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: 

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

Log Number: 4543446Logbook(s): 

• BTLOG
• ELOG

Body: 

At 475 MeV/linac, arc 2 is added to the list, so 2, 3, 7 and 8.

I have scaled the 550 MeV/linac file by 10% (605/linac) and 20% (660/linac) to explore what the minimum energy is that can be supported with shunt resistor plates.

Log Number: 4543445Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: saver ran from opsl01
Data from: /usr/user4/mccops/burt/download/dipoles_at_500_per_linac_no_YAs.snap
Restored file: /tmp/08-17-26_10:18:54.snap


BSList 120394 500 MeV

Log Number: 4543444Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: saver ran from opsl01

Saved: janak 08-17-26 10:18:35 {A:i B:1 C:5 E:1060 A=BS B=BS C=BS D=BS 0R08=0.03 0R08 dump in. Autosave prior to restore.

Log Number: 4543443Logbook(s): 

• ELOG

Entry Makers: janakBody: 

BSList 120394 continuation
Loaded dipoles_at_475_per_linac.snap or dipoles_at_550_per_linac_no_YAs.snap
Cycled box supplies
Arc 2, 3, 7 and 8 all have multiple shunts out of range.
Specifically Arc 2 shunts are out of range for 475 MeV which were fine for 550 MeV
Test plan owner recommended we move on to 500 MeV

Log Number: 4543442Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: 

The following box supplies were CYCLED by version 2-16 of the Box Supply Cycling Script:
ARC1A Ramp Rate = 7.845 A/s
ARC2A Ramp Rate = 6.906 A/s
ARC3A Ramp Rate = 9.274 A/s
ARC4A Ramp Rate = 10.343 A/s
ARC5A Ramp Rate = 9.686 A/s
ARC6A Ramp Rate = 9.305 A/s
ARC7A Ramp Rate = 9.509 A/s
ARC8A Ramp Rate = 11.472 A/s
ARC9A Ramp Rate = 6.855 A/s
ARCAA Ramp Rate = 12.228 A/s
LAM1C Ramp Rate = 9.009 A/s
LAM3C Ramp Rate = 9.013 A/s
RSEP8A Ramp Rate = 10.696 A/s
RSEP9A Ramp Rate = 6.833 A/s
XSEP2T Ramp Rate = 5.678 A/s
XSEP4T Ramp Rate = 5.308 A/s
XSEP6T Ramp Rate = 8.788 A/s
XSEP8T R

Log Number: 4543439Logbook(s): 

• BTLOG
• ELOG

Body: 

At 550 MeV/linac, shunts on arcs 3, 7 and 8 could not make required current. Arc 1 box supply didn't turn on for PSS reasons (under investigation) but the percentages and spreadsheet indicates it should be fine.