Hi,
I am currently investigating a possible correlation between
the target magnetic field and the SFT magnet. For this I need
your help to collect some statistics and want to ask the shift
crews on each shift on Tuesday to make a sft-scan at the
beginning of the shift after cycling of the target holding field
magnets. The proceedure is the following:
0) ... Stop the run.
1) Call ccr and ask them to cycle the target holding field
magnets. Shannon had sent a mail about what to do that
is posted in ccr.
2) After cycling is finished, go to dblast10 (the ABS computer
to the right) and look for the third workspace from the left.
There is a xterm on the left screen with the prompt
'abs@dblast10 ~/ABSsoft/SCANS>'. Type 'scan_sft.sh <return>'.
Wait for the scan to finish - about 35min later xterm will
accept commands again.
3) Go to the ABS webpage:
http://blast.lns.mit.edu/targets/abs_web/index.php?name=ops_RFT-Scans
and look for last SFT35 scan. It should be listed at the bottom
of the page with the time stamp of the start of the scan. Click
on 'SFT35' and look in the top left picture. See if the present
set value of 10.9 is with in the boundaries of the dip.
- If yes: continue with 5).
- If no: go to the xterm in the top left of the screen with
prompt 'ABSsoft/CYCLES>' and open the file 'd_init.inc' in
emacs. Go to paragraph '# SFT' and look for the line
'par sft_st_35 (..) # static field current'
Change the number (..) to a value close to 11.0 but within
the dip that can be seen in the plot. Typical values are
between 10.8 and 11.2. Save the file, exit emacs and execute
the script 'bak-d_init.sh' in the same directory. This will
save the new file in a log directory.
5) Continue with run. If you have changed the set value tell the
next shift what value you have set so they can compare. The
current d_init.inc files can also be found on the above web page
as a 'd_init.inc' link next to the last 'SFT35' link.
If you have any doubts then don't change anything. Continue with
running after the scan.
Many thanks,
Hauke
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