Why are the WC's tripping? Are the BQM rates normal? The correct
operating mode is that the WC's are ramped down to 2000 V during injection
and then normal operating voltages for running. If a box trips during
running try lowering the operating voltage 100 V for a few fills and then
gradually (25 V steps) raise it again so long as it holds. All last week
this worked and most of the time all boxes worked and trips were very
infrequent.
Are the WC STBY settings 2000 V ?
Since we have changed the HV GUI to use the physics database this may not
have been updated. Adrian ?
To check the WC STBY voltages when not taking data:
1 - click STBY on the main HV GUI window
2 - wait for the restore in progress to finish
3 - click on the WC L button
4 - you should get a new window with MV DV and CE for each WC box
5 - click on DISPLAY button to request current reading
6 - MV and DV should be 2000 V
7 - if it is not click on SET
8 - new window should appear allowing you to set DV, TC, RUP, etc.
9 - click on DV to allow demand voltages to be set
10 - change all values to 2000 V (NOTE the cursor has to stay in
the little box as you change the value and you have to hit return each time
for the change to take affect - sorry it is EPICS)
11 - after changing all the values click SET
12 - close the setting window
13 - in the read value window clicking on DISPLAY should show the
new DV values as 2000 V if it doesn't go back to point 7 and try again
14 - once all values are set properly return to the main window and
click on the set beside the WC L button
15 - in the top left corner of the main HV window there is a button
for saving settings, click this
16 - click SAVE STBY settings (I don't think saving to database
works - Adam?) and the close window
15 - go back to point 3 and repeat for WC R
If you reboot the HV IOC or reinitialize from the database you
loose these settings and it has to be done again.
If you try to do this during auto-fill running you will run out of
time when it is in STBY and the automatic program will restore OPER values
and ruin everything.
Cheers,
Douglas
26-415 M.I.T. Tel: +1 617 258 7199
77 Massachusetts Avenue Fax: +1 617 258 5440
Cambridge, MA 02139, USA E-mail: hasell@mit.edu
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