Re: [BLAST_SHIFTS] WC tripping

From: Adam DeGrush (degrush@mit.edu)
Date: Sun Jun 22 2003 - 11:27:14 EDT


I checked the settings and the problem is most likely due to the run voltage
in the new database being set to 3900 V. I changed it to 3800 V so a reboot
should fix it.

Cheers,
Adam

Douglas Hasell wrote:

> 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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