HI,
Okay if the OPER settings were 3900 V in stead of the correct
values of 3800 V then the boxes clearly won't hold with the new resistor
chains. It would be interesting I suppose to know how many boxes did
manage to hold at 3900 but not for data taking.
To set the OPER voltages follow my earlier procedure but first dump
the beam, tell CCR not to inject and set the HV to OPER mode. Then go
through everything setting the DV OPER voltages for the WC to 3800 and then
save it as before but to the OPER settings.
I can be reached at 905-737-5269 today but will be back at Bates
tomorrow evening in any case.
--On Sunday, June 22, 2003 11:27 AM -0400 Adam DeGrush <degrush@MIT.EDU>
wrote:
> 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
>
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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