HV Control in the Engineering Run
General:
For the upcoming Engineering Run (ER), several of the sub-systems of PHENIX
will be using their LeCroy HV for the first time in the PEH. The LeCroy
Mainframes are currently being installed and wired. For the ER, all of the
HV will be controlled out of one single IOC; this is possible due to the
low number of modules involved. Each sub-system will be able to use MEDM
to monitor and control their HV during the ER without affecting other
sub-systems.
HV Control Guidelines
In order to coordinate the use of this IOC by the separate sub-systems,
ONCS has developed the following guiding principles:
- ONCS will maintain the EPICS database that resides on the IOC (iocondev3).
- ONCS, working from stated sub-system requirements, will configure the IOC
and set-up baseline .adl files for the sub-systems to use with the MEDM
program.
- The .adl files provided to the sub-systems will prevent access to those
HV channels belonging to other sub-systems.
- The .adl files provided will prevent access to those channels of each
module designated as not being used in the ER, so that they are not
unintentionally activated.
- ONCS will keep and maintain a set of master .adl files capable of
monitoring and controlling all HV channels within the PEH, including those
not in use.
Sub-systems Responsiblities
Each sub-system using HV during the ER needs to contact either Ryan Roth
or Chris Witzig as soon as possible to establish their HV control. The
following needs to be done:
- The baseline .adl files need to be reviewed for accuracy.
- The .adl files, once corrected, need to be copied to the sub-system
account.
- If it has not already been done, the sub-system account needs to be
configured to allow HV control.
In addition, the sub_systems may wish to develop more elaborate control
software for the ER. This may require a 'HV refresher' course; Ryan is
available to assist the sub-systems in this regard.
A Special Note: Sharing Crates
In some cases, certain sub-systems are forced to share the same HV
Mainframe. A warning is required in this case: since the HVON/HVOFF
commands affect the Mainframe as a whole, it is possible that one sub-system
can inadvertantly turn on/off the HV when the other sub-system is not perpared
for it. To guard against this, ONCS suggests that the sub-systems disable
their individual channels when not in use to prevent accidents. Also, it
would be wise to coordinate HV efforts with any sub-system with whom you
share a Mainframe.
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Phenix
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Ryan Roth (rothr@db.erau.edu)
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Last modified: 12 May, 1999