Experimental Physics and
Industrial Control System

"J. Frederick Bartlett ([email protected])" <[email protected]> · Wed, 16 Jun 1999 15:59:43 CDT

> 
> Hi all,
> 
> I'm in the collaboration of PHEINX at BNL-RHIC
> and wondering if there's anybody who are using
> Cockroft-Walton High Voltage generator with 
> EIPCS.
> If so please reply for this e-mail and let me know 
> about your devSup for Crockroft-Walton HV.
> 
> Best regards,
> Kunio
> 
> e-mail :  [email protected]

Kunio,

  When you talk about a Cockroft-Walton high voltage generator, I am
unsure of the scale of that device. For large Cockroft-Walton
generators, like those used to accelerate charged particles for nuclear
experiments, I can offer no help.  On the other hand, if you mean a
small Cockroft-Walton generator used to supply high voltage to
photomultiplier tubes, drift chambers, and other detectors used in
particle physics experiments, I can, perhaps, be of some assistance.

  In the early 90's the D0 experiment at Fermilab designed a
VME-based, triple-width, module which has eight high-voltage
channels. Six of those modules can be placed in a modified VME crate
to supply a total of 48 channels of high voltage from a single
crate. Each channel on the module has a replaceable pod (these are the
Cockroft-Walton generators) which supplies the high voltage and which
contains the analog feedback control circuitry. The module mother board
contains all of the digital control circuitry. Currently there are
about eleven different pod types which supply various voltage and
current ranges. This system is now supplied commercially by Bi-Ra
Systems and is designated Model VME 4877PS.

  I have just completed the first version of EPICS record and device
support to manage the VME 4877PS (ramping, trip control, etc.)  and we
are currently commissioning the muon sub-detector at D0 using EPICS
with these records. If you are interested, you may contact me at
[email protected]. I gave some of the details of the EPICS
record/device support in a talk titled "D0 Extensions to EPICS" at the
EPICS Collaboration meeting at SLAC in May. You may view the slides
from this talk at:

	http://d0server1.fnal.gov/WWW/Bartlett/EpicsWK99/EpicsWk99Ext.pdf

						Fritz

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System