Phenix
Standard High Voltage Information Page
General:
High Voltage is supplied ot each sub-system of the PHENIX experiment by
means of LeCroy Mainframes and LeCroy High Voltage Modules. PHENIX
uses the 1458 model LeCroy Mainframes, which have Low Power (LP) and High
Power (HP) versions. The 1458 can be controlled by means of ACRNET,
ETHERNET or a RS-232 Serial connection. Each mainframe can house
up to 16 LeCroy High Voltage Modules. PHENIX will usea total of 30
mainframes, 18 of the low power type and 12 of the high power type.
There are eight models of modules that are to be used in PHENIX; four
of these modules are adaptations of other modules. Each model also
has negative and positive polarity versions. The module models used
in PHENIX are:
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1461 (none used)
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1461M006 (negative)
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1461M104 (negative)
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1461M100 (negative)
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1461M410 (positive)
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1471 (negative & positive)
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1469 (negative & positive)
LeCroy Specifications:
The specification of all of the modules and mainframes can be found here.
PHENIX Sub-system Module Requirements:
An Excel spreadsheet, listing the modules and mainframes used by each sub-system,
can be found here.
High Voltage Module Tests:
In September '98, the first operational tests of the HV modules were begun.
The modules are tested with a specially built test stand, located in 1008A.
The tests are used to verify the quality of the HV modules, and to build
a database (using Objectivity) of their performance.
Testing involves a set of six base-line tests, plus any additional
procedures which are unique to the module being tested. These base-line
tests verify that:
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Each channel can be enabled and disabled
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The Demand Voltage of each channel can be set and rest
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Each channel can be enabled and then set to have a Demand Voltage of zero (this
was added due to the discovery of some channels that could not
have a Demand Voltage this low, causing trips or invalid measurements)
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Each channel can ramped up to the sub-system's operating voltage
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Each channel has a functioning Current Trip, which can be cleared normally
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Each channel can produce stable high voltage over long periods
Each Sub-system is expected to have additional testing requirements
for the modules they use; these additional tests will be added as they
are defined.
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Phenix
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Ryan Roth (rothr@db.erau.edu)
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Last Modified: 12 October, 1998