TOF Low Voltage and High Voltage Systems Vahe Ghazikhanian UCLA Department of Physics and Astronomy

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TOF Low Voltage and High Voltage SystemsVahe
GhazikhanianUCLA Department of Physics and
Astronomy
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Basic Low Voltage Power Requirement of TOF FEEs.

• Maximum 110 Watts/tray _at_ 4.8 Volts _at_ tray.
• Low Noise
• Periodic and Random Distortion (PARD) lt few mVRMS
  
• Floating outputs.
• Shielded power cables (optional).
• Independent supplies/tray.
• Regulation Not critical (linear regulation on
  FEE cards).
• Remotely controlled and monitored.
• Safety Interlocked and adhere to STAR/BNL
  safety.
• Rack mounted
• Relatively low cost.
• Good efficiency (not critical).

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Comparison of Power Supply choices for TOF FEE.
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Linear Regulated power supply with remote sensing
scheme for TOF LV system.
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David L. Huffman FNAL Eng. Note August 16,
2002 Doc H020816A Testing for use in MINOS
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Comparison of MRPC Noise Rates Between Wiener and
Kepco Linear supplies (March 2005 Cu-Cu on-line
data)
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TOF System Resolution from Off-Line
Analaysis Kepco Linear (red curve) vs. Wiener
(blue curve) (March 2005 Cu-Cu)
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Arrangement of Supplies in Half Height Racks.
Linear Regulated Supplies Total of 30 racks
required
Ferroresonant power supply Total of 8 racks
required
Wiener power supply Total of 3 racks required
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Low Voltage System Project Schedule.
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Kepco Ferroresonant series specs.
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Slow Control for the TOF LV system.

• Hardware microcontroller based similar to EMC
  HV system. Output voltages, currents and
  temperature for each supply are monitored.
• Software LabView based GUI.

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A Sample of LabView Graphical User Interface
Control ScreenBased on Custom RS485 master/slave
Protocol Developed at UCLA.
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Updated LabView Graphical User Interface (from
EMC HV).
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TOF High Voltage System Requirements.

• High Voltage to provide symmetric HV up to /-
  7.5 KV _at_ few uA/tray (this current takes into
  account Beam on condition scaled to RHIC upgrade
  luminosities).
• Remote programability/monitoring Voltage,
  current limits, ramping rates, voltage and
  current monitoring (10 nA resolution).
• Isolation power supply outputs must be floating.
  Furthermore, since one set of plus and minus
  outputs supply current for up to 10 trays tray
  inputs are isolated from other trauys to avoid
  interference.
• HV will be interfaced to STAR interlock system.
• Remote control software will be based on LabView
  and will be interfaced to STAR controls (logging
  and alarms).

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Choice of HV Power Supply.

• CAEN SY127 mainframe with A631 pods has been used
  to supply HV to MRPCs (some problems have been
  encountered during last two runs - failed A631
  modules).
• Each SY127 accommodates 10 A631 pods. Each A631
  pod (negative and positive output versions
  available) supplies 4 independent floating
  channels. Each output could supply up to 8 KV at
  100 uA. (One fully equipped SY127 would serve the
  entire TOF system if we use fanout distribution
  boxes)
• Distribution boxes located on the magnet will fan
  out each pair of and HV to up to 10 trays.
  These boxes will supply required isolation,
  filtering and grounding of the HV.
• Raynolds/Teledyne 22 KV cables will be used for
  HV distribution.
• Kings 1065 series 10 KV (DC tested to 25 KV) will
  be used to interface the HV to power supplies,
  distribution boxes, and the trays.
• Remote control and monitoring of the SY127 will
  be done through CAENET (PC based A1303 PCI-HS
  CAENET controller already used to control HV
  system in the past few years).

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TOF High Voltage Distribution System
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LabView GUI for SMD TCP/IP-based HV Control
Program for CAEN SY1527 Mainframe Developed by
UCLA.