The TRD High Voltage Distribution System Athens University P' Mantzaridis, A' Markouizos, P' Mitseas

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The TRD High Voltage Distribution SystemAthens
University P. Mantzaridis, A. Markouizos, P.
Mitseas, S. Potirakis, M. Tsilis, M. Vassiliou
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Outline

Introduction HVDS SpecificationsPrototy
pe HVDS Installed at P2 HVDS Pictures Block
diagramHVDS Architecture CAN Commands List
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TRD
540 individual modules18 azimuthal
sectors-supermodulesEach supermodule contains
5 detector stacks of 6 module layers each
Introduction
ALICE TRD
HVDS Description

• A Master/Slave power supply distribution system
  has been designed in order to provide the
  required anode and drift voltage to the ALICE TRD
  readout chambers.

• The system will be used to switch on and off,
  monitor (on the nA level), protect, and regulate
  (leverage of 1000 Volts) from a common ceiling
  voltage.

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HVDS Specifications

Anode System Dynamical range 900 1900
V Max. Output current 6.3 uA Drift
System Dynamical range 1450 2500 V Max.
Output current 270 uA Both Systems Output
Channels 30 installed (540) ramp-up
rate 1-30 V/s ramp-down rate 1-100 V/s volt
age stability DV lt 50 mV
/24h Overcurrent and short circuit protection
for HV output (software control), response
time lt 50 ms
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Prototype HVDS Installed at P2


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Prototype HVDS Installed at P2


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Electrical Power Safety Measures
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HVDS Card Image



Edw na mpei fwto tis pisw pleuras
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HVDS Block diagram


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• MAIN
  COMPONETS
• Master Voltage where a nominal ceiling voltage is
  provided to the Slave system
• Reed Relay to switch on-off the power to a single
  chamber
• LOW VOLTAGE SITE COMPONENTS
• Shunt Regulator (H.V transistor)
• Adder amplifier, Error amplifier and a switching
  off transistor!
• High Accuracy Voltage Divider(500MOhm)
• 24 bit 6 S?ADC for measuring the output voltage
• Microcontroller
• Auxiliary power supply
• HIGH VOLTAGE SITE COMPONENTS
• Current Sensing Resistor
• High precision Ultra Low noise and input current
  amplifiers
• Single 24 bit S?ADC 3in3out Optoisolators
• Auxiliary power supply per channel

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HVDS Architecture

• Architecture Similar to ALICE TRD layout

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