Download XXVI Workshop on Recent Developments in HEP M. Vassiliou Test

Development and Performance of the
High Voltage Distribution System
for the ALICE TRD
A. Markouizos, P. Mantzaridis, P. Mitseas,
A. Petridis, S. Potirakis, M. Tsilis, M. Vassiliou
University of Athens
HEP 2008, Ancient Olympia
Outline
1.
Introduction
2.
HVDS Overview
3.
HVDS Commissioning
4.
Performance Tests
5.

Magnetic field test

Test on the TRD-SMI / SMII
Summary
XXVI Workshop on Recent Developments in HEP
M. Vassiliou
TRD
XXVI Workshop on Recent Developments in HEP
M. Vassiliou
Introduction
ALICE TRD
540 individual modules:
18 azimuthal sectors-supermodules
Each supermodule contains:
5 detector stacks of
6 module layers each
Each module consists of:
• radiator
• drift chamber
• readout electronics
TRD
XXVI Workshop on Recent Developments in HEP
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M. Vassiliou
TRD Supermodule
XXVI Workshop on Recent Developments in HEP
M. Vassiliou
HVDS Description

A Master/Slave power supply
distribution system has been designed
and constructed in order to provide the
required anode (1.9kV) and drift
voltage (-2.5kV) to the ALICE TRD
readout chambers.

The system can switch on and
off, monitor (at the nA level), protect,
and regulate (leverage of 1000 Volts)
each channel from a common ceiling
voltage.
XXVI Workshop on Recent Developments in HEP
M. Vassiliou
HVDS Overview
High Voltage Distribution System:
Simple design
Reduced complexity
Reduced number of components
Very low current circuits:
Meet ALICE TRD requirements
Provide high resolving power (nA), fast response,
Short circuit protection
Two Enfolded Voltage stabilizing Systems:
Shunt regulator
Provides load regulation
Reduces output ripple
Software regulation
Gives long term stability
XXVI Workshop on Recent Developments in HEP
M. Vassiliou
HVDS Architecture

Architecture Similar to ALICE TRD layout
Crate 01
Module 01
Card 01
Card 02
.....
Card 05
Card
μCpu
Module 02
Channel 01
Channel 02
Channel 03
Channel 04
Channel 05
Channel 06
Module 03
DCS Board
XXVI Workshop on Recent Developments in HEP
M. Vassiliou
HVDS Specifications
Both Systems:
Output Channels
ramp-up rate
ramp-down rate
HV stability
Achieved HV stability
Ripple rejection
Current accuracy
Achieved Current accuracy
response time
180
1-30 V/s
1-100 V/s
<0.1% /24h
~0.002%/24h
~40 dB
<0.2%
~0.03%
< 50 ms
Anode System:
Dynamical range
Max. current
900 – 1900 V
7 uA
Drift System:
Dynamical range
Max. current
1450 – 2500 V
270 uA
HVD Card Block Diagram
1. Six shunt regulators
HV
INPUT
2. DACs for the regulator reference
voltage
SHUNT
REGULATOR
HV
OUTPUT
CONTROL
VOLTAGE
ADC
DAC
OPTOISOLATORS
SIGNAL
CONDITIONING
FLOATING DC
POWER
SUPPLY
CHANNEL 1/6
DIP
SWITCH
CAN BUS
INTERFACE
μC
&
CPLD
4. Six floating auxiliary power
supplies.
5. The micro-controller and the
CPLD
TEMPERATURE
SENSOR
CARD ID
3. Six measurement circuits, each
consisting of an ADC with the
appropriate signal conditioning
circuits for voltage and current
measurement.
CHANNELS
2 ... 6
6. The CAN BUS interface
(controller and line driver)
7. RS232 interface
RS232
INTERFACE
8. A digital temperature sensor
LOW VOLTAGE
POWER
SUPPLY
TRANSFORMER
9. IP Switches that set the card ID
on the CAN BUS
XXVI Workshop on Recent Developments in HEP
M. Vassiliou
Control Software: Embedded Software
Software Regulation:
HV Stability
~0.002%
/24h
Includes protections:
Temperature, Current, and Voltage
Generates alarm signals
Response Time <50ms
Performs Self Diagnostics:
Hardware Monitoring, Hardware Error Detection
2 Control Interfaces:
CAN Interface (PVSS & Final Set-up)
RS232 Interface (Development, Debugging, Tests)
XXVI Workshop on Recent Developments in HEP
M. Vassiliou
DCS: SM HV Control Panel
XXVI Workshop on Recent Developments in HEP
M. Vassiliou
DCS: HVDS Channel FSM Panel
Set:
status
voltage
max (min)_voltage
max_current
period
Monitor:
voltage
current
Open panels
ramping
alarm history
Warnings – Alarms
Local Archiving
XXVI Workshop on Recent Developments in HEP
M. Vassiliou
HVDS Commissioning I
2 Anode + 2 Drift Crates delivered
and tested at CERN:
30 Anode + 30 Drift HVD Cards
180+180 Output HV Channels
to power 6 TRD Supermodules
XXVI Workshop on Recent Developments in HEP
M. Vassiliou
HVDS Commissioning II
Each crate contains:
• 1 Backplane
• 15 HVD cards
• 1 DCS Board
 adapted on 1 DCS Auxiliary Card
• 8 Auxiliary Power Supply Cards
 provide AC power to the isolated channels of the HVDS Cards
• 4 LV Power Supplies
(Schroff PSM112 for ±12V and
PSG105 for +5V)
XXVI Workshop on Recent Developments in HEP
M. Vassiliou
HVDS Commissioning III
XXVI Workshop on Recent Developments in HEP
M. Vassiliou
HVDS Commissioning: HVD Card Image
XXVI Workshop on Recent Developments in HEP
M. Vassiliou
Performance Tests : Magnetic Field Test
• Tests performed in the MNP22 Facility
at CERN.
• HV set at -2.4 kV (Drift), 1.8 kV
(Anode)
• B increased from 0 to 220 Gauss
• Two crate configurations
• Successful over current test
XXVI Workshop on Recent Developments in HEP
M. Vassiliou
Magnetic Field Test
Results: Drift HVD @ -2.4 kV
magnet on
σ < 15 mV
XXVI Workshop on Recent Developments in HEP
magnet off
M. Vassiliou
Magnetic Field Test
Results: Anode HVD @ 1.8 kV
magnet on
σ < 15 mV
XXVI Workshop on Recent Developments in HEP
magnet off
M. Vassiliou
Test on the TRD-SM I
XXVI Workshop on Recent Developments in HEP
M. Vassiliou
Performance Tests
Long Term Voltage Stability Test
HV set at 1900 V
•ΔV (FWHM) < 30 mV
•ΔV / V < 1.6 E-5
XXVI Workshop on Recent Developments in HEP
M. Vassiliou
Test on the TRD-SM I
• 6 anode channels
• HV set at 1450 V
XXVI Workshop on Recent Developments in HEP
HVD System
M. Vassiliou
Test on the TRD-SM I
Cosmic Data took at CERN
Figure 1: Cosmics tracklets in the six layers of stack three of the
super module. The tracklets can be connected to form tracks. A
simple reconstruction (clusterization) was applied. We show a
projection of the found clusters onto the plane perpendicular to the
z-axis (beam axis).
“After finalising the assembly of the super
module, its performance was tested with
cosmics tracks. Three scintillators were
arranged so that high multiplicity cosmics
events could be recorded with a rate of about
two per minute. The drift chambers were
filled with an Ar, CO2 (15%) mixture
and high voltage was applied by a
Master/ Slave distribution system
specifically developed at the University
of Athens, Greece (drift voltage 1450V,
anode voltage 1450 V). “
C. Adler et al. “Construction of the First
ALICE TRD Super Module”,
GSI Scientific Report 2006
XXVI Workshop on Recent Developments in HEP
M. Vassiliou
Test on the TRD-SM II
• HVD system
connected with the
SM-II
• Anode voltage @
1.45 kV
Drift voltage @
-1.5 kV , -1.9 kV
• Successful
overcurrent test
XXVI Workshop on Recent Developments in HEP
M. Vassiliou
Test on the TRD-SM II
Results
σ < 15 mV
Anode HVD @ 1450 V
XXVI Workshop on Recent Developments in HEP
Drift HVD @ 1900 V
M. Vassiliou
Summary

A High Voltage Distribution System for the ALICE TRD has
been designed and constructed. Four HVDS Crates have
been delivered.

The system consists of the hardware, the embedded
software and the control software at the supervisory level.

Many tests performed at CERN verified that the system
fulfils all the specifications set by the detector designers.
XXVI Workshop on Recent Developments in HEP
M. Vassiliou
References
[1] P. Mantzaridis, A. Markouizos, P. Mitseas, A. Petridis†, S. Potirakis, M. Tsilis, M. Vassiliou,
“A High Voltage Distribution System for the ALICE Transition Radiation Detector”,
ALICE-INT-2008-006, https://edms.cern.ch/document/901555/1
[2] A. Markouizos, P. Mantzaridis, P. Mitseas, A. Petridis, S. Potirakis, M. Tsilis, M. Vassiliou,
“The ALICE TRD – HV Distribution System”, Proc. of the Workshop on the DCS for the
TRD, CERN, November 2007
[3] A. Markouizos, P. Mantzaridis, P. Mitseas, A. Petridis, S. Potirakis, M. Tsilis, M. Vassiliou,
“Performance Tests of the TRD – HVDS” ALICE DCS Workshop, CERN, October 2007,
http://indico.cern.ch/getFile.py/access?contribId=17&resId=1&materialId=slides&con
fId=21162
[4] A. Markouizos, P. Mantzaridis, P. Mitseas, A. Petridis, S. Potirakis, M. Tsilis, M. Vassiliou,
“Integration of the HV Distribution System to the First TRD Supermodule”, Proc. of the
Workshop on the DCS for the TRD, Heidelberg, January 2007.
[5] C. Adler et al. “Construction of the First ALICE TRD Super Module”, GSI Scientific Report
2006
http://www.gsi.de/informationen/wti/library/scientificreport2006/PAPERS/INSTRUM
ENTS-METHODS-39.pdf
[6] A. Petridis, S. Potirakis, M. Tsilis, M. Vassiliou, “The TRD HV Distribution System”, ALICE DCS Workshop, CERN, March 2005, http://alicedcs.web.cern.ch/AliceDCS/Meetings
XXVI Workshop on Recent Developments in HEP
M. Vassiliou
Thank you!
XXVI Workshop on Recent Developments in HEP
M. Vassiliou
HVDS Crate Structure
TRANSFORMER
HV Input 1
CARD 1
HV Input 2
CARD 2
HV Output 1
(6 channels)
TRANSFORMER
HV Output 2
(6 channels)
TRANSFORMER
HV Input 3
CARD 3
HV Input 15
CARD 15
HV Output 3
(6 channels)
CAN BUS
TRANSFORMER
HV Output 15
(6 channels)
LOW VOLTAGE
POWER
SUPPLIES
DCS BOARD
INPUT
JTAG
OUTPUT
LAN
TRD Principles