electronic systems support power supply joint activity chris parkman ep electronic systems support...
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Electronic Systems Support
Power Supply Joint Activity
Chris ParkmanEP Electronic Systems Support (EP-ESS)
February 26, 2003
Electronic Systems Support
Background
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“Joint Activity” 4 LHC experiments & ESS cooperating
on radiation & magnetic field tolerance“pre-approval” for candidate equipment Wiener PL500
Work by ATLAS (Hruska) + ESS (Allongue) + Wiener
Applications in ATLAS TRT, ATLAS Muons, ALICE TRD
CAEN SASY Work done by ALICE (?) + ESS (Allongue) +
CAEN Applications in ALICE
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ATLAS Detector Power Supplies Steering Group
Internal ATLAS coordination Tender for LV power supplies & components
Market Survey done, tender in preparation TRT, Muons (MDT only?), Pixels
Limited success in promoting common approach
Technical responsibility Funding
ATLAS Tender pending MS Results
Companies contacted - 84 Replies - 25 (to date) Not interested - 5 In consideration - 18
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JA Test Description (Nov.2001)
Radiation (ATLAS requirements) SEE - 1*1011 protons/cm2
TID ~15 krads NIEL ~1.6*1011 neutrons/cm2 @ 1MeV
Magnetic field ALICE <5,000 Gauss ATLAS
Muon barrel <500G Muon end cap <1000G TRT ?
CMS ? LHCb <200G
Electronic Systems Support
Requirements
(From meeting 26 Oct. 2002)
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ALICE (G.Stefanini) Continuation of SASY prototype evaluation in “Joint
Effort” scheme lab magnetic field (dipole in bldg 168) radiation ?
Continuation of development of “rad tolerant” PL500
Proposed activity (if supported with interest and resources)
Participation in the study and test of LV power distribution system:
low inductance power cabling bus bars conductor cooling etc
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ATLAS (Philippe Farthouat) PIXELs
Wuppertal responsibility SCT
Prague responsibility TRT
Cracow-CERN responsibility In the cavern for bulk and
voltage regulators inside detector
Something like PL500 from Wiener is OK
Willing to tender to go ahead with rad-hard and B tolerant prototype development
LARG BNL responsibility
Tiles Prague responsibility for
the design
Muons RPC Roma 2 responsibility Asked CAEN to deliver
Full custom with low and high (10 kV) voltage
7-8 kGauss + radiation Muons TGC
Israel responsibility Not defined yet
Muons MDT Shared responsibility Bulk with regulators on the
detector Bulk in the cavern
Devices a la PL500 should be OK
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LHCb (Jørgen Christiansen)
Major request from LHCb is to find modular power supply system “a la Wiener PL500” which can be qualified to work in cavern: Total dose below 10krad over 10
years. Neutrons below 2.6x1012 1Mev
neutrons/cm2 over 10 years Hadrons with an energy above 20Mev
below 6.4x1011 hadrons/cm2
Magnetic field below 200 Gauss (further shielding may be possible)
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LHC Crate Power Supplies ESS internal prototype
development for EP common project Water cooled remote PS Low power crates – restricted cooling
Radiation and magnetic tolerance Requests from CMS, LHCb Based on Joint Activity detector PS
work
Electronic Systems Support
Status
From the ESS Perspective
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CAEN “SASY” DC-DC Minimal involvement by ESS in
magnetic field tests
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Wiener PL500 - tests Radiation tests (ATLAS/ESS)
SEE tests in Louvain and PSI Power modules successful up to 1011 p/cm2
Rectifier module tests failed in Louvain due to a bad opto-coupler.
Tests at PSI OK after change of opto-coupler Tests in TCC2 at CERN
Unit failed due to problems in the MCU board
~0.6krad Modified MCU still faulty at PSI tests with
modified board
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Wiener PL500 - tests Magnetic Field Tests Wiener have performed some
tests on shielding efficiency for sensitive components Supposed to work up to 1000 Gauss
Waiting for a prototype for testing
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Wiener PL500 - proposed mods
ESS – B.Allongue
1. The microprocessor control to be removed from the output voltage control loop
• At the moment, the input data for DAC and PWM controller comes from the microprocessor
All protection, OVP, OCP should be achieved by means of a voltage reference and not by the microprocessor
Threshold could be set by a resistive divider according to the user specification
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Wiener PL500 - proposed mods
2. Control - MCU should• Set on/off• Trim output voltage in specified
range• Within a defined range• Use the DAC, but with a hardware lock
• Monitor
3. Interlock• Crate should have interlock IN/OUT
connected straight to the DCDC PWM by-passing the MCU
• MCU to read the status only
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Wiener PL500 – proposed mods
4. MCU power recycling in case of SEE RESET is not sufficient. In this case it is possible to “have access” to
the supply in any case of MCU problems and keep the electronics running by HWLOCK
Output voltage constrained to remain within safe limits OVP & OCP is still functional independently of MCU
In case of "soft" SEE, the MCU would not be destroyed The connection would be lost only for few seconds
because of power cycling
Electronic Systems Support
ESS Project
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ESS Project so far… Wiener
Radiation magnetic field tolerant crates
Detectors Pursue ATLAS requirements
TRT/Muon MDT ALICE?
CAEN SASY CMS have asked for independent
check of CAEN results…
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What else?
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Summary of requirements
TIDkrad
NIELn/cm2
(1MeV eq.)
SEEp/cm2
Β-field
Gauss
ALICE
ATLAS (TRT/Muons)
~15 ~1.6*1011 1*1011 1000
CMS
LHCb <10 2.6*1012 <6.4*101
1
200
Rad-tol crates 1*1011 1000
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