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