Electronic Systems Support Power Supply Joint Activity Chris

Electronic Systems Support Power Supply Joint Activity Chris Parkman EP Electronic Systems Support (EP-ESS) February 26, 2003 26 Feb '03 - cp Power Supply Joint Activity

Electronic Systems Support Background 26 Feb '03 - cp Power Supply Joint Activity

Power Supply Joint Activity 26 Feb '03 - cp “Joint Activity” n 4 LHC experiments & ESS cooperating on radiation & magnetic field tolerance “pre-approval” for candidate equipment n Wiener PL 500 n n n Work by ATLAS (Hruska) + ESS (Allongue) + Wiener Applications in ATLAS TRT, ATLAS Muons, ALICE TRD CAEN SASY n n Work done by ALICE (? ) + ESS (Allongue) + CAEN Applications in ALICE 3

Power Supply Joint Activity 26 Feb '03 - cp ATLAS n Detector Power Supplies Steering Group n n Internal ATLAS coordination Tender for LV power supplies & components n n n Limited success in promoting common approach n n n Market Survey done, tender in preparation TRT, Muons (MDT only? ), Pixels Technical responsibility Funding ATLAS Tender pending n MS Results n n Companies contacted - 84 Replies - 25 (to date) Not interested - 5 In consideration - 18 4

Power Supply Joint Activity 26 Feb '03 - cp JA Test Description (Nov. 2001) n Radiation (ATLAS requirements) n n SEE - 1*1011 protons/cm 2 TID ~15 krads NIEL ~1. 6*1011 neutrons/cm 2 @ 1 Me. V Magnetic field n n ALICE <5, 000 Gauss ATLAS n n n Muon barrel <500 G Muon end cap <1000 G TRT ? CMS ? LHCb <200 G 5

Electronic Systems Support Requirements (From meeting 26 Oct. 2002) 26 Feb '03 - cp Power Supply Joint Activity

ALICE Power Supply Joint Activity 26 Feb '03 - cp n (G. Stefanini) Continuation of SASY prototype evaluation in “Joint Effort” scheme n n n lab magnetic field (dipole in bldg 168) radiation ? n Continuation of development of “rad tolerant” PL 500 n Proposed activity (if supported with interest and resources) n Participation in the study and test of LV power distribution system: n n low inductance power cabling bus bars conductor cooling etc 7

ATLAS 26 Feb '03 - cp n PIXELs n n SCT n n Power Supply Joint Activity n Wuppertal responsibility Muons RPC n n Prague responsibility Cracow-CERN responsibility In the cavern for bulk and voltage regulators inside detector n n Something like PL 500 from Wiener is OK Willing to tender to go ahead with rad-hard and B tolerant prototype development LARG n n n BNL responsibility Tiles n Roma 2 responsibility Asked CAEN to deliver n TRT n n (Philippe Farthouat) n n Muons TGC n n n Full custom with low and high (10 k. V) voltage 7 -8 k. Gauss + radiation Israel responsibility Not defined yet Muons MDT n n Shared responsibility Bulk with regulators on the detector n n Bulk in the cavern Devices a la PL 500 should be OK Prague responsibility for the design 8

Power Supply Joint Activity 26 Feb '03 - cp LHCb n (Jørgen Christiansen) Major request from LHCb is to find modular power supply system “a la Wiener PL 500” which can be qualified to work in cavern: n n Total dose below 10 krad over 10 years. Neutrons below 2. 6 x 1012 1 Mev neutrons/cm 2 over 10 years Hadrons with an energy above 20 Mev below 6. 4 x 1011 hadrons/cm 2 Magnetic field below 200 Gauss (further shielding may be possible) 9

Power Supply Joint Activity 26 Feb '03 - cp LHC Crate Power Supplies n ESS internal prototype development for EP common project n n n Water cooled remote PS Low power crates – restricted cooling Radiation and magnetic tolerance n n Requests from CMS, LHCb Based on Joint Activity detector PS work 10

Electronic Systems Support Status From the ESS Perspective 26 Feb '03 - cp Power Supply Joint Activity

n Minimal involvement by ESS in magnetic field tests Power Supply Joint Activity 26 Feb '03 - cp CAEN “SASY” DC-DC 12

Power Supply Joint Activity 26 Feb '03 - cp Wiener PL 500 - tests n Radiation tests n SEE tests in Louvain and PSI n n (ATLAS/ESS) Power modules successful up to 1011 p/cm 2 Rectifier module tests failed in Louvain due to a bad opto-coupler. Tests at PSI OK after change of opto-coupler Tests in TCC 2 at CERN n Unit failed due to problems in the MCU board n n ~0. 6 krad Modified MCU still faulty at PSI tests with modified board 13

Power Supply Joint Activity 26 Feb '03 - cp Wiener PL 500 - tests n n Magnetic Field Tests Wiener have performed some tests on shielding efficiency for sensitive components n n Supposed to work up to 1000 Gauss Waiting for a prototype for testing 14

Power Supply Joint Activity 26 Feb '03 - cp Wiener PL 500 - proposed mods ESS – B. Allongue 1. The microprocessor control to be removed from the output voltage control loop • n n 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 15

Power Supply Joint Activity 26 Feb '03 - cp Wiener PL 500 - 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 bypassing the MCU to read the status only 16

Power Supply Joint Activity 26 Feb '03 - cp Wiener PL 500 – proposed mods 4. MCU power recycling in case of SEE n n n 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 n n OVP & OCP is still functional independently of MCU In case of "soft" SEE, the MCU would not be destroyed n The connection would be lost only for few seconds because of power cycling 17

Electronic Systems Support ESS Project 26 Feb '03 - cp Power Supply Joint Activity

Power Supply Joint Activity 26 Feb '03 - cp ESS Project so far… n Wiener n n Radiation magnetic field tolerant crates Detectors n Pursue ATLAS requirements n n n TRT/Muon MDT ALICE? CAEN SASY n CMS have asked for independent check of CAEN results… 19

Power Supply Joint Activity 26 Feb '03 - cp What else? 20

Power Supply Joint Activity 26 Feb '03 - cp Summary of requirements TID krad NIEL n/cm 2 (1 Me. V eq. ) SEE p/cm 2 Β-field Gauss ~15 ~1. 6*1011 1000 <10 2. 6*1012 <6. 4*1011 200 1*1011 1000 ALICE ATLAS (TRT/Muons) CMS LHCb Rad-tol crates 21