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Upgrade Proposal for HLT Power Enhancement in 34th ALICE DCS Workshop

The 34th ALICE DCS Workshop proposes a significant upgrade to the High-Level Trigger (HLT) system, aiming to double the computing power from 150 kW to 300 kW. This enhancement requires careful management of power distribution, with all Y-racks on UPS and all X,Z racks on EXD. The proposal estimates approximately 9 kW per mono rack, with a maximum current of 30A per phase, necessitating perfect balance to avoid overloading. Additionally, the workshop addresses unresolved issues with old cabling and fan failures, emphasizing the need for timely solutions.

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Upgrade Proposal for HLT Power Enhancement in 34th ALICE DCS Workshop

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  1. HLT power (CR2) 34th ALICE DCS Workshop • Due to RCU upgrade HLT expects to double computing power • 150kW -> 300kW • Cannot be all UPS (will compete with DAQ) • Proposal HLT: • All Y-racks on UPS (17) • All X,Z-racks on EXD (18) • 5 Z rack as reserve • Estimate per rack: ~9kW (mono) • ~ 15A per phase -> 30A per ‘depart’ • close to limit (32A), needs ‘perfect’ balance over phases • To be discussed with EL

  2. CR2 – alimente depuis nouveau EOD2/20 X01 ( - - ) Y01 (- - ) Z01 ( - - ) X02 ( - - ) Y02 (y01) Z02 ( - - ) 208/20 Y03 (y02) Z03 (z01) X03 ( - - ) 217/20 Y04 (y03) X04 (- - ) Z04 (z02) 209/20 X05 (- - ) Y05 (y04) Z05 (z03) 218/20 X06 ( - - ) Y06 (y05) Z06 (z04) 210/20 X07 (EXD2/20) Y07 (y06) Z07 (z05) 219/20 X08 (x01) Z08 (z06) Y08 (y07) 203/20 211/20 X09 (x02) Y09 (y08) Z09 (z07) 220/20 X10 (x03) Y10 (y09) Z10 (z08) 204/20 212/20 Y11 (y10) X11 (x04) Z11 ( - - ) X12 (x05) Z12 ( - - ) Y12 (y11) 205/20 213/20 Y13 (y12) X13 (x06) Z13 ( - - ) X14 (x07) Z14 (z09) Y14 (y13) 206/20 214/20 221/20 X15 (x08) Y15 (y14) Z15 (z10) Y16 (y15) Z16 (z11) X16 (x09) 207/20 Y17 (y16) X17 (x10) Z17 (z12) 215/20 222/20 Y18 (y17) Z18 (z13)

  3. HLT power (CR2) 34th ALICE DCS Workshop • New cables from new switchboard to new splitter box installed • Splitter boxes not yet installed (but prepared) • Old cabling (EXD, Hazemeyer) still in place

  4. Turbines UX racks 34th ALICE DCS Workshop • Many failures • Fan gets loose from motor • Will need to order 100 pairs • Perform exchange close to racks (limit transport) • Will do a ‘test exchange’ with Fred to estimate time and place needed

  5. 34th ALICE DCS Workshop

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