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Pixel Endcap Power Distribution Phase 1 Upgrade Plans Fermilab, University of Mississippi, University of Iowa Lalith Perera University of Mississippi CMS Upgrade Workshop 10/28/2009 Current Endcap Power Distribution System CAEN A4603 ~40m cable filter card ~4m PP1 PP0 ~1m ~1.5m port card adapter card Flex cable to the adapter card Power filter cards 10/28/2009 Cables from filter card CMS Upgrade Workshop 2 Current endcap power cont… • Each cable powers 6 panels - 135 ROC, 6 TBMs • Vdig/Vana voltage sensing is done very close to the detector on the adapter card • Overall resistance – mostly in the 40m cable – analog 0.6 ohms – digital 0.4 ohms 10/28/2009 Vset Vconn I Analog 1.6V 3.6V 3.4A Digital 2.6V 4.2V 3.8A CMS Upgrade Workshop 3 Endcap Phase 1 Upgrade Requirements • Phase 1 upgrade – 7 blades per cable - 224 ROC, 14 TBMs • Digital current will go up with the luminosity – say 30% CAEN A4603 rating Vset Vcon I max Vcon max I analog 1.6V 4.9V 5.6A 5.8V 6A digital 2.6V 5.8V 8.6A 7V 13A • Current CAEN A4603 supplies are marginally adequate for the phase 1 upgraded endcap detector – lower safety margin – At the turn on, ROC (PSI46) takes a higher current – have to modify CAEN modules for more voltage/power 10/28/2009 CMS Upgrade Workshop 4 Upgrade power requirements cont.. • Pixel barrel detector has to use DC-DC converters to provide power with the existing power infrastructure. – Need modifications to CAEN modules suitable to use DC-DC converters • Modifications to CAEN modules are expensive – quote 6k Euro/module for changing maximum V/I set values – for higher maximum driving voltage (Vcon) it would be more (a new design) • We will follow the same scheme as the barrel detector using DC-DC converters – Same power system for the whole pixel detector – Experience for the Phase 2 upgrade 10/28/2009 CMS Upgrade Workshop 5 Possible layout for DC-DC converters • Phase 1: Analog current 6A, digital current 9A • We will need multiple converters per each segment/cable – DC-DC converter rating about 3A – 3-4 converters for the analog – 4 or 7 converters for digital • They will be placed on a PCB equivalent to the current power filter card near the end flange • Issues: – This is about 2m from the detector: • there will be a voltage drop. • How do we measure the actual voltage/current at the detector 10/28/2009 CMS Upgrade Workshop 6 Possible layout, cont... – Only fixed set of voltages are available (AMIS2). – Hardwired - less flexible in case require to change voltages. – May not be a problem with the new ROC. • Even if the DC-DC converter chip is remotely programmable it is not straightforward to establish a communication path. – Few spare cables in the power cable may be used for signaling but the other end of the cable is at the CAEN racks (X2F balcony) – DCU/portcars are located about 1.5 from the end flange, communicate through FEC may need additional cabling in the service cylinder 10/28/2009 CMS Upgrade Workshop 7 Work done at the Fermilab # of pixels • We have built DC-DC converters with commercially available converters – used with the PSI46 and the CAPTAN system. • Noise Susceptibility measurements – Studied the behavior of the ROC injecting noise to the digital power line • Results have been presented in previous power WG meetings – No significant degradation of the ROC performance with noise in power. Vcal ROCs Test setup with DAQ /Power boards 10/28/2009 Threshold distribution (S-curve) LM2734 vs Linear regulator CMS Upgrade Workshop 8 EMI Noise measurements • We are in the process of setting up an EMI test stand – Followed CERN set up – Home built LISN similar to CERN design, 100 Ohm AC resistance 200k-50 MHz 10/28/2009 CMS Upgrade Workshop 9 EMI noise measurement cont Z _d iff 140 120 100 80 60 Z_diff 40 20 0 0.01 0.1 1 10 LISN impedance 100 MhZ • We also built a RF shield box – Metal box to shield from external RF sources – Inside covered with RF absorbing ceramic to minimize reflecting RF from the DUT. 10/28/2009 CMS Upgrade Workshop 10 Plans • Test the DC-DC converter with the CERN power converter chip and make performance tests. – Performance of the pixel ROC – EMI noise • Test the system at a 1.5 Tesla field • Do a full scale test with actual power cable, modified CAEN power modules, DC-DC converter and an Fpix pixel detector panel 10/28/2009 CMS Upgrade Workshop 11