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Transcript
CAEN power supplies The neverending story Jennifer Pursley Johns Hopkins University Silicon Workshop II, May 10-12, 2006 University of California, Santa Barbara System overview: Diagram courtesy of J. R. Mumford J. Pursley - Silicon Workshop II 2 Infrastructure: the SY527 Universal Multichannel Power Supply system CAEN mainframe, has 10 board slots NOT custom-made, also used for plug power supplies Communicates via serial connection (RS232 port or CAENET coaxial cable) Control power supplies (settings and on/off) from front panel NOT radiation hard, but located in the collision hall! These are what you hockerize (reboot the crate CPU) J. Pursley - Silicon Workshop II 3 Collision Hall Map: 16 crates Diagram courtesy of M. Stanitzki J. Pursley - Silicon Workshop II Mounted on CH walls, with fib racks 4 crates in each corner, numbered clockwise (sort of…) Roughly, 2 PS crates = 1 fib Even number fib is SVX, odd is ISL/L00 4 Crate Naming Conventions West Side Crate Crate 1 Crate 2 Crate 3 Reset Panel SVX NW Top 1 SVX NW Top 2 SVX SW Top 1 PS Interlocks NW Top Top NW Top Bot SW Top Top Crate 4 Crate 5 Crate 6 SVX SW Top 2 SVX SW Bot 3 SVX SW Bot 4 SW Top Bot SW Bot Top SW Bot Bot Crate 7 Crate 8 SVX NW Bot 3 SVX NW Bot 4 NW Bot Top NW Bot Bot J. Pursley - Silicon Workshop II 5 Crate Naming Conventions East Side Crate Crate 9 Crate 10 Crate 11 Reset Panel SVX NE Top 1 SVX NE Top 2 SVX SE Top 1 PS Interlocks NE Top Top NE Top Bot SE Top Top Crate 12 Crate 13 Crate 14 SVX SE Top 2 SVX SE Bot 3 SVX SE Bot 4 SE Top Bot SE Bot Top SE Bot Bot Crate 15 Crate 16 SVX NE Bot 3 SVX NE Bot 4 NE Bot Top NE Bot Bot J. Pursley - Silicon Workshop II 6 The Workhorse: SVX Modules (A509) Occupies 1 slot in SY527 1 board powers 1 wedge 5 Bias channels 5 Low voltage (AVDD & DVDD) 2 portcard (2V & 5V DOIMs) Total: 18 channels 73 supplies in CH (72 for SVX wedges, 1 for a L00 wedge) VMax = 250V, IMax = 5 mA Cable pinouts designed for SVX Layer 0 1 2 3 4 VMax (V) 170 170 60 140 60 J. Pursley - Silicon Workshop II 7 Next up: ISL Modules (A510) Occupies 2 slots in SY527 1 board powers 1 wedge 10 Bias channels 5 Low voltage (AVDD & DVDD) 2 portcard (2V & 5V DOIMs) Total: 23 channels 30 supplies in CH VMax = 250V, IMax = 5 mA Bias Adapter, double LV cables Layer 00,01 10,11 20,21 30,31 40,41 VMax FWD 60 140 60 140 60 VMax CNTL 140 140 140 140 140 J. Pursley - Silicon Workshop II 8 Finally: L00 Modules (A509H) Occupies 2 slots in SY527 1 board powers 1 wedge 4 + 1 Bias channels 4 Low voltage (AVDD & DVDD) 2 portcard (2V & 5V DOIMs) Total: 15 channels 11 supplies in CH VMax = 500V, IMax = 36/23 mA Sense, LV, and Bias adapers! Extra feature: crowbar on bias line Layer VMax (V) J. Pursley - Silicon Workshop II 0 1 2 3a,3b 90 90 90 160 9 L00 Crowbars Automatic crowbar tester! No light = blown fuse Protect Si from PS failure 2 mA fuse on each bias line Now frequently blown in beam incidents (eg kicker prefires or nasty quenches) Blown fuse = no bias on sensor Most L00 sensors draw measurable current now; check for blown crowbars by biasing L00, look for 0 current J. Pursley - Silicon Workshop II 10 Junction Cards Same junction card used for SVX, ISL, and L00 Cables in CH run from PS racks down into the bore Extra LV and Bias connectors to accommodate ISL And across the COT face… This is the closest we can get to the silicon! Diagram courtesy of J. R. Mumford J. Pursley - Silicon Workshop II 11 Common Failure Modes – SY527 Crate CPU gets in a funny state Some symptoms: “Crate xx lost communication” (or you see anything turn blue in IMON) All supplies in one crate spontaneously turn off Garbled readback of voltage/current of a ladder (could lead to trigger inhibit) Solution: hockerize! Fan failures: frequent in plug crates, but none of ours (yet…) 1 damaged backplane (not fun!) Remember: must turn crate off for ~10 mins before removing power supplies, or could blow a PS fuse J. Pursley - Silicon Workshop II 12 Common Failure Modes – PS Overcurrent trips Overvoltage/Undercurrent trips Approx. the same thing – if the voltage is set above the limit, the supply clamps it down before tripping Usually a PS failure Undervoltage trips Maybe the current is going high – try raising limit, watch plots Also a common PS failure, usually fixable at FCC Supply can’t get to the set voltage Common PS failure (esp. of ISL supplies), NOT fixable at FCC Software protection trips Voltage/current doesn’t trip the hardware Software limits stricter than hardware, but requires the value stay above the limit for several mins before tripping Usually denotes a readback problem, check values in IMON J. Pursley - Silicon Workshop II 13 Less Common Failure Modes Transistor regulating the Bias voltage blows Large current offsets Erratic or oscillatory voltages/currents (seen on DVDD and Bias) Crate doesn’t recognize power supply Symptoms: ladder voltage ramps up to VMax (250V or 500V) and doesn’t trip Can’t be turned off, have to cut power to the whole crate This is the failure mode crowbars were introduced to prevent! Not fully connected to backplane, X28HC256 prom is garbled… None of the other supplies in the crate will work if there’s one in there the crate can’t recognize! Supply won’t work in one particular slot/crate, but is fine in another Usually require expert diagnosis! J. Pursley - Silicon Workshop II 14 Summary Love ‘em or hate ‘em, CAENs are here to stay Increasing frequency of failures may be due to radiation exposure or aging 9 PS swaps in 2005; 4 in first 3 months of 2006 Do our best to: Work w/ FCC to minimize downtime from common failure modes (eg hockerization) Hassle CAEN to make more spare crates and PS (and to fix the broken ones faster!) Get creative (such as, put a PS with failure on one ladder in for a wedge where that ladder is out of the HWDB for other reasons!) J. Pursley - Silicon Workshop II 15 Backup Slides Loadbox testing J. Pursley - Silicon Workshop II Must test a new PS before hooking it up to the detector Do this by cabling it to a junction card with a loadbox attached Loadbox uses constant and variable resistances to mimic a silicon wedge 17