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CMS ME CSC HV system Alex Madorsky University of Florida Cathode Strip Chambers Main purpose of the CMS EMU CSC HV system: Provide High Voltage for CMS Endcap Muon Cathode Strip Chambers (CSC) CSC features that affect HV system design: HV segments – high tolerance to HV failures Same working voltage with small variations from segment to segment Problematic segment can be fixed by: Reducing voltage Disconnecting from HV Needs precise consumption current measurement for each segment Small One HV segment November 2003, CERN 2 Alex Madorsky Voltage and current parameters Cosmic Ray Count Rate, 4/6 0.2 0.18 Count Rate (kHz) 0.16 Ar+CO2+CF4 0.14 0.12 40+50+10 0.1 0.08 0.06 0.04 0.02 0 3 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4 HV (kV) Voltage: •The operational point 3.6 kV (full efficiency) •The end of plateau is at 3.9 kV Current: •Current per channel averaged over the full Encap Muon System: ~0.7 uA/segment •Maximum expected current per segment: 2uA •Needs to be monitored on each segment with good precision, to detect possible troubles. November 2003, CERN 3 Alex Madorsky UF/PNPI design UF/PNPI HV system design: 3.5 years of development 3 prototypes + pre-production prototype produced Prototypes passed all tests November 2003, CERN 4 Alex Madorsky Target specifications (1) System structure See Figure 1 Mainframe Power supply functions 1. “Master” High Voltage (Vmax) generation and regulation 2. Distribution boards control 3. Distribution boards low voltage power (under discussion) 4. User interface 5. CMS SCADA interface 126 + 13 spares 36-channel boards 144 + 15 spares 30-channel boards Number of distribution boards Number of output channels of the distribution board 36 or 30 Distribution board output organization Output HV connectors One connector LEMO REDEL SLA.H51 for 30 HV outputs or two LEMO REDEL SLA.H51 for 18+18 HV outputs Pin assignment defined by customer, connectors with the HV wires (1 m) attached are supplied by customer. There are 30 or 18 wires for HV outputs in each connector, 3 ground wires, 2 interlock and 2 reserved wires. 4000 V Maximum output voltage, Vmax Voltage regulation individually for each output, software programmable Vmax – 500 V to Vmax, with the possibility to turn off Voltage regulation resolution, individually for each output, software programmable Less or equal to 50V November 2003, CERN 5 Alex Madorsky Target specifications (2) Channel to channel output voltage difference Voltage output Capacitive load for each output 20 V max Maximum output current, Imax 100 A Individual output turn-off (trip) speed Programmable, from 1 s Trip level, software programmable 1 to 100 A Trip level setting resolution 1 A Hardwired trip level (erroneous software protection) 100 A Maximum total output current of the board (sum of all outputs) 40 A * number of outputs Ripple and noise Common mode ripple, measured on 1 KOhm resistor 10 mV p-p maximum, bandwidth 100 Hz – 20 MHz 50 mV p-p maximum, bandwidth 100 Hz – 20 MHz Mutual influence of channels No trips because of other channel(s) tripping Voltage measurement, individually for each output Current measurement, individually for each output Channel to channel measured current difference Via software, resolution 10V, 0 to Vmax November 2003, CERN Floating (HV return wire insulated from the system ground) 0 - 60 nF Via software, resolution 100 nA or better for currents 0 - 1A, 10% or better for currents >1A to Imax 10% of measured value max. 6 Alex Madorsky Target specifications (3) Current measurement period for each output in the entire system 10 sec or less Rate of voltage change, software programmable 2 to 50 V/s Output control via software Low voltage power input and control Status: OK, tripped, interlock status, overload, on/off, ramp up, ramp down, current limit/measurement Required, with an option to disable, software programmable. The chambers are equipped with the interlock switch, and HV cable has two interlock wires. From mainframe or external, 9 boards per 1 crate High voltage power input From mainframe, one SHV connector HV, LV and control connectors’ positions See Figure 2 LED indication HV on/off, LV on, trip, interlock open Ambient magnetic field for distribution boards 0.3 Tesla constant field, B-field map is available Radiation hardness of the distribution boards 2*1011 neutrons/cm2 and 0.5 krad of ionizing particles Slow control Connection to CMS SCADA required Construction of distribution board 6U or 7U Eurostandard board, up to 700 mm long, 9 or 8 boards per 19” crate (see Figure 2) Protection loop (interlock) November 2003, CERN 7 Alex Madorsky Target specifications (4) Mainframe Power sources (270 outputs) One HV conductor per distribution board (270) plus control and Low Voltage power Distribution Boards • System structure defined by us One conductor per segment (8856) • Master HV sources and control computers in Control Room Chambers • Voltage regulation and monitoring, current measurement by Distribution boards near disks ~100m ~12 m average Figure 1 November 2003, CERN 8 Alex Madorsky Target specifications (5) 36-channel distribution board Two types of distribution boards: • 36 channels (two small chambers) • 30 channels (one large chamber) 6U-7U Output connector defined by us. Output connectors SLA.H51, for two small chambers, shown with the mating cable connector Input connectors: HV, control. HV connector is SHV. Front panel 81 mm 30-channel distribution board 6U7U Output connector SLA.H51, for one large chamber, shown with the mating cable connector Input connectors: HV, control Front panel ~ 700 mm max Figure 2 November 2003, CERN 9 Alex Madorsky UF/PNPI HV system architecture Counting Room Detector Area Card 72 Remote Distribution Card Type 1 Card 9 Primary HV Supply Card 1 Card 1 Master Distribution Card Long Distance HV Cables Multiwire HV cables, ~ 100 m long 100 m, one per 18 SHV Connectors distribution boards on both ends Remote Distribution Card Type 2 Multiwire HV Cable ~ 12 m long LEMO REDEL Connectors on both ends •Primary Three Main Units: Primary Master Distribution Card, Remote Distribution Card HV power supplies:HV offSupply, the shelf One Primary HV Supply per up to 9 Master Distribution Cards board: One output distribution board. Outputs Regulates voltage 0-4KV (VMAX), measures current on each •Master Master Distribution Card:per 1 Input, 8 Independent output. One Master Distribution Card per 8 Remote Distribution Cards •Remote RemoteDistribution Distributionboard: Card Type 1: 1one Input, 30or Independent Outputs (36 outputs max). Regulates voltage 1KV down powers large two small chambers (One Card per one ME 23/2 Chamber) from VMAX, measures current on each output. Each output can be disconnected from HV if necessary. Remote Distribution Card Type 2: 1 Input, 36 Independent Outputs (One Card per two ME1 Chambers) November 2003, CERN 10 Alex Madorsky Control interface HOST PROCESSOR UNIT VGA USB-GP-IB HOST PROCESSOR ETHERNET SCADA INTERFACE (DIM SERVER) PRIMARY HV POWER SUPPLY PCI BUS SERIAL BUS 6 72 HV CABLES (ONE PER REMOTE CARD) 9 9 REMOTE DISTR. CARD 1 REMOTE DISTRIBUTION CRATE 8 REMOTE DISTR. CARD 9 REMOTE DISTRIBUTION CRATE 2 REMOTE DISTR. CARD 1 REMOTE DISTR. CARD 9 REMOTE DISTRIBUTION CRATE 1 MASTER DISTR. CARD 9 HOST CARD 6 UP TO 144 MULTIWIRE HV CABLES IN TOTAL UP TO 2582 LEADS November 2003, CERN 11 Alex Madorsky REMOTE DISTR. CARD 9 9 REMOTE DISTR. CARD 1 HOST CARD 5 SERIAL BUS 5 HOST CARD 2 SERIAL BUS 2 SERIAL BUS 1 HOST CARD 1 MASTER DISTR. CARD 1 MASTER DISTRIBUTION CRATE US CMS Review on June 24th 2003 in UF UF/PNPI system selected over CAEN Reasons: Price Design features: Conducted Simple and robust design No programmable logic in radiation – no SEU November 2003, CERN 12 Alex Madorsky UF/ PNPI CMS EMU CSC HV System Main Design Features Main technical approaches are shown HV regulator Current sensor Fuse control Digital control interface Mechanical design November 2003, CERN 13 Alex Madorsky HV regulator (distribution board) HV IN HV OUT Q1 C2 R1 HV MONITOR + C1 R2 HV CONTROL INPUT U1A + - R3 U2A CONTINUOS CLOCK Q2 • Output voltage controlled by linear regulator (Q1) • Regulates down to –1000V from input voltage • Voltage measured by divider R1-R2 and U1A opamp. • Regulator feedback via U2A • Q2 and C1 provide HV decoupling November 2003, CERN 14 Alex Madorsky Current sensor I U=IRs R2 R3 Rs Cv=KU Ug D1 C1 C2 CHARGE SENSITIVE AMP. R4 Q=UgCv U3A Uout + R5 Cf Uout=QCf=UgCvKuIRsCf=KI • Current measured across Rs • Varicap D1 is used as voltage-sensitive element • Input pulse is applied via C1 • U3A is a charge-sensitive amplifier November 2003, CERN 15 Alex Madorsky Fuse control HV IN MASTER CARD 4KV REGULATOR POSITIVE REMOTE CARD HV CABLE HV CAB LE 1KV REGULATOR FUSE 100mA HV RELAY DIODE RES IST OR Q3 LV POWER SUPPLY NEGATIVE GND 100K FUSE CONTROL COUNTING ROOM DETECTOR AREA • Situation requiring permanent disconnect is extremely rare (never happened on FAST sites) • Fuse is used to disconnect channel from HV permanently • To blow fuse: • Low negative voltage applied to channel input • Switch Q3 shorted • Fuse can be quickly replaced during short access November 2003, CERN 16 Alex Madorsky Control interface LOGIC FROM/TO 36 HV CARDS 36 CHANNEL HV MONITOR 36 CHANNEL I MONITOR 36 CHANNEL HV CONTROL ANALOG MULTIPLEXER SERIAL DAC ANALOG MULTIPLEXER SERIAL ADC CLK N MODULE COUNTER RST ANALOG MULTIPLEXER SERIAL ADC CLK ADDRESS COUNTER RST CLK R/W DATA OUT DATA OUT 12 LINE HVM SERIAL BUS • Differential signal transmission (RS-485) • Optically insulated • Built completely on discrete logic November 2003, CERN 17 Alex Madorsky DATA IN Control software Based on PVSS and DIM server Initial version of DIM server and PVSS shell works Written with excellent assistance of Valery Sytnik (UC Riverside) Targeted for full DCS compatibility Work in progress November 2003, CERN 18 Alex Madorsky Mechanical construction • Final mechanical construction • Simple and rugged design • PCB is optimized for automatic assembly November 2003, CERN 19 Alex Madorsky Distribution Rack Fan unit & heat exchanger Need from CMS: Distribution crate Distribution boards 1. Racks 2. Fan units & heat exchangers 3. Strain reliefs 4. Space in front and behind the racks 5. Low Voltage power for distribution boards HV and control cables patch panel Output HV cables to chambers November 2003, CERN 20 Alex Madorsky Distribution Racks Disk 1(Station 1) Disk 2 (Stations 2 and 3) Disk 3 (Station 4) Position in Rack Rack 1 Rack 1 TOP Crate 1: 936 Crate 2: 936 Crate 3: 936 Crate 4: 936 Rack 1 (right half of the disk) Crate 1: 930 Crate 2: 930 Crate 3: 930 Crate 4: 930 Crate 5: 936 BOTTOM Rack 2 (left half of the disk) Crate 1: 930 Crate 2: 930 Crate 3: 930 Crate 4: 930 Crate 5: 936 Crate 1: 936 In the table above: • 9x30 means 9 boards of 30 channels. One board of 30 channels powers one ME23/2 chamber • 9x36 means 9 boards of 36 channels. One board of 36 channels powers two ME23/1 (or similar) chambers • This table shows the HV distribution boards necessary for one Endcap (+ or -). November 2003, CERN 21 Alex Madorsky Rack position for YE1 and YE2 YE1 has only one rack November 2003, CERN 22 Alex Madorsky Low Voltage Requirements for Remote Distribution Cards Parameter Min Max Positive voltage 7V 8V Negative voltage -8 V -7 V Current on both channels Power per distribution board Ripple/noise 300 mA 4.2 W 4.8 W 100 mV • Low voltage power will be provided by CMS AC/DC LV system November 2003, CERN 23 Alex Madorsky Cooling Only remote distribution racks are discussed. Dissipated heat: 4.8 W maximum per distribution board (about 3-4% of one chamber LV power) ~216 W per rack maximum (45 boards) ~1335 W for all distribution boards Cooling of distribution boards: No enforced cooling is currently planned Racks must be open on top and bottom for convection Need heat exchangers to remove generated heat May need fans (unlikely, will decide later) November 2003, CERN 24 Alex Madorsky Safety HV Cables KERPEN halogen-free cables Passed CERN flammability test HV Connectors LEMO/REDEL, bought from CERN stock PCB material FR-4, flammability rating 94-V0 Other components Will be checked for CERN safety compliance November 2003, CERN 25 Alex Madorsky Design status Boards’ design complete (electrical and mechanical) Pre-production prototype constructed in UF, under tests now Tests of the pre-production prototype: Full bench test – OK Chamber test on FAST site – OK Radiation test – OK Magnetic field test – November ’03 Production boards - exact copy of the pre-production prototype November 2003, CERN 26 Alex Madorsky UF-PNPI collaboration MOU between UF and PNPI is signed Arrangement is very similar to chamber production UF responsibility: Development and production management Pre-production prototype construction and testing Test stands construction Test procedures verification, instructions Off-the-shelf components procurement Bare PCBs manufacturing Automated SMT assembly US labor and components contingency November 2003, CERN 27 Alex Madorsky UF-PNPI collaboration PNPI responsibility: Simple mechanical components manufactured Pre-production and production manual assembly Pre-production and production testing PNPI labor and space contingency November 2003, CERN 28 Alex Madorsky Schedule – November ’03 Board production and SMT assembly start in US – end of November ’03 Start of pre-production run in PNPI – end of January ’04 Pre-production system test in UF – May ’04 PNPI production readiness review, production start – July ’04 Production finish – June ‘05 ESR November 2003, CERN 29 Alex Madorsky Installation and commissioning Installation: To be done by CERN crew & UF/PNPI visitors Will start as soon as the first shipment arrives to CERN (Oct 04’) Very uncomplicated 278 distribution boards, 30 crates HV cables already installed by that time Commissioning: power supplies are necessary – at least prototype Would like to start as early as possible (Oct ‘04) LV November 2003, CERN 30 Alex Madorsky Conclusions Design solutions are proved to be working Pre-production prototype built Pre-production prototype passed tests Satisfies CMS EMU CSC HV system specs Production documentation is being prepared November 2003, CERN 31 Alex Madorsky Radiation environment Expected: Neutron Fluence: (1 - 4) x 10^10/sq cm Total Ionizing Dose: ( 0.07 – 0. 7) kRad November 2003, CERN 32 Alex Madorsky