Endcap Muon CSC Software Update Tim Cox (UC Davis) US CMS EMU Meeting, CERN Jun-2002.
CMS ME CSC HV system
description
Transcript of CMS ME CSC HV system
CMS ME CSC HV systemCMS ME CSC HV system
Alex MadorskyUniversity of Florida
November 2003, CERNAlex
Madorsky2
Cathode Strip ChambersCathode Strip ChambersMain 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: Small 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
One HV segment
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Voltage and current parametersVoltage and current parametersCosmic Ray Count Rate, 4/6
0
0.02
0.04
0.06
0.08
0.1
0.12
0.14
0.16
0.18
0.2
3 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4
HV (kV)
Co
un
t R
ate
(k
Hz)
40+50+10
Ar+CO2+CF4
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.
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UF/PNPI designUF/PNPI design
UF/PNPI HV system design:
3.5 years of development 3 prototypes + pre-production prototype produced Prototypes passed all tests
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Target specifications (1)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
Number of distribution boards 126 + 13 spares 36-channel boards 144 + 15 spares 30-channel 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.
Maximum output voltage, Vmax 4000 V
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
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Target specifications (2)Target specifications (2)Channel to channel output voltage difference
20 V max
Voltage output Floating (HV return wire insulated from the system ground) Capacitive load for each output 0 - 60 nF
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 10 mV p-p maximum, bandwidth 100 Hz – 20 MHz Common mode ripple, measured on 1 KOhm resistor
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
Via software, resolution 10V, 0 to Vmax
Current measurement, individually for each output
Via software, resolution 100 nA or better for currents 0 - 1A, 10% or better for currents >1A to Imax
Channel to channel measured current difference
10% of measured value max.
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Target specifications (3)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 Status: OK, tripped, interlock status, overload, on/off, ramp up, ramp down, current limit/measurement
Protection loop (interlock) Required, with an option to disable, software programmable. The chambers are equipped with the interlock switch, and HV cable has two interlock wires.
Low voltage power input and control 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)
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Target specifications (4)Target specifications (4) Mainframe Power sources
(270 outputs)
Distribution Boards One HV conductor per
distribution board (270) plus control and Low Voltage power
One conductor per segment (8856)
~100m ~12 m average
Cha
mbe
rs
Figure 1
• System structure defined by us
• Master HV sources and control computers in Control Room
• Voltage regulation and monitoring, current measurement by Distribution boards near disks
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Target specifications (5)Target specifications (5)
Output connectors SLA.H51, for two small chambers, shown with the mating cable connector
Input connectors: HV, control. HV connector is SHV.
Front panel
36-channel distribution board
Output connector SLA.H51, for one large chamber, shown with the mating cable connector
Input connectors: HV, control
Front panel
30-channel distribution board
~ 700 mm max
6U-7U
6U-7U
81 mm
Figure 2
Two types of distribution boards:
• 36 channels (two small chambers)
• 30 channels (one large chamber)
Output connector defined by us.
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UF/PNPI HV system architectureUF/PNPI HV system architecture
Card 72
Counting Room Detector Area
Long Distance HV Cables ~ 100 m long
SHV Connectors on both ends
Primary HV Supply
Multiwire HV Cable ~ 12 m long
LEMO REDEL Connectors on both ends
Three Main Units: Primary HV Supply, Master Distribution Card, Remote Distribution Card One Primary HV Supply per up to 9 Master Distribution Cards Master Distribution Card: 1 Input, 8 Independent Outputs One Master Distribution Card per 8 Remote Distribution Cards Remote Distribution Card Type 1: 1 Input, 30 Independent Outputs
(One Card per one ME 23/2 Chamber) Remote Distribution Card Type 2: 1 Input, 36 Independent Outputs
(One Card per two ME1 Chambers)
Card 1
Card 9
Card 1
Master Distribution
Card
Remote Distribution
Card Type 1
Remote Distribution
Card Type 2
Multiwire HV cables, 100 m, one per 18 distribution boards
•Primary HV power supplies: off the shelf
•Master board: One output per distribution board. Regulates voltage 0-4KV (VMAX), measures current on each output.
•Remote Distribution board: powers one large or two small chambers (36 outputs max). Regulates voltage 1KV down from VMAX, measures current on each output. Each output can be disconnected from HV if necessary.
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Control interfaceControl interface
HOST PROCESSOR
PCI BUS
RE
MO
TE
DIS
TR
. C
AR
D 9
RE
MO
TE
DIS
TR
. C
AR
D 1
VGA
ETHERNET USB-GP-IB
REMOTE DISTRIBUTION CRATE 1
PRIMARY HV POWER SUPPLY
SE
RIA
L B
US
1
SE
RIA
L B
US
5 SERIAL BUS 6
UP TO 144 MULTIWIRE HV CABLES IN TOTAL UP TO 2582 LEADS
SCADA INTERFACE (DIM SERVER)
HOST PROCESSOR UNIT
HOST CARD 1
9
HOST CARD 2
HOST CARD 6
HOST CARD 5
RE
MO
TE
DIS
TR
. C
AR
D 9
RE
MO
TE
DIS
TR
. C
AR
D 1
REMOTE DISTRIBUTION CRATE 2
9
RE
MO
TE
DIS
TR
. C
AR
D 9
RE
MO
TE
DIS
TR
. C
AR
D 1
REMOTE DISTRIBUTION CRATE 8
9
MA
ST
ER
DIS
TR
. C
AR
D 9
MA
ST
ER
DIS
TR
. C
AR
D 1
MASTER DISTRIBUTION CRATE
SE
RIA
L B
US
2
72 HV CABLES (ONE PER REMOTE CARD)
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US CMS ReviewUS CMS Review
Conducted on June 24th 2003 in UFUF/PNPI system selected over CAENReasons:
Price Design features:
Simple and robust designNo programmable logic in radiation – no SEU
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UF/ PNPI UF/ PNPI CMS EMU CSC HV System Main Design FeaturesCMS EMU CSC HV System Main Design Features
Main technical approaches are shownHV regulatorCurrent sensorFuse controlDigital control interfaceMechanical design
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HV regulator (distribution board)HV regulator (distribution board)Q1
R1
-
+
U1AR2
-
+
U2A
Q2
R3
C1
C2
HV CONTROL INPUT
CONTINUOS CLOCK
HV MONITOR
HV OUTHV IN
• 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
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Current sensorCurrent sensor
R2 R3
D1C1 C2
+
-
U3A
R5
R4
I
Cv=KU
U=IRs
Q=UgCv
Ug
CHARGE SENSITIVE AMP.
Uout=QCf=UgCvKuIRsCf=KI
Rs
Uout
Cf
• Current measured across Rs
• Varicap D1 is used as voltage-sensitive element
• Input pulse is applied via C1
• U3A is a charge-sensitive amplifier
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Fuse controlFuse control
HV CABLEHV CABLE
FUSE
DIODE
RESISTORQ3
REMOTE CARDMASTER CARD
4KV REGULATORPOSITIVE
LV POWER SUPPLYNEGATIVE
HV IN
1KV REGULATOR
FUSE CONTROL
100mA
COUNTING ROOM
100K
DETECTOR AREA
HV RELAY
GND
• 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
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Control interfaceControl interface
12 LINE HVM SERIAL BUS
ANALOG ANALOG ANALOG MULTIPLEXERMULTIPLEXER MULTIPLEXER
CLK COUNTER
ADDRESS
RST
SERIAL ADC
SERIAL ADC
36 CHANNEL HV MONITOR
SERIAL DAC
36 CHANNEL HV CONTROL36 CHANNEL I MONITOR
FROM/TO 36 HV CARDS
COUNTER
N MODULE
LOGIC
CLK R/W
CLK
RST
DATA OUTDATA OUTDATA IN
• Differential signal transmission (RS-485)
• Optically insulated
• Built completely on discrete logic
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Control softwareControl software
Based on PVSS and DIM serverInitial version of DIM server and PVSS shell worksWritten with excellent assistance of Valery Sytnik (UC
Riverside)Targeted for full DCS compatibilityWork in progress
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Mechanical constructionMechanical construction
• Final mechanical construction
• Simple and rugged design
• PCB is optimized for automatic assembly
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Distribution RackDistribution Rack
Fan unit & heat exchanger
Distribution crate
Distribution boards
HV and control cables patch panel
Output HV cables to chambers
Need from CMS:
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
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Distribution RacksDistribution Racks
Disk 1(Station 1) Disk 2 (Stations 2 and 3) Disk 3 (Station 4)
Position in Rack Rack 1 Rack 1 (right half of the disk)
Rack 2 (left half of the disk)
Rack 1
TOP Crate 1: 936 Crate 1: 930 Crate 1: 930
Crate 2: 936 Crate 2: 930 Crate 2: 930
Crate 3: 936 Crate 3: 930 Crate 3: 930
Crate 4: 936 Crate 4: 930 Crate 4: 930 Crate 1: 936
BOTTOM Crate 5: 936 Crate 5: 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 -).
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Rack position for YE1 and YE2Rack position for YE1 and YE2
YE1 has only one rack
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Low Voltage Requirements for Low Voltage Requirements for Remote Distribution CardsRemote Distribution Cards
Parameter Min Max
Positive voltage 7 V 8 V
Negative voltage -8 V -7 V
Current on both channels
300 mA
Power per distribution board
4.2 W 4.8 W
Ripple/noise 100 mV
• Low voltage power will be provided by CMS AC/DC LV system
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CoolingCoolingOnly 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 plannedRacks must be open on top and bottom for convectionNeed heat exchangers to remove generated heatMay need fans (unlikely, will decide later)
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SafetySafety
HV CablesKERPEN halogen-free cablesPassed CERN flammability test
HV ConnectorsLEMO/REDEL, bought from CERN stock
PCB materialFR-4, flammability rating 94-V0
Other componentsWill be checked for CERN safety compliance
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Design statusDesign status
Boards’ design complete (electrical and mechanical) Pre-production prototype constructed in UF, under tests nowTests 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
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UF-PNPI collaborationUF-PNPI collaboration
MOU between UF and PNPI is signedArrangement 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
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UF-PNPI collaborationUF-PNPI collaboration
PNPI responsibility: Simple mechanical components manufactured Pre-production and production manual assembly Pre-production and production testing PNPI labor and space contingency
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ScheduleSchedule
ESR – November ’03Board production and SMT assembly start in US – end of
November ’03Start of pre-production run in PNPI – end of January ’04Pre-production system test in UF – May ’04PNPI production readiness review, production start – July ’04Production finish – June ‘05
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Installation and commissioningInstallation and commissioningInstallation:
To be done by CERN crew & UF/PNPI visitorsWill start as soon as the first shipment arrives to CERN (Oct
04’)Very uncomplicated278 distribution boards, 30 cratesHV cables already installed by that time
Commissioning:LV power supplies are necessary – at least prototypeWould like to start as early as possible (Oct ‘04)
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ConclusionsConclusions
Design solutions are proved to be workingPre-production prototype builtPre-production prototype passed testsSatisfies CMS EMU CSC HV system specsProduction documentation is being prepared
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Radiation environmentRadiation environmentExpected:
Neutron Fluence: (1 - 4) x 10^10/sq cmTotal Ionizing Dose: ( 0.07 – 0. 7) kRad