Resoconto Electronics week

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Resoconto Electronics week

• CERN 18-22 Novembre 2002

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Rack occupancy requirements /RPC Barrel
Assuming racks being 2.6m high and 56U of usable
vertical space each (1)
(1)to be verified the cooling system Together
with the ESS Group _at_ CERN

• we need of the following space
• Slot count
• 4 Control Board/quadrant ? 4 slots
• 12 RBs/quadrant ? 24 slots
• TOTAL 28
  slots
• Plus 3 Low Voltage Link Board ? 6 (9) slots
• Total/quadrant 34 (37) slots
• at least 2
  Crates/quadrant
• Vertical space
• Crate 6U
• Patch Panel 4U
• Heat Exchanger 2U x 2/quadrant
• Cooling Control 2U
• -----------------------------------------------
• Total 28U/quadrant

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Scheme of the crates/quadrant

• Control Board (CB)
• Remote Board (RB)
• Low Voltage LBBox (LVLB)

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Barrel
Crate Rack count
The barrel system consists of
2 SY1527
LB power consumption 15 W LB-Box 250 W (13/15
2CB)
(1) Under test LVLB 5V x 80A occupying 2 VME slots
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HV and LV power requirements
Barrel
LV working value/channel 7 V Analog current
absorption/channel ( 6 FEBs) 0.42 A ?
3W Digital current absorption/channel (6 FEBs)
0.85 A ? 6W
HV working voltage/channel 10 kV Working
Current 0.1 mA/channel 1 HV channel/ bigap
(3) Safety factor 3 (4) ? 10. Includes power on
cables
(1) On detector (2) Consider ? 70
LB power consumption 15 W LB-Box 250 W (13/15
2CB)
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HV Endcap
Each endcap consists of
RE4
TOT
RE3
RE2
RE1
station
90
468
90
90
108
Chambers
756
180
180
180
216
HV ch.
180
794
180
216
LV ch.
216
45 (23)
189 (100)
45 (23)
45 (27)
54 (27)
RDB (HV) RDB (LV)
Crates
6 (5)
7 (6)
6 (5)
6 (5)
25(21)
3 (2)
9 (8)
racks
2 (2)
2 (2)
2 (2)
1 SY1527/End Cap
Assuming 8 (10) RDB/crate
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HV and LV power requirements
EndCaps
2 LV channels (AD) -gt 3 or 4 FEBs LV working
value/channel 7 V Analog current /channel
0.56 A ? 4.0 W Digital currennt/channel 1.04 A
? 7.2 W
HV working voltage/channel 10 kV Working
Current 0.1 mA/channel 2 HV channels / Chamber
RE4
TOT
RE3
RE2
RE1
station
902
756
902
902
1082
chambers
1512
1802
1802
1802
2162
HV ch.
1802
1588
1802
2162
2162
LV ch.
360
1512
360
360
432
HV expected power consumption (W)(1)
864 1.5k
864 1.5k
720 1.3k
720 1.3k
9.0 k
LV expected power consumption (W)(1)
Power/rack (W)(2)
2000
2000
2000
2000
(2) Assuming ? 70
(1) Dissipated on detector
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Crate Rack count in USC zone

• 2 racks for RPC Barrel
• 2 racks for RPC End Caps

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Racks positioning, cooling and cables connectivity

• RPC power supply are fully water cooled. They do
  not need any air cooling. The cool plate is on
  the back of the unit.
• RPC power supplies are connected only from the
  front panel, as the back panel is blocked by
  cable gangways and cooling plate.
• DT LV power supply will be fully water cooled
  same as RPC.
• DT LV PS are only connected from the front panel.
• DT HV power supplies need to be air cooled,
  because this unit is made under old
  specifications and it is too late to modify them
  now. In any case the power dissipated is low.
• DT HV have connectors both on the front and on
  the rear panel.

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YB 0
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YB1 / YB-1
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YB2 / YB-2
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RPC Power supply system requirements and system
description I

• The idea of the HV-LV system for the RPC detector
  of the LHC experiments is to split the system in
  two
• LOCAL SY1527 mainframes placed in control room
  and a 48 Volts High Power Source
• REMOTE distribution system placed in the UXC
  zone around the detector. It consists of a 6U
  custom crate housing 2 independent Controllers
  and up to 8 distribution board (RDB) equipped
  with 4 HV 8 LV floating channels.
• The system will work in very hard conditions due
  to the high magnetic field and high radiation
  environment.
• A common project (SASY 2000) to implement this
  system is going on between the I.N.F.N. and the
  CAEN company.

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RPC Power supply system requirements and system
description II

• LOCAL the SY1527 mainframe will host up to 16
  Branch Controller
• Each Branch Controller will manage up to 16
  Remote Distribution Board
• REMOTE each RDB will have
• 4 HV (12KV1mA) and 8 LV (7V 2A) channels
• 2 HV connectors carrying out 4 HV channels
• 2 LV connectors carrying out 8 LV channels
• All channels are floating (reduce noise).
• Will occupy 2 slots
• The remote crate having 21 slots, will host
• One Control Board (1 slot) plus up 10 RDBs
• or two CB plus up 8 RDBs

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HV test bench system

• Step-by-step DC motor
• Electrical switch
• High voltage resistors
• RS232 serial interface
• PC with LabView running
• Current measurements vs different loads and
• High Voltage values

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HV-LV power supply system

• The HV-LV project will be discussed at INFN in
  Feb 2003 (budget is already been allocated) the
  financing for total project should be approved
• The production of final prototype will start in
  1st half of 2003
• Validation tests will follow
• Production will start beginning of 2004

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RPC Cabling summary Signal cable specifications

• Signal Cables (two candidates)
• Loose pair round and twisted pairs (with flat
  zone for crimping connector) (made by Amphenol
  or 3M)
• Round and twisted pairs (no flat zone) (made by
  Kabelwerk)
• The choice will depend on easiness of
  manufacturing
• Kabelwerk more flexibilty on length

Best choice
9904 cables to be prepared
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Kabelwerk cable jitter characteristics

• Measurements of propagation time
• Comparison with Ericson and Optima cables
• Use ECL pulses 50 ns TDC 0.1 ns/bin 1000
  pulses
• Find arrival time at same pair t 0.06 ns
• Find for propagation time and pair-to-pair
  differences
• Propagation time (ns for 150 m) 501.4 1.0 ns

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Amphenol jitter characteristics
Delay measurement Amphenol cable (round and
twisted with flat zones) (SCEM 04.21.22.740.1)
Length 10 m 20 m (LVDS signals)
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HV Cable characteristics

• Suitable to sustain up to 20 kV
• Cable characteristics
• According CERN safety instruction IS 23
• Single conductor-? 0.16 mm
• Conductor resistance _at_ 20C 147 ?/Km
• Core-? 3 mm
• Screen wire-?0.2 mm (for 10 conductors)
• Overall diameter 8.4 mm (for 3 conductors)
• Price 1050 /Km (for 10 Km and 3 conductors
  cable)

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LV cable requirements

• 8 conductors cable (? 0.8 mm2 ? 20 AWG)
• Rated current/conductor 3A
• Aluminium/mylar shield
• Sheath made by LSZH flame retardant and fire
  resistant material, halogene and sulphour free
  specification requested by CERN Safety
  Instruction IS23 (coloured in blue as requested)
• Total cable diameter 8 mm
• prize 1 /mt.
• Connector MOLEX Molex Microfit-Fit 3,0
  43025-1200
• Connector prize lt 1.5 /piece (case plus
  contacts)
• Mounting and testing 2 /piece

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Cables length specification (Wheel 0/ Z-)
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Cabling commissioning

• For the end of the year, we are ready to order
  for the wheel 0
• HV cable
• LV cable
• DCS cable
• Signal cable is not included in our budget
• Optical fibers are in the trigger budget
• Labeling cables (ID, Ser.Numb.) will be provided
  as required and a proper DB will be given (job in
  progress)

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Considerazioni dopo la Electronics Week

• Calcolo della lunghezza dei cavi
• Continuare lavoro intrapreso e consegna Febbraio
  2003 al Gruppo Integrazione CERN lunghezze per
  tutte le ruote (fibre, labelling, raggi di
  curvatura)
• Discussione sul cavo segnale
• Calcolo dissipazione sui cavi
• Ordini da intraprendere su cavi HV ed LV
• Numero dei crates e dei racks cosa serve per il
  DCS degli RPC?
• Azioni da intraprendere per il sistema HV/LV.
• Raffreddamento crate HV/LV necessario partire
  studio crate remoto in collaborazione con CAEN è
  importante dal punto di vista dellintegrazione.
• Power Generators 48 V (sono da inserire nel
  budget?)

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Considerazioni dopo la Electronics Week

• Il DCS richiede un impegno in termini di presenza
  alle riunioni e di reale coinvolgimento delle
  persone cè bisogno di ulteriori risorse?
• Necessario un project plan
• Hardware integration
• Software integration
• Sviluppo del sottosistema (HV, LV, calibration
  system, cooling, racks and crates, etc.)
• Cosa realmente serve per poter runnare
  indipendentemente, allinizio esperimento?
• Necessario un installation plan
• Patch panel
• Fibre ottiche
• Numero di PC necessari
• Necessaria una costante interazione con i
  polacchi