Status of Embedded Local Monitor Board ELMB

1
Status of Embedded Local Monitor Board(ELMB)

• Overview
• Radiation tolerance measurements
• Future work

2
What is the ELMB ?

• I/O concentrator implemented as CAN fieldbus node
• Features
• 8 ports input
• 8 ports output
• 8 ports definable
• ADC, 64 channels, 16 bit resolution, 7 bit gain
• Add-ons
• DAC, 16 channels, 12 bit resolution (NIKHEF)
• HW Interlock, 16 channels, window set by
  resistors (Wuppertal)
• Motherboard (NTU Athens)
• Goal flexible I/O system for use in ATLAS
  cavern outside the calorimeter (i.e. Muons)

3
Status ELMB

• Design HW CERN SW NIKHEF
• Prototype LMB
• Review (subdetector wishes, radiation tolerance)
• ELMB
• prototype 20 pieces
• production 300 pieces (with help from EP/ESS, NTU
  Athens)
• pre-qualification measurements concerning
  radiation

4
ELMB front side
ISP
50mm
DIP-SW ID BAUD
67 mm
5
ELMB back side ADC
ADC
Analog MUX
250 pin Bergstac connector
6
ELMB ADC
1uV
7
ELMB ADC
8
ELMB3 motherboard for tests in DIN rail housing
9
Back side of MB3
10
Radiation Measurements

• Total Ionisation Dose (TID)
• PAGURE, Saclay, Co60 (1 MeV gammas)
• GIF, CERN, Cs137 (662 keV gammas)
• CYCLONE, Louvain-la-Neuve, 60 MeV protons
• Single Event Effects (SEE)
• CYCLONE, Louvain-la-Neuve, 60 MeV protons
• Non-Ionising Energy Loss (NIEL)
• PROSPERO, Valduc, 0.75 MeV neutrons from reactor
• Measurements in the Field
• TCC2 target area, CERN SPS, realistic (?) mix of
  particles

11
TID tests
12
Accelerated ageing test
13
TID effects
14
NIEL test Prospero
15
SEE effects SRAM
16
SEE Results Memories
No of bits tested No of errors Cross-section
cm2/bit SRAM 16384 2320
4.310-13 EEPROM 28672 lt1
lt1.110-16 FLASH 1048576 lt1
lt2.910-18 CAN reg. 320 23
2.210-13 ADC reg. 264 22 2.510-13
No errors were found in Flash memory and EEPROM!
17
Radiation Requirements
SEE category / Symptoms Error recovery Maximum
allowed rate Soft SEE/ Data readout
errors Automatic 1 per 10 min per CAN
branch Soft SEE / CAN node hangs Software
reset 1 per 24 h per CAN node Soft SEE / CAN
branch hangs Power cycling 1 per 24 h per CAN
branch Hard SEE / Permanent error Replace
ELMB 1 per months for 3000 ELMBs Destructive SEE
/ Damage Power limitation Not allowed
18
Results
19
Summary Radiation Tolerance

• Radiation pre-qualification finished
• DCS IWN 9-12
• Summary paper given at the 7th Workshop on
  Electronics for LHC Experiments, Stockholm,
  Sweden, September 2001
• Subdetectors have to decide, where to use ELMB
• e.g. Muons, Assessment of Electronics
  Coordination
• SEE looks ok, more precaution (SW) and automatic
  recovery needed
• NIEL looks ok
• TID at the limit, study position of ELMB on some
  chambers EC1

20
Need

• Envisaged usage of ELMB
• standard use (with ADC)
• MDT 1200
• infrastructure and other subdetectors 1000
• other LHC experiments ???
• special use (w/o ADC, special SW)
• TGC 1000
• RPC 1000

21
Estimated Cost

• Quantity 300 pc 4000 pc
• Microcontroller 70 50
• ADC 50 40
• 120
  90
• Overhead 30? 40 30
• Total 160
  120
• Catalog price (1pc) 320 (gt1k) 160

22
Next Steps (1)

• Work to do
• simplify PCB (8 gt 6 layers)
• cabling/powering of full branch
• automatic detection of and recovery from SEE
• Final connection to SCADA PVSS
• HW interface card
• SW OPC, driver
• Distribution of functions (see DCS-IWN 13)

23
Next Steps (2)

• Procurement
• production in industry (allow 1-2 years !!!)
• Market Survey procedure has been started
• Tendering, need commitments (pledges !) from
  ATLAS institutes
• pre-series of 500-1000 next year (not for UX)
• final series 2003/2004 (?)
• Combined/separate production of ELMB with and w/o
  ADC ?
• Support by the CERN electronics pool
• Probably a shortage of ELMBs next year !