CSC Electronics

Radiation assuranceP. O’Connor, BNL

Y. Li, UCI

Dec. 1, 2000

CSC Electronics•precision forward muon chambers

•32 chambers at Z ~ 7m, R ~ 1 to 2 m

-electronics mounted on the chamber

On-chamber electronics location

CSC On-chamber electronics

• Amplifiers, analog memory, digitizer, fiber optic links

• 192-channel “ASM-PACK”

Simulated Radiation Levels

TID

(Gy/10yr)

NIEL

(1 MeV n/cm2/10yr)

SEE

(>20 MeV h/cm2/10yr)

126 5.4e12 1.2e12

CSC Electronics reliability

• Radiation qualification is part of overall reliability strategy

• Goal: < 0.1% data lost due to hard or soft fails• Strategy: on-detector electronics boards must be as simple and robust as possible         Minimal parts list: see next slide         All intelligence to reside off-chamber (sparsifier/ROD)         ASM-PACK to have no

• Configuration registers• Programmable logic• FIFOs• RAM• Counters• State machines

        Thorough radiation test of all components         ESD protect inputs at board and chip level         ATLAS policy on grounding and shielding         Extra attention to amplifier stability         No DCS• Minimal monitoring

ASM-PACK components

• Preamp/shaper – custom CMOS ASIC• SCA – custom DMILL ASIC*• Op-amp*• Voltage regulators*• 12-b ADC*• PECL translator*• G-link transceiver*• G-link serializer*• G-link deserializer• Multiplexer

* These components common to LAr and CSC systems

Electronics qualification status• Majority of components are common with LAr

• SRL’s are similar to LAr

• Rad qualification of these components to be done jointly– already much progress from LAr groups

• Preamp/shaper shows encouraging TID results to 1 Mrad (see next slide)

• Other critical component is G-link receiver– SEE test set being constructed at UCI

– Tests expected to start in Q1-2001

• Multiplexer – beginning to prototype with FPGAs, still have to choose rad-tolerant technology (discrete shift registers or ASIC)

Preamp/shaper 60Co irradiation resultsSupply current Gain

Noise Waveform

Optical link qualification

• Receiver qualification is critical for CSC readout scheme

• Acceptable SEU rate determined based on expected link sync loss behavior

• Proton facility at UC Davis identified

• All hardware designed, fabricated, and partially debugged

• All software (Labview) written

• Optical components ready

• 2 long and 3 short cables being assembled

ASM-2 prototype