October 2001 Module Construction meeting 1.11.2001IEKP - Universität Karlsruhe (TH)
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Discussions on validation of Discussions on validation of irradiated irradiated MODULESMODULES
W. de Boer, F. Hartmann
IEKP - Universität Karlsruhe (TH)
October 2001 Module Construction meeting 1.11.2001IEKP - Universität Karlsruhe (TH)
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IrradiationIrradiation
• Protons in Protons in KAKA and neutrons in and neutrons in LouvainLouvain• All types (TOB, TEC, TEC1&2, TIB)
with corresponding fluences!
Only 300µm thick sensors (modules),can be irradiated to
maximum dose (1.6 x 1014 1MeV(Neq.))
else VFD~d²;Power~d³ too high!!• Present extensive tests not foreseen
for mass production
October 2001 Module Construction meeting 1.11.2001IEKP - Universität Karlsruhe (TH)
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ConditionsConditions
• Conditions:– No bias voltages!– Electronics on!– -10°C– Nitrogen atmosphere!
• Large cold box for irradiation needed !– Facilities ready!
October 2001 Module Construction meeting 1.11.2001IEKP - Universität Karlsruhe (TH)
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Measurements Measurements before before andand after irradiation after irradiation
• Pedestals• Noise• Bad strips (pinholes)• Functionality test with LED / Laser • Pulse shape
• S/N & CCE MIPs from 90Sr beta source!!for different annnealing times (benificial,reverse)
• Longterm stability @ high voltage, current, power
• Plus: sensors, electronics, mechanics, miscellaneous
October 2001 Module Construction meeting 1.11.2001IEKP - Universität Karlsruhe (TH)
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SensorsSensors
• Minimal program (individual sensor irrad. done!)• Still mandatory measurement of:
– Full depletion voltage (~d²)– Total leakage current (~d³)
Power consumption
- Strip parameters (e.g. interstrip capacitance)On a subsample of strips
(similiar to ingot pre-qualification)
October 2001 Module Construction meeting 1.11.2001IEKP - Universität Karlsruhe (TH)
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ElectronicsElectronics
• Passive component check (Resistors, capacitance ...)
• Check read/write commands via I²C of» APV,MUX/PLL,DCU
• Calibration pulses• Pipeline scan• DCU – thermistor, linearity, etc• Electronics power consumption
October 2001 Module Construction meeting 1.11.2001IEKP - Universität Karlsruhe (TH)
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MechanicsMechanics
• Microscopic images of glue-areas • Dimensions• Planarity!!
• Esp. after longterm test (high voltage, current, power)
October 2001 Module Construction meeting 1.11.2001IEKP - Universität Karlsruhe (TH)
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MiscMisc
• Electrical contacts (esp. conductive glue)• Bondings -- pull tests• Stability – GLUE• Pitch adapter• Etc.....
October 2001 Module Construction meeting 1.11.2001IEKP - Universität Karlsruhe (TH)
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Irradiation FacilityIrradiation Facility
Compact Cyclotron at Forschungszentrum Karlsruhe
• 30 MeV protons• 1000 nA• Beam spot: 2cm O• T < -10°C• Area: 20x40cm2
• Duration: 100cm2 - 15min (1 sensor, 5e13p/cm2)
October 2001 Module Construction meeting 1.11.2001IEKP - Universität Karlsruhe (TH)
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Cold BoxCold Box
• Dry N2 atmosphere at –10°C.
• Flexible box to hold sensors and/or modules!
• Simple power
lines
October 2001 Module Construction meeting 1.11.2001IEKP - Universität Karlsruhe (TH)
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ConclusionsConclusions
• Most important MODULE tests before and after irradiation:– S/N, stability @ high voltage, current, power
• Longterm!
• How many modules of which type, do we like to irradiate with protons and neutrons.