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.