Irradiation Workshop - KarlsruheA. Dierlamm, IEKP 1 Irradiation with Protons - IQC Karlsruhe IEKP - Universität Karlsruhe (TH)

Irradiation Workshop - KarlsruheA. Dierlamm, IEKP 2 Isochroncyclotron in Karlsruhe 26 MeV protons Frequency: ~33MeV Accessible within 2 days

Irradiation Workshop - KarlsruheA. Dierlamm, IEKP 3 Irradiation Area Cooling with Nitrogen gas down to -50°C Initial positioning by laser pointer Scanning with 1mm row steps (10cm/s) Used proton current: 2  A Irrad. of 120x120mm 2 up to 1e14 p/cm 2 takes 20min

Irradiation Workshop - KarlsruheA. Dierlamm, IEKP 4 During Irradiation... Cold box with proton beam spot on mylar window Scanning speed up to 250 mm/s !

Irradiation Workshop - KarlsruheA. Dierlamm, IEKP 5 Homogeneity of Scanning Scan Area Area of Interest Autoradiography picture

Irradiation Workshop - KarlsruheA. Dierlamm, IEKP 6 Fluence Estimation Beam current I in p/s Calculate ratio  of hits inside homogeneous area to total hits F = I *  * t / A homogene Get time t for irradiation Adjust speed to have integer no. of scans Teststructure

Irradiation Workshop - KarlsruheA. Dierlamm, IEKP 7 Fluence Measurement Ni foils behind teststructures in homogeneous area Measure specific activity of 57 Ni line with Ge- Spectrometer Extrapolation to activity at 3.77 days after irrad. (T 1/2 = 35.6h = days  = 2.14 days) Calibration factor for 26 MeV protons: kBq cm 2 / mg  Ah 1  Ah = 22.5e15 protons

Irradiation Workshop - KarlsruheA. Dierlamm, IEKP 8 Comparision

Irradiation Workshop - KarlsruheA. Dierlamm, IEKP 9 Speed Calculation

Irradiation Workshop - KarlsruheA. Dierlamm, IEKP 10 Current Control Beam current monitored during irradiation Data saved to disk On-line integration of current Beam and scanning automatically stopped if current out of limit (e.g. 10%) Insert aperture to get more stable low current

Irradiation Workshop - KarlsruheA. Dierlamm, IEKP 11 Biasing scheme After 10 years LHC we expect a current of upto 1µA per strip at 1M   1V potential at p-implant Bias of 1V during irrad. and both AC and biasring on ground gives 1V over diel. Used bias voltage for safety reasons (voltage drop in power lines) : 12 V

Irradiation Workshop - KarlsruheA. Dierlamm, IEKP 12 Next Irradiations Hybrid Optohybrid Module We will provide the hybrids with power, clock, I2C-pulses and reset. The module will be under bias.