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Summer Student Presentation. Radiation Monitoring with commercial p-i-n diodes BPW34F Summer Student Project of Kim Temming Supervisors: Michael Moll Maurice Glaser. Outline. purpose of my project diode BPW34F / BPW 34 how to measure radiation with this diodes?

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Summer student presentation l.jpg

Summer Student Presentation

Radiation Monitoring

with commercial

p-i-n diodes

BPW34F

Summer Student Project of Kim Temming

Supervisors: Michael Moll

Maurice Glaser

By Kim Temming


Outline l.jpg
Outline

  • purpose of my project

  • diode BPW34F / BPW 34

  • how to measure radiation with this diodes?

  • history of my measurements

    • irradiations

    • first setup

      • measurements / results

      • problems

    • new setup

      • measurements

      • first results

      • problems

  • first conclusions

  • outlook

Summer Student Presentation Kim Temming


Purpose of my project l.jpg
Purpose of my Project

  • investigate the possibility to use commercial BPW 34 p-i-n

    diodes as dosimeters for LHC experiments and irradiation

    facilities

  • advantages

    • commercial product: low costs (1.60 €)

    • robust and easy to handle

    • large fluence range (1012 – 1015 p/cm2)

    • measuring NIEL (displacement damage)

  • disadvantages

    • needs qualifying

      • temperature & fluence dependence

      • annealing

      • readout scheme

    • commercial product (no influence on production)

Summer Student Presentation Kim Temming


Diode bpw34f bpw34 l.jpg
Diode BPW34F / BPW34

  • commercial SI-pin-diode / cheap

  • BPW34 photosensitive from 400nm to 1100nm

    (BPW34F: 950nm)

  • applications:

    • IR remote controls

    • photointerruptors

    • control and drive circuits

BPW34

-

photosensitive area

+

BPW34F

Summer Student Presentation Kim Temming


How to measure radiation l.jpg
How to measure radiation?

  • increase of voltage with fluence for constant current when biased in forward direction

Summer Student Presentation Kim Temming


My work irradiations l.jpg
My Work: Irradiations

  • 102 diodes were irradiated with 24 GeV/c PS proton beam

    • 50 BPW34F from USA

      • 1.0 E15, 0.5 E14, 0.3 E14, 1.0 E14, 0.5 E13, 0.3 E13,

        1.0 E13, 0.5 E12, 0.3 E12, 1.0 E12 (all in p/cm2)

    • 22 BPW34F from MALAYSIA

      • 1.0 E15 ppcm2, 1.0 E14 p/cm2

    • BPW34 Siemens, BPW34 Osram and BPW34FS

      • each 5 pieces 1.0 E13 p/cm2

      • each 5 pieces 1.0 E14 p/cm2

  • irradiations successful in

    limits of 20% discrepancies

    to wanted fluence

    (+ca. 8% errors on values)

Summer Student Presentation Kim Temming


First setup l.jpg
First Setup

  • aluminium box / completely dark

  • (diodes are sensitive to daylight!)

  • Keithley 2400

    • set current / read voltage

  • sensor for temperature

    • inside box / 2 cm beside diode

    • sensitivity: 0.1 degree celsius

  • labview program

    • option for constant current

    • option for pulsed current

    • displays graph:

voltage

time

Summer Student Presentation Kim Temming


Measurements results first setup l.jpg
Measurements / results first setup

  • VI measurements of all samples before irradiation

    • current between 0.1 A and 1 mA

  • results of VI measurements before irradiation:

    • nearly all samples show same characteristic

    • all differences between samples become larger with

      higher current

  • samples from Siemens:

    • old (some years)

    • vary more than 20%

samples

siemens

Summer Student Presentation Kim Temming


Measurements results first setup9 l.jpg
Measurements / results first setup

  • dependence of the voltage on readout frequency and

    readout pulse length

    • 10 samples together irradiated with 1.0 E14 protons/cm2

    • applied current: 1 mA

    • pulse length varying between 1 ms and 1 s

    • pulse to pulse time between 60 s and 3 s

  • Results of dependence on readout frequency & pulse length

    • not very sensitive

      to pulse length

      (except of constant current)

    • not at all sensitive to

      time between pulses

    • but differences of more

      than 20 % between the

      different diodes

Summer Student Presentation Kim Temming


Measurements results first setup10 l.jpg
Measurements / results first setup

  • dependence on readout current

    • ONE diode irradiated with 1.0 E14 protons/cm2

    • pulse to pulse 3 s, pulse length varying

    • current varying between 1 A and 100 mA

  • Results of dependence on readout current

Summer Student Presentation Kim Temming


Problems of first setup l.jpg
Problems of first setup

  • diodes are very sensitive to temperature

    • measured voltage depends very much on the temperature

      of diode

    • temperature is measured 2 cm away from diode /

      isolated by plastic and air

    • possible sources of temperature differences

      • changes of room temperature (air condition!)

      • touching of diodes

      • opening of box

  • another possible explanation:

    diodes show peltier effect

    • cooling down by applying current

  • necessary to control temperature

    of diode very exactly

Summer Student Presentation Kim Temming


New setup l.jpg
New setup

  • peltier element below socket of diode regulates

    temperature of diode to exactly 19.3  0.01 degree celsius

  • temperature read out by small temperature sensor

    (operated with Keithley 2410)

  • readout of diode still with Keithley 2400

  • temperature displayed on web with webDAQ/100

Summer Student Presentation Kim Temming


Measurements with new setup l.jpg
Measurements with new setup

  • ONE diode irradiated with 1.0 E14 protons/cm2

    • always same end value with constant current

    • first no room temperature effects (outside box) visible

      because of the good temperature shielding

  • over night / weekend measurements

    • irradiated diode

    • non irradiated diode

    • very temperature stable resistor

  • measurements:

    • applied current: 100A, constant current

    • temperature measured inside and outside the box with 2

      digits

    • voltage measured with labview-program and Keithley

      2400

Summer Student Presentation Kim Temming


First results new setup l.jpg
First results (new setup)

  • irradiated diode: voltage still depending on temperature

    but very sensitive

  • not irradiated diode:

    same results but

    less amplitude

  • 1 k Ohm resistor

Summer Student Presentation Kim Temming


Problems of temperature keithleys l.jpg
Problems of temperature / Keithleys

  • not completely clear yet:

    • effect of temperature in diode?

    • effect of room temperature in Keithleys?

      • limit of keithley accuracy!

Summer Student Presentation Kim Temming


First conclusions l.jpg
First conclusions

  • before irradiations:

    • all diodes very close together, only few discrepancies on readout voltage

  • after irradiation:

    • diodes show discrepancies of up to 20% on readout voltage

    • diodes very temperature sensitive

    • temperature needs to be controlled

  • best readout scheme:

    • current: 100 A

    • pulse length: 1 ms

    • pulse to pulse: ~ 3s (not very sensitive)

Summer Student Presentation Kim Temming


Outlook l.jpg

End

Outlook

  • continue measurement

    • more different devices (to get statistics)

    • more sensitive temperature control

  • dependence on the readout temperature

    • for fluences 1.0 E12...E15 p/cm2

    • from –10 C to +30 C

  • dependence on the fluence

    • 1.0 E12 p/cm2 up to 1.0 E15 p/cm2

  • annealing of samples in oven

    • 40, 60. 80, 100 degree celsius

Summer Student Presentation Kim Temming


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