Irradiation facilities at KIT Alexander Dierlamm for the irradiation - - PowerPoint PPT Presentation

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Irradiation facilities at KIT Alexander Dierlamm for the irradiation - - PowerPoint PPT Presentation

Mar 13, 2023 369 likes •546 views

Irradiation facilities at KIT Alexander Dierlamm for the irradiation crew INSTITUT FR EXPERIMENTELLE KERNPHYSIK Image credit: Andre Holzner KIT University of the State of Baden-Wuerttemberg and www.kit.edu National Research Center of the

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KIT – University of the State of Baden-Wuerttemberg and National Research Center of the Helmholtz Association

INSTITUT FÜR EXPERIMENTELLE KERNPHYSIK

www.kit.edu

Irradiation facilities at KIT

Alexander Dierlamm for the irradiation crew

Image credit: Andre Holzner

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SLIDE 2
  • A. Dierlamm

Institut für Experimentelle Kernphysik

The infrastructures

Available facilities:

23MeV proton cyclotron

On average 4-5h slot every second week up to 6 weeks turn-around time

60kV X-ray tube

currently heavily used, but still we can try to arrange for irrad. time

Initial contact and infos: irradiations@lists.kit.edu Description on http://www.ekp.kit.edu/english/irradiation_center.php

Irradiation facilities at KIT

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  • A. Dierlamm

Institut für Experimentelle Kernphysik

The Karlsruhe Proton Cyclotron KAZ

Run by private company ZAG Proton energy at extraction: 25.3MeV Typical proton current: 2.0µA Temperature in box: ~ -30°C Beam spot ~ 7mm (varying) Flux ~ 3x1013 p/(s·cm²)

FWHM~7mm

Sample box on XY-stage with beam line Man placing LN2 box Control room

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Irradiation facilities at KIT

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SLIDE 4
  • A. Dierlamm

Institut für Experimentelle Kernphysik

Irradiation Box

Insulated box, cooled by cold nitrogen gas Goose-necks lead gas to individual samples Graphite plate to stop protons at the back Window with two Kapton foils for insulation Samples glued on Kapton tape fixed to Al-frames, which can be fixed in the box Mounted on movable XY-stage since beam spot does not cover samples size; max. accessible area: ~ 40cm x 15cm Box positions and temperatures are logged

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  • A. Dierlamm

Institut für Experimentelle Kernphysik

Scanning Procedure

Samples are scanned in 1mm spaced rows Edge regions are inhomogeneous and a margin of ~1cm is used Proton fluence is calculated by: The proton current IP is always measured at the last beam stop At the nominal values of IP=2.0µA and vx=115mm/s we generate 4.3x1013neq/cm² per scan Fluence can be predicted to ~20% Dosimetry of Ni foil will yield a fluence measurement within ~15%

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Autoradiographic image of a large Ni-foil scanned in the described

  • procedure. The white area is a cut
  • ut for further dosimetry.
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SLIDE 6
  • A. Dierlamm

Institut für Experimentelle Kernphysik

Energy at Target

25.3MeV is the proton energy at extraction Protons have to pass several materials until they hit the samples SRIM calculations for the proton energy:

entering the samples: 23.8MeV

  • n average in the sample: 22.9MeV ( 23MeV protons quoted)

Hardness factor for p23MeV on Si: 2.0

i.e. 1x1014p/cm²  2x1014neq/cm²

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SRIM 2008.04

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  • A. Dierlamm

Institut für Experimentelle Kernphysik

Restrictions

Gluing of samples with Kapton tape

  • max. fluence: 5x1015neq/cm²

(silicone glue gets brittle) Possibly remnants on the samples, which should be removable with acetone, isopropanol or a sticky tape

We cannot book irradiation time weeks before.

On Mondays the plan of the week is made and if there is a free slot we can get it Usually, we can get one session (~5h) per week We handle the projects in FIFO mode; so send samples asap

Materials possibly only silicon with aluminum

auxiliary electronics/components/metal traces should be covered by an Al99.5 mask

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SLIDE 8
  • A. Dierlamm

Institut für Experimentelle Kernphysik

Shipment

Samples can be shipped to us and we do the rest Most of the samples need to be kept cold after irradiation

they are immediately stored in a freezer after irradiation you need to supply an insulating box with ice packs / dry ice

Shipment is done after a deactivation time of ~ 1 week and consecutive dosimetry

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  • A. Dierlamm

Institut für Experimentelle Kernphysik

Scientific outcome

Could count 61 user publications since 2008 of which 27 since 2013 Please, let us know when you submit a publication!

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…

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  • A. Dierlamm

Institut für Experimentelle Kernphysik

Examples: planar strip sensors

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2013 JINST 8 C01001 NIM A612(2010)470–473

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  • A. Dierlamm

Institut für Experimentelle Kernphysik

Examples: 3D sensors

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NIM A659(2011)272–281

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  • A. Dierlamm

Institut für Experimentelle Kernphysik

Examples: electronics

Transistors Read-out ASICs HV-CMOS …

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HV Transistors

http://smwang.web.cern.ch/smwang/ ITK_sep14_web/HV_update.pdf http://dx.doi.org/10.1016/j.nima.2015.09.004 indico.cern.ch/event/ 357738/session/5/ contribution/74

HV-CMOS Pixel ROC

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SLIDE 13
  • A. Dierlamm

Institut für Experimentelle Kernphysik

Application

First contact us and discuss your project: irradiations@lists.kit.edu If you are eligible to apply for AIDA-2020 funds you should fill out an application form and follow these instructions: http://aida2020.web.cern.ch/content/how-apply-transnational-access You can also directly pay us for an irradiation project… For AIDA funded projects please do not forget to add an AIDA-2020 acknowledgement to you publication:

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  • Pub. long:
  • Pub. short:

Presentation:

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SLIDE 14
  • A. Dierlamm

Institut für Experimentelle Kernphysik

X-Ray setup

  • max. voltage: 60kV
  • max. current: 30mA

beam spot diameter ~ 2cm dose rate (SiO2): <2Gy/s feed-through for test equipment

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X-ray setup with laser alignment and camera

NIM A675(2012)118–122

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  • A. Dierlamm

Institut für Experimentelle Kernphysik

Examples: Pixel calibration

Fluorescence targets for energy calib. Intensity scan for rate dependence

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IEKP-KA/2013-21

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  • A. Dierlamm

Institut für Experimentelle Kernphysik

Conclusion

If you are planning an irradiation

please talk to us: irradiations@lists.kit.edu

We are ready…

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https://en.wikipedia.org/wiki

  • M. Stanley Livingston and Ernest O. Lawrence (right) in front of Lawrence's

69 cm (27 in) cyclotron at the Lawrence Radiation Laboratory. The curving metal frame is the magnet's core, the large cylindrical boxes contain the coils

  • f wire that generate the magnetic field. The vacuum chamber containing the

"dee" electrodes is in the center between the magnet's poles. Taking an X-ray image with early Crookes tube apparatus, late 1800s. The Crookes tube is visible in center. The standing man is viewing his hand with a fluoroscope screen. No precautions against radiation exposure are taken; its hazards were not known at the time.

Cyclotron X-rays