Change search
ReferencesLink to record
Permanent link

Direct link
Radiation tests of semiconductor detectors
KTH, School of Engineering Sciences (SCI), Physics.
2006 (English)Doctoral thesis, monograph (Other scientific)
Abstract [en]

This thesis investigates the response of Gallium Arsenide (GaAs) detectors to ionizing irradiation. Detectors based on π-υ junction formed by deep level centers doping. The detectors have been irradiated with 137Cs γ-rays up to 110 kGy, with 6 MeV mean energy neutron up to approximately 6 · 1014 n/cm2, with protons and mixed beam up to 1015 p/cm2. Results are presented for the effects on leakage currents and charge collection efficiencies for minimum ionizing electrons and alpha particles. The signal from minimum ionizing electrons was well separated from the noise even after the highest delivered exposures and the diodes are thus still operational as detectors. Saturation of the effects of radiation damage is observed in both the I-V characteristics and charge collection efficiency measurements.

The requirements for detectors e.g. at present and planned hadron colliders is very high in terms of radiation hardness. Detectors for tracking applications close to the interaction point will receive charged particle doses in the range of 110 kGy and fast neutron fluences of 1014 n/cm2 during the lifetime of an experiment. In this thesis it is confirmed that GaAs detectors are radiation resistant to neutron irradiation for fluences up to 1015 n/cm2 and that GaAs detectors are feasible as inner trackers. Most of this work was performed in the framework of the RD8 collaboration at CERN.

Place, publisher, year, edition, pages
Stockholm: KTH , 2006. , 102 p.
TRITA-FYS, ISSN 0280-316X ; 2006.45
Keyword [en]
radiation physics, materials science
National Category
Subatomic Physics
URN: urn:nbn:se:kth:diva-4026ISBN: 91-7178-401-2OAI: diva2:10452
Public defence
2006-06-14, Sal FB53, AlvaNova univ centrum, Roslagstullsbacken 21, Stockholm, 13:30

QC 20100920

Available from: 2006-06-02 Created: 2006-06-02 Last updated: 2014-09-24Bibliographically approved

Open Access in DiVA

fulltext(2486 kB)1987 downloads
File information
File name FULLTEXT01.pdfFile size 2486 kBChecksum MD5
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Chmill, Valery
By organisation
Subatomic Physics

Search outside of DiVA

GoogleGoogle Scholar
Total: 1987 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 596 hits
ReferencesLink to record
Permanent link

Direct link