Aging studies for the ATLAS monitor drift tubes using alpha particles

Author

Sampsonidis, D. ; Manolopoulou, M. ; Petridou, Ch ; Liolios, A.

Author_Institution

Aristotelian Univ. of Thessaloniki, Greece

Volume

5

fYear

2003

fDate

19-25 Oct. 2003

Firstpage

3719

Abstract

A systematic study of the behavior of the ATLAS monitored drift tubes (MDTs) under controlled irradiation by alpha particles has been performed. The aim of the study was two fold: to quantify the response of the tubes to alpha particles and consequence to heavily ionizing particles and to measure aging effects under the nominal operating conditions. A setup of a well controlled radium (²²⁶Ra) source was used in order to enrich the tube gas (Ar, CO₂) with the alpha emitter ²²²Rn and irradiate the tubes internally. The ionization produced by an alpha particle with mean energy of 6.4 MeV has been measured. The energy deposition of the alpha and beta rays of the source inside the tube was computed by simulating the MDT geometry and the accumulated charge to the tube wire at operating conditions was calculated. The results of aging effects up to an accumulated charge of 41.5 mC are given by using the alpha-irradiation setup.

Keywords

ageing; alpha-particle effects; drift chambers; position sensitive particle detectors; 6.4 MeV; ²²²Rn; ²²⁶Ra; ATLAS monitored drift tubes; Ar; CO₂; MDT geometry; accumulated charge; aging effects; alpha emitter; alpha particles; alpha-irradiation setup; beta rays; controlled irradiation; controlled radium source; energy deposition; heavily ionizing particles; mean energy; nominal operating conditions; tube gas; tube response; tube wire; Aging; Alpha particles; Argon; Beta rays; Computational modeling; Control systems; Energy measurement; Ionization; Monitoring; Particle measurements;

fLanguage

English

Publisher

ieee

Conference_Titel

Nuclear Science Symposium Conference Record, 2003 IEEE

ISSN

1082-3654

Print_ISBN

0-7803-8257-9

Type

conf

DOI

10.1109/NSSMIC.2003.1352714

Filename

1352714