CERN Accelerating science

Article
Report number	hep-ex/0111066 ; DESY-2001-188 ; DESY-01-188
Title	A Purity Monitoring System for the H1 Liquid Argon Calorimeter
Author(s)	Barrelet, E (Paris U., VI-VII)
Publication	2002
Imprint	20 Nov 2001
Number of pages	26
Note	Comments: 26 pages, 14 figures
In:	Nucl. Instrum. Methods Phys. Res., A 490 (2002) 204-22
DOI	10.1016/S0168-9002(02)00973-7
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN SPS
Abstract	The ionization probes used for monitoring the liquid argon purity in the H1 calorimeter are described and results of their operation in tests at CERN and during the period 1992 to the end of 1998 at HERA are given. The high sensitivity of the charge measurements leads to refined charge collection models, and to the observation of a variation of the ionization yield of our electron sources with temperature.

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