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Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 2002

A Purity Monitoring System for the H1 Liquid Argon Calorimeter

E. Barrelet; B. Andrieu; A. Babaev; E. Banas; D. Bederede; P. Biddulph; K. Borras; F. Brasse; V. Brisson; P. Burmeister; G. Buschhorn; B. Canton; U. Cornett; G. Cozzika; J. Cvach; A. Cyz; D. Darvill; M. David; F. Descamps; A. Drescher; U. Dretzler; G. Ernst; G. Falley; R. Felst; J. Feltesse; J. Ferencei; W. Flauger; M. Fleischer; J. Formánek; K. Gadow

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.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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A. Drescher

Technical University of Dortmund

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D. Darvill

RWTH Aachen University

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G. Ernst

Technical University of Dortmund

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J. Cvach

Deutsche Forschungsgemeinschaft

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K. Borras

Technical University of Dortmund

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M. Fleischer

Technical University of Dortmund

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