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Featured researches published by C. Niebuhr.


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.


Archive | 2011

Measurement of D ∗± meson production and determination

C. Alexa; V. Andreev; S. Backovic; A. Baghdasaryan; S. Baghdasaryan; E. Barrelet; W. Bartel; A. Belousov; V. Boudry; I. Bozovic-Jelisavcic; J. Bracinik; Gerhard Brandt; M. Brinkmann; V. Brisson; D. Bruncko; A. Bunyatyan; G. Buschhorn; L. Bystritskaya; F. Ceccopieri; L. Goerlich; N. Gogitidze; M. Gouzevitch; C. Grab; A. Grebenyuk; T. Greenshaw; G. Grindhammer; Shiraz Habib; D. Haidt; C. Helebrant; E. Hennekemper


Archive | 2010

Prompt photons in photoproduction at HERA The H1 Collaboration

M. Aldaya Martin; C. Alexa; V. Andreev; B. Antunovic; S. Backovic; A. Baghdasaryan; E. Barrelet; W. Bartel; A. Belousov; V. Boudry; I. Bozovic-Jelisavcic; J. Bracinik; G. Brandt; M. Brinkmann; V. Brisson; D. Bruncko; A. Bunyatyan; G. Buschhorn; L. Bystritskaya; K. Cerny; V. Cerny; A. Cholewa; G. Cozzika; J. Cvach; K. Daum; B. Delcourt; M. Del Degan; C. Diaconu; V. Dodonov; A. Dubak

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V. Brisson

University of Paris-Sud

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J. Bracinik

University of Birmingham

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W. Bartel

University of Glasgow

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C. Alexa

Politehnica University of Bucharest

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A. Belousov

Lebedev Physical Institute

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V. Andreev

Petersburg Nuclear Physics Institute

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