Charge transfer and charge broadening of GEM structures in high magnetic fields
Martin Killenberg,S. Lotze,J. Mnich,A. Münnich,S. Roth,F. Sefkow,M. Tonutti,Max Weber,Peter Wienemann +8 more
TL;DR: In this paper, a small test chamber has been installed in the aperture of a superconducting magnet with the GEM structures mounted perpendicular to the B -field direction, and charge transfer is derived from the electrical currents monitored during irradiation with an 55 Fe source.
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Abstract: We report on the measurements of charge transfer in Gas Electron Multipliers (GEM) structures in high magnetic fields. These were performed in the framework of the R&D work for a Time Projection Chamber at a future Linear Collider. A small test chamber has been installed in the aperture of a superconducting magnet with the GEM structures mounted perpendicular to the B -field direction. The charge transfer is derived from the electrical currents monitored during irradiation with an 55 Fe source. No significant loss of primary ionisation charge is observed, and an improved ion feedback suppression is achieved for high magnetic fields. Additionally, the width of the charge cloud released by individual 55 Fe photons is measured using a finely segmented strip readout after the triple GEM structure. Charge widths between 0.3 and 0.5 mm RMS are observed, which originate from the charge broadening inside the GEM amplification. This charge broadening is only partly suppressed at high magnetic fields.
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Citations
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Precision Meson Spectroscopy: Diffractive Production at COMPASS and Development of a GEM-based TPC for PANDA
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TL;DR: In this paper, the authors presented a partial wave analysis based on data of the COMPASS experiment at CERN, which exhibits a strong evidence for a hybrid candidate with spin-exotic quantum numbers and a mass of 1.660 + 0.010 - 0.074 GeV.
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Data acquisition methods for GEM detectors
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References
GEM: A new concept for electron amplification in gas detectors
TL;DR: The gas electrons multiplier (GEM) as discussed by the authors is a composite grid consisting of two metal layers separated by a thin insulator, etched with a regular matrix of open channels, inserted in a gas detector on the path of drifting electrons.
2.1K
Modelling and measurement of charge transfer in multiple GEM structures
M. Killenberg,S. Lotze,J. Mnich,S. Roth,Reinhard W. Schulte,B. Sobloher,W. Struczinski,M. Tonutti +7 more
TL;DR: In this paper, a small test chamber has been constructed and operated with up to three GEM foils and the charge transfer parameters derived from the electrical currents monitored during the irradiation with an 55 Fe source are compared with numerical simulations.
49
Cryogenics for a 5 Tesla Superconducting Solenoid with Large Aperture at DESY
E. Gadwinkel,H. Herzog,H. Lierl,D. Notz,J. Schaffran,B. Schoeneburg +5 more
- 16 Jul 2004
TL;DR: In this article, a superconducting solenoid magnet with fields up to 5.25 Tesla is used to measure prototype time projection chambers foreseen as detectors for a future high energy physics collider experiment.
5
A multiterm Boltzmann analysis of drift velocity, diffusion, gain and magnetic-field effects in argon-methane-water-vapour mixtures
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