Charge amplitude distribution of the Gossip gaseous pixel detector
| Autor: | V. Gromov, P. Colas, R. Kluit, J. Timmermans, M. Chefdeville, H. van der Graaf, Cora Salm, Fred Hartjes, Els Koffeman, Jan Visschers, V.M. Blanco Carballo, Y. Giomataris, Jurriaan Schmitz, Sander M. Smits |
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| Přispěvatelé: | ATLAS (IHEF, IoP, FNWI) |
| Jazyk: | angličtina |
| Rok vydání: | 2007 |
| Předmět: |
Physics
Nuclear and High Energy Physics Large Hadron Collider Pixel Interaction point business.industry Physics::Instrumentation and Detectors MicroMegas detector Electron Charge signal distribution Signal Charged particle METIS-245877 Optics MICROMEGAS SC-RID: Radiation Imaging detectors Particle EWI-11608 Cluster density Gaseous detector IR-62068 business Instrumentation |
| Zdroj: | Nuclear Instruments & Methods in Physics Research Section A-Accelerators Spectrometers Detectors and Associated Equipment, 583(11), 42-48. Elsevier Nuclear instruments & methods in physics research. Section A : Accelerators, spectrometers, detectors and associated equipment, Volume 583(1/issue 1):10.1016/j.nima.2007.08.199, 42-48. Elsevier |
| ISSN: | 0168-9002 |
| DOI: | 10.1016/j.nima.2007.08.199 |
| Popis: | The Gossip gaseous pixel detector is being developed for the detection of charged particles in extreme high radiation environments as foreseen close to the interaction point of the proposed super LHC. The detecting medium is a thin layer of gas. Because of the low density of this medium, only a few primary electron/ion pairs are created by the traversing particle. To get a detectable signal, the electrons drift towards a perforated metal foil (Micromegas) whereafter they are multiplied in a gas avalanche to provide a detectable signal. The gas avalanche occurs in the high field between the Micromegas and the pixel readout chip (ROC). Compared to a silicon pixel detector, Gossip features a low material budget and a low cooling power. An experiment using X-rays has indicated a possible high radiation tolerance exceeding 1016 hadrons/cm2.The amplified charge signal has a broad amplitude distribution due to the limited statistics of the primary ionization and the statistical variation of the gas amplification. Therefore, some degree of inefficiency is inevitable. This study presents experimental results on the charge amplitude distribution for CO2/DME (dimethyl-ether) and Ar/iC4H10 mixtures. The measured curves were fitted with the outcome of a theoretical model. In the model, the physical Landau distribution is approximated by a Poisson distribution that is convoluted with the variation of the gas gain and the electronic noise. The value for the fraction of pedestal events is used for a direct calculation of the cluster density. For some gases, the measured cluster density is considerably lower than given in literature. |
| Databáze: | OpenAIRE |
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