dorsal/arxiv
View SchemaIon backflow in the Micromegas TPC for the future linear collider
| Authors | P. Colas, I. Giomataris, V. Lepeltier |
|---|---|
| Categories | |
| ArXiv ID | physics/0412057 |
| URL | https://arxiv.org/abs/physics/0412057 |
| DOI | 10.1016/j.nima.2004.07.274 |
| Journal | Nuclear Instruments and Methods in Physics Research A 535 (2004) 226-230 - Conference: Xth Vienna Conference on Instrumentation (2004-02-16 to 2004-02-21), Vienne (at) |
Abstract
We present ion backflow measurements in a Micromegas (MICRO-MEsh GASeous detector) TPC device developed for the next high energy electron-positron linear collider under study and a simple explanation for this backflow. A Micromegas micro-mesh has the intrinsic property to naturally stop a large fraction of the secondary positive ions created in the avalanche. It is shown that under some workable conditions on the pitch of the mesh and on the gas mixture, the ion feedback is equal to the field ratio (ratio of the drift electric field to the amplification field). Measurements with an intense X-ray source are in good agreement with calculations and simulations. The conclusion is that in the electric field conditions foreseen for the Micromegas TPC (drift and amplification fields respectively equal to 150-200 V/cm and 50-80 kV/cm) the expected ion backflow will be of the order of $2 - 3 x 10^-3$. In addition, measurements have been done in a 2T magnetic field: as expected the ion backflow is not altered by the magnetic field.
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"abstract": "We present ion backflow measurements in a Micromegas (MICRO-MEsh GASeous\ndetector) TPC device developed for the next high energy electron-positron\nlinear collider under study and a simple explanation for this backflow. A\nMicromegas micro-mesh has the intrinsic property to naturally stop a large\nfraction of the secondary positive ions created in the avalanche. It is shown\nthat under some workable conditions on the pitch of the mesh and on the gas\nmixture, the ion feedback is equal to the field ratio (ratio of the drift\nelectric field to the amplification field). Measurements with an intense X-ray\nsource are in good agreement with calculations and simulations. The conclusion\nis that in the electric field conditions foreseen for the Micromegas TPC (drift\nand amplification fields respectively equal to 150-200 V/cm and 50-80 kV/cm)\nthe expected ion backflow will be of the order of $2 - 3 x 10^-3$. In addition,\nmeasurements have been done in a 2T magnetic field: as expected the ion\nbackflow is not altered by the magnetic field.",
"arxiv_id": "physics/0412057",
"authors": [
"P. Colas",
"I. Giomataris",
"V. Lepeltier"
],
"categories": [
"physics.ins-det"
],
"doi": "10.1016/j.nima.2004.07.274",
"journal_ref": "Nuclear Instruments and Methods in Physics Research A 535 (2004)\n 226-230 - Conference: Xth Vienna Conference on Instrumentation (2004-02-16 to\n 2004-02-21), Vienne (at)",
"title": "Ion backflow in the Micromegas TPC for the future linear collider",
"url": "https://arxiv.org/abs/physics/0412057"
},
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