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arXiv physics/0412057physics.ins-det
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未来直线对撞机Micromegas TPC中的离子回流

Ion backflow in the Micromegas TPC for the future linear collider

P. Colas, I. Giomataris, V. Lepeltier

摘要:

我们目前的离子回流测量Micromegas(MICRO-MEsh GASEous检测器)TPC设备开发的下一个高能电子-正电子直线对撞机正在研究和这种回流的一个简单的解释。Micromegas微网具有自然阻止雪崩中产生的大部分二次正离子的固有特性。结果表明,在一定的网格间距和混合气体条件下,离子反馈等于场比(漂移电场与放大场之比)。强X射线源的测量结果与计算和模拟结果吻合良好。结论是,在Micromegas TPC预见的电场条件下(漂移场和放大场分别等于150-200 V/cm和50-80 kV/cm),预期离子回流将为$2 - 3 x 10^-3$量级。此外,在2 T磁场中进行了测量:正如预期的那样,离子回流不会被磁场改变。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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