The ALICE Collaboration is planning a major upgrade of its central barreldetectors to be able to cope with the increased LHC luminosity beyond 2020. Forthe TPC, this implies a replacement of the currently used gated MWPCs(Multi-Wire Proportional Chamber) by GEM (Gas Electron Multiplier) basedreadout chambers. In order to prove, that the present particle identificationcapabilities via measurement of the specific energy loss are retained after theupgrade, a prototype of the ALICE IROC (Inner Readout Chamber) has beenevaluated in a test beam campaign at the CERN PS. The d$E$/d$x$ resolution ofthe prototype has been proven to be fully compatible with the current MWPCs.
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机译：ALICE协作组织计划对其中央桶形探测器进行重大升级，以应对2020年以后LHC发光度提高的问题。对于TPC，这意味着用GEM（气体电子）替代当前使用的门控MWPC（多线比例腔室）。基于乘数）的读数室。为了证明升级后保留了通过测量比能量损失而获得的当前粒子识别能力，已经在CERN PS的测试光束活动中评估了ALICE IROC（内部读数室）的原型。原型的d $ E $ / d $ x $分辨率已被证明与当前的MWPC完全兼容。
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