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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Dark Matter Time Projection Chamber ： ウィキペディア英語版 Dark Matter Time Projection Chamber The Dark Matter Time Projection Chamber (DMTPC) is an experiment for direct detection of weakly interacting massive particles (WIMPs), one of the most favored candidates for dark matter. The experiment uses a low-pressure time projection chamber in order to extract the original direction of potential dark matter events. The collaboration includes physicists from the Massachusetts Institute of Technology (MIT), Boston University (BU), and Brandeis University. Several prototype detectors have been built and tested in laboratories at MIT and BU. The group took its first data in an underground laboratory at the Waste Isolation Pilot Plant (WIPP) site near Carlsbad, New Mexico in Fall, 2010. ==Detector Concept== The DMTPC detector consists of a TPC filled with low pressure CF4 gas. Charged particles incident on the gas are slowed and eventually stopped, leaving a trail of free electrons and ionized molecules. The electrons are drifted by an electric field toward an amplification region. Instead of using MWPC endplates for amplification and event readout, as in the traditional TPC design, the DMTPC amplification region consists of a metal wire mesh separated from a copper anode with a high electric field between them. This creates a more uniform electric field in order to preserve the shape of the original track during amplification. The avalanche of electrons also creates a great deal of scintillation light, which passes through the wire mesh. Some of this light is collected by a CCD camera located outside the main detector volume. This results in a two dimensional image of the ionization signal of the track as it appeared on the amplification plane. Information about the charged particle, including its direction of motion within the detector, can be reconstructed from the CCD readout. Additional track information is obtained from readout of the charge signal on the anode plane. The largest existing prototype detectors each have a total of 20 L of CF4 gas within the drift region, where measurable events will occur. The group also plans to eventually construct a detector with a volume of 1 m3. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Dark Matter Time Projection Chamber」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.