<<<<<<<<<<<<<<<<<<< CRC News No.1749：2011年 8月 12日 >>>>>>>>>>>>>>>>>>>>> ＣＲＣ会員 各位 ＣＲＣ事務局 宇宙線研支部 ********************＜ 9/12 KEK測定器開発室セミナー ＞******************** 関連分野の皆様、 KEK測定器開発室では高エネルギー・原子核およびその関連分野の測定器技術・ 応用に関する知見を深めるため、不定期でセミナーを開催しております。 来月１２日、Micromegasの開発者である Ioannis Giomataris氏をお招きし、 Micromegas検出器のレビューと展望についてご講演いただきます。 多数のご参加お待ちしております。 なお、期日が近づいてまいりましたら再送いたします。 ＴＶ会議システム等での中継も可能です。 ご希望の方は担当者までお問い合わせください。 　　　　　　　　　　　　　　　　　　　　　KEK測定器開発室 ******************** KEK DTP Seminar ************************** Title : Trends in instrumentation and new physics Speaker : Prof. Ioannis Giomataris (CEA-Saclay) Date : September 12, 2011 15:00~ Location : Meeting room in 4th floor, bldg. 4 (４号館３階輪講室２) Abstract : Micropattern gaseous detectors (MPGD), especially Micromegas and GEM are widely used by many　experiments and future projects. The high radiation resistance and excellent spatial and time resolution make them an invaluable tool to confront future detector challenges at the next generation of colliders. Some examples are particle and nuclear physics projects: COMPASS, CAST, LHC-B, TOTEM, STAR, NA48, CLAS12G, n-TOF, ILC, T2K, ATLAS-sLHC, CMS-sLHC. I will present a fast review on principle and basic performance of Micromegas detector. I will point out new developments that are currently under way and especially novel industrial ways of fabricating the detector in a single process. High-accuracy TPC read-out detectors, with positive ion suppression capability permitting to resolve high particle density events. Originally developed for the high-energy physics, Micromegas applications have expanded to astrophysics, neutrino physics, dark matter search, neutron detection and medical imaging. Its ability to detect low-energy, low-background rare events will also be discussed. The detection of low energy ion recoils in dark matter search could be of great importance to determine the direction of WIMP wind. First reconstructed tracks of keV recoils will be presented as a proof of the concept. The detector is used in CAST for solar axion search. The achieved low background level greatly improves the sensitivity of the experiment and suggests future investigations. A new type of radiation detector based on a spherical geometry will also be presented. The detector consists of a large spherical gas volume with a central electrode forming a radial electric field. A small spherical sensor located at the center is acting as a proportional amplification structure. This new concept has been proven to operate in a simple and robust way and allows reading large volumes with a single read-out channel. It allows high gas gains to be reached and operates in a wide range of gas pressures. Sub-keV energy threshold with good energy resolution is achieved. I will discuss recent results with a record energy threshold of 20 eV. The bench mark result is the observation of a well resolved peak at 283 eV due to carbon fluorescence which is unique performance for such large-massive detector. Such a device would open the way to detect the neutrino-nucleus interaction, which, although a standard process, remains undetected due to the low energy of the neutrino-induced nuclear recoils. Other physics goals of such a device could include supernova detection, low energy neutrino oscillations and study of non-standard properties of the neutrino, among others. Finally I will discuss two novel ideas in the neutrino physics sector: - A background free neutrino less double beta decay experiment - The direct detection of sterile neutrinos recently suggested by the Reactor Neutrino Anomaly. 担当：宇野（shoji.uno [at] kek.jp） 測定器開発室セミナー情報WEB：http://rd.kek.jp/seminar_01.html ＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝