J-PARC muon facility, MUSE
J-PARC muon facility, MUSE
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DOI：
10.1088/1742-6596/225/1/012036
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发表时间：
2010-04
期刊：
影响因子：
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通讯作者：
Y. Miyake;K. Shimomura;N. Kawamura;P. Strasser;S. Makimura;A. Koda;H. Fujimori;K. Nakahara
中科院分区：
文献类型：
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作者：
Y. Miyake;K. Shimomura;N. Kawamura;P. Strasser;S. Makimura;A. Koda;H. Fujimori;K. Nakahara
μ子科学设施（MUSE，MUon Science Establishment的缩写）与中子、强子、中微子设施一起，沿着为2001年~ 2008年批准建设的J-PARC项目的实验区之一。MUSE设施位于材料和生命科学设施（MLF）内，这是一座集成了中子和μ子科学计划的建筑。多边基金大楼于2004年初开始建造，并于2006财政年度结束时完工。对于第一阶段，我们设法安装一个超导衰变/表面μ介子通道与适度接受（约45 mSr）π介子注入器在2008年夏天。最后，在2008年9月19日，20 mm厚的边缘冷却，非旋转石墨靶，它是由一个铜框架包围，是第一次，被放置到3GeV质子束从快速循环同步加速器（RCS）获得。3 GeV的质子束与碳原子核之间的核反应会产生带正电荷（π+）和负电荷（π−）的π介子。2008年9月26日，我们终于成功提取了？表面μ子（μ+），它是从质子束线中π+在π介子产生靶表面附近衰变得到的。首先，我们通过调整超导磁体、四极磁体和弯曲磁体以及DC分离器来调试次级μ子束线光学器件，以优化表面μ子束的传输并消除e+污染。然后，在2008年12月25日，我们还成功地提取了“衰变μ子（μ+/μ-）"，这是通过π+/π−的飞行衰变获得的
The muon science facility (MUSE, abbreviation of MUon Science Establishment), along with the neutron, hadron, and neutrino facilities, is one of the experimental areas of the J-PARC project, which was approved for construction in a period from 2001 to 2008. The MUSE facility is located in the Materials and Life Science Facility (MLF), which is a building integrated to include both neutron and muon science programs. Construction of the MLF building was started in the beginning of 2004, and was completed at the end of the 2006 fiscal year. For Phase 1, we managed to install one super-conducting decay/surface muon channel with a modest-acceptance (about 45 mSr) pion injector in the summer of 2008. Finally, on September 19th, 2008, the 20 mm thick edge-cooled, non-rotating graphite target, which is surrounded by a copper frame, was, for the first time, placed into the 3GeV proton beam obtained from the rapid cycling synchrotron (RCS). The nuclear reactions between the 3 GeV proton beam and the nucleus of carbon produce both positively (π+) and negatively (π−) charged pions. On September 26th, 2008, we finally succeeded to extract? surface muons (μ+), which are obtained from the decay of π+ near the surface of the pion production target in the proton beam line. First, we commissioned the secondary muon beam line optics by tuning the superconducting magnet, the quadrupole and bending magnets, and the DC separator in order to optimize the transport of the surface muon beam and to eliminate the e+ contamination. Then, on December 25th, 2008, we also succeeded in the extraction of the "decay muons (μ+/μ-)", which are obtained through the in-flight decay of π+/π−