The status and prospects of the Q & A experiment with some applications
Hsien-Hao Mei, Wei-Tou Ni, Sheng-Jui Chen, Sheau-shi Pan
备注:
4 pages, 1 table and 2 figures, to be published in the 5th Patras Workshop on Axions, WIMPs and WISPs held at the University of Durham on 13-17 July 2009
发表信息:
Proceedings of the 5th Patras Workshop on Axions, WIMPs and WISPs (PATRAS 2009), Durham, United Kingdom, July 13-17 2009, Editors: Joerg Jaeckel, Axel Lindner and Javier Redondo, pp. 108-111
Motivated to measure the QED birefringence and to detect pseudoscalar-photon interaction, we started to build up the Q & A experiment (QED [Quantum Electrodynamics] and Axion experiment) in 1994. In this talk, we first review our 3.5 m Fabry-Perot interferometer together with our results of measuring Cotton-Mouton effects of gases. We are uprading our interferometer to 7 m armlength with a new 1.8 m 2.3 T permanent magnet capable of rotation up to 13 cycles per second. We will use 532 nm Nd:YAG laser as light source with cavity finesse around 100,000, and aim at 10 nrad/Hz^{1/2} optical sensitivity. With all these achieved and the upgrading of vacuum, QED birefringence would be measured to 28% in about 50 days. Along the way, we should be able to improve on the dichroism detection significantly.
本文介绍了北京正负电子对撞机(BEPC Ⅱ)的现状和展望,BEPC Ⅱ的状态良好,最近达到了最高亮度7.08* 10^32 cm ^-2 s ^-1。自2009年以来,BESIII探测器一直稳定运行。其子探测器的升级计划已经提出,升级正在进行中。主要的升级来自漂移室和飞行时间计数器。其他子探测器状态良好,无需升级。考虑到BESIII探测器的现状和升级计划,预计BESIII能够工作8到10年。
Status and prospects of the NEXT experiment for neutrinoless double beta decay searches
NEXT(Neutrino Experiment with a Xenon TPC)是一个实验计划,其目标是在高压氙TPC中使用$^{136}$探测器,通过电致发光读出,发现无中微子双β衰变。在本文中,将报告NEXT-White探测器的结果,该探测器目前正在Canfranc Subterráneo(LSC)采集数据。还将简要讨论计划于2020年开始运行的NEXT-100装置的前景,以及将该技术扩展到充分探索中微子质量逆层次所需的大型和超低背景探测器的计划。
中国暗物质实验(CDEX)的目标是在中国锦屏地下实验室(CJPL)直接搜索轻弱相互作用大质量粒子(WIMP),覆盖层约为2400米。报道了CDEX-1 994 g p型点接触锗(pPCGe)探测器的实验结果。研究计划的追求,以进一步降低物理阈值,通过改进硬件和数据分析。目前正在测试CDEX-10实验,其pPCGe阵列的目标质量范围为10公斤。本研究亦将介绍CDEX计划发展为“CDEX-1 T实验”的过程,其中包括使用吨级锗探测器阵列。
AWAKE协作正在进行质子驱动等离子体尾场加速电子的演示。AWAKE实验使用来自CERN SPS的\SI{400}{GeV/c}质子聚束,其均方根聚束长度为$6$,以驱动电子密度为$10^{14}-10^{15}$ cm $^{-3}$的\SI{10}{m}长铷等离子体中的尾场。由于驱动聚束长度比这些等离子体密度的等离子体波长($λ_{pe}<$ \SI{3}{mm})长得多,AWAKE进行了实验,以证明长质子聚束在等离子体中自调制(2017)。下一步是演示由自调制聚束驱动的尾场中电子的加速(2018)。我们总结了自调制测量的概念,并描述了电子加速实验的计划和挑战。