Magee R M, Clary R, Korepanov S, Smirnov A, Garate E, Knapp K, Tkachev A
Tri Alpha Energy, Inc., Rancho Santa Margarita, California 92688, USA.
Budker Institute of Nuclear Physics, Novosibirsk, Russia.
Rev Sci Instrum. 2014 Nov;85(11):11D851. doi: 10.1063/1.4892861.
Measurements of the flux of fusion products from high temperature plasmas provide valuable insights into the ion energy distribution, as the fusion reaction rate is a very sensitive function of ion energy. In C-2, where field reversed configuration plasmas are formed by the collision of two compact toroids and partially sustained by high power neutral beam injection [M. Binderbauer et al., Phys. Rev. Lett. 105, 045003 (2010); M. Tuszewski et al., Phys. Rev. Lett. 108, 255008 (2012)], measurements of DD fusion neutron flux are used to diagnose ion temperature and study fast ion confinement and dynamics. In this paper, we will describe the development of a new 3 MeV proton detector that will complement existing neutron detectors. The detector is a large area (50 cm(2)), partially depleted, ion implanted silicon diode operated in a pulse counting regime. While the scintillator-based neutron detectors allow for high time resolution measurements (∼100 kHz), they have no spatial or energy resolution. The proton detector will provide 10 cm spatial resolution, allowing us to determine if the axial distribution of fast ions is consistent with classical fast ion theory or whether anomalous scattering mechanisms are active. We will describe in detail the diagnostic design and present initial data from a neutral beam test chamber.
高温等离子体聚变产物通量的测量为离子能量分布提供了有价值的见解，因为聚变反应速率是离子能量的非常敏感的函数。在C-2装置中，场反向配置等离子体由两个紧凑型环面碰撞形成，并由高功率中性束注入部分维持[M. Binderbauer等人，《物理评论快报》105, 045003 (2010); M. Tuszewski等人，《物理评论快报》108, 255008 (2012)]；氘-氘聚变中子通量的测量用于诊断离子温度，并研究快离子的约束和动力学。在本文中，我们将描述一种新型3兆电子伏质子探测器的研制情况，该探测器将补充现有的中子探测器。该探测器是一个大面积（50平方厘米）、部分耗尽的离子注入硅二极管，工作在脉冲计数模式。基于闪烁体的中子探测器虽然能够进行高时间分辨率测量（约100千赫），但它们没有空间或能量分辨率。质子探测器将提供10厘米的空间分辨率，使我们能够确定快离子的轴向分布是否与经典快离子理论一致，或者反常散射机制是否起作用。我们将详细描述诊断设计，并展示来自中性束测试腔的初始数据。
