SmallSat太阳轴子和活动X射线成像仪（SSAXI）
SmallSat Solar Axion and Activity X-ray Imager (SSAXI)
摘要：
轴子是一种很有希望的暗物质候选者，也是解决量子色动力学（QCD）中强电荷宇称（CP）问题的一种方法。我们描述了一个新的小卫星太阳轴子和活动X射线成像仪（SSAXI）的任务概念，寻找太阳轴子或类轴子粒子（ALP），并监测整个太阳盘的太阳活动在一个很宽的动态范围。SSAXI的目标是明确地识别X射线转换从轴子在太阳磁场沿视线到太阳能核心，有效地成像太阳能核心。SSAXI还计划建立一个活动区、微耀斑和平静太阳区X射线活动的统计数据库，以了解日冕加热过程的起源。SSAXI采用小型轻量Wolter-I聚焦X射线光学器件（MiXO）和单片CMOS X射线传感器，封装紧凑。SSAXI的宽能量范围（0.5 - 6 keV）可以很容易地将轴子转换X射线的光谱与太阳活动的典型X射线光谱区分开，同时包含轴子转换X射线的主能量带（3 - 4.5 keV）。SSAXI的高角分辨率（30 arcsec HPD）和大视场（40 arcmin）将很容易解决3 arcmin宽的太阳核心上的增强X射线通量，同时完全覆盖整个太阳圆盘上的X射线活动。固有的耐辐射CMOS X射线传感器的快速读出功能可在宽的工作温度范围内实现具有宽动态范围的高分辨率光谱分析。SSAXI将在太阳同步轨道上运行一年，最好接近太阳极小期，以积累足够的X射线光子统计数据。
英文摘要：
Axions are a promising dark matter candidate as well as a solution to the strong charge-parity (CP) problem in quantum chromodynamics (QCD). We describe a new mission concept for SmallSat Solar Axion and Activity X-ray Imager (SSAXI) to search for solar axions or axion-like particles (ALPs) and to monitor solar activity of the entire solar disc over a wide dynamic range. SSAXI aims to unambiguously identify X-rays converted from axions in the solar magnetic field along the line of sight to the solar core, effectively imaging the solar core. SSAXI also plans to establish a statistical database of X-ray activities from Active Regions, microflares, and Quiet Sun regions to understand the origin of the solar corona heating processes. SSAXI employs Miniature lightweight Wolter-I focusing X-ray optics (MiXO) and monolithic CMOS X-ray sensors in a compact package. The wide energy range (0.5 - 6 keV) of SSAXI can easily distinguish spectra of axion-converted X-rays from typical X-ray spectra of solar activities, while encompassing the prime energy band (3 - 4.5 keV) of axion-converted X-rays. The high angular resolution (30 arcsec HPD) and large field of view (40 arcmin) in SSAXI will easily resolve the enhanced X-ray flux over the 3 arcmin wide solar core while fully covering the X-ray activity over the entire solar disc. The fast readout in the inherently radiation tolerant CMOS X-ray sensors enables high resolution spectroscopy with a wide dynamic range in a broad range of operational temperatures. SSAXI will operate in a Sun-synchronous orbit for 1 yr preferably near a solar minimum to accumulate sufficient X-ray photon statistics.
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