Gamma‐Ray Polarimetry of the Prompt Emission by IKAROS‐GAP
Gamma‐Ray Polarimetry of the Prompt Emission by IKAROS‐GAP
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DOI：
10.1063/1.3621816
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发表时间：
2011-08
期刊：
影响因子：
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通讯作者：
D. Yonetoku;T. Murakami;T. Sakashita;Y. Morihara;Y. Kikuchi;Takuya Takahashi;S. Gunji;T. Mihara;S. Kubo
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文献类型：
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作者：
D. Yonetoku;T. Murakami;T. Sakashita;Y. Morihara;Y. Kikuchi;Takuya Takahashi;S. Gunji;T. Mihara;S. Kubo
小型太阳能帆验证器“IKAROS”是日本工程验证航天器，于2010年5月21日在JAXA种子岛航天中心由H-IIA火箭发射。 IKAROS 拥有直径 20 m 的帆，由聚酰亚胺薄膜制成。该风帆将太阳辐射压力转化为 IKAROS 的推进力并加速航天器。 IKAROS 上的伽马射线暴偏振计 (GAP) 是第一款专门设计用于测量太空伽马射线暴 (GRB) 偏振的偏振计，并将在 IKAROS 任务的巡航阶段进行测量。 GAP 是一款重量适中的探测器，重量为 3.8 千克，尺寸为 17 厘米，能量范围在 50-300 keV 之间。 GAP探测器可以是行星际网络（IPN）的成员，用于确定GRB方向。伽马射线偏振的探测原理是康普顿散射的各向异性。中心塑料康普顿散射介质与分布在塑料两侧的离散 CsI 探测器之间的重合定义了康普顿散射角，如果给定伽玛暴中存在偏振，则预计该角会显示出角度依赖性。我们介绍了 GAP 探测器及其地面和机载校准。
The small solar power sail demonstrator “IKAROS” is a Japanese engineering verification spacecraft launched by H‐IIA rocket on May 21, 2010 at JAXA Tanegashima Space Center. IKAROS has a 20 m diameter sail which is made of thin polyimide membrane. This sail converts the solar radiation‐pressure into the propulsion force of IKAROS and accelerates the spacecraft. The Gamma‐Ray Burst Polarimeter (GAP) aboard IKAROS is the first polarimeter specifically designed to measure the polarization of Gamma‐Ray Bursts (GRBs) from space, and will do so in the cruising phase of the IKAROS mission. GAP is a modest detector of 3.8 kg in weight and 17 cm in size with an energy range between 50–300 keV. The GAP detector can be a member of the interplanetary network (IPN) for the determination of the GRB direction. The detection principle of gamma‐ray polarization is the anisotropy of the Compton scattering. Coincidence between the central plastic Compton scattering medium and discrete CsI detectors distributed around the sides of the plastic defines the Compton scattering angle, which is expected to show an angular dependence if polarization is present in a given GRB. We presented the GAP detector and its ground and onboard calibrations.