X-ray polarimetry with a micropattern TPC
X-ray polarimetry with a micropattern TPC
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DOI：
10.1016/j.nima.2007.08.144
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发表时间：
2007-11
影响因子：
1.4
通讯作者：
J. Black;R. Baker;P. Deines-Jones;J. Hill;K. Jahoda
中科院分区：
文献类型：
--
作者：
J. Black;R. Baker;P. Deines-Jones;J. Hill;K. Jahoda
微图案时间投影室（TPC）提供了一种新的方法成像的轨道的光电子作为一种手段的X射线偏振与潜力，同时实现大的调制因子和高的量子效率。用一个简单的原型微图案TPC偏振计测量，具有18 mm-大气压的吸收深度的50%氖和50%二甲醚的混合物，导致45.0±0.6%的调制因子与偏振6.4keV的X射线。在5.9keV非偏振X射线条件下，测得调制因子为0.49± 0.54%，与零一致。TPC偏振计的几何结构将使得能够在不损失调制的情况下大幅提高量子效率。
The micropattern time projection chamber (TPC) offers a novel method of imaging the tracks of photoelectrons as a means of X-ray polarimetry with the potential to simultaneously achieve large modulation factors and high quantum efficiency. Measurements with a simple prototype micropattern TPC polarimeter, with an 18mm-atm absorption depth of a mixture of 50% neon and 50% dimethyl ether, result in a modulation factor of 45.0±0.6% with polarized 6.4keV X-rays. With unpolarized 5.9keV X-rays, the measured modulation factor is 0.49±0.54%, consistent with zero. The geometry of the TPC polarimeter will enable substantial improvements in quantum efficiency without the loss of modulation.