two-dimensional multiwire gas proportional detector for x-ray photon correlation spectroscopy of condensed matter：二维多丝气体探测器对凝聚态物质的x射线光子相关光谱法.pdfVIP

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two-dimensional multiwire gas proportional detector for x-ray photon correlation spectroscopy of condensed matter：二维多丝气体探测器对凝聚态物质的x射线光子相关光谱法.pdf

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two-dimensional multiwire gas proportional detector for x-ray photon correlation spectroscopy of condensed matter：二维多丝气体探测器对凝聚态物质的x射线光子相关光谱法

ARTICLE IN PRESS Nuclear Instruments and Methods in Physics Research A 587 (2008) 434–440 /locate/nima Two-dimensional multiwire gas proportional detector for X-ray photon correlation spectroscopy of condensed matter a, b b Tae Joo Shin , Steven B. Dierker , Graham C. Smith aPohang Acceleratory Laboratory, Pohang, Kyungbuk 790-784, Republic of Korea bBrookhaven National Laboratory, Upton, NY 11973, USA Received 18 May 2007; received in revised form 14 January 2008; accepted 16 January 2008 Available online 31 January 2008 Abstract Details of a two-dimensional (2-D) multiwire gas proportional detector for X-ray photon correlation spectroscopy (XPCS) of condensed matter are described. The characteristics of the gas proportional detector at 8 keV, 0.3 pC anode charge, and 3 bar (absolute) of Xe/10%CO 7 2 2 are as follows: 8.5 10 counts/s (100 100 mm ) dark count rate, ms time resolution, 48 and 73 mm position resolution (FWHM) along and across the anode wire direction, respectively, and 80% quantum efﬁciency. The effects of incident photon energy, anode charge (i.e., gain), gas drift depth, and gas pressure on position resolution are discussed. Static and dynamic speckle patterns, measured from disordered aerogel and polystyrene/polybutadiene blends by a partially coherent synchrotron X-ray sou