High resolution two dimensional Multi-Grid-Type MSGC using encoding method

本研究首先开发了采用全局-局部编码方法的多栅格型微带毒气室。这种探测器采用了最新的微加工技术。我们已经实现了一种新的位置传感原理，它使整个电子设备的比例比单个读出方法小十倍左右。比例计数器通过选择合适的气体混合物进行计数，可以适用于许多应用，但是，由于在J-PARC项目等领域的需求不断增加，我们强调了中子应用。msgc在空间分辨率和能量分辨率方面都提供了非常有前景的特性。我们利用新的全局-局部分组方法开发了一种位置敏感的x射线和中子MSGC。对于100mm × 100mm的二维探测器，阳极间距选择在400um左右。我们还开发了一种长640mm的半二维探测器，也是基于全局-局部编码方法。成功地保证了该方法的原理，并证明了二维探测器的位置分辨率为600 μ m。对于半二维探测器，我们使用He-3 （0.5 atm）和CF4 （2 atm）实现了-2mm的总体位置分辨率。虽然这个分辨率对于大多数中子应用来说已经足够了，但为了获得更好的空间分辨率和更高的探测效率，需要使用更高压力的气体混合物。

Multi-grid-type MSGC (MicroStrip Gas Chamber) with global-local encoding method has originally been developed in this research. This detector utilizes the latest microfabrication techniques. We have implemented a new position sensing principle which enables the scale-down of the entire electronics about ten times smaller than that of the individual readout method. The proportional counters are applicable to many applications by choosing a proper gas mixture for counting, however, we have emphasized the neutron application since there has been an increasing demand in this area such as in J-PARC project. MSGCs provide very promising features in both spatial resolution and energy resolution. We have developed a position-sensitive X-ray and neutron MSGC with the new global-local grouping method. Anode pitch was selected to be about 400 um for 100mm x 100mm two dimensional detector. We have also developed a semi two-dimensional detector of 640mm long, which is also based on the global-local encoding method. The principle of the method has successfully been ensured and the position resolution of 600 um for the two dimensional detector has been demonstrated. For semi two-dimensional detectors, we have achieved an overall position resolution of -2mm using He-3 (0.5 atm) and CF4 (2 atm). Although this resolution is sufficient for most of neutron applications, the use of higher pressure gas mixture is desirable for better spatial resolution and higher detection efficiency.