Reconstruction algorithm study of 2D interpolating resistive readout structure

Abstract

Systematic investigations including both simulation and prototype tests have been done about the interpolating resistive readout structure with GEM (Gaseous Electron Multiplier) detector. From the simulation, we have a good knowledge of the process of charges diffusion on the surface of the readout plane and develop several reconstruction methods to determine the hit position. The total signal duration time of a typical event with the readout structure is about several hundred nanoseconds, which implied an ideal count rate up to 10 6 Hz. A stable worked prototype was designed and fabricated after the simulation. Using 55Fe 5.9keV X-Ray, the image performance of the prototype is examined with flat field image and some special geometry shapes, meanwhile, an energy resolution of about 17% is obtained.

Design and optimization of resistive anode for a two-dimensional imaging GEM detector

“…To reduce the distortion caused by charge loss from the fired pad to the adjacent pads, some improved methods have been developed [11,13]. These relatively complex reconstruction methods can lead to good reconstruc-tion results by using more information from the nodes on the adjacent pads.…”

“…In order to understand the mechanics of charge diffusion on the resistive anode as well as to provide a basis for the optimization of the anode structure, a numerical simulation model has been developed [10,11]. By using the differential Ohm's law,…”

“…The charge diffusion on the resistive anode is then abstracted as the solving of a partial differential equation with the constraint condition that the voltage at all readout nodes equals zero. The explicit finite difference method (FDM) is used to solve the equation in this work [10,11].…”

Two-dimensional imaging triple-GEM detector with resistive anode readout

“…Based on the previous experimental results mentioned in refs. [13][14][15][16], we develop a triple-GEM detector prototype for the purpose of two dimensional X-ray imaging. The resistive anode readout board has 11 × 11 resistive cells and covers 88 × 88 mm 2 sensitive area with 144 readout channels.…”

Development of a two-dimensional imaging GEM detector using the resistive anode readout method with $6\times6$ cells

“…We have developed a series of triple-GEM detectors to study this kind of readout method as well, and good detector performances have been achieved [12][13][14]. However, in our previous prototype studies [14], only the basic reconstruction element of this readout structure, which consists of 3×3 cells, is used availably as the readout anode of the detector, because of the limitation of the electronics.…”