First results of a novel Silicon Drift Detector array designed for low energy X-ray fluorescence spectroscopy

作者：Rachevski Alexandre^*; Ahangarianabhari Mahdi; Bellutti Pierluigi; Bertuccio Giuseppe; Brigo Elena; Bufon Jernej; Carrato Sergio; Castoldi Andrea; Cautero Giuseppe; Fabiani Sergio; Giacomini Gabriele; Gianoncelli Alessandra; Giuressi Dario; Guazzoni Chiara; Kourousias George; Liu Chang; Menk Ralf Hendrik; Montemurro Giuseppe Vito; Picciotto Antonino; Piemonte Claudio; Rashevskaya Irina; Shi Yongbiao; Stolfa Andrea; Vacchi Andrea; Zampa Gianluigi; Zampa Nicola

来源：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment , 2016, 824: 452-454.

DOI：10.1016/j.nima.2015.06.038

• X-ray spectroscopy
• Silicon Drift Detectors
• LEXRF science

We developed a trapezoidal shaped matrix with 8 cells of Silicon Drift Detectors (SDD) featuring a very low leakage current (below 180 pA/cm(2) at 20 degrees C) and a shallow uniformly implanted p(+) entrance window that enables sensitivity down to few hundreds of eV. The matrix consists of a completely depleted volume of silicon wafer subdivided into 4 square cells and 4 half-size triangular cells. The energy resolution of a single square cell, readout by the ultra-low noise SIRIO charge sensitive preamplifier, is 158 eV FWHM at 5.9 keV and 0 degrees C. The total sensitive area of the matrix is 231 mm2 and the wafer thickness is 450 mu m. The detector was developed in the frame of the INFN R&D project ReDSoX in collaboration with FBK, Trento. Its trapezoidal shape was chosen in order to optimize the detection geometry for the experimental requirements of low energy X-ray fluorescence (LEXRF) spectroscopy, aiming at achieving a large detection angle. We plan to exploit the complete detector at the TwinMic spectromicroscopy beamline at the Elettra Synchrotron (Trieste, Italy). The complete system, composed of 4 matrices, increases the solid angle coverage of the isotropic photoemission hemisphere about 4 times over the present detector configuration. We report on the layout of the SDD matrix and of the experimental set-up, as well as the spectroscopic performance measured both in the laboratory and at the experimental beamline.

• 出版日期2016-7-11