The Time Projection Chamber (TPC) has been acknowledged as a doubtlessly highly effective detector for the search of WIMPs by measuring the instructions of nuclear recoils, by which the most convincing signature of WIMPs, caused by the Earth’s motion around the Galaxy, iTagPro bluetooth tracker appears. We report on the primary outcomes of a efficiency research of the neutron exposure of our prototype micro TPC with Ar-C2H6 (90:10) and CF4 gas at 150 Torr. These particles could be detected straight by measuring the nuclear recoils produced by their elastic scattering off nuclei in detectors. The most convincing signature of WIMPs seems in the directions of nuclear recoils. Since the vitality deposits of WIMPs to nuclei are only some tens of keV and the range of nuclei is limited, the micro-TPC ought to be operated at low pressures. In the current work, in order to study the response of the micro-TPC to nuclear recoils at low pressures as a primary step, we irradiated a one hundred fifty Torr Ar-C2H6 (90:10 mixture) gasoline (one in every of the standard gases for TPCs) and CF4 with neutrons from 252Cf. The monitor lengths and deposited energies of Ar, C, and F recoils were investigated.
The prototype micro-TPC used on this measurements is shown in Fig.1. PIC and GEM. The small print of this GEM are described in Refs. The pre-amplified signals are summed and digitized by 100 MHz 8bit flash ADCs so as to find out the deposited vitality and the observe course as the waveforms hold the Bragg curve shapes. Ar-C2H6 (90:10) or CF4 gasoline to a pressure of one hundred fifty Torr and sealed in the course of the measurement. For measuring the fuel acquire and the power calibration, the gas was irradiated with 109Cd 22 keV and 133Ba 31.0 keV X-rays by a 1mm thick aluminum window close to the sensitive volume. We irradiated the micro-TPC with neutrons from a 1 MBq 252Cf source on the top of the vessel. 2 cm3 plastic scintillator have been used as the event set off. PIC and GEM with a slightly low gasoline gain (below 1000) so as to observe the nuclear recoils.
PIC and iTagPro smart tracker changed the voltage between the GEM electrodes. Below a fuel acquire of about 2000, our system was not in a position to measure the 109Cd 22 keV x-ray correctly on account of a mismatch of the dynamic range of the ASD chips and the flash ADC