The Time Projection Chamber (TPC) has been acknowledged as a potentially highly effective detector for the search of WIMPs by measuring the instructions of nuclear recoils, through which probably the most convincing signature of WIMPs, attributable to the Earth’s motion around the Galaxy, seems. We report on the first outcomes of a efficiency research of the neutron publicity of our prototype micro TPC with Ar-C2H6 (90:10) and CF4 fuel at a hundred and fifty Torr. These particles could possibly be detected straight by measuring the nuclear recoils produced by their elastic scattering off nuclei in detectors. Essentially the most convincing signature of WIMPs seems in the instructions of nuclear recoils. Because the power deposits of WIMPs to nuclei are only some tens of keV and the vary of nuclei is proscribed, iTagPro smart device the micro-TPC should be operated at low pressures. In the present work, as a way to look at the response of the micro-TPC to nuclear recoils at low pressures as a primary step, we irradiated a 150 Torr Ar-C2H6 (90:10 mixture) gasoline (one of the usual gases for TPCs) and CF4 with neutrons from 252Cf. The track lengths and deposited energies of Ar, iTagPro smart device C, and F recoils have been investigated.
The prototype micro-TPC used in this measurements is shown in Fig.1. PIC and GEM. The small print of this GEM are described in Refs. The pre-amplified indicators are summed and digitized by a hundred MHz 8bit flash ADCs so as to find out the deposited power and the observe route because the waveforms hold the Bragg curve shapes. Ar-C2H6 (90:10) or CF4 fuel to a strain of 150 Torr and sealed for the duration of the measurement. For ItagPro measuring the fuel achieve and the vitality calibration, the gas was irradiated with 109Cd 22 keV and 133Ba 31.Zero keV X-rays by way of a 1mm thick aluminum window close to the delicate quantity. We irradiated the micro-TPC with neutrons from a 1 MBq 252Cf supply on the highest of the vessel. 2 cm3 plastic scintillator were used as the occasion trigger. PIC and GEM with a moderately low fuel achieve (below 1000) as a way to observe the nuclear recoils.
PIC and adjusted the voltage between the GEM electrodes. Below a gas acquire of about 2000, ItagPro our system was not capable of measure the 109Cd 22 keV x-ray accurately due to a mismatch of the dynamic range of the ASD chips and iTagPro smart device the flash ADC