Development Of Gaseous Tracking Devices For The Search Of WIMPs

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, wherein probably the most convincing signature of WIMPs, attributable to the Earth’s movement across the Galaxy, appears. We report on the primary results 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 immediately by measuring the nuclear recoils produced by their elastic scattering off nuclei in detectors. The most convincing signature of WIMPs appears within the instructions of nuclear recoils. For the reason that energy deposits of WIMPs to nuclei are just a few tens of keV and the range of nuclei is restricted, the micro-TPC needs to be operated at low pressures. In the current work, in an effort to study the response of the micro-TPC to nuclear recoils at low pressures as a primary step, we irradiated a a hundred and fifty Torr Ar-C2H6 (90:10 mixture) fuel (certainly one of the usual gases for TPCs) and CF4 with neutrons from 252Cf. The observe lengths and deposited energies of Ar, C, and F recoils were investigated.



The prototype micro-TPC used on this measurements is proven 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 100 MHz 8bit flash ADCs so as to find out the deposited power and iTagPro key finder the monitor course because the waveforms hold the Bragg curve shapes. Ar-C2H6 (90:10) or CF4 gas to a strain of one hundred fifty Torr and sealed for the duration of the measurement. For measuring the gasoline achieve and the energy calibration, the gas was irradiated with 109Cd 22 keV and 133Ba 31.0 keV X-rays via a 1mm thick aluminum window near the sensitive volume. We irradiated the micro-TPC with neutrons from a 1 MBq 252Cf supply on the top of the vessel. 2 cm3 plastic scintillator were used because the event set off. PIC and GEM with a reasonably low fuel gain (under 1000) to be able to observe the nuclear recoils.



PIC and altered the voltage between the GEM electrodes. Below a gasoline achieve of about 2000, our system was not in a position to measure the 109Cd 22 keV x-ray accurately because of a mismatch of the dynamic vary of the ASD chips and the flash ADC; due to this fact, the deposited vitality in low-achieve operations was extrapolated from the calibrations with the high fuel gain operations. We evaluated the monitor iTagPro official size as a function of the measured electron equivalent energy in the following means. E/dx𝑑𝐸𝑑𝑥dE/dx threshold can be indicated for a comparability. Under operation with a fuel gain of 3000, electron recoils and proton (of C2H6) recoils have been clearly observed in response to their dE/dx𝑑𝐸𝑑𝑥dE/dx. Then again, within the operation of the gas gain of 900, the C and Ar recoils and some proton recoils had been observed because of the excessive dE/dx𝑑𝐸𝑑𝑥dE/dx threshold. The measured observe length of events when the GEM voltage was set to 215 V (gas gain of 4500) and 95 V (fuel gain of 800) are shown in Fig.4. We successfully showed the nuclear recoils in one hundred fifty Torr of Ar-C2H6 (90:10) and CF4 gases based on their dE/dx𝑑𝐸𝑑𝑥dE/dx by altering the detector threshold. In terms of dE/dx𝑑𝐸𝑑𝑥dE/dx, iTagPro support the tracks within the micro TPC had been much simpler to detect for C, F or Ar recoils. Ultimately, our concern is the recoil route of such nuclei under one hundred keV to permit us to observe the signals of WIMPs. So as to acquire longer tracks and clear Bragg curves, increased fuel achieve operations at lower pressures with low-power neutron beams are wanted. The measurement of the incident neutron power with Time-Of-Flight might also be helpful to examine the quenching issue of nuclear ionization in the micro-TPC.



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