The Time Projection Chamber (TPC) has been acknowledged as a probably powerful detector for the search of WIMPs by measuring the directions of nuclear recoils, in which essentially the most convincing signature of WIMPs, attributable to the Earth’s movement around the Galaxy, appears. We report on the first results of a performance study of the neutron exposure of our prototype micro TPC with Ar-C2H6 (90:10) and CF4 gasoline at 150 Torr. These particles could be detected immediately 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 energy deposits of WIMPs to nuclei are only a few tens of keV and the range of nuclei is limited, the micro-TPC needs to be operated at low pressures. In the current work, with a purpose 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) gas (one in every of the standard gases for TPCs) and itagpro bluetooth 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 a hundred MHz 8bit flash ADCs in order to find out the deposited power and the monitor route because the waveforms hold the Bragg curve shapes. Ar-C2H6 (90:10) or CF4 gas to a stress of 150 Torr and sealed in the course of the measurement. For measuring the gas gain and the power calibration, the gas was irradiated with 109Cd 22 keV and 133Ba 31.0 keV X-rays by means of a 1mm thick aluminum window close to the sensitive quantity. We irradiated the micro-TPC with neutrons from a 1 MBq 252Cf supply on the top of the vessel. 2 cm3 plastic scintillator have been used because the occasion set off. PIC and GEM with a rather low gas achieve (below 1000) with a purpose to observe the nuclear recoils.

PIC and changed the voltage between the GEM electrodes. Below a gas acquire of about 2000, our system was not able to measure the 109Cd 22 keV x-ray correctly as a consequence of a mismatch of the dynamic vary of the ASD chips and the flash ADC; subsequently, the deposited vitality in low-achieve operations was extrapolated from the calibrations with the high gasoline gain operations. We evaluated the track length as a operate of the measured electron equal vitality in the next manner. E/dx𝑑𝐸𝑑𝑥dE/dx threshold can be indicated for a comparison. Under operation with a gas acquire of 3000, electron recoils and proton (of C2H6) recoils have been clearly observed in response to their dE/dx𝑑𝐸𝑑𝑥dE/dx. However, smart key finder within the operation of the gas achieve of 900, the C and Ar recoils and a few proton recoils were noticed due to the high dE/dx𝑑𝐸𝑑𝑥dE/dx threshold. The measured observe length of events when the GEM voltage was set to 215 V (fuel acquire of 4500) and 95 V (gas gain of 800) are shown in Fig.4. We efficiently confirmed the nuclear recoils in 150 Torr of Ar-C2H6 (90:10) and CF4 gases in response to their dE/dx𝑑𝐸𝑑𝑥dE/dx by changing the detector threshold. In terms of dE/dx𝑑𝐸𝑑𝑥dE/dx, the tracks within the micro TPC were a lot easier to detect for C, F or Ar recoils. Ultimately, our concern is the recoil route of such nuclei under 100 keV to permit us to observe the indicators of WIMPs. In order to acquire longer tracks and clear Bragg curves, increased gas achieve operations at decrease pressures with low-energy neutron beams are needed. The measurement of the incident neutron vitality with Time-Of-Flight may also be helpful to study the quenching factor of nuclear ionization within the micro-TPC.

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