Development Of Gaseous Tracking Devices For The Search Of WIMPs
The Time Projection Chamber (TPC) has been recognized as a potentially powerful detector for the search of WIMPs by measuring the directions of nuclear recoils, in which the most convincing signature of WIMPs, brought on by the Earth’s movement across the Galaxy, seems. We report on the first results of a efficiency study of the neutron publicity of our prototype micro TPC with Ar-C2H6 (90:10) and CF4 fuel at one hundred fifty 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 appears within the directions of nuclear recoils. For the reason that energy deposits of WIMPs to nuclei are only a few tens of keV and the range of nuclei is restricted, the micro-TPC should be operated at low pressures. In the current 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 in every of the usual gases for TPCs) and CF4 with neutrons from 252Cf. The observe lengths and deposited energies of Ar, ItagPro C, and F recoils had been 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 signals are summed and digitized by 100 MHz 8bit flash ADCs so as to determine the deposited vitality and the monitor route because the waveforms hold the Bragg curve shapes. Ar-C2H6 (90:10) or CF4 gas to a pressure of a hundred and fifty Torr and sealed for the duration of the measurement. For measuring the fuel achieve and the vitality calibration, the gas was irradiated with 109Cd 22 keV and 133Ba 31.0 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 because the event set off. PIC and GEM with a relatively low fuel achieve (under 1000) with a purpose to observe the nuclear recoils.
PIC and changed the voltage between the GEM electrodes. Below a fuel achieve of about 2000, our system was not able to measure the 109Cd 22 keV x-ray correctly on account of a mismatch of the dynamic vary of the ASD chips and the flash ADC; therefore, the deposited vitality in low-achieve operations was extrapolated from the calibrations with the excessive fuel acquire operations. We evaluated the monitor size as a operate of the measured electron equal vitality in the following approach. E/dx𝑑𝐸𝑑𝑥dE/dx threshold is also indicated for a comparison. Under operation with a gasoline acquire of 3000, electron recoils and proton (of C2H6) recoils had been clearly observed in line with their dE/dx𝑑𝐸𝑑𝑥dE/dx. Alternatively, in the operation of the gasoline acquire of 900, the C and Ar recoils and some proton recoils have been noticed because of the excessive dE/dx𝑑𝐸𝑑𝑥dE/dx threshold. The measured observe length of occasions when the GEM voltage was set to 215 V (gas achieve of 4500) and ItagPro 95 V (gas achieve of 800) are proven in Fig.4. We successfully confirmed the nuclear recoils in one hundred fifty Torr of Ar-C2H6 (90:10) and CF4 gases according to their dE/dx𝑑𝐸𝑑𝑥dE/dx by changing the detector threshold. When it comes to dE/dx𝑑𝐸𝑑𝑥dE/dx, the tracks within the micro TPC have been much easier to detect for C, F or Ar recoils. Ultimately, smart key finder our concern is the recoil direction of such nuclei beneath one hundred keV to permit us to observe the alerts of WIMPs. So as to acquire longer tracks and clear Bragg curves, higher fuel acquire operations at lower pressures with low-power neutron beams are needed. The measurement of the incident neutron energy with Time-Of-Flight could also be useful to examine the quenching issue of nuclear ionization in the micro-TPC.
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