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 directions of nuclear recoils, by which the most convincing signature of WIMPs, attributable to the Earth’s movement across the Galaxy, appears. We report on the first results of a performance study of the neutron publicity of our prototype micro TPC with Ar-C2H6 (90:10) and CF4 gasoline at one hundred fifty Torr. These particles could be detected directly by measuring the nuclear recoils produced by their elastic scattering off nuclei in detectors. The most convincing signature of WIMPs seems within the directions of nuclear recoils. Because the power deposits of WIMPs to nuclei are only some tens of keV and the vary of nuclei is restricted, the micro-TPC must be operated at low pressures. In the present work, in order to look at 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 of the standard gases for TPCs) and CF4 with neutrons from 252Cf. The monitor lengths and deposited energies of Ar, C, and F recoils have been investigated.
The prototype micro-TPC used in this measurements is shown in Fig.1. PIC and iTagPro portable GEM. The details of this GEM are described in Refs. The pre-amplified indicators are summed and iTagPro portable digitized by one hundred MHz 8bit flash ADCs in order to determine the deposited power and iTagPro portable the monitor path as 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 at some stage in the measurement. For measuring the gas gain and the energy calibration, the fuel was irradiated with 109Cd 22 keV and 133Ba 31.0 keV X-rays through a 1mm thick aluminum window near the delicate volume. We irradiated the micro-TPC with neutrons from a 1 MBq 252Cf source on the top of the vessel. 2 cm3 plastic scintillator were used because the event trigger. PIC and GEM with a relatively low gas acquire (beneath 1000) to be able to observe the nuclear recoils.
PIC and changed the voltage between the GEM electrodes. Below a gasoline gain of about 2000, our system was not capable of measure the 109Cd 22 keV x-ray correctly because of a mismatch of the dynamic vary of the ASD chips and the flash ADC; subsequently, the deposited energy in low-acquire operations was extrapolated from the calibrations with the excessive gas achieve operations. We evaluated the track length as a operate of the measured electron equal energy in the following approach. E/dx𝑑𝐸𝑑𝑥dE/dx threshold can be indicated for a comparability. Under operation with a gasoline achieve of 3000, electron recoils and proton (of C2H6) recoils had been clearly noticed in response to their dE/dx𝑑𝐸𝑑𝑥dE/dx. However, in the operation of the gas acquire of 900, the C and Ar recoils and some proton recoils have been observed due to the excessive dE/dx𝑑𝐸𝑑𝑥dE/dx threshold. The measured observe length of occasions when the GEM voltage was set to 215 V (gasoline gain of 4500) and ninety five V (gasoline acquire of 800) are shown in Fig.4. We efficiently confirmed the nuclear recoils in a hundred and fifty Torr of Ar-C2H6 (90:10) and CF4 gases in response to their dE/dx𝑑𝐸𝑑𝑥dE/dx by changing the detector threshold. By way of dE/dx𝑑𝐸𝑑𝑥dE/dx, the tracks within the micro TPC were much simpler to detect for C, F or Ar recoils. Ultimately, our concern is the recoil route of such nuclei below 100 keV to allow us to observe the alerts of WIMPs. In order to acquire longer tracks and clear Bragg curves, higher gasoline gain operations at lower pressures with low-vitality neutron beams are wanted. The measurement of the incident neutron power with Time-Of-Flight might also be useful to look at the quenching issue of nuclear ionization in the micro-TPC.
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