Development Of Gaseous Tracking Devices For The Search Of WIMPs

The Time Projection Chamber (TPC) has been acknowledged as a doubtlessly highly effective detector ItagPro for the search of WIMPs by measuring the directions of nuclear recoils, by which the most convincing signature of WIMPs, brought on by the Earth’s motion across the Galaxy, seems. 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 150 Torr. These particles could be detected instantly 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. Since the power deposits of WIMPs to nuclei are only some tens of keV and ItagPro the range of nuclei is limited, the micro-TPC must be operated at low pressures. In the present work, with a view to look at the response of the micro-TPC to nuclear recoils at low pressures as a first step, we irradiated a 150 Torr Ar-C2H6 (90:10 mixture) fuel (one of the standard gases for TPCs) and CF4 with neutrons from 252Cf. The track lengths and deposited energies of Ar, C, and F recoils had been investigated.



The prototype micro-TPC used in this measurements is proven in Fig.1. PIC and GEM. The details of this GEM are described in Refs. The pre-amplified alerts are summed and digitized by 100 MHz 8bit flash ADCs so as to find out the deposited power and the observe direction because the waveforms hold the Bragg curve shapes. Ar-C2H6 (90:10) or CF4 gasoline to a strain of 150 Torr and sealed all through the measurement. For measuring the gasoline acquire and the vitality calibration, the gas was irradiated with 109Cd 22 keV and 133Ba 31.0 keV X-rays by a 1mm thick aluminum window near the sensitive quantity. We irradiated the micro-TPC with neutrons from a 1 MBq 252Cf supply on the highest of the vessel. 2 cm3 plastic scintillator have been used because the event set off. PIC and GEM with a quite low fuel gain (below 1000) with a view to observe the nuclear recoils.



PIC and adjusted the voltage between the GEM electrodes. Below a fuel gain of about 2000, our system was not able to measure the 109Cd 22 keV x-ray accurately as a result of a mismatch of the dynamic range of the ASD chips and the flash ADC; subsequently, the deposited power in low-gain operations was extrapolated from the calibrations with the high gas acquire operations. We evaluated the monitor length as a operate of the measured electron equal power in the following approach. E/dx𝑑𝐸𝑑𝑥dE/dx threshold is also indicated for a comparability. Under operation with a gasoline gain of 3000, electron recoils and proton (of C2H6) recoils were clearly noticed in accordance with their dE/dx𝑑𝐸𝑑𝑥dE/dx. Alternatively, within the operation of the gas achieve of 900, the C and Ar recoils and some proton recoils had been noticed due to the high dE/dx𝑑𝐸𝑑𝑥dE/dx threshold. The measured monitor size of occasions when the GEM voltage was set to 215 V (gas gain of 4500) and ninety five V (gas gain of 800) are shown in Fig.4. We efficiently showed the nuclear recoils in 150 Torr of Ar-C2H6 (90:10) and CF4 gases in keeping with their dE/dx𝑑𝐸𝑑𝑥dE/dx by altering the detector threshold. In terms of dE/dx𝑑𝐸𝑑𝑥dE/dx, the tracks within the micro TPC have been a lot easier to detect for C, F or Ar recoils. Ultimately, our concern is the recoil route of such nuclei below one hundred keV to permit us to observe the alerts of WIMPs. In order to obtain longer tracks and clear Bragg curves, larger gas acquire operations at lower pressures with low-energy neutron beams are needed. The measurement of the incident neutron vitality with Time-Of-Flight might even be helpful to examine the quenching factor of nuclear ionization in the micro-TPC.



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