Development of Gaseous Tracking Devices for the Search Of WIMPs > 자유게시판

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The Time Projection Chamber (TPC) has been recognized as a probably powerful detector for the search of WIMPs by measuring the directions of nuclear recoils, through which essentially the most convincing signature of WIMPs, brought on by the Earth’s motion across the Galaxy, pet tracking device appears. We report on the first results of a efficiency examine of the neutron exposure of our prototype micro TPC with Ar-C2H6 (90:10) and itagpro tracker CF4 gas at one hundred fifty Torr. These particles might be detected instantly by measuring the nuclear recoils produced by their elastic scattering off nuclei in detectors. Probably the most convincing signature of WIMPs appears in the instructions of nuclear recoils. For the reason that vitality deposits of WIMPs to nuclei are only a few tens of keV and itagpro tracker the vary of nuclei is limited, the micro-TPC should be operated at low pressures. In the current work, in an effort to look at the response of the micro-TPC to nuclear recoils at low pressures as a first step, we irradiated a a hundred and fifty Torr Ar-C2H6 (90:10 mixture) fuel (considered one of the standard gases for TPCs) and CF4 with neutrons from 252Cf. The observe lengths and deposited energies of Ar, C, and iTagPro tracker F recoils have been investigated.

The prototype micro-TPC used on this measurements is shown 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 one hundred MHz 8bit flash ADCs in order to determine the deposited power and the observe route because the waveforms hold the Bragg curve shapes. Ar-C2H6 (90:10) or CF4 gasoline to a pressure of a hundred and fifty Torr and sealed at some stage in the measurement. For measuring the fuel achieve and the vitality calibration, the gas was irradiated with 109Cd 22 keV and 133Ba 31.Zero keV X-rays by way of a 1mm thick aluminum window close to the sensitive volume. 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 as the event trigger. PIC and GEM with a relatively low gasoline acquire (under 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 capable of measure the 109Cd 22 keV x-ray appropriately due to a mismatch of the dynamic vary of the ASD chips and the flash ADC; subsequently, ItagPro the deposited vitality in low-gain operations was extrapolated from the calibrations with the excessive gasoline gain operations. We evaluated the track length as a function of the measured electron equal vitality in the next manner. E/dx????????????????dE/dx threshold is also indicated for a comparison. Under operation with a fuel achieve of 3000, electron recoils and proton (of C2H6) recoils were clearly noticed based on their dE/dx????????????????dE/dx. Alternatively, within the operation of the gasoline gain of 900, iTagPro tracker the C and Ar recoils and some proton recoils have been noticed because of the excessive dE/dx????????????????dE/dx threshold. The measured track size of occasions when the GEM voltage was set to 215 V (fuel gain of 4500) and 95 V (gasoline achieve of 800) are shown in Fig.4. We efficiently showed the nuclear recoils in a hundred and fifty Torr of Ar-C2H6 (90:10) and CF4 gases in keeping with their dE/dx????????????????dE/dx by changing the detector threshold. By way of dE/dx????????????????dE/dx, the tracks within the micro TPC have been a lot easier to detect for iTagPro tracker C, F or Ar recoils. Ultimately, our concern is the recoil route of such nuclei below one hundred keV to allow us to observe the indicators of WIMPs. So as to obtain longer tracks and ItagPro clear Bragg curves, greater gasoline acquire operations at decrease pressures with low-vitality neutron beams are needed. The measurement of the incident neutron vitality with Time-Of-Flight could even be useful to examine the quenching factor of nuclear ionization within the micro-TPC.

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