Data acquisition system for dark matter detectors
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Progress in Ge detector technology has resulted in ultralow backgrounds of less than 0.3 counts keV−1 kg−1 d−1 at energies between 5 and 12 keV, and less than 1.0 counts kev−1 kg−1 d−1 for energies between 3 and 5 keV. Coupled with good energy resolution, 0.4 keV FWHM at 10 keV, this allows searches for DM particles with m ≥8 GeV/c2.
Electromagnetic interference and acoustical pick-up are the main sources of background in the best Ge detectors. These problems are even more important in cryogenic WIMP detectors under development. A PC-based on line pulse shape analysis system is presented which permits rejection of about 95% percent of the EMI/ acoustical background. The hardware uses a low cost, commercially available digital storage oscilloscope. The software consists of about 20,000 lines of code in Pascal and assembly language. We tested this system using a low radioactive background Ge-system on the Earth's surface. For low energy events (27 keV photons) this system permits improvement in the background from 0.1 cpm to 2 cpd.
KeywordsDark Matter Assembly Language Storage Oscilloscope Matter Detector Digital Storage Oscilloscope
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- 1).A.K. Drukier, L. Stodolsky, Phys. Rev.D30, 2296 (1984); M.W. Goodman and E. Witten,Phys. Rev. D31, 3059 (1985); I. Wasserman, Phys. Rev.D32, 2071 (1986); A.K. Drukier, Acta Physica Polonica,B17, 229 (1986).Google Scholar
- 2).R.L. Brodzinski, H.S. Miley, J.H. Reeves, F.T. Avignone “Further Reduction of Radioactive Backgrounds in Ultrasensitive Germanium Spectrometers”, Nucl. Instr. Meth. 1991.Google Scholar
- 3).S.P. Ahlen, F.T. Avignone, R.L. Brodzinski, A.K. Drukier, G. Gelmini, D.N. Spergel, Physics Letters B,195, 603–608 (1987).Google Scholar
- 4).A.K. Drukier, K. Freese, D. Spergel, Phys. Rev.D33, 3495 (1986).Google Scholar
- 5).See contributions of USC/PNL and UZ/USC/PNL collaboration in Proceedings of TAUP, Toledo, September 1991.Google Scholar