The Cryogenic Dark Matter Search (CDMS-II) Experiment : by Clarence Leeder Chang; Fermi National Accelerator
By Clarence Leeder Chang; Fermi National Accelerator Laboratory.; United States. Dept. of Energy.; United States. Dept. of Energy. Office of Scientific and Technical Information
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Additional resources for The Cryogenic Dark Matter Search (CDMS-II) Experiment : First Results from the Soudan Mine
Example text
The configuration is essentially a low pass filter which begins to roll off at a frequency ∼ R 2πL where L is the inductance of the input coil and R is the resistance of the TES. 25 Ohm, the corresponding roll off is ∼160 kHz as shown in Fig. 5. This roll off means that the input coil begins to filter away changes with timescales ∼ 1 µs. Biasing a TES lower will result in filtering signals that are on timescales comparable to that of the phonon starttimes. 1 The TESs cannot be biased too low or it will go into electro-thermal oscillations as described in [53, 54] 32 CHAPTER 2.
The neutron simulations have been developed sufficiently so that during Run 19 (CDMSI) and Run 21 (CDMS II) a background subtraction of veto-anticoincident cosmogenic neutrons could be performed. The neutron simulations for the first run at Soudan predict a negligible contamination from unvetoed cosmogenic neutrons. 2 Bulk Electron Recoils - “Gammas” The majority of backgrounds are rejected on an event by event basis by a cut on the ionization yield parameter. The cut is implemented as a definition of two bands: an electron recoil band and a nuclear recoil band, as shown in Fig.
The slight delay due to recombination makes it possible for a signal due to nuclear recoils to be distinguished from a signal due to electron recoils through statistical pulse shape analysis. The ZEPLIN experiment does not see any nuclear recoil signal. However, the robustness of this result is sometimes questioned due to the lack of an in-situ neutron calibration. EDELWEISS and CDMS I The detector technology for EDELWEISS and CDMS I is virtually identical. The target mass is Ge. Electrodes on the detector surface measure the ionization produced by a recoil while thermistors simultaneously measure the heat that is produced.