Custom HPD readout for the CMS HCAL Cushman, P; Heering, A; Ronzhin, A
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
03/2000, Letnik:
442, Številka:
1-3
Journal Article
Recenzirano
Over 10000 channels from the CMS tile/fiber hadronic calorimeter (The CMS Hadron Calorimeter TDR, CERN/LHCC 97-31, June 20, 1997) will be read out by custom 19 and 73-channel HPD's in a 4T field. ...Experimental constraints on the tube design have produced a faster tube with a larger active area and minimum accelerating gap. Quality assurance stations have been developed for fast processing of 600 tubes. Registration to 50μm is done in situ, providing a custom collar with alignment pins which can be mated to a universal cookie. Lifetime measurements reveal details on aging, but operation is within CMS specifications.
The anomalous magnetic moment of the negative muon has been measured to a precision of 0.7 ppm (ppm) at the Brookhaven Alternating Gradient Synchrotron. This result is based on data collected in ...2001, and is over an order of magnitude more precise than the previous measurement for the negative muon. The result a(mu(-))=11 659 214(8)(3) x 10(-10) (0.7 ppm), where the first uncertainty is statistical and the second is systematic, is consistent with previous measurements of the anomaly for the positive and the negative muon. The average of the measurements of the muon anomaly is a(mu)(exp)=11 659 208(6) x 10(-10) (0.5 ppm).
Low-threshold analysis of CDMS shallow-site data Akerib, D. S.; Attisha, M. J.; Baudis, L. ...
Physical review. D, Particles, fields, gravitation, and cosmology,
12/2010, Letnik:
82, Številka:
12
Journal Article
Wishing Away History Gilford, Peter; Cushman, Philip
The American psychologist,
09/2001, Letnik:
56, Številka:
9
Journal Article
Recenzirano
Responds to the comment by M. F. Hoyt (see record 2001-18061-014) on the article by P. Gilford and P. Cushman (see record 2000-05933-002). It is argued that Hoyt did not grasp the synchronistic ...connection between managed care's practices and its implications for current understandings of human being. The authors believe that either Hoyt did not fully understand their concerns or he is unable to apply them to his own theory. It is maintained that Hoyt's comments demonstrate how difficult it is for psychologists to think historically and critically about their practice. (PsycINFO Database Record (c) 2016 APA, all rights reserved)
Future direct searches for low-mass dark matter particles with germanium detectors, such as SuperCDMS SNOLAB, are expected to be limited by backgrounds from radioactive isotopes activated by ...cosmogenic radiation inside the germanium. There are limited experimental data available to constrain production rates and a large spread of theoretical predictions. We examine the calculation of expected production rates, and analyze data from the second run of the CDMS low ionization threshold experiment (CDMSlite) to estimate the rates for several isotopes. We model the measured CDMSlite spectrum and fit for contributions from tritium and other isotopes. Using the knowledge of the detector history, these results are converted to cosmogenic production rates at sea level. The production rates in atoms/(kg · day) are 74 ± 9 for 3H, 1.5 ± 0.7 for 55Fe, 17 ± 5 for 65Zn, and 30 ± 18 for 68Ge.
Crosstalk properties of the CMS HCAL hybrid photodiode Cushman, P.; Heering, A.H.; Pearson, N. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
05/2003, Letnik:
504, Številka:
1-3
Journal Article
Recenzirano
The requirements of large dynamic range, 40MHz readout and 4T magnetic field of the CMS Hadronic calorimeter have led to the development of a custom Hybrid PhotoDiode (HPD). In the last 5 years many ...improvements have been made in cooperation with DEP11B.V. Delft Electronische Producten, Roden, Netherlands. and Canberra22Canberra Semiconductor N.V., Olen, Belgium. to the basic HPD concept to improve the performance. A 200-μm thick 19-channel PIN diode array with various surface treatments has been developed to ensure fast pulse behavior and low optical and capacitive crosstalk.
Weakly Interacting Massive Particles (WIMPs) are a strong candidate for the Cold Dark Matter of the Universe. CDMS-II is a direct-search WIMP search experiment, operating at 50 mK and housed at the ...Soudan mine, Minnesota. The 250 gram Ge detectors utilize athermal phonon sensors where tungsten transition edge sensors are operated in negative electrothermal feedback. The search at Soudan is ongoing with an expected final reach of CDMS-II by the end of 2008 of a WIMP-nucleon cross-section sensitivity of 2.1 x10-44 cm2, at a WIMP mass of 60 GeV/c2. To proceed further, we have proposed the SuperCDMS program.
Electromagnetic calorimeters for the BNL muon ( g−2) experiment Sedykh, S.A; Blackburn, J.R; Bunker, B.D ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
12/2000, Letnik:
455, Številka:
2
Journal Article
Recenzirano
A set of 24 lead/scintillating fiber electromagnetic calorimeters has been constructed for the new muon (
g−2) experiment at the Brookhaven AGS. These calorimeters were designed to provide very good ...energy resolution for electrons up to 3 GeV while also yielding excellent timing information. Special requirements in the experiment related to the uniformity of response, the short-term gain and timing stability, and the neutron background led to several unusual design features. The calorimeters were tested and calibrated with electrons in the energy range 0.5–4.0 GeV and have been installed and used in the muon storage ring. The design criteria, construction, and performance of the system are described.
Present Status of the SuperCDMS program Akerib, D. S.; Bailey, C. N.; Bauer, D. A. ...
Journal of low temperature physics,
05/2008, Letnik:
151, Številka:
3-4
Journal Article
Recenzirano
The expected final reach of the Weakly Interacting Massive Particle (WIMP) search experiment CDMS-II by the end of 2007 is a WIMP-nucleon cross-section sensitivity of 2.1×10
−44
cm
2
. To proceed ...further in our search, we have proposed the SuperCDMS Phase A project that would deploy 42 1-inch thick Ge detectors, at a site deeper than the location of CDMS II, and reach a desired sensitivity goal of 1.3×10
−45
cm
2
. These cross-sections are of interest and are complementary to Supersymmetry searches at the Large Hadron Collider (LHC) and future linear colliders.
Nuclear-recoil energy scale in CDMS II silicon dark-matter detectors Agnese, R.; Anderson, A.J.; Aramaki, T. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
10/2018, Letnik:
905, Številka:
C
Journal Article
Recenzirano
Odprti dostop
The Cryogenic Dark Matter Search (CDMS II) experiment aims to detect dark matter particles that elastically scatter from nuclei in semiconductor detectors. The resulting nuclear-recoil energy ...depositions are detected by ionization and phonon sensors. Neutrons produce a similar spectrum of low-energy nuclear recoils in such detectors, while most other backgrounds produce electron recoils. The absolute energy scale for nuclear recoils is necessary to interpret results correctly. The energy scale can be determined in CDMS II silicon detectors using neutrons incident from a broad-spectrum 252Cf source, taking advantage of a prominent resonance in the neutron elastic scattering cross section of silicon at a recoil (neutron) energy near 20 (182)keV. Results indicate that the phonon collection efficiency for nuclear recoils is 4.8−0.9+0.7% lower than for electron recoils of the same energy. Comparisons of the ionization signals for nuclear recoils to those measured previously by other groups at higher electric fields indicate that the ionization collection efficiency for CDMS II silicon detectors operated at ∼4V/cm is consistent with 100% for nuclear recoils below 20keV and gradually decreases for larger energies to ∼75% at 100keV. The impact of these measurements on previously published CDMS II silicon results is small.
•The phonon collection efficiency of nuclear recoils is ∼95% that for electron recoils.•The effect on the WIMP-nucleon cross-section exclusion curve is small.•Nuclear-recoil ionization collection decreases from 100% above 20 keV.
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