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[show abstract]
[hide abstract]
ABSTRACT: The Karlsruhe Tritium Neutrino Experiment (KATRIN) will detect tritium beta-
decay electrons that pass through its electromagnetic spectrometer with a
highly- segmented monolithic silicon pin-diode focal-plane detector (FPD). This
pin-diode array will be on a single piece of 500-{\mu}m-thick silicon, with
contact between titanium nitride (TiN) coated detector pixels and front-end
electronics made by spring-loaded pogo pins. The pogo pins will exert a total
force of up to 50N on the detector, deforming it and resulting in mechanical
stress up to 50 MPa in the silicon bulk. We have evaluated a prototype
pin-diode array with a pogo-pin connection scheme similar to the KATRIN FPD. We
find that pogo pins make good electrical contact to TiN and observe no effects
on detector resolution or reverse-bias leakage current which can be attributed
to mechanical stress.
02/2012;
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B. Aharmim,
S N Ahmed, J. F. Amsbaugh,
J. M. Anaya,
A E Anthony,
J. Banar,
N. Barros,
E W Beier,
A Bellerive,
B. Beltran, [......],
J Wendland,
N West,
J.B. Wilhelmy,
J. F. Wilkerson,
J R Wilson,
J.M. Wouters,
A. Wright,
M Yeh,
F Zhang,
K Zuber
[show abstract]
[hide abstract]
ABSTRACT: This paper details the solar neutrino analysis of the 385.17-day Phase-III
data set acquired by the Sudbury Neutrino Observatory (SNO). An array of $^3$He
proportional counters was installed in the heavy-water target to measure
precisely the rate of neutrino-deuteron neutral-current interactions. This
technique to determine the total active $^8$B solar neutrino flux was largely
independent of the methods employed in previous phases. The total flux of
active neutrinos was measured to be
$5.54^{+0.33}_{-0.31}(stat.)^{+0.36}_{-0.34}(syst.)\times 10^{6}$ cm$^{-2}$
s$^{-1}$, consistent with previous measurements and standard solar models. A
global analysis of solar and reactor neutrino mixing parameters yielded the
best-fit values of $\Delta m^2 = 7.59^{+0.19}_{-0.21}\times 10^{-5}{eV}^2$ and
$\theta = 34.4^{+1.3}_{-1.2}$ degrees.
07/2011;
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B Aharmim,
S N Ahmed, J F Amsbaugh,
A E Anthony,
J Banar,
N Barros,
E W Beier,
A Bellerive,
B Beltran,
M Bergevin, [......],
J Wendland,
N West,
J B Wilhelmy,
J F Wilkerson,
J R Wilson,
J M Wouters,
A Wright,
M Yeh,
F Zhang,
K Zuber
[show abstract]
[hide abstract]
ABSTRACT: The Sudbury Neutrino Observatory (SNO) used an array of 3He proportional counters to measure the rate of neutral-current interactions in heavy water and precisely determined the total active (nu_x) 8B solar neutrino flux. This technique is independent of previous methods employed by SNO. The total flux is found to be 5.54_-0.31;+0.33(stat)-0.34+0.36(syst)x10(6) cm(-2) s(-1), in agreement with previous measurements and standard solar models. A global analysis of solar and reactor neutrino results yields Deltam2=7.59_-0.21;+0.19x10(-5) eV2 and theta=34.4_-1.2;+1.3 degrees. The uncertainty on the mixing angle has been reduced from SNO's previous results.
Physical Review Letters 10/2008; 101(11):111301. · 7.37 Impact Factor
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J. F. Amsbaugh,
J. M. Anaya,
J. Banar,
T. J. Bowles,
M. C. Browne,
T V Bullard,
T. H. Burritt,
G. A. Cox-Mobrand,
X Dai,
H Deng, [......],
N Tolich,
B. A. VanDevender,
T. D. Van Wechel,
B L Wall,
H. Wan Chan Tseung,
J Wendland,
N West,
J.B. Wilhelmy,
J. F. Wilkerson,
J.M. Wouters
[show abstract]
[hide abstract]
ABSTRACT: An array of Neutral-Current Detectors (NCDs) has been built in order to make a unique measurement of the total active flux of solar neutrinos in the Sudbury Neutrino Observatory (SNO). Data in the third phase of the SNO experiment were collected between November 2004 and November 2006, after the NCD array was added to improve the neutral-current sensitivity of the SNO detector. This array consisted of 36 strings of proportional counters filled with a mixture of $^3$He and CF$_4$ gas capable of detecting the neutrons liberated by the neutrino-deuteron neutral current reaction in the D$_2$O, and four strings filled with a mixture of $^4$He and CF$_4$ gas for background measurements. The proportional counter diameter is 5 cm. The total deployed array length was 398 m. The SNO NCD array is the lowest-radioactivity large array of proportional counters ever produced. This article describes the design, construction, deployment, and characterization of the NCD array, discusses the electronics and data acquisition system, and considers event signatures and backgrounds.
06/2007;
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[show abstract]
[hide abstract]
ABSTRACT: We have cooled down, multipactor conditioned, tested, helium conditioned, and retested several low beta (0.10) and two high beta (0.21) lead plated copper quarter‐wave resonators. We discuss the choice of the quarter‐wave resonator and of the lead plated copper technology. We describe the fabrication and present our techniques for conditioning the resonators. Performances are presented.
Review of Scientific Instruments 06/1986; · 1.37 Impact Factor
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J. F. Amsbaugh,
R. C. Connolly,
D. T. Corcoran,
J. G. Cramer,
M. A. Howe,
D. W. Storm,
H. E. Swanson,
T. A. Trainor,
R. Vandenbosch,
L. P. Van Houten,
W. G. Weitkamp,
D. I. Will
[show abstract]
[hide abstract]
ABSTRACT: We are approximately half‐way through the construction phase of the superconducting booster linac. Contracts have been placed for all major items, and many of these have been delivered. The high‐beta resonator development has been successful and we are going ahead with construction of these.
Review of Scientific Instruments 04/1986; 57(5):761-762. · 1.37 Impact Factor
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[show abstract]
[hide abstract]
ABSTRACT: We have begun construction of a superconducting linac designed to accelerate ions from protons through about mass 60. Injected by our 9 MV-terminal tandem van de Graaff accelerator, the linac is expected to double the proton energy and quadruple the energies of heavier ions. The resonators are lead plated copper quarter wave structures. The overall layout and expected performance of the accelerator will be presented, along with a brief status report.
IEEE Transactions on Nuclear Science 11/1985; · 1.45 Impact Factor
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[show abstract]
[hide abstract]
ABSTRACT: The University of Washington superconducting linac uses lead-plated copper quarter-wave resonators for acceleration. These accept a wide range of particle velocities. There are 24 accelerating resonators with β = 0.1 and 12 resonators with β = 0.2, as well as a bunching resonator with β = 0.1 and a rebuncher/debuncher with β = 0.2. These β values are higher than those of other similar machines, reflecting our emphasis on lighter ions. We are able to accelerate ions with masses ranging from 1 through above 60.The linas has been in operation since September 1987. During the early part of this period of operation various systems were completed and debugged, and during the remaining part of the period we have been running fairly routinely while gaining experience and skill in operation. Following a brief description of the accelerator, the operating experience, techniques, and automatic control features will be described in detail.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment.
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J.F. Amsbaugh,
J.M. Anaya,
J. Banar,
T.J. Bowles,
M.C. Browne,
T.V. Bullard,
T.H. Burritt,
G.A. Cox-Mobrand,
X. Dai,
H. Deng, [......],
N. Tolich,
B.A. VanDevender,
T.D. Van Wechel,
B.L. Wall,
H. Wan Chan Tseung,
J. Wendland,
N. West,
J.B. Wilhelmy,
J.F. Wilkerson,
J.M. Wouters
[show abstract]
[hide abstract]
ABSTRACT: An array of Neutral-Current Detectors (NCDs) has been built in order to make a unique measurement of the total active flux of solar neutrinos in the Sudbury Neutrino Observatory (SNO). Data in the third phase of the SNO experiment were collected between November 2004 and 2006, after the NCD array was added to improve the neutral-current sensitivity of the SNO detector. This array consisted of 36 strings of proportional counters filled with a mixture of 3He and CF4 gas capable of detecting the neutrons liberated by the neutrino-deuteron neutral-current reaction in the D2O, and four strings filled with a mixture of 4He and CF4 gas for background measurements. The proportional counter diameter is 5 cm. The total deployed array length was 398 m. The SNO NCD array is the lowest-radioactivity large array of proportional counters ever produced. This article describes the design, construction, deployment, and characterization of the NCD array, discusses the electronics and data acquisition system, and considers event signatures and backgrounds.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment.
