scholarly journals Development of a low-mass and high-efficiency charged-particle detector

2016 ◽  
Vol 2016 (2) ◽  
pp. 023C01 ◽  
Author(s):  
D. Naito ◽  
Y. Maeda ◽  
N. Kawasaki ◽  
T. Masuda ◽  
H. Nanjo ◽  
...  
Keyword(s):  
Charged Particle ◽  
High Efficiency ◽  
Particle Detector ◽  
Low Mass

High efficiency neutron and charged particle spectrometers

1991 ◽  
Author(s):  
J. Bart Czirr ◽  
Gary L. Jensen ◽  
J. C. Wang
Keyword(s):  
Charged Particle ◽  
High Efficiency

Time-calibration of the semiconductor charged particle detector using the ThC' α-particle source

1975 ◽  
Vol 127 (4) ◽  
pp. 601-602
Author(s):  
M. Matoba ◽  
J. Niidome ◽  
Y. Matsumoto ◽  
H. Yamamoto ◽  
N. Koori
Keyword(s):  
Charged Particle ◽  
Particle Detector ◽  
Particle Source ◽  
Time Calibration

scholarly journals Charged particle spectra from U-235 and B-10 micropellets and slab coatings

1984 ◽  
Vol 2 (2) ◽  
pp. 201-211 ◽  
Author(s):  
A. K. Chung ◽  
M. A. Prelas
Keyword(s):  
Charged Particle ◽  
Low Power ◽  
Power Density ◽  
Fission Fragment ◽  
High Efficiency ◽  
Nuclear Reactions ◽  
Length Distribution ◽  
Laser Medium ◽  
Fissile Material ◽  
Particle Spectrum

A novel method of utilizing fluorescence generated from the products of nuclear reactions offers the prospect of compact, high efficiency, multi-megajoule lasers. To overcome the problems associated with traditional laser (or energy converter)-fissile material interfaces, such as a uranium coating (low power density and low efficiency) or a gaseous uranium compound (low power density and deleterious effects on the laser kinetics and photon transport), a method suggested elsewhere of employing a reactor using a uranium aerosol fuel, interspersed with a fluorescer medium, is briefly reviewed. The charged particles produced by nuclear reactions in the fuel produce fluorescence in the core region of the reactor, through interactions with the fluorescer. This fluorescence can then be concentrated, to increase the effective power density in the laser medium, and used to drive a photolytic laser.One key issue in the above process is the charged particle spectrum from the fissile aerosol. These issues can be addressed theoretically based on the Dirac chord length distribution technique and an Arcen's function. The charged particle spectrum from a UO2 coating has been generated and benchmarked with the experimental data of Kahn et al., and Redmond et al. Agreement is generally good except near the end of the fission fragment tracks. The validity of this simple technique in approximating the rate of ion energy loss lends confidence to the generation of fission fragment spectra for other geometries (i.e. spherical in which transport efficiencies of over 60% appear achievable) using U, UO2 and U3O8. Work is also extended to the case of B-10 in a variety of configurations which are frequently used in modern energy conversion experimental devices.

scholarly journals The Mt John University Observatory search for Earth-mass planets in the habitable zone of α Centauri

2014 ◽  
Vol 14 (2) ◽  
pp. 305-312 ◽  
Author(s):  
Michael Endl ◽  
Christoph Bergmann ◽  
John Hearnshaw ◽  
Stuart I. Barnes ◽  
Robert A. Wittenmyer ◽  
...  
Keyword(s):  
High Efficiency ◽  
Detection Sensitivity ◽  
Habitable Zone ◽  
Echelle Spectrograph ◽  
Planet Detection ◽  
The Past ◽  
Temporal Sampling ◽  
Habitable Zones ◽  
Low Mass ◽  
Advanced Version

AbstractThe ‘holy grail’ in planet hunting is the detection of an Earth-analogue: a planet with similar mass as the Earth and an orbit inside the habitable zone. If we can find such an Earth-analogue around one of the stars in the immediate solar neighbourhood, we could potentially even study it in such great detail to address the question of its potential habitability. Several groups have focused their planet detection efforts on the nearest stars. Our team is currently performing an intensive observing campaign on the α Centauri system using the High Efficiency and Resolution Canterbury University Large Échelle Spectrograph (Hercules) at the 1 m McLellan telescope at Mt John University Observatory in New Zealand. The goal of our project is to obtain such a large number of radial velocity (RV) measurements with sufficiently high temporal sampling to become sensitive to signals of Earth-mass planets in the habitable zones of the two stars in this binary system. Over the past few years, we have collected more than 45 000 spectra for both stars combined. These data are currently processed by an advanced version of our RV reduction pipeline, which eliminates the effect of spectral cross-contamination. Here we present simulations of the expected detection sensitivity to low-mass planets in the habitable zone by the Hercules programme for various noise levels. We also discuss our expected sensitivity to the purported Earth-mass planet in a 3.24-day orbit announced by Dumusque et al. (2012).

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