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Search Results: 1 - 10 of 297300 matches for " J. Krider "
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A Regenerable Filter for Liquid Argon Purification
A. Curioni,B. T. Fleming,W. Jaskierny,C. Kendziora,J. Krider,S. Pordes,M. Soderberg,J. Spitz,T. Tope,T. Wongjirad
Physics , 2009, DOI: 10.1016/j.nima.2009.04.020
Abstract: A filter system for removing electronegative impurities from liquid argon is described. The active components of the filter are adsorbing molecular sieve and activated-copper-coated alumina granules. The system is capable of purifying liquid argon to an oxygen-equivalent impurity concentration of better than 30 parts per trillion, corresponding to an electron drift lifetime of at least 10 ms. Reduction reactions that occur at about 250 degrees Celsius allow the filter material to be regenerated in-situ through a simple procedure. In the following work we describe the filter design, performance, and regeneration process.
A New Proton CT Scanner
G. Coutrakon,G. Blazey,S. Boi,A. Dyshkant,B. Erdelyi,D. Hedin,E. Johnson,J. Krider,V. Rykalin,S. A. Uzunyan,V. Zutshi,R. Fordt,G. Sellberg,J . E. Rauch,M. Roman,P. Rubinov,P. Wilson,M. Naimuddin
Physics , 2014,
Abstract: The design, construction, and preliminary testing of a second generation proton CT scanner is presented. All current treatment planning systems at proton therapy centers use X-ray CT as the primary imaging modality for treatment planning to calculate doses to tumor and healthy tissues. One of the limitations of X-ray CT is in the conversion of X-ray attenuation coefficients to relative (proton) stopping powers, or RSP. This results in more proton range uncertainty, larger target volumes and therefore, more dose to healthy tissues. To help improve this, we present a novel scanner capable of high dose rates, up to 2~MHz, and large area coverage, 20~x~24~cm$^2$, for imaging an adult head phantom and reconstructing more accurate RSP values.
Development of a proton Computed Tomography Detector System
Md. Naimuddin,G. Coutrakon,G. Blazey,S. Boi,A. Dyshkant,B. Erdelyi,D. Hedin,E. Johnson,J. Krider,V. Rukalin,S. A. Uzunyan,V. Zutshi,R. Fordt,G. Sellberg,J. E. Rauch,M. Roman,P. Rubinov,P. Wilson
Physics , 2015,
Abstract: Computer tomography is one of the most promising new methods to image abnormal tissues inside the human body. Tomography is also used to position the patient accurately before radiation therapy. Hadron therapy for treating cancer has become one of the most advantageous and safe options. In order to fully utilize the advantages of hadron therapy, there is a necessity of performing radiography with hadrons as well. In this paper we present the development of a proton computed tomography system. Our second-generation proton tomography system consists of two upstream and two downstream trackers made up of fibers as active material and a range detector consisting of plastic scintillators. We present details of the detector system, readout electronics, and data acquisition system as well as the commissioning of the entire system. We also present preliminary results from the test beam of the range detector.
Development of a proton Computed Tomography (pCT) scanner at NIU
S. A. Uzunyan,G. Blazey,S. Boi,G. Coutrakon,A. Dyshkant,B. Erdelyi,A. Gearhart,D. Hedin,E. Johnson,J. Krider,V. Zutshi,R. Ford,T. Fitzpatrick,G. Sellberg,J. E. Rauch,M. Roman,P. Rubinov,P. Wilson,K. Lalwani,M. Naimuddin
Physics , 2013,
Abstract: We describe the development of a proton Computed Tomography (pCT) scanner at Northern Illinois University (NIU) in collaboration with Fermilab and Delhi University. This paper provides an overview of major components of the scanner and a detailed description of the data acquisition system (DAQ).
The design, construction and performance of the MICE scintillating fibre trackers
M. Ellis,P. R. Hobson,P. Kyberd,J. J. Nebrensky,A. Bross,J. Fagan,T. Fitzpatrick,R. Flores,R. Kubinski,J. Krider,R. Rucinski,P. Rubinov,C. Tolian,T. L. Hart,D. M. Kaplan,W. Luebke,B. Freemire,M. Wojcik,G. Barber,D. Clark,I. Clark,P. J. Dornan,A. Fish,S. Greenwood,R. Hare,A. Jamdagni,V. Kasey,M. Khaleeq,J. Leaver,K. R. Long,E. McKigney,T. Matsushita,C. Rogers,T. Sashalmi,P. Savage,M. Takahashi,A. Tapper,K. Yoshimura,P. Cooke,R. Gamet,H. Sakamoto,Y. Kuno,A. Sato,T. Yano,M. Yoshida,C. MacWaters,L. Coney,G. Hanson,A. Klier,D. Cline,X. Yang,D. Adey
Physics , 2010, DOI: 10.1016/j.nima.2011.04.041
Abstract: Charged-particle tracking in the international Muon Ionisation Cooling Experiment (MICE) will be performed using two solenoidal spectrometers, each instrumented with a tracking detector based on 350 {\mu}m diameter scintillating fibres. The design and construction of the trackers is described along with the quality-assurance procedures, photon-detection system, readout electronics, reconstruction and simulation software and the data-acquisition system. Finally, the performance of the MICE tracker, determined using cosmic rays, is presented.
New components of the mercury’s perihelion precession  [PDF]
J. J. Smulsky
Natural Science (NS) , 2011, DOI: 10.4236/ns.2011.34034
Abstract: The velocity of perihelion rotation of Mercury's orbit relatively motionless space is computed. It is prove that it coincides with that calculated by the Newtonian interaction of the planets and of the compound model of the Sun’s rotation.
Simple General Purpose Ion Beam Deceleration System Using a Single Electrode Lens  [PDF]
J. Lopes, J. Rocha
World Journal of Engineering and Technology (WJET) , 2015, DOI: 10.4236/wjet.2015.33014
Abstract: Ion beam deceleration properties of a newly developed low-energy ion beam implantation system were studied. The objective of this system was to produce general purpose low-energy (5 to 15 keV) implantations with high current beam of hundreds of μA level, providing the most wide implantation area possible and allowing continuously magnetic scanning of the beam over the sample(s). This paper describes the developed system installed in the high-current ion implanter at the Laboratory of Accelerators and Radiation Technologies of the Nuclear and Technological Cam-pus, Sacavém, Portugal (CTN).
Constraints on velocity anisotropy of spherical systems with separable augmented densities
J. An
Physics , 2011, DOI: 10.1088/0004-637X/736/2/151
Abstract: If the augmented density of a spherical anisotropic system is assumed to be multiplicatively separable to functions of the potential and the radius, the radial function, which can be completely specified by the behavior of the anisotropy parameter alone, also fixes the anisotropic ratios of every higher-order velocity moment. It is inferred from this that the non-negativity of the distribution function necessarily limits the allowed behaviors of the radial function. This restriction is translated into the constraints on the behavior of the anisotropy parameter. We find that not all radial variations of the anisotropy parameter satisfy these constraints and thus that there exist anisotropy profiles that cannot be consistent with any separable augmented density.
On the augmented density of a spherical anisotropic dynamic system
J. An
Physics , 2010, DOI: 10.1111/j.1365-2966.2011.18324.x
Abstract: This paper presents a set of new conditions on the augmented density of a spherical anisotropic system that is necessary for the underlying two-integral phase-space distribution function to be non-negative. In particular, it is shown that the partial derivatives of the Abel transformations of the augmented density must be non-negative. Applied for the separable augmented densities, this recovers the result of van Hese et al. (2011).
Fractional calculus, completely monotonic functions, a generalized Mittag-Leffler function and phase-space consistency of separable augmented densities
J. An
Physics , 2012,
Abstract: Under the separability assumption on the augmented density, a distribution function can be always constructed for a spherical population with the specified density and anisotropy profile. Then, a question arises, under what conditions the distribution constructed as such is non-negative everywhere in the entire accessible subvolume of the phase-space. We rediscover necessary conditions on the augmented density expressed with fractional calculus. The condition on the radius part R(r^2) -- whose logarithmic derivative is the anisotropy parameter -- is equivalent to R(1/w)/w being a completely monotonic function whereas the condition on the potential part is stated as its derivative up to the order not greater than 3/2-b being non-negative (where b is the central limiting value for the anisotropy parameter). We also derive the set of sufficient conditions on the separable augmented density for the non-negativity of the distribution, which generalizes the condition derived for the generalized Cuddeford system by Ciotti & Morganti to arbitrary separable systems. This is applied for the case when the anisotropy is parameterized by a monotonic function of the radius of Baes & Van Hese. The resulting criteria are found based on the complete monotonicity of generalized Mittag-Leffler functions.
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