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in creator/contributor: "Green, M.A."

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A heat exchanger between forced flow helium gas at 14 to 18 K andliquid hydrogen at 20 K circulated by natural convection

The Muon Ionization Cooling Experiment (MICE) has three 350-mm long liquid hydrogen absorbers to reduce the momentum of 200 MeV muons in all directions. The muons are then re-accelerated in the longitudinal direction by 200 MHz RF cavities. The result is cooled muons with a reduced emittance. The energy from the muons is taken up by the liquid hydrogen in the absorber. The hydrogen in the MICE absorbers is cooled by natural convection to the walls of the absorber that are in turn cooled by heli… more

Date: September 15, 2003

Creator: Green, M. A.; Ishimoto, S.; Lau, W. & Yang, S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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An alternate method for designing dipole magnet ends

Small bore superconducting dipole magnets, such as those for the SSC, often have problems in the ends. These problems can often be alleviated by spreading out the end windings so that the conductor sees less deformation. This paper presents a new procedure for designing dipole magnet ends which can be applied to magnets with either cylindrical or conical bulged ends to have integrated field multipoles which meet the constraints imposed by the SSC lattice. The method described here permits one t… more

Date: August 1, 1988

Creator: Pope, W. L.; Green, M. A.; Peters, C.; Caspi, S. & Taylor, C. E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Various magnet options for Delta launched version of ASTROMAG

This report compares various superconducting magnet options for use in a particle astrophysics experiment to be launched with a Delta rocket into a sun synchronous orbit and an earth trailing solar orbit. The goals of the experiment are to study the incidence of anti particles coming from deep space and to study populations of light nuclei (up to atomic number 8) and gammas from deep space. The proposed superconducting coils, which would be made with an aluminum stabilized niobium titanium supe… more

Date: July 1, 1993

Creator: Green, M. A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Reduced mass persistent switches for large superconducting magnets in space

Superconducting magnets in space must operate in the persistent mode. This paper describes the characteristics of low mass niobium titanium persistent switches for low mass superconducting magnets which are designed to quench protect themselves through the quench back process. (The whole coil is driven normal shortly after the quench has started and the magnet stored energy is taken up by the coil and the persistent switch.) The concept Of using a resistor and diode in parallel with the persist… more

Date: August 1, 1992

Creator: Green, M. A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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A comparison of the Space Station version of ASTROMAG with two free-flyer versions

This Report compares the Space Station version of ASTROMAG with free-flyer versions of ASTROMAG which could fly on an Atlas lla rocket and a Delta rocket. Launch with either free-flyer imposes severe weight limits on the magnet and its cryogenic system. Both versions of ASTROMAG magnet which fly on free-flying satellites do not have to be charged more than once during the mission. This permits one to simplify the charging system and the cryogenic system. The helium ll pump loop which supplies h… more

Date: June 1992

Creator: Green, M. A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Superconducting magnet system for the SPIRIT cosmic ray space telescope

The SPIRIT (A Superconducting Passive Iron Isotope Telescope) experiment requires a large volume (1m/sup 3/) of 2T field in order to achieve enough resolution to study heavy primary cosmic rays. It is proposed that the SPIRIT superconducting magnet system and its experimental package would be used in one of the space shuttles. The superconducting magnet design is based on Lawrence Berkeley Laboratory thin high current density solenoid technology. The superconducting magnet system consists of a … more

Date: August 1, 1979

Creator: Green, M.A.; DeOlivares, J.M.; Tarle, G.; Price, P.B. & Shirk, E.K.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Three dimensional field calculations for a Short Superconducting Dipole for the UCLA Ultra Compact Synchrotron

The Ultra Compact Synchrotron (UCS), proposed for UCLA, is a compact 1.5 GeV electron light source with superconducting magnets to produce X rays with a critical energy of about 10 keV. The design physical length (cold length) for the dipole is 418 mm. The synchrotron requires that a uniform field be produced in a region that is 180 mm wide by 40 mm high by about 380 mm long. The end regions of the dipole should be short compared to the overall length of the dipole field region. A Vobly H type … more

Date: August 1, 1998

Creator: Green, M.A. & Taylor, C.E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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High field solenoids for muon cooling

The proposed cooling system for the muon collider will consist of a 200 meter long line of alternating field straight solenoids interspersed with bent solenoids. The muons are cooled in all directions using a 400 mm long section liquid hydrogen at high field. The muons are accelerated in the forward direction by about 900 mm long, 805 MHz RF cavities in a gradient field that goes from 6 T to -6 T in about 300 mm. The high field section in the channel starts out at an induction of about 2 T in t… more

Date: September 8, 1999

Creator: Green, M. A.; Eyssa, Y.; Kenny, S.; Miller, J. R. & Prestemon, S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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A Four Cell Lattice for the UCLA Compact Light Source Synchrotron

The 1.5 GeV compact light source UCS proposed for UCLA must fit into a shielded vault that is 9.144 meters (30 feet) wide. In order for the machine to fit into the allowable space, the ring circumference must be reduced 36 meters, the circumference of the six cell lattice, to something like 26 or 27 meters. The four cell lattice described in this report has a ring circumference of 27.0 meters.

Date: March 12, 1999

Creator: Garren, A.A. & Green, M.A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Superconducting solenoids for muon-cooling in the neutrino factory

The cooling channel for a neutrino factory consists of a series of alternating field solenoidal cells. The first section of the bunching cooling channel consists of 41 cells that are 2.75-m long. The second section of the cooling channel consists of 44 cells that are 1.65-m long. Each cell consists of a single large solenoid with an average diameter of 1.5 m and a pair of flux reversal solenoids that have an average diameter of 0.7 to 0.9 meters. The magnetic induction on axis reaches a peak va… more

Date: May 12, 2001

Creator: Green, M. A.; Miller, J. R. & Prestemon, S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Tests on large diameter superconducting solenoids designed for colliding beam accelerators

Two prototype large diameter thin coil solenoids which use the mechanical structure to moderate quenches, were built and systematically tested. The solenoids are cooled by two phase helium flowing in tubes which form a part of the coil structure. The coils were tested by inducing a series of quenches at various currents. The results of these tests are given.

Date: August 1, 1976

Creator: Eberhard, P. H.; Green, M. A.; Michael, W. B.; Taylor, J. D. & Wenzel, W. A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Bent solenoid simulations for the muon cooling experiment

The muon collider captures pions using solenoidal fields. The pion are converted to muons as they are bunched in an RF phase rotation system. Solenoids are used to focus the muons as their emitance is reduced during cooling. Bent solenoids are used to sort muons by momentum. This report describes a bent solenoid system that is part of a proposed muon cooling experiment. The superconducting solenoid described in this report consists of a straight solenoid that is 1.8 m long, a bent solenoid that… more

Date: July 9, 1999

Creator: Green, M. A.; Eyssa, Y. M.; Kenney, S.; Miller, J. R. & Prestemon, S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Quench Protection for the MICE Cooling Channel CouplingMagnet

The MICE coupling coil is fabricated from Nb-Ti, which hashigh quench propagation velocities within the coil in all directionscompared to coils fabricated with other superconductors such as niobiumtin. The time for the MICE coupling coil to become fully normal throughnormal region propagation in the coil is shorter than the time needed fora safe quench (as defined by a hot-spot temperature that is less than 300K). A MICE coupling coil quench was simulated using a code written at theInstitute of… more

Date: November 20, 2007

Creator: Green, M.A.; Wang, L. & Guo, X.L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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The ASTROMAG superconducting magnet facility configured for a free flying satellite

ASTROMAG is a particle astrophysics facility that was originally configured for the Space Station. The heart of the ASTROMAG facility is a large superconducting magnet which is cooled using superfluid helium. The task of resizing the facility so that it will fly in a satellite in a high angle of inclination orbit is driven by the launch weight capability of the launch rocket and the desire to be able to do nearly the same physics as the Space Station version of ASTROMAG. In order to reduce the … more

Date: June 1, 1991

Creator: Green, M. A. & Smoot, G. F.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Ferromagnetic material in the superconductor and its effect on the magnetization sextupole and decapole in the SSC dipoles at injection

It has been shown that the magnetization of a multifilamentary superconductor can be altered by adding nickel to the composite strand. This report presents the results of calculations of the magnetization sextupole and higher multipoles in a five centimeter SSC dipole with and without nickel as part of the strand composite. The relative distribution of the nickel in the inner and outer coil conductors can be used to effectively eliminate sextupole and decapole at the SSC dipole injection field.… more

Date: March 1, 1991

Creator: Green, M. A.; Collings, E. W.; Marken, K. R. & Sumption, M. D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Concentrator silicon cell research

This project continued the developments of high-efficiency silicon concentrator solar cells with the goal of achieving a cell efficiency in the 26 to 27 percent range at a concentration level of 150 suns of greater. The target efficiency was achieved with the new PERL (passivated emitter, rear locally diffused) cell structure, but only at low concentration levels around 20 suns. The PERL structure combines oxide passivation of both top and rear surfaces of the cells with small area contact to h… more

Date: April 1, 1992

Creator: Green, M. A.; Wenham, S. R.; Zhang, F.; Zhao, J. & Wang, A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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The UCLA Phi Factory detector, the integration of superconducting compensation solenoids and the final focus interaction region quadrupoles

The proposed Phi Factory for the University of California at Los Angeles (UCLA) is a small 510 MeV electron-positron colliding beam storage ring with high luminosity (greater than 10{sup 32} CM{sup {minus}2} S{sup {minus}1}). In order to do high quality Phi physics, a particle detector system with a large solid angle (preferably greater than 98 percent ) is required. Particle detection and analysis will be done within a 0.5 tesla solenoidal magnetic field. The solenoidal field within the detect… more

Date: June 1, 1992

Creator: Green, M. A. & Cline, D. B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Ground motion measurements at the LBL Light Source site, the Bevatron and at SLAC

This report describes the technique for measuring ground motion at the site of the 1.0 to 2.0 GeV Synchrotron Radiation Facility which was known as the Advanced Light Source (in 1983 when the measurements were taken). The results of ground motion measurements at the Light Source site at Building 6 at LBL are presented. As comparison, ground motion measurements were made at the Byerly Tunnel, the Bevatron, Blackberry Canyon, and SLAC at the Spear Ring. Ground Motion at the Light Source site was … more

Date: December 1, 1986

Creator: Green, M. A.; Majer, E. I.; More, V. D.; O'Connell, D. R. & Shilling, R. C.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Sampling and Analysis Plan for canister liquid and gas sampling at 105-KW fuel storage basin

This Sampling and Analysis Plan (SAP) details the sampling and analyses to be performed on fuel canisters transferred to the Weasel Pit of the 105-KW fuel storage basin. The radionuclide content of the liquid and gas in the canisters must be evaluated to support the shipment of fuel elements to the 300 Area in support of the fuel characterization studies (Abrefah, et al. 1994, Trimble 1995). The following sections provide background information and a description of the facility under investigat… more

Date: March 1, 1995

Creator: Harris, R. A.; Green, M. A.; Makenas, B. J. & Trimble, D. J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Measurement and theoretical calculation of quench velocities within large fully epoxy-impregnated superconducting coils

The velocity of normal region propagation was measured in a 2-m diameter superconducting coil. The measured data made with small sense coils, did not agree very well with theories which have been used for the last 15 years. An adiabatic quench propagation theory, which takes into account the properties of both the superconductor and the matrix material and which assumes there is no heat transfer out of the wire, was found to agree with the experimental measurements. Both the theory and experime… more

Date: March 1, 1981

Creator: Eberhard, P.H.; Gibson, G.H.; Green, M.A.; Grossman, E.; Ross, R.R. & Taylor, J.D.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Estimating the Cost of Superconducting Magnets and the Refrigerators Needed to Keep Them Cold

The cost of superconducting magnets and the refrigerators needed to keep them cold can be estimated if one knows the magnet stored energy and the amount of refrigeration needed. This report updates the cost data collected over 20 years ago by Strobridge and others. Early cost data has been inflated into 1991 dollars and data on newer superconducting magnets has been added to the old data. The cost of superconducting magnets has been correlated with stored energy and field-magnetic volume produc… more

Date: June 1, 1991

Creator: Green, M. A.; Byrns, R. & St. Lorant, S. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Superconducting solenoids for the Muon collider

The muon collider is a new idea for lepton colliders. The ultimate energy of an electron ring is limited by synchrotron radiation. Mouns, which have a rest mass that is 200 times that of an electron can be stored at much higher energies before synchrotron radiation limits ring performance. The problem with muon is their short lifetime (2.1 microseconds at rest). In order to operate a muon storage ring large numbers of muon must be collected, cooled and accelerated before they decay to an electr… more

Date: September 23, 1999

Creator: Green, M. A.; Eyssa, Y.; Kenny, S.; Miller, J. R.; Prestemon, S. & Weggel, R. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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The Cryogenic System for the ASTROMAG Test Coil

This paper describes an all helium, low heat leak cryogenic system for the testing of a superconducting magnet coil for the ASTROMAG particle astrophysics experiment. The superconducting coil, which is projected to have a stored magnetic energy of 4 to 7 MJ, will be cooled by pumped helium from a liquid helium storage tank using a fountain effect helium II pump. The pumping system can be used to cool the cryogenic system down as well as keep the coil cold during its superconducting operation. T… more

Date: July 1, 1988

Creator: Green, M. A.; Levine, S. M.; Smoot, G. F. & Witebsky, C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Bent Superconducting Solenoids for the Muon Cooling Experiment

This report describes some solenoid design work done for the cooling experiment for the muon collider collaboration. This report describes an analysis section of superconducting solenoids that have a center line induction of 3.0 T. The section is bent in the shape of an S. Each bend in the S bends the muon beam one radian (57.3 degrees). The warm bore diameter of the solenoid bent solenoid is 300 to 320 mm. The radius of the bend at the solenoid center line is 1000 mm. This report shows the res… more

Date: March 18, 1999

Creator: Green, M. A.; Eyssa, Y.; Kenney, S.; Miller, J. R.; Prestemon, S. & Wang, S. T.

Item Type: Article

Partner: UNT Libraries Government Documents Department