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Quench protection for a 2-MJ magnet

Description: A superconducting solenoid with conductive bore tube has been used at energies up to 1.9-MJ to test various methods of quench protection. The methods all involve shifting the main coil current to the conductive bore tube and include (1) allowing the quench to evolve naturally, (2) interrupting the primary circuit while providing a varistor used as a shunt across the coil, and (3) turning the entire magnet normal by dumping a short pulse of current from a capacitor bank through the windings.
Date: September 1, 1978
Creator: Taylor, J. A.; Alston-Garnjost, M.; Eberhard, P. E.; Gibson, G. H.; Green, M. A.; Pardoe, B. et al.
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Partner: UNT Libraries Government Documents Department
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ASTROMAG: A superconducting particle astrophysics magnet facility for the space station

Description: This paper describes a superconducting magnet system which is the heart of a particle astrophysics facility to be mounted on a portion of the proposed NASA space station. This facility will complete the studies done by the electromagnetic observatories now under development and construction by NASA. The paper outlines the selection process of the type of magnet to be used to analyze the energy and momentum of charged particles from deep space. The ASTROMAG superconducting magnet must meet all t… more
Date: September 1, 1986
Creator: Green, M. A.; Smoot, G. F.; Golden, R. L.; Israel, M. H.; Kephart, R.; Niemann, R. et al.
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Partner: UNT Libraries Government Documents Department
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Correction of the field in the SSC dipoles using superconductor on the wedges

Description: The SSC colliding beam storage ring requires superconducting magnets capable of producing a magnetic field of 6.6 T which has very high accuracy. For many of the multipoles, that multipole must be reduced (at a radius of 1 centimeter) to the order of 0.2 parts in 10,000. This field accuracy is dictated by the physics of storing very small high-current proton beams at energies ranging from 1 TeV to 20 TeV. Magnetization of the superconductor can cause sextupole field errors of up to 6 parts in 1… more
Date: September 1, 1987
Creator: Green, M. A. & Talman, R. M.
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Partner: UNT Libraries Government Documents Department
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Measurements of passive correction of magnetization higher multipoles in one meter long dipoles

Description: The use of passive superconductor to correct the magnetization sextupole and decapole in SSC dipoles appears to be promising. This paper presents the results of a series of experiments of passive superconductor correctors in one meter long dipole magnets. Reduction of the magnetization sextupole by a factor of five to ten has been achieved using the passive superconductor correctors. The magnetization decapole was also reduced. The passive superconductor correctors reduced the sextupole tempera… more
Date: September 1, 1990
Creator: Green, M. A.; Althaus, R. F.; Barale, P. J.; Benjegerdes, R. W.; Gilbert, W. S.; Green, M. I. et al.
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Partner: UNT Libraries Government Documents Department
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New measurements of magnetic field decay in 1 meter SSC-type dipoles

Description: Previous studies of magnetic field decay in model SSC dipoles due to changes in magnetization currents caused by flux creep have used the assumed SSC injection energy of 1 TeV, or 0.33 tesla central dipole field, and an excitation to the storage field of 6.6 tesla. More recently, it has been decided to inject at 2 TeV, or 0.66 tesla and so more recent tests have been carried out at the new injection field, or at both the new and old fields. Additionally, the effect of temperature changes and ex… more
Date: September 1, 1990
Creator: Gilbert, W. S.; Althaus, R. F.; Barale, P. J.; Benjegerdes, R. W.; Green, M. A.; Green, M. I. et al.
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Partner: UNT Libraries Government Documents Department
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Calculation of the pressure rise in the cooling tube of a two-phase cooling system during a quench of an indirectly cooled superconducting magnet

Description: Large superconducting detector magnets are indirectly cooled with two-phase helium flowing in cooling tubes attached to the coil or its support structure. Large detector magnets often quench such that most of the magnet stored energy ends up as heat stored in the coil package. The time constant for energy deposition in the coil and support structure is often quite short. This paper presents a method for calculating the peak pressure rise in the magnet tow-phase cooling tube during a magnet quen… more
Date: September 1, 1993
Creator: Green, M. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The g-2 Storage Ring Superconducting Magnet System

Description: The g-2 {mu} lepton (muon) storage ring is a single dipole magnet that is 44 meters in circumference. The storage ring dipole field is created by three large superconducting solenoid coils. A single outer solenoid, 15.1 meters in diameter, carries 254 kA. Two inner solenoids, 13.4 meters in diameter, carry 127 kA each in opposition to the current carried by the outer solenoid. A room temperature C shaped iron yoke returns the magnetic flux and shapes the magnetic field in a 180 mm gap where the… more
Date: September 1, 1993
Creator: Green, M. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The design and construction of a gradient solenoid for the high powered RF cavity experiment for the muon collider

Description: This report describes the construction and test of a split solenoid that has a warm bore of 440 mm and a cryostat length of 1088 mm. (A 750 mm section contains the magnetic field.) When the coils are hooked so the fields are additive, the central induction is 5.0 T at its design current. When the coils are hooked so that the fields are in opposition, the induction at the center of the solenoid is zero and the peak induction on the solenoid axis is {+-}3.7 T. The on-axis induction gradient is 25… more
Date: September 5, 1999
Creator: Green, M. A.; Chen, J. Y. & Wang, S. T.
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Partner: UNT Libraries Government Documents Department
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High field solenoids for muon cooling

Description: 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.
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Partner: UNT Libraries Government Documents Department
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Superconducting solenoids for the Muon collider

Description: 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.
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Partner: UNT Libraries Government Documents Department
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ALS superbend magnet system

Description: The Lawrence Berkeley National Laboratory is preparing to upgrade the Advanced Light Source (ALS) with three superconducting dipoles (Superbends). In this paper we present the final magnet system design which incorporates R&D test results and addresses the ALS operational concerns of alignment, availability, and economy. The design incorporates conduction-cooled Nb-Ti windings and HTS current leads, epoxy-glass suspension straps, and a Gifford-McMahon cryocooler to supply steady state refri… more
Date: September 15, 2000
Creator: Zbasnik, J.; Wang, S. T.; Chen, J. Y.; DeVries, G. J.; DeMarco, R.; Fahmie, M. et al.
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Partner: UNT Libraries Government Documents Department
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The use of a permanent magnet for water content measurements ofwood chips

Description: The Lawrence Berkeley National Laboratory has developed a device that measures the water content of wood chips, pulp and brown stock for the paper industry. This device employs a permanent magnet as the central part of a NMR measurement system. This report describes the magnet and the NMR measurement system. The results of water content measurements in wood chips in a magnetic field of 0.47 T are presented.
Date: September 20, 2001
Creator: Barale, P. J.; Fong, C. G.; Green, M. A.; Luft, P. A.; McInturff, A. D.; Reimer, J. A. et al.
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Partner: UNT Libraries Government Documents Department
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Design issues for cryogenic cooling of short periodsuperconducting undulators

Description: Superconducting insertion devices, which produce periodic magnetic fields, have been built and installed in a number of synchrotron-light source storage-rings. For the most part, these devices have been wigglers, which have relatively long period lengths. This report concerns itself with the special cryogenic issues associated with short period undulators. The motivation for considering the incorporation of superconducting technology in insertion device designs is to achieve higher magnetic fie… more
Date: September 15, 2003
Creator: Green, M. A.; Dietderich, D. R.; Marks, S.; Prestemon, S. O. & Schlueter, R. D.
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Partner: UNT Libraries Government Documents Department
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Focusing solenoids for the MICE cooling channel

Description: This report describes a design for focusing solenoids for the low beta sections for the proposed Muon Ionization Cooling Experiment (MICE). There are three focusing solenoid pairs that will be around the muon absorbers for MICE. The two solenoid coils have an inside diameter of 510 mm, a length of 180 mm, and a thickness of 100 mm. A distance of 260 mm separates the two coils in the pair. The coils are designed to operate at opposite polarity, in order to create a gradient field in the low beta… more
Date: September 15, 2003
Creator: Green, M.A.; Baynham, E.; Barr, G.; Lau, W.; Rochford, J.H. & Yang, S.
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Partner: UNT Libraries Government Documents Department
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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

Description: 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.
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Partner: UNT Libraries Government Documents Department
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The Mechanical and Thermal Design for the MICE Coupling SolenoidMagnet

Description: The MICE coupling solenoids surround the RF cavities that are used to increase the longitudinal momentum of the muon beam that is being cooled within MICE. The coupling solenoids will have a warm-bore diameter of 1394 mm. This is the warm bore that is around the 200 MHz RF cavities. The coupling solenoid is a single superconducting coil fabricated from a copper matrix Nb-Ti conductor originally designed for MRI magnets. A single coupling magnet is designed so that it can be cooled with a single… more
Date: September 20, 2004
Creator: Green, M.A.; Yang, S.Q.; Bravar, U.; Lau, W.; Li, D.; Strauss,B.P. et al.
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Partner: UNT Libraries Government Documents Department
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The Mechanical and Thermal Design for the MICE Detector Solenoid Magnet System

Description: The detector solenoid for MICE surrounds a scintillating fiber tracker that is used to analyze the muon beam within the detector. There are two detector magnets for measuring the beam emittance entering and leaving the cooling channel that forms the central part of the experiment. The field in the region of the fiber detectors must be from 2.8 to 4 T and uniform to better than 1 percent over a volume that is 300 mm in diameter by 1000 mm long. The portion of the detector magnet that is around t… more
Date: September 26, 2004
Creator: Fabbricatore, P.; Farinon, S.; Perrella, M.; Bravar, U. & Green, M. A.
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Partner: UNT Libraries Government Documents Department
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