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Armor plate protection for the Doublet III vacuum vessel for neutral beam heating

Description: The design of vacuum vessel armor plate for neutral beam systems presents a number of challenges to the engineer. Heat fluxes of several hundred watts/cm/sup 2/ must be handled on a routine basis during normal plasma operations, and a factor of ten increase in these fluxes can occur during plasma disruptions. At the present time, a graphite tile system appears to be the best candidate for such a situation. Heat fluxes in excess of 4 kW/cm/sup 2/ can be routinely sustained and the material sputt… more
Date: October 1, 1979
Creator: Colleraine, A.P.; Kamperschroer, J.H. & Pipkins, J.F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Optical pyrometry applied to the neutral beam interlock system for Doublet III

Description: The neutral beam injection system for Doublet III has been designed with curved grid ion sources and near-perpendicular injection. Given these conditions the neutral beam power loading on the inside wall of the vacuum chamber can be as high as 5 kW/cm/sup 2/ if no plasma is present. To protect the tokamak against the neutral beam under conditions where the plasma density is diminished, a fast infrared detector system is being developed. This device will monitor the beam hot spot on the armor pl… more
Date: October 1, 1979
Creator: McMahon, T.R.; Kamperschroer, J.H. & Colleraine, A.P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Three-dimensional heat transfer analysis of the Doublet III beamline calorimeter

Description: A general three-dimensional analysis has been formulated to study the flow of heat in a neutral beam calorimeter. The boundary value problem with an arbitrary incident heat flux has been solved using Fourier analysis and Laplace transform techniques. A general solution has been obtained and subsequently studied using numerical techniques as applied to the particular geometry and incident heat flux conditions of the Doublet III injection system. Negligible errors result in unfolding the incident… more
Date: October 1979
Creator: Kamperschroer, J. H. & Pipkins, J. F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Doublet III neutral beam injector test tank cryopanel design

Description: A simple condensing cryopanel has been designed for the Doublet III neutral beam test tank with a 320,000 liters per second pumping capacity for hydrogen. This maintains a vacuum in the test tank which simulates the Doublet III vessel, 1.3 x 10/sup -3/ Pa (approx.10/sup -5/ torr). The hydrogen gas load comes from the beam striking the test tank calorimeter and amounts to about 7.2 torr liters per second. The cryopanel is cylindrical shaped with a liquid helium (LHe) surface that pumps through l… more
Date: March 1, 1980
Creator: Doll, D.W.; Kamperschroer, J.H. & Arend, P.V.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Doublet III neutral beam test tank design

Description: A tank has been designed for testing the Doublet III Neutral Beam Injector which simulates the entrance and pressure conditions of the Doublet III vacuum vessel. The cylindrical shape vacuum vessel is the same size as the neutral beam injector vessel. Contained inside are a cylindrical cryopanel, a V-shaped calorimeter, and a retractable sample-holding device to be used for beam armor proof testing. The cryopanel has 4.2 m of surface for pumping the hydrogen load created by beam impingement on … more
Date: March 1, 1980
Creator: Doll, D.W.; Kamperschroer, J.H. & Bailey, E.W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Multiple track Doppler-shift spectroscopy system for TFTR neutral beam injectors

Description: A Doppler-shift spectroscopy system has been installed on the TFTR neutral beam injection system to measure species composition during both conditioning and injection pulses. Two intensified vidicon detectors and two spectrometers are utilized in a system capable of resolving data from up to twelve ion sources simultaneously. By imaging the light from six ion sources onto one detector, a cost-effective system has been achieved. Fiber optics are used to locate the diagnostic in an area remote fr… more
Date: September 1, 1986
Creator: Kamperschroer, J. H.; Kugel, H. W.; Reale, M. A.; Hayes, S. L.; Johnson, G. A.; Lowrance, J. L. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Gas utilization in TFTR (Tokamak Fusion Test Reactor) neutral beam injectors

Description: Measurements of gas utilization in a test TFTR neutral beam injector have been performed to study the feasibility of running tritium neutral beams with existing ion sources. Gas consumption is limited by the restriction of 50,000 curies of T/sub 2/ allowed on site. It was found that the gas efficiency of the present long-pulse ion sources is higher than it was with previous short-pulse sources. Gas efficiencies were studied over the range of 35 to 55%. At the high end of this range the neutral … more
Date: August 1, 1987
Creator: Kamperschroer, J. H.; Gammel, G. M.; Kugel, H. W.; Grisham, L. R.; Stevenson, T. N.; von Halle, A. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Measurements of neutral beam species, impurities, spatial divergence, energy dispersion, pressure, and reionization for the TFTR (Tokamak Fusion Test Reactor) US Common Long Pulse Ion Source

Description: Physical characteristics of TFTR neutral beams were measured during the first tests and initial operating experience with production TFTR US Common Long Pulse Ion Sources on beamlines in the TFTR experimental environment under actual user conditions. These measurements were performed with different power supply systems, controls, diagnostics, and operating methods compared to those used at LBL during the development phase. The set of diagnostics included water calorimetry, thermocouples, vacuum… more
Date: June 1, 1988
Creator: Kugel, H. W.; Gammel, G. M.; Grisham, L. R.; Kaita, R.; Kamperschroer, J. H.; Langley, R. A. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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TFTR (Tokamak Fusion Test Reactor) neutral beam injected power measurement

Description: Energy flow within TFTR neutral beamlines is measured with a waterfall calorimetry system capable of simultaneously measuring the energy deposited within four heating beamlines (three ion sources each), or of measuring the energy deposited in a separate neutral beam test stand. Of the energy extracted from the ion source in the well instrumented test stand, 99.5 +- 3.5% can be accounted for. When the ion deflection magnet is energized, however, 6.5% of the extracted energy is lost. This loss is… more
Date: May 1, 1989
Creator: Kamperschroer, J. H.; Grisham, L. R.; Dudek, L. E.; Gammel, G. M.; Johnson, G. A.; Kugel, H. W. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Temporal behavior of neutral particle fluxes in TFTR (Tokamak Fusion Test Reactor) neutral beam injectors

Description: Data from an E {parallel} B charge exchange neutral analyzer (CENA), which views down the axis of a neutral beamline through an aperture in the target chamber calorimeter of the TFTR neutral beam test facility, exhibit two curious effects. First, there is a turn-on transient lasting tens of milliseconds having a magnitude up to three times that of the steady-state level. Second, there is a 720 Hz, up to 20% peak-to-peak fluctuation persisting the entire pulse duration. The turn-on transient occ… more
Date: September 1, 1989
Creator: Kamperschroer, J. H.; Gammel, G. M.; Roquemore, A. L.; Grisham, L. R.; Kugel, H. W.; Medley, S. S. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Cryosorption of helium on argon frost TFTR (Tokamak Fusion Test Reactor) neutral beamlines

Description: Helium pumping on argon frost has been investigated on TFTR neutral beam injectors and shown to be viable for limited helium beam operation. Maximum pumping speeds are {approximately} 25% less than those measured for pumping of deuterium. Helium pumping efficiency is low, > 20 argon atoms are required to pump each helium atom. Adsorption isotherms are exponential and exhibit a two-fold increase in adsorption capacity as the cryopanel temperature is reduced from 4.3 K to 3.7 K. Pumping speed was… more
Date: November 1, 1989
Creator: Kamperschroer, J. H.; Cropper, M. B.; Dylla, H. F.; Garzotto, V.; Dudek, L. E.; Grisham, L. R. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Near-field characterization of hydrogen and helium operation on the TFTR (Tokamak Fusion Test Reactor) diagnostic neutral beam

Description: An Optical Multichannel Analyzer has been used to measure beam divergence and composition. This measurement is usually performed near the center of the neutralizer or beyond the magnet. In the past, these locations suffered difficult beam composition analysis and low light intensity, respectively. It has been determined that the light emission is relatively independent of neutralizer line density in the near field, allowing near-field measurements to overcome both difficulties. At optimum perve… more
Date: July 1, 1990
Creator: Kamperschroer, J. H.; Schilling, G. & Roquemore, A. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Operation of a TFTR ion source with a ground potential gas feed into the neutralizer

Description: TFTR long pulse ion sources have been operated with gas fed only into the neutralizer. Gas for the plasma generator entered through the accelerator rather than directly into the arc chamber. This modification has been proposed for tritium beam operation to locate control electronics at ground potential and to simplify tritium plumbing. Source operation with this configuration and with the nominal gas system which feeds gas into both the ion source and the center of the neutralizer are compared.… more
Date: July 1, 1991
Creator: Kamperschroer, J. H.; Dudek, L. E.; Grisham, L. R.; Newman, R. A.; O'Conner, T. E.; Stevenson, T. N. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Operation of TFTR neutral beams with heavy ions

Description: High Z neutral atoms have been injected into TFTR plasmas in an attempt to enhance plasma confinement through modification of the edge electric field. TFTR ion sources have extracted 9 A of 62 keV Ne{sup +} for up to 0.2 s during injection into deuterium plasmas, and for 0.5 s during conditioning pulses. Approximately 400 kW of Ne{sup 0} have been injected from each of two ion sources. Operation was at full bending magnet current, with the Ne{sup +} barely contained on the ion dump. Beamline de… more
Date: July 1, 1991
Creator: Kamperschroer, J. H.; Stevenson, T. N.; Wright, K. E.; Dudek, L. E.; Grisham, L. R.; Newman, R. A. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Measurement of ion profiles in TFTR neutral beamlines

Description: A technique is described whereby the ion dumps inside the TFTR Neutral Beam Test Stand were used to measure thermal profiles of the full-, half-, and third-energy ions. 136 thermocouples were installed on the full-energy ion dump, allowing full beam contours. Additional linear arrays across the widths of the half- and third-energy ion dumps provided a measure of the shape, in the direction parallel to the grid rails, of the half- and third-energy ions, and, hence, of the molecular ions extracte… more
Date: February 1, 1992
Creator: Kamperschroer, J. H.; Grisham, L. R.; Kugel, H. W.; O'Connor, T. E.; Stevenson, T. N.; von Halle, A. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Measurement of ion profiles in TFTR neutral beamlines

Description: A technique is described whereby the ion dumps inside the TFTR Neutral Beam Test Stand were used to measure thermal profiles of the full-, half-, and third-energy ions. 136 thermocouples were installed on the full-energy ion dump, allowing full beam contours. Additional linear arrays across the widths of the half- and third-energy ion dumps provided a measure of the shape, in the direction parallel to the grid rails, of the half- and third-energy ions, and, hence, of the molecular ions extracte… more
Date: February 1, 1992
Creator: Kamperschroer, J. H.; Grisham, L. R.; Kugel, H. W.; O`Connor, T. E.; Stevenson, T. N.; von Halle, A. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Particle reflection and TFTR neutral beam diagnostics

Description: Determination of two critical neutral beam parameters, power and divergence, are affected by the reflection of a fraction of the incident energy from the surface of the measuring calorimeter. On the TFTR Neutral Beam Test Stand, greater than 30% of the incident power directed at the target chamber calorimeter was unaccounted for. Most of this loss is believed due to reflection from the surface of the flat calorimeter, which was struck at a near grazing incidence (12{degrees}). Beamline calorime… more
Date: April 1, 1992
Creator: Kamperschroer, J. H.; Grisham, L. R.; Kugel, H. W.; O'Connor, T. E.; Newman, R. A.; Stevenson, T. N. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Particle reflection and TFTR neutral beam diagnostics

Description: Determination of two critical neutral beam parameters, power and divergence, are affected by the reflection of a fraction of the incident energy from the surface of the measuring calorimeter. On the TFTR Neutral Beam Test Stand, greater than 30% of the incident power directed at the target chamber calorimeter was unaccounted for. Most of this loss is believed due to reflection from the surface of the flat calorimeter, which was struck at a near grazing incidence (12{degrees}). Beamline calorime… more
Date: April 1, 1992
Creator: Kamperschroer, J. H.; Grisham, L. R.; Kugel, H. W.; O`Connor, T. E.; Newman, R. A.; Stevenson, T. N. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Low Z impurity ion extraction from TFTR ion sources

Description: TFTR deuterium neutral beams have been operated unintentionally with significant quantities of extracted water ions. Water has been observed with an Optical Multichannel Analyzer (OMA) during beam extraction when small water leaks were present within the arc chamber. These leaks were thermally induced with the contamination level increasing linearly with pulse length. 6% of the beam current was attributed to water ions for the worst leak, corresponding to an instantaneous value of 12% at the en… more
Date: April 1, 1993
Creator: Kamperschroer, J. H.; Grisham, L. R.; Newman, R. A.; O'Connor, T. E.; Stevenson, T. N.; von Halle, A. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Low Z impurity ion extraction from TFTR ion sources

Description: TFTR deuterium neutral beams have been operated unintentionally with significant quantities of extracted water ions. Water has been observed with an Optical Multichannel Analyzer (OMA) during beam extraction when small water leaks were present within the arc chamber. These leaks were thermally induced with the contamination level increasing linearly with pulse length. 6% of the beam current was attributed to water ions for the worst leak, corresponding to an instantaneous value of 12% at the en… more
Date: April 1, 1993
Creator: Kamperschroer, J. H.; Grisham, L. R.; Newman, R. A.; O`Connor, T. E.; Stevenson, T. N.; von Halle, A. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Conceptual design of the neutral beamline for TPX long pulse operation

Description: The Tokamak Physics Experiment (TPX) will require a minimum of 8.0 megawatts of Neutral Beam beating power to be injected into the plasma for pulse lengths up to one thousand (1000) seconds to meet the experimental objectives. The Neutral Beam Injection System (NBIS) for initial operation on TPX will consist of one neutral beamline (NBL) with three Ion sources. Provisions will be made for a total of three NBLs. The NBIS will provide S.S MW of 120 keV D{sup 0} and 2.S MW of partial-energy D{sup … more
Date: November 1, 1993
Creator: Wright, K. E.; Dahlgren, F.; Fan, H. M.; Grisham, L. R.; Hammersand, F. G.; Kamperschroer, J. H. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Doppler-shifted neutral beam line shape and beam transmission

Description: Analysis of Doppler-shifted Balmer-{alpha} line emission from the TFTR neutral beam injection systems has revealed that the line shape is well approximated by the sum of two Gaussians, or, alternatively, by a Lorentzian. For the sum of two Gaussians, the broad portion of the distribution contains 40% of the beam power and has a divergence five times that of the narrow part. Assuming a narrow 1/e- divergence of 1.3{degrees} (based on fits to the beam shape on the calorimeter), the broad part has… more
Date: April 1, 1994
Creator: Kamperschroer, J. H.; Grisham, L. R.; Kokatnur, N.; Lagin, L. J.; Newman, R. A.; O`Connor, T. E. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Observation of Doppler-shifted T{alpha} emission from TFTR tritium neutral beams

Description: 195 tritium ion source shots were injected into TFTR high power plasmas during December 1993--March 1994. In addition, four highly diagnosed pulses were fired into the calorimeter. Analysis of the Doppler-shifted T{alpha} emission of the beam in the neutralizer has revealed that the extracted ion composition for deuterium and tritium are indistinguishable: 0.72{plus_minus}0.04 D{sup +}, 0.22{plus_minus}0.02 D{sub 2}{sup +}, 0.07{plus_minus}0.01 D{sub 3}{sup +} compared to 0.72{plus_minus}0.04 T… more
Date: June 1, 1994
Creator: Kamperschroer, J. H.; Grisham, L. R.; Lagin, L. J.; O`Connor, T. E.; Newman, R. A.; Stevenson, T. N. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Experience with deuterium-tritium plasmas heated by high power neutral beams

Description: The Tokamak Fusion Test Reactor has operated since November of 1993 with a deuterium-tritium fuel mixture for selected discharges. The majority of the tritium has been introduced as energetic neutral atoms of up to 120 keV injected by the neutral beam systems, with some of the twelve ion sources run on pure tritium and some on deuterium to optimize the fuel mixture in the core plasma. A maximum beam power of 39.6 megawatts has been injected, and deuterium-tritium fusion power production has rea… more
Date: 1996
Creator: Grisham, L. R.; Kamperschroer, J. H.; O`Connor, T.; Oldaker, M.; Stevenson, T. & Von Halle, A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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