Plasma Science and Fusion Center Dataverse

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531 to 540 of 570 Results

Measurements of Ion Stopping Around the Bragg Peak in High-Energy-Density Plasmas Oct 18, 2018 J.A. Frenje, P.E. Grabowski, C.K. Li, F.H. Séguin, A.B. Zylstra, M. Gatu Johnson, R.D. Petrasso, V. Yu Glebov, and T.C. Sangster, 2018, "Measurements of Ion Stopping Around the Bragg Peak in High-Energy-Density Plasmas", https://doi.org/10.7910/DVN/WC7D1N, Harvard Dataverse, V1, UNF:6:FO8/rO8dSxd0U8CL4whzrQ== [fileUNF] For the first time, quantitative measurements of ion stopping at energies around the Bragg peak (or peak ion stopping, which occurs at an ion velocity comparable to the average thermal electron velocity), and its dependence on electron temperature and electron number density in the range of 0.5–4.0 keV and 3×10[sup 22] to 3×10[sup 23] cm[sup ?3] ha...
Impact of Helium Ion Energy Modulation on Tungsten Surface Morphology and Nano-Tendril Growth Oct 18, 2018 Kevin Woller, Dennis Whyte, Graham Wright, 2018, "Impact of Helium Ion Energy Modulation on Tungsten Surface Morphology and Nano-Tendril Growth", https://doi.org/10.7910/DVN/E7WWGM, Harvard Dataverse, V1, UNF:6:4OxDafFNq5iFGG7SlvmtRA== [fileUNF] Time-modulated helium (He) ion energy (e.g. V_Bias = -50 + 25sin(2pif_RFt), f_RF = 13.56 MHz) is demonstrated to strongly affect the development of tungsten (W) surface morphology that results from He plasma irradiation in the DIONISOS linear plasma experiment. Nano-tendril bundles (NTBs), which appear as isolated “islands” of nano-tendrils, ca...
Termination Methods for REBCO Tape High-Current Cable Conductors Oct 18, 2018 M. Takayasu, L. Chiesa, J.V. Minervini, 2018, "Termination Methods for REBCO Tape High-Current Cable Conductors", https://doi.org/10.7910/DVN/L2LTSC, Harvard Dataverse, V1, UNF:6:yQxOguHqSMzWfFckd5mBrA== [fileUNF] Three types of joint termination methods for a 2G HTS cable have been developed: YBCO-BSCCO, YBCO-YBCO, and Folding-fan soldered terminations. For the YBCO-BSCCO terminator, each YBCO tape of a cable is connected to a BSCCO tape while the other ends of BSCCO tapes are bundled together and soldered inside a copper tube. The same termination was test...
The magnetic recoil spectrometer (MRSt) for time-resolved measurements of the neutron spectrum at the National Ignition Facility (NIF) Oct 18, 2018 J. A. Frenje, T. J. Hilsabeck, C. W. Wink, P. Bell, R. Bionta, C. Cerjan, M. Gatu Johnson, J. D. Kilkenny, C. K. Li, F. H. Séguin and R. D. Petrasso, 2018, "The magnetic recoil spectrometer (MRSt) for time-resolved measurements of the neutron spectrum at the National Ignition Facility (NIF)", https://doi.org/10.7910/DVN/WC2OKM, Harvard Dataverse, V1, UNF:6:mLg2saU/2CUOqmk+pRNTDw== [fileUNF] The next-generation magnetic recoil spectrometer for time-resolved measurements of the neutron spectrum has been conceptually designed for the National Ignition Facility. This spectrometer, called MRSt, represents a paradigm shift in our thinking about neutron spectrometry for inertial confinement fusion applications, as it will provide simultaneou...
Surface heat flux feedback controlled impurity seeding experiments with Alcator C-Mod’s high-Z vertical target plate divertor: performance, limitations and implications for fusion power reactors Oct 16, 2018 D. Brunner, S.M. Wolfe, B. LaBombard, A.Q. Kuang, B. Lipschultz, M.L. Reinke, A. Hubbard, J. Hughes, R.T. Mumgaard, J.L. Terry, M.V. Umansky, the Alcator C-Mod Team, 2018, "Surface heat flux feedback controlled impurity seeding experiments with Alcator C-Mod’s high-Z vertical target plate divertor: performance, limitations and implications for fusion power reactors", https://doi.org/10.7910/DVN/YZJOCX, Harvard Dataverse, V1 The Alcator C-Mod team has recently developed a feedback system to measure and control surface heat flux in real-time. The system uses real-time measurements of surface heat flux from surface thermocouples and a pulse-width modulated piezo valve to inject low-Z impurities (typically N2) into the private flux region. It has been used in C-Mod to mit...
Linear servomotor probe drive system with real-time self-adaptive position control for the Alcator C-Mod tokamak Oct 16, 2018 D. Brunner, A.Q. Kuang, B. LaBombard, W. Burke, 2018, "Linear servomotor probe drive system with real-time self-adaptive position control for the Alcator C-Mod tokamak", https://doi.org/10.7910/DVN/I5SQMY, Harvard Dataverse, V1 A new servomotor drive system has been developed for the horizontal reciprocating probe on the Alcator C-Mod tokamak. Real-time measurements of plasma temperature and density—through use of a mirror Langmuir probe bias system—combined with a commercial linear servomotor and controller enables self-adaptive position control. Probe surface temperatur...
On the correlation between ‘non-local’ effects and intrinsic rotation reversals in Alcator C-Mod Oct 16, 2018 P. Rodriguez-Fernandez, J.E. Rice, N.M. Cao, A.J. Creely, N.T. Howard, A.E. Hubbard, J.H. Irby, A.E. White, 2018, "On the correlation between ‘non-local’ effects and intrinsic rotation reversals in Alcator C-Mod", https://doi.org/10.7910/DVN/QS4Z4Y, Harvard Dataverse, V1 Contemporary predictive models for heat and particle transport in tokamak plasmas are based on the assumption that local fluxes can be described in terms of local plasma parameters, where electromagnetic drift-wave-type turbulence is driven by local gradients and results in cross-field transport. The question of whether or not transport could be do...
Validation of nonlinear gyrokinetic simulations of L- and I-mode plasmas on Alcator C-Mod Oct 16, 2018 A. J. Creely, N. T. Howard, P. Rodriguez-Fernandez, N. Cao, A. E. Hubbard, J. W. Hughes, J. E. Rice, A. E. White, J. Candy, G. M. Staebler, G. D. Conway, S. J. Freethy, C. Sung, 2018, "Validation of nonlinear gyrokinetic simulations of L- and I-mode plasmas on Alcator C-Mod", https://doi.org/10.7910/DVN/XTUKGA, Harvard Dataverse, V1 New validation of global, nonlinear, ion-scale gyrokinetic simulations (GYRO) is carried out for L- and I-mode plasmas on Alcator C-Mod, utilizing heat fluxes, profile stiffness, and temperature fluctuations. Previous work at C-Mod found that ITG/TEM-scale GYRO simulations can match both electron and ion heat fluxes within error bars in I-mode [Whi...
Development of an inertial confinement fusion platform to study charged particle-producing nuclear reactions relevant to nuclear astrophysics Oct 16, 2018 M. Gatu Johnson, A.B. Zylstra, A. Bacher, C.R. Brune, D.T. Casey, C. Forrest, H.W. Herrmann, M. Hohenberger, D.B. Sayre, R.M. Bionta, J.-L. Bourgade, J.A. Caggiano, C. Cerjan, R.S. Craxton, D. Dearborn, M. Farrell, J.A. Frenje, E.M. Garcia, V.Yu. Glebov, G. Hale, E.P. Hartouni, R. Hatarik, M. Hohensee, D.M. Holunga, M. Hoppe, R. Janezic, S.F. Khan, J.D. Kilkenny, Y.H. Kim, J.P. Knauer, T.R. Kohut, B. Lahmann, O. Landoas, C.K. Li, F.J. Marshall, L. Masse, A. McEvoy, P. McKenty, D.P. McNabb, A. Nikroo, T.G. Parham, M. Paris, R.D. Petrasso, J. Pino, P.B. Radha, B. Remington, H.G. Rinderknecht, H. Robey, M.J. Rosenberg, B. Rosse, M. Rubery, T.C. Sangster, J. Sanchez, M. Schmitt, M. Schoff, F.H. Séguin, W. Seka, H. Sio, C. Stoeckl, B. Tipton, 2018, "Development of an inertial confinement fusion platform to study charged particle-producing nuclear reactions relevant to nuclear astrophysics", https://doi.org/10.7910/DVN/IB6UKW, Harvard Dataverse, V1, UNF:6:cZZBp9B17//6+6zT/VjtKw== [fileUNF] This paper describes the development of a platform to study astrophysically relevant nuclear reactions using inertial-confinement fusion implosions on the OMEGA and NIF laser facilities, with a particular focus on optimizing the implosions to study charged-particle-producing reactions. Primary requirements on the platform are high yield, for high s...
HIS-TORIC: Extending core ICRF wave simulation to include realistic SOL plasmas Oct 16, 2018 S. Shiraiwa, J, C. Wright, J. P. Lee, P. Bonoli, 2018, "HIS-TORIC: Extending core ICRF wave simulation to include realistic SOL plasmas", https://doi.org/10.7910/DVN/2GEFJW, Harvard Dataverse, V1 This paper presents a novel approach to incorporating an arbitrarily shaped edge scrape-off-layer (SOL) plasma and an ion cyclotron range of frequency (ICRF) antenna structure into existing core ICRF wave simulation models. We partition the entire computation domain into two sub-domains: a core and an edge region. Simulations in each domain are per...

Measurements of Ion Stopping Around the Bragg Peak in High-Energy-Density Plasmas

Oct 18, 2018

J.A. Frenje, P.E. Grabowski, C.K. Li, F.H. Séguin, A.B. Zylstra, M. Gatu Johnson, R.D. Petrasso, V. Yu Glebov, and T.C. Sangster, 2018, "Measurements of Ion Stopping Around the Bragg Peak in High-Energy-Density Plasmas", https://doi.org/10.7910/DVN/WC7D1N, Harvard Dataverse, V1, UNF:6:FO8/rO8dSxd0U8CL4whzrQ== [fileUNF]

For the first time, quantitative measurements of ion stopping at energies around the Bragg peak (or peak ion stopping, which occurs at an ion velocity comparable to the average thermal electron velocity), and its dependence on electron temperature and electron number density in the range of 0.5–4.0 keV and 3×10[sup 22] to 3×10[sup 23] cm[sup ?3] ha...

Impact of Helium Ion Energy Modulation on Tungsten Surface Morphology and Nano-Tendril Growth

Oct 18, 2018

Kevin Woller, Dennis Whyte, Graham Wright, 2018, "Impact of Helium Ion Energy Modulation on Tungsten Surface Morphology and Nano-Tendril Growth", https://doi.org/10.7910/DVN/E7WWGM, Harvard Dataverse, V1, UNF:6:4OxDafFNq5iFGG7SlvmtRA== [fileUNF]

Time-modulated helium (He) ion energy (e.g. V_Bias = -50 + 25*sin(2*pi*f_RF*t), f_RF = 13.56 MHz) is demonstrated to strongly affect the development of tungsten (W) surface morphology that results from He plasma irradiation in the DIONISOS linear plasma experiment. Nano-tendril bundles (NTBs), which appear as isolated “islands” of nano-tendrils, ca...

Termination Methods for REBCO Tape High-Current Cable Conductors

Oct 18, 2018

M. Takayasu, L. Chiesa, J.V. Minervini, 2018, "Termination Methods for REBCO Tape High-Current Cable Conductors", https://doi.org/10.7910/DVN/L2LTSC, Harvard Dataverse, V1, UNF:6:yQxOguHqSMzWfFckd5mBrA== [fileUNF]

Three types of joint termination methods for a 2G HTS cable have been developed: YBCO-BSCCO, YBCO-YBCO, and Folding-fan soldered terminations. For the YBCO-BSCCO terminator, each YBCO tape of a cable is connected to a BSCCO tape while the other ends of BSCCO tapes are bundled together and soldered inside a copper tube. The same termination was test...

The magnetic recoil spectrometer (MRSt) for time-resolved measurements of the neutron spectrum at the National Ignition Facility (NIF)

Oct 18, 2018

J. A. Frenje, T. J. Hilsabeck, C. W. Wink, P. Bell, R. Bionta, C. Cerjan, M. Gatu Johnson, J. D. Kilkenny, C. K. Li, F. H. Séguin and R. D. Petrasso, 2018, "The magnetic recoil spectrometer (MRSt) for time-resolved measurements of the neutron spectrum at the National Ignition Facility (NIF)", https://doi.org/10.7910/DVN/WC2OKM, Harvard Dataverse, V1, UNF:6:mLg2saU/2CUOqmk+pRNTDw== [fileUNF]

The next-generation magnetic recoil spectrometer for time-resolved measurements of the neutron spectrum has been conceptually designed for the National Ignition Facility. This spectrometer, called MRSt, represents a paradigm shift in our thinking about neutron spectrometry for inertial confinement fusion applications, as it will provide simultaneou...

Surface heat flux feedback controlled impurity seeding experiments with Alcator C-Mod’s high-Z vertical target plate divertor: performance, limitations and implications for fusion power reactors

Oct 16, 2018

D. Brunner, S.M. Wolfe, B. LaBombard, A.Q. Kuang, B. Lipschultz, M.L. Reinke, A. Hubbard, J. Hughes, R.T. Mumgaard, J.L. Terry, M.V. Umansky, the Alcator C-Mod Team, 2018, "Surface heat flux feedback controlled impurity seeding experiments with Alcator C-Mod’s high-Z vertical target plate divertor: performance, limitations and implications for fusion power reactors", https://doi.org/10.7910/DVN/YZJOCX, Harvard Dataverse, V1

The Alcator C-Mod team has recently developed a feedback system to measure and control surface heat flux in real-time. The system uses real-time measurements of surface heat flux from surface thermocouples and a pulse-width modulated piezo valve to inject low-Z impurities (typically N2) into the private flux region. It has been used in C-Mod to mit...

Linear servomotor probe drive system with real-time self-adaptive position control for the Alcator C-Mod tokamak

Oct 16, 2018

D. Brunner, A.Q. Kuang, B. LaBombard, W. Burke, 2018, "Linear servomotor probe drive system with real-time self-adaptive position control for the Alcator C-Mod tokamak", https://doi.org/10.7910/DVN/I5SQMY, Harvard Dataverse, V1

A new servomotor drive system has been developed for the horizontal reciprocating probe on the Alcator C-Mod tokamak. Real-time measurements of plasma temperature and density—through use of a mirror Langmuir probe bias system—combined with a commercial linear servomotor and controller enables self-adaptive position control. Probe surface temperatur...

On the correlation between ‘non-local’ effects and intrinsic rotation reversals in Alcator C-Mod

Oct 16, 2018

P. Rodriguez-Fernandez, J.E. Rice, N.M. Cao, A.J. Creely, N.T. Howard, A.E. Hubbard, J.H. Irby, A.E. White, 2018, "On the correlation between ‘non-local’ effects and intrinsic rotation reversals in Alcator C-Mod", https://doi.org/10.7910/DVN/QS4Z4Y, Harvard Dataverse, V1

Contemporary predictive models for heat and particle transport in tokamak plasmas are based on the assumption that local fluxes can be described in terms of local plasma parameters, where electromagnetic drift-wave-type turbulence is driven by local gradients and results in cross-field transport. The question of whether or not transport could be do...

Validation of nonlinear gyrokinetic simulations of L- and I-mode plasmas on Alcator C-Mod

Oct 16, 2018

A. J. Creely, N. T. Howard, P. Rodriguez-Fernandez, N. Cao, A. E. Hubbard, J. W. Hughes, J. E. Rice, A. E. White, J. Candy, G. M. Staebler, G. D. Conway, S. J. Freethy, C. Sung, 2018, "Validation of nonlinear gyrokinetic simulations of L- and I-mode plasmas on Alcator C-Mod", https://doi.org/10.7910/DVN/XTUKGA, Harvard Dataverse, V1

New validation of global, nonlinear, ion-scale gyrokinetic simulations (GYRO) is carried out for L- and I-mode plasmas on Alcator C-Mod, utilizing heat fluxes, profile stiffness, and temperature fluctuations. Previous work at C-Mod found that ITG/TEM-scale GYRO simulations can match both electron and ion heat fluxes within error bars in I-mode [Whi...

Development of an inertial confinement fusion platform to study charged particle-producing nuclear reactions relevant to nuclear astrophysics

Oct 16, 2018

M. Gatu Johnson, A.B. Zylstra, A. Bacher, C.R. Brune, D.T. Casey, C. Forrest, H.W. Herrmann, M. Hohenberger, D.B. Sayre, R.M. Bionta, J.-L. Bourgade, J.A. Caggiano, C. Cerjan, R.S. Craxton, D. Dearborn, M. Farrell, J.A. Frenje, E.M. Garcia, V.Yu. Glebov, G. Hale, E.P. Hartouni, R. Hatarik, M. Hohensee, D.M. Holunga, M. Hoppe, R. Janezic, S.F. Khan, J.D. Kilkenny, Y.H. Kim, J.P. Knauer, T.R. Kohut, B. Lahmann, O. Landoas, C.K. Li, F.J. Marshall, L. Masse, A. McEvoy, P. McKenty, D.P. McNabb, A. Nikroo, T.G. Parham, M. Paris, R.D. Petrasso, J. Pino, P.B. Radha, B. Remington, H.G. Rinderknecht, H. Robey, M.J. Rosenberg, B. Rosse, M. Rubery, T.C. Sangster, J. Sanchez, M. Schmitt, M. Schoff, F.H. Séguin, W. Seka, H. Sio, C. Stoeckl, B. Tipton, 2018, "Development of an inertial confinement fusion platform to study charged particle-producing nuclear reactions relevant to nuclear astrophysics", https://doi.org/10.7910/DVN/IB6UKW, Harvard Dataverse, V1, UNF:6:cZZBp9B17//6+6zT/VjtKw== [fileUNF]

This paper describes the development of a platform to study astrophysically relevant nuclear reactions using inertial-confinement fusion implosions on the OMEGA and NIF laser facilities, with a particular focus on optimizing the implosions to study charged-particle-producing reactions. Primary requirements on the platform are high yield, for high s...

HIS-TORIC: Extending core ICRF wave simulation to include realistic SOL plasmas

Oct 16, 2018

S. Shiraiwa, J, C. Wright, J. P. Lee, P. Bonoli, 2018, "HIS-TORIC: Extending core ICRF wave simulation to include realistic SOL plasmas", https://doi.org/10.7910/DVN/2GEFJW, Harvard Dataverse, V1

This paper presents a novel approach to incorporating an arbitrarily shaped edge scrape-off-layer (SOL) plasma and an ion cyclotron range of frequency (ICRF) antenna structure into existing core ICRF wave simulation models. We partition the entire computation domain into two sub-domains: a core and an edge region. Simulations in each domain are per...

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