Note: Proc. 17th IAEA Fusion Energy Conference, Yokohama, Japan, Octobre 1998, IAEA-CN-69, THP2/2... more Note: Proc. 17th IAEA Fusion Energy Conference, Yokohama, Japan, Octobre 1998, IAEA-CN-69, THP2/23 (1999) Reference CRPP-CONF-1999-038 Record created on 2008-05-13, modified on 2017-05-12
Note: Proc. 18th IAEA Fusion Energy Conference, Sorrento, Italy, 4-10 October 2000, IAEA-CN-77 (T... more Note: Proc. 18th IAEA Fusion Energy Conference, Sorrento, Italy, 4-10 October 2000, IAEA-CN-77 (THP2/19), p. 421 (2000) Reference CRPP-CONF-2000-037 Record created on 2008-05-13, modified on 2017-05-12
Note: Proc. Int. Sherwood Fusion Theory Conference, Philadelphia, PA, USA, March 1996, 2C17 (1996... more Note: Proc. Int. Sherwood Fusion Theory Conference, Philadelphia, PA, USA, March 1996, 2C17 (1996) Reference CRPP-CONF-1996-024 Record created on 2008-05-13, modified on 2017-05-12
Keywords: LRP 647 Reference CRPP-REPORT-1999-016 Record created on 2008-04-18, modified on 2017-0... more Keywords: LRP 647 Reference CRPP-REPORT-1999-016 Record created on 2008-04-18, modified on 2017-05-12
Keywords: LRP 492 Reference CRPP-REPORT-1994-008 Record created on 2008-04-18, modified on 2017-0... more Keywords: LRP 492 Reference CRPP-REPORT-1994-008 Record created on 2008-04-18, modified on 2017-05-12
Note: Societe Suisse de Physique, Automne 1992 Reference CRPP-CONF-1992-020 Record created on 200... more Note: Societe Suisse de Physique, Automne 1992 Reference CRPP-CONF-1992-020 Record created on 2008-05-13, modified on 2017-05-12
Note: Proc. Joint Varenna-Lausanne Int. Workshop on Theory of Fusion Plasmas, Varenna, Italy, Aug... more Note: Proc. Joint Varenna-Lausanne Int. Workshop on Theory of Fusion Plasmas, Varenna, Italy, August 1994, ISPP-15, 369 - 378 (1994) Reference CRPP-CONF-1994-023View record in Web of Science Record created on 2008-05-13, modified on 2017-05-12
Previously we have reported on the ray trajectories which arise in linear resonant plasma-wave co... more Previously we have reported on the ray trajectories which arise in linear resonant plasma-wave conversion (mode conversion) in tokamak geometry, and have described the implementation of an algorithm to treat the associated ray splitting that occurs with conversion [1]. We have shown how an incident ray gives rise to transmitted, converted, and reflected rays, noting the important effect of the
Global Alfvén eigenmodes are studied using two different models for the plasma and the results co... more Global Alfvén eigenmodes are studied using two different models for the plasma and the results compared with the instability threshold measured experimentally. Fluid-resistive models predict that continuum damped toroidicity induced Alfvén modes (TAE) are formed in the frequency range of the experimental instabilities, but using realistic values of the resistivity makes a stability analysis impossible for computational reasons. The kinetic plasma model solves this problem by taking into account the ion Larmor radius and the resonant Landau interactions between the particles and the wavefield. As a consequence drift-kinetic Alfvén eigenmodes (DKAE) are created by toroidal coupling between the global TAE wavefield, the mode converted kinetic Alfvén, ion-acoustic and drift waves. The power transfers between the wave and the particles show that the drift character of the wavefield in the core destabilizes DKAE modes through resonant interactions with the fast beam ions. The predicted be...
The problem of resonant mode conversion in multiple spatial dimensions is considered. Using phase... more The problem of resonant mode conversion in multiple spatial dimensions is considered. Using phase space methods, a complete theory is developed for constructing matched asymptotic expansions that fit incoming and outgoing WKB solutions. These results provide, for the first time, a complete and practical method for including multidimensional conversion in ray tracing algorithms. The paper provides a self-contained description of the following topics: (1) how to use eikonal (also known as ray tracing or WKB) methods to solve vector wave equations and how to detect conversion regions while following rays; (2) once conversion is detected, how to fit to a generic saddle structure in ray phase space associated with the most common type of conversion; (3) given the saddle structure, how to carry out a local projection of the full vector wave equation onto a local two-component normal form that governs the two resonantly interacting waves. This determines both the uncoupled dispersion funct...
The damping of radially extended Alfven eigenmodes in tokamak plasmas is investigated in JET disc... more The damping of radially extended Alfven eigenmodes in tokamak plasmas is investigated in JET discharges with different ion mass. The comparison of damping measurements with predictions of a gyro-kinetic model indicates that mode conversion into kinetic Alfven waves is the dominant damping mechanism for Alfven eigenmodes in the plasma core.
The damping rate of the n = 1 toroidal Alfven eigenmodes (TAE) mode in Ohmic-heated JET plasmas h... more The damping rate of the n = 1 toroidal Alfven eigenmodes (TAE) mode in Ohmic-heated JET plasmas has been measured and compared with the prediction of the kinetic NOVA-K code, which includes electron and ion Landau damping of the global shear-Alfven wave field, collisional damping, and radiative damping. It was found that the calculated damping rate is too small to account for the measured value under these experimental conditions. A relatively weak dependence of the damping rate on the normalized Larmor radius is observed experimentally.
The combination of clinical knowledge (applicable for a majority of patients, published in the fo... more The combination of clinical knowledge (applicable for a majority of patients, published in the form of review articles), real world evidence (describing more nuanced outcomes for small cohorts) and innovative artificial intelligence algorithms opens potent avenues to re-examine clinical findings and uncover new biomarkers for the prognosis / prediction of therapeutic responses--in a manner that can directly be incorporated in clinical decision support tools. In this work, neural networks are first developed to reproduce clinical guidelines with >95% accuracy. After mastering the complex knowledge that is generally expected from human doctors, a transfer learning technique was used to sift through de-identified longitudinal data of 9267 patients with multiple myeloma-related conditions at the Vanderbilt University Medical Center using progression free survival (PFS) to quantify therapeutic outcomes. The "precision medicine neural networks" obtained as a result can be com...
Keywords: LRP 508 Reference CRPP-REPORT-1994-018 Record created on 2008-04-18, modified on 2017-0... more Keywords: LRP 508 Reference CRPP-REPORT-1994-018 Record created on 2008-04-18, modified on 2017-05-12
Note: Proc. Int. Sherwood Fusion Theory Conference, Incline Village, N.V. USA, April 1995, 1C5 (1... more Note: Proc. Int. Sherwood Fusion Theory Conference, Incline Village, N.V. USA, April 1995, 1C5 (1995) Reference CRPP-CONF-1995-031 Record created on 2008-05-13, modified on 2017-05-12
Note: Proc. 17th IAEA Fusion Energy Conference, Yokohama, Japan, Octobre 1998, IAEA-CN-69, THP2/2... more Note: Proc. 17th IAEA Fusion Energy Conference, Yokohama, Japan, Octobre 1998, IAEA-CN-69, THP2/23 (1999) Reference CRPP-CONF-1999-038 Record created on 2008-05-13, modified on 2017-05-12
Note: Proc. 18th IAEA Fusion Energy Conference, Sorrento, Italy, 4-10 October 2000, IAEA-CN-77 (T... more Note: Proc. 18th IAEA Fusion Energy Conference, Sorrento, Italy, 4-10 October 2000, IAEA-CN-77 (THP2/19), p. 421 (2000) Reference CRPP-CONF-2000-037 Record created on 2008-05-13, modified on 2017-05-12
Note: Proc. Int. Sherwood Fusion Theory Conference, Philadelphia, PA, USA, March 1996, 2C17 (1996... more Note: Proc. Int. Sherwood Fusion Theory Conference, Philadelphia, PA, USA, March 1996, 2C17 (1996) Reference CRPP-CONF-1996-024 Record created on 2008-05-13, modified on 2017-05-12
Keywords: LRP 647 Reference CRPP-REPORT-1999-016 Record created on 2008-04-18, modified on 2017-0... more Keywords: LRP 647 Reference CRPP-REPORT-1999-016 Record created on 2008-04-18, modified on 2017-05-12
Keywords: LRP 492 Reference CRPP-REPORT-1994-008 Record created on 2008-04-18, modified on 2017-0... more Keywords: LRP 492 Reference CRPP-REPORT-1994-008 Record created on 2008-04-18, modified on 2017-05-12
Note: Societe Suisse de Physique, Automne 1992 Reference CRPP-CONF-1992-020 Record created on 200... more Note: Societe Suisse de Physique, Automne 1992 Reference CRPP-CONF-1992-020 Record created on 2008-05-13, modified on 2017-05-12
Note: Proc. Joint Varenna-Lausanne Int. Workshop on Theory of Fusion Plasmas, Varenna, Italy, Aug... more Note: Proc. Joint Varenna-Lausanne Int. Workshop on Theory of Fusion Plasmas, Varenna, Italy, August 1994, ISPP-15, 369 - 378 (1994) Reference CRPP-CONF-1994-023View record in Web of Science Record created on 2008-05-13, modified on 2017-05-12
Previously we have reported on the ray trajectories which arise in linear resonant plasma-wave co... more Previously we have reported on the ray trajectories which arise in linear resonant plasma-wave conversion (mode conversion) in tokamak geometry, and have described the implementation of an algorithm to treat the associated ray splitting that occurs with conversion [1]. We have shown how an incident ray gives rise to transmitted, converted, and reflected rays, noting the important effect of the
Global Alfvén eigenmodes are studied using two different models for the plasma and the results co... more Global Alfvén eigenmodes are studied using two different models for the plasma and the results compared with the instability threshold measured experimentally. Fluid-resistive models predict that continuum damped toroidicity induced Alfvén modes (TAE) are formed in the frequency range of the experimental instabilities, but using realistic values of the resistivity makes a stability analysis impossible for computational reasons. The kinetic plasma model solves this problem by taking into account the ion Larmor radius and the resonant Landau interactions between the particles and the wavefield. As a consequence drift-kinetic Alfvén eigenmodes (DKAE) are created by toroidal coupling between the global TAE wavefield, the mode converted kinetic Alfvén, ion-acoustic and drift waves. The power transfers between the wave and the particles show that the drift character of the wavefield in the core destabilizes DKAE modes through resonant interactions with the fast beam ions. The predicted be...
The problem of resonant mode conversion in multiple spatial dimensions is considered. Using phase... more The problem of resonant mode conversion in multiple spatial dimensions is considered. Using phase space methods, a complete theory is developed for constructing matched asymptotic expansions that fit incoming and outgoing WKB solutions. These results provide, for the first time, a complete and practical method for including multidimensional conversion in ray tracing algorithms. The paper provides a self-contained description of the following topics: (1) how to use eikonal (also known as ray tracing or WKB) methods to solve vector wave equations and how to detect conversion regions while following rays; (2) once conversion is detected, how to fit to a generic saddle structure in ray phase space associated with the most common type of conversion; (3) given the saddle structure, how to carry out a local projection of the full vector wave equation onto a local two-component normal form that governs the two resonantly interacting waves. This determines both the uncoupled dispersion funct...
The damping of radially extended Alfven eigenmodes in tokamak plasmas is investigated in JET disc... more The damping of radially extended Alfven eigenmodes in tokamak plasmas is investigated in JET discharges with different ion mass. The comparison of damping measurements with predictions of a gyro-kinetic model indicates that mode conversion into kinetic Alfven waves is the dominant damping mechanism for Alfven eigenmodes in the plasma core.
The damping rate of the n = 1 toroidal Alfven eigenmodes (TAE) mode in Ohmic-heated JET plasmas h... more The damping rate of the n = 1 toroidal Alfven eigenmodes (TAE) mode in Ohmic-heated JET plasmas has been measured and compared with the prediction of the kinetic NOVA-K code, which includes electron and ion Landau damping of the global shear-Alfven wave field, collisional damping, and radiative damping. It was found that the calculated damping rate is too small to account for the measured value under these experimental conditions. A relatively weak dependence of the damping rate on the normalized Larmor radius is observed experimentally.
The combination of clinical knowledge (applicable for a majority of patients, published in the fo... more The combination of clinical knowledge (applicable for a majority of patients, published in the form of review articles), real world evidence (describing more nuanced outcomes for small cohorts) and innovative artificial intelligence algorithms opens potent avenues to re-examine clinical findings and uncover new biomarkers for the prognosis / prediction of therapeutic responses--in a manner that can directly be incorporated in clinical decision support tools. In this work, neural networks are first developed to reproduce clinical guidelines with >95% accuracy. After mastering the complex knowledge that is generally expected from human doctors, a transfer learning technique was used to sift through de-identified longitudinal data of 9267 patients with multiple myeloma-related conditions at the Vanderbilt University Medical Center using progression free survival (PFS) to quantify therapeutic outcomes. The "precision medicine neural networks" obtained as a result can be com...
Keywords: LRP 508 Reference CRPP-REPORT-1994-018 Record created on 2008-04-18, modified on 2017-0... more Keywords: LRP 508 Reference CRPP-REPORT-1994-018 Record created on 2008-04-18, modified on 2017-05-12
Note: Proc. Int. Sherwood Fusion Theory Conference, Incline Village, N.V. USA, April 1995, 1C5 (1... more Note: Proc. Int. Sherwood Fusion Theory Conference, Incline Village, N.V. USA, April 1995, 1C5 (1995) Reference CRPP-CONF-1995-031 Record created on 2008-05-13, modified on 2017-05-12
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