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Plasma Science and Fusion Center

Massachusetts Institute of Technology


Fredrick SÉguin

Research Scientist

frederick H. Seguin

MIT Plasma Science & Fusion Center


Phone: (617) 253-0836

Address: Room NW17-254

Related links: High-Energy-Density Physics Division



Biographical Sketch

Following graduate and post-doctoral work in theoretical astrophysics and a brief involvement with x-ray astronomy, Fredrick Seguin has worked in plasma physics and diagnostics for magnetic fusion energy (MFE), inertial-confinement fusion (ICF), and high-energy-density physics (HEDP). Mixed in have been technologically and mathematically related projects resulting in new x-ray imaging and analysis approaches for industrial, biomedical, archaeological and art-historical applications.

In ICF he developed the compact Wedge-Range-Filter proton spectrometers now used as a standard diagnostic, applying them in the first experimental measurements demonstrating that nominally-symmetric ICF implosions usually have asymmetric density distributions. He also developed proton-emission imaging for studying the 3-D spatial distributions of nuclear burn in D3 He plasmas, and used it to study relationships of asymmetries in laser drive and capsule structure to ICF implosion symmetry and performance. In another imaging application, he has worked closely with C.K. Li and R.D. Petrasso on monoenergetic proton radiography for studying laser-plasma interactions (in which new instabilities, magnetic reconnection, and Rayleigh-Taylor instabilities have been observed and quantified).

In MFE, he developed specialized x-ray detection hardware for imaging of magnetically-confined plasmas, including radiation-hardened detectors for burning plasma tokamaks such as ITER. He made the first tomographic reconstructions of 2-D x-ray emission distributions in the MIT Alcator -A tokamak, in 1978, studying the growth of coupled mode structures preceeding major disruptions, and he developed a theoretical eigenfunction formalism for modeling radial impurity transport in tokamaks, incorporating the effects of internal disruptions and comparing with Alcator-C impurity-injection data.

Fredrick also has extensive experience in computed tomography (CT), working with American Science and Engineering, Inc., the International Atomic Energy Agency (IAEA), the Woods Hole Oceanographic Institution, the Conservation-Analytical Laboratory of the Smithsonian Institution, and Lockheed Martin. He was sent by the IAEA to teach, design laboratories, and provide advice for the Malaysian government. He was a principle designer of the first successful very large and very small industrial x-ray CT systems for inspection of solid-propellant rocket motors, small laboratory animals, human breast biopsy samples, industrial objects such as 3-D carbon-carbon composites, oil core samples, and archaeological ceramics. He was also an early proponent of using digital imaging and image processing for evaluating art-historical objects.


  Postdoc Center for Astrophysics, Harvard University and Smithsonian Institution , 1974-1976
  Ph.D. Physics California Institute of Technology, 1974
(Thesis: "The Structure and Stability of Relativistic, Differentially Rotating Stars")
  S.B. Physics Massachusetts Institute of Technology, 1969
(Thesis: "Lepton Symmetry Groups")

Selected Bibliography

Inertially Confined Plasmas and High-Energy-Density Physics

“Using target shimming to achieve burn symmetry with asymmetric drive in ICF implosions” , F. H. Séguin , C. K. Li, J. A. Frenje , J. R. Rygg , R. D. Petrasso , V. A. Smalyuk, S. Craxton, J. P. Knauer, F. J. Marshall, T. C. Sangster, S. Skupsk , A. Greenwood, J. Kilkenny, to be submitted.

"Proton Radiography of Inertial Fusion Implosions", J. R. Rygg, F. H. Séguin, C. K. Li, J. A. Frenje, M. J.-E. Manuel, R. D. Petrasso, R. Betti, J. A. Delettrez, O. V. Gotchev, J. P. Knauer, D. D. Meyerhofer, F. J. Marshall, C. Stoeckl, W. Theobald, Science 319, 1223 (2008).

"Observation of Megagauss-Field Topology Changes due to Magnetic Reconnection in Laser-Produced Plasmas" , C. K. Li, F. H. Séguin, J. A. Frenje, J. R. Rygg, R. D. Petrasso, R. P. J. Town, O. L. Landen, J. P. Knauer and V. A. Smalyuk, Phys. Rev. Lett . 99, 055001 (2007).

"Measured dependence of nuclear burn region size on implosion parameters in inertial confinement fusion experiments ", F. H. Séguin, J. L. DeCiantis, J. A. Frenje, C. K. Li, J. R. Rygg , C. D. Chen, R. D. Petrasso , J. A. Delettrez , S. P. Regan, V. A. Smalyuk , V. Yu. Glebov, J. P. Knauer, F. J. Marshall, D. D. Meyerhofer, S. Roberts, T. C. Sangster, C. Stoeckl, K. Mikaelian, H. S. Park, H. F. Robey, R. E. Tipton, Phys. Plasmas 13 , 082704 (2006).

“D3He-proton emission imaging for inertial-confinement-fusion experiments (invited) ” , F. H. Séguin, J. L. DeCiantis, J. A. Frenje, S. Kurebayashi, C. K. Li, J. R. Rygg, C. Chen, V. Berube, B. E. Schwartz, R. D. Petrasso, V. A. Smalyuk, F. J. Marshall, J. P. Knauer, J. A. Delettrez, P. W. McKenty, D. D. Meyerhofer, S. Roberts, T. C. Sangster, K. Mikaelian and H. S. Park, Rev. Sci. Instrum. 75, 3520 (2004).

“Spectrometry of charged particles from inertial-confinement-fusion plasmas ”, F. H. Séguin, J. A. Frenje, C. K. Li, D. G. Hicks, S. Kurebayashi, J. R. Rygg, B.-E. Schwartz, R. D. Petrasso, S. Roberts, J. M. Soures, D. D. Meyerhofer, T. C. Sangster, J. P. Knauer, C. Sorce, V. Yu. Glebov, C. Stoeckl, T. W. Phillips, R. J. Leeper, K. Fletcher, S. Padalino, Rev. Sci . Instrum . 74, 975 (2003).

“Measurements of roh R asymmetries at burn time in inertial-confinement-fusion capsules ”, F. H. Séguin, C. K. Li, J. A. Frenje, S. Kurebayashi, R. D. Petrasso, F. J. Marshall, D. D. Meyerhofe , J. M. Soures, T. C. Sangster, C. Stoeckl, J. A. Delettrez, P. B. Radha, V. A. Smalyuk, S. Roberts, Phys. Plasmas 9, 3558 (2002).

“Using secondary-proton spectra to study the compression and symmetry of deuterium-filled capsules at OMEGA ” , F. H. Séguin, C. K. Li, J. A. Frenje, D. G. Hicks, K. M. Green, S. Kurebayash , R. D. Petrasso, J. M. Soures, D. D. Meyerhofer, V. Yu. Glebov, P. B. Radha, C. Stoeckl, S. Roberts, C. Sorc , T. C. Sangster, M. D. Cable, K. Fletcher, S. Padalino, Phys. Plasmas 9, 2725 (2002).

“Nuclear diagnostics for the National Ignition Facility ” , T. J. Murphy, C. W. Barnes, R. R. Berggren, P. Braddley , S. E. Caldwell, R. E. Chrien , J. R. Faulkner, P. L. Gobby , N. Hoffman, J. L. Jimerson , K.A. Klare , C. L. Lee, J. M. Mack, G. L. Morgan, J. A. Oertel , F. J. Swenson, P. J. Walsh, R. B. Walton, R. G Watt, M. D. Wilke , D. C. Wilson, C. S. Young, S. W. Haan , R. A. Lerche , M. J. Moran, T. W. Phillips, T. C. Sangster , R. J. Leeper , C. L. Ruiz, G. W. Cooper, L. Disdier , A. Rouyer , A. Fedotoff , V. Yu. Glebov , D. D. Meyhofer, J. M. Soures, C. Stoeckl, J. A. Frenje , C. K. Li, R. D. Petrasso, F. H. Ségui , K. Fletcher, S. Padalino , R. K. Fisher, Rev. Sci .Instrum . 72, 773 (2001).

Magnetically Confined Plasmas

“Radiation-hardened x-ray imaging for burning-plasma tokamaks ”, F. H. Séguin, R. D. Petrasso, and C. K. Li, Rev. Sci . Instrum . 68, 753-756 (1997).

"Effects of Internal Disruptions on Impurity Transport in Tokamaks " , F. H. Séguin, R. Petrasso, and E.S. Marmar, Phys. Rev. Lett . 51(6), 455-458 (1983).

"Fully Ionized and Total Silicon Abundances in the Alcator Tokamak ", R. Petrasso, F. H. Séguin, N.G. Loter, E. Marmar, and J. Rice, Phys. Rev. Lett . , vol. 49(25), p. 1826 (1982).

"Impurity Injection Experiments on the Alcator -C Tokamak ", E.S. Marmar, J.E. Rice, J. Terry, and F. H. Séguin, Nuclear Fusion, vol. 22(12), p. 1567 (1982).

"Energy and Impurity Transport in the Alcator -C Tokamak " , B. Blackwell, C. L. Fiore, R. Gandy, A. Gondhalekar , R. S. Granetz , M. Greenwald, D. Gwinn, E. S. E. Kallne , J. Kallne , S. Kissel , B. Lipshultz , N. G. Loter , E.S. Marmar , S. McCool, D. Overskei , D. S. Pappas, R. R. Parker, R. Petrasso , M. Pickrell , P. A. Politzer , M. Porkolab , P. Pribyl , J. E. Rice, F. H. Séguin , J. J. Schuss, J. L. Terry, R. Watterson , S. M. Wolfe, Proceedings of the 9th International Conference on Plasma Physics and Controlled Nuclear Fusion , Baltimore, IAEA-CN-41/I-3 (1982).

"Magnetic Island Structure in the Alcator -A Tokamak " , F. H. Séguin, R. Chase, R. Petrasso, and M. Gerassimenko, Bull. Am. Phys. Soc. 24(8), p. 998 (1979) and AS&E preprint 4528 (March 1980), available from the author.

Industrial and Biomedical X-ray Imaging

"Optimization of Parameters for High-Resolution Computed Tomography", F. H. Séguin an d P. J. Bjorkholm, in Review of Progress in Quantitative Nondestructive Evaluation, Vol. 8A , edited by C.O. Thompson and D.E. Chimenti (Plenum Press, New York, 1989), p. 373.

"Imaging Techniques in Bioassays", F. Homburger , P. Burstein, F. H. Séguin , P .J. Bjorkholm , in Safety Evaluation and Regulation of Chemicals , vol. 3, edited by F.Homburger (Karger , Basel, 1986), p. 98.

"X-Ray Computed Tomography with 50-Micron Resolution", F. H. Séguin, P. Burstein, P.J. Bjorkholm, F. Homburger, R.A. Adams, Applied Optics 24, 4117-4123 (1985).

"X-Ray Micro-CT Scanner for Biomedical Applications" , F. H. Séguin, P .J. Bjorkholm , P. Burstein, M. Annis , F. Homburger , R.A. Adams, in Medical Imaging and Instrumentation '85, SPIE Vol. 555 , edited by J.A. Mulvaney (International Society for Optical Engineering, Washington, 1985), p. 207.

"Vers le Perfectionnement d'un Bio-Essai de la Carcinogénèse par une Technique de Micro 'Cat Scanning'" ("Toward Improving Carcinogenesis Bioassay Through Micro CAT-Scanning Technique") , F. H. Séguin, P. Burstein , P. Bjorkholm , R.A. Adams and F. Homburger , published in Hommage au René Truhaut , Jubilé Scientifique de Professeur René Truhaut (Imprimerie Tardy Quercy [S.A.], 46001 Cahors, France, 1985), p. 1023.

"Flying-Spot Digital Radiography" , P. J. Bjorkholm, M. Annis, F. H. Séguin, i n Recent Developments in Digital Imaging, edited by K. Doi , L. Lanzl , and P.-J.P. Lin (American Institute of Physics, New York, 1985), p. 198.

"High-Resolution Tomography of Small Laboratory Animals" , F. H. Séguin, P. Burstein, P.J. Bjorkholm, F. Homburger, R.A. Adams, Technical Digest of the Topical Meeting on Industrial Applications of Computed Tomography and NMR Imaging , (Optical Society of America, 1984), p. MC-5.

"The Largest and Smallest X-Ray Computed Tomography Systems", P. Burstein, P. J. Bjorkholm, R. C. Chase, F. H. Séguin, Nuclear Instruments and Methods 221, p. 207 (1984).

Physical Analysis of Archaeology and Art History Materials

"Optimized Data Analysis for AMS Radiocarbon Dating ", F. H. Séguin, R.J. Schneider, G.A. Jones, and K.F. von Reden, Nuclear Instruments and Methods in Physics Research B, vol. 92, p. 176, 1994.

"High-Resolution Computed Tomography and Digital Radiography of Archaeological and Art-Historical Objects ", F. H. Séguin, in Materials Issues in Art and Archaeology II , edited by P.B. Vandiver, J. R. Druzik and G. Wheeler (Materials Reasearch Society, Pittsburgh, 1991), p. 65.

"New Applications of X-Radiographic Imaging Technologies for Archaeological Ceramics", P. Vandiver , W.A. Ellingson, T.K. Robinson, J.J. Lobick , and F. H. Séguin, Archeomaterials , vol. 5(2), p.185 (1991).


"Study of the Post-Flare Loops on 29 July 1973", R.D. Petrasso , J.T. Nolte, M. Gerassimenko, A.S. Krieger, R. Krogstad , and F. H. Séguin , Solar Physics , vol. 62, p. 133 (1979).

"Turbulence in Tidally Distorted Stars", F. H. Séguin, Astrophysical Journal , vol. 207, p. 848 (1976).

"The Stability of Non-uniform Rotation in Relativistic Stars", F. H. Séguin, Astrophysical Journal 197, 745-765 (1975).

"A Post-Newtonian Study of Differentially Rotating Stars", F. H. Séguin, Astrophysical Journal 179, p.289 (1973).





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