Reiner Stenzel

Last updated

Reiner Stenzel
Born
Reiner Ludwig Stenzel

Germany
DiedDecember 9, 2023(2023-12-09) (aged 83–84)
San Francisco, California
Education Technical University of Braunschweig (Dipl. Ing.)
California Institute of Technology (Ph.D.)
Scientific career
Fields Plasma physics
Institutions UCLA
Thesis Microwave absorption and emission from magnetized afterglow plasmas  (1970)
Doctoral advisor Roy W. Gould

Reiner Ludwig Stenzel was an American plasma physicist and professor emeritus at the University of California, Los Angeles (UCLA). [1] [2] [3] He was known for his experimental work in basic plasma physics, such as on whistler waves [4] [5] [6] and magnetic reconnection, [7] [8] and had contributed to the development of various plasma probes and antennas, [9] [10] [11] which included the microwave resonator (hairpin) probe. [12] He was a fellow of the American Physical Society. [13]

Contents

Early life and career

Stenzel completed his undergraduate education and received a Diplom-Ingenieur (Dipl.-Ing.) from the Technische Hochschule Braunschweig in 1965. He then obtained a Ph.D. from the California Institute of Technology in 1970. [1] His doctoral advisor was Roy W. Gould, and for his dissertation, he worked on measuring the radiation and absorption of electromagnetic energy in a magnetized plasma column.

Upon graduation, Stenzel continued working at Caltech as a postdoc. He also held research and teaching positions at UCLA in conjunction with TRW Inc. until 1976. In 1977, Stenzel joined UCLA physics department as an associate professor, and has been there ever since until his retirement in 2011. [3]

Stenzel held visiting professorship appointments at the University of Tokyo in 1980, University of Paris in 1995, and the University of Innsbruck in 2007. [3]

Honors and awards

In 1993, Stenzel was inducted as a fellow of the American Physical Society for "pioneering studies and major advances in nonlinear energy conversion processes in plasmas, including unprecedented detailed measurements of RF and whistler wave interactions, magnetic field reconnection and current disruptions". [13]

Personal life

Stenzel was married to Hatsuko Arima, and had three children, Andreas Ryuta, Anabel and Isabel. His two daughters were both diagnosed with cystic fibrosis [14] [15] and were the subjects of the documentary The Power of Two. [16]

Stenzel was also an avid climber and served as Vice Chair of the Sierra Peaks Section from 2004 to 2006. [17] [18]

Related Research Articles

Plasma diagnostics are a pool of methods, instruments, and experimental techniques used to measure properties of a plasma, such as plasma components' density, distribution function over energy (temperature), their spatial profiles and dynamics, which enable to derive plasma parameters.

<span class="mw-page-title-main">Magnetic reconnection</span> Process in plasma physics

Magnetic reconnection is a physical process occurring in electrically conducting plasmas, in which the magnetic topology is rearranged and magnetic energy is converted to kinetic energy, thermal energy, and particle acceleration. Magnetic reconnection involves plasma flows at a substantial fraction of the Alfvén wave speed, which is the fundamental speed for mechanical information flow in a magnetized plasma.

<span class="mw-page-title-main">Field-reversed configuration</span> Magnetic confinement fusion reactor

A field-reversed configuration (FRC) is a type of plasma device studied as a means of producing nuclear fusion. It confines a plasma on closed magnetic field lines without a central penetration. In an FRC, the plasma has the form of a self-stable torus, similar to a smoke ring.

<span class="mw-page-title-main">Large Plasma Device</span>

The Large Plasma Device is an experimental physics device located at UCLA. It is designed as a general purpose laboratory for experimental plasma physics research. The device began operation in 1991 and was upgraded in 2001 to its current version. The modern LAPD is operated as the primary device for a national collaborative research facility, the Basic Plasma Science Facility, which is supported by the US Department of Energy, Fusion Energy Sciences and the National Science Foundation. Half of the operation time of the device is available to scientists at other institutions and facilities who can compete for time through a yearly solicitation.

<span class="mw-page-title-main">Liu Chen (physicist)</span> American physicist

Liu Chen is an American theoretical physicist who has made original contributions to many aspects of plasma physics. He is known for the discoveries of kinetic Alfven waves, toroidal Alfven eigenmodes, and energetic particle modes; the theories of geomagnetic pulsations, Alfven wave heating, and fishbone oscillations, and the first formulation of nonlinear gyrokinetic equations. Chen retired from University of California, Irvine (UCI) in 2012, assuming the title professor emeritus of physics and astronomy.

John Bryan Taylor is a British physicist known for his contributions to plasma physics and their application in the field of fusion energy. Notable among these is the development of the "Taylor state", describing a minimum-energy configuration that conserves magnetic helicity. Another development was his work on the ballooning transformation, which describes the motion of plasma in toroidal (donut) configurations, which are used in the fusion field. Taylor has also made contributions to the theory of the Earth's Dynamo, including the Taylor constraint.

<span class="mw-page-title-main">Princeton field-reversed configuration</span>

The Princeton field-reversed configuration (PFRC) is a series of experiments in plasma physics, an experimental program to evaluate a configuration for a fusion power reactor, at the Princeton Plasma Physics Laboratory (PPPL). The experiment probes the dynamics of long-pulse, collisionless, low s-parameter field-reversed configurations (FRCs) formed with odd-parity rotating magnetic fields. FRCs are the evolution of the Greek engineer's Nicholas C. Christofilos original idea of E-layers which he developed for the Astron fusion reactor. The PFRC program aims to experimentally verify the physics predictions that such configurations are globally stable and have transport levels comparable with classical magnetic diffusion. It also aims to apply this technology to the Direct Fusion Drive concept for spacecraft propulsion.

Bernstein–Greene–Kruskal modes are nonlinear electrostatic waves that propagate in a collisionless plasma. They are nonlinear solutions to the Vlasov-Poisson system of equations in plasma physics, and are named after physicists Ira B. Bernstein, John M. Greene, and Martin D. Kruskal, who solved and published the exact solution for the one-dimensional unmagnetized case in 1957.

The Star Thrust Experiment (STX) was a plasma physics experiment at the University of Washington's Redmond Plasma Physics Laboratory which ran from 1999 to 2001. The experiment studied magnetic plasma confinement to support controlled nuclear fusion experiments. Specifically, STX pioneered the possibility of forming a Field-reversed configuration (FRC) by using a Rotating Magnetic Field (RMF).

Guy Laval is a French physicist, professor at the École polytechnique and member of the French Academy of Sciences.

Walter N. Gekelman is an experimental plasma physicist and a professor emeritus at the University of California, Los Angeles (UCLA). He is known for the development and construction of the Large Plasma Device (LAPD), an over 20-meter long cylindrical plasma device to study fundamental plasma processes, such as Alfvén waves and magnetic flux ropes, under laboratory conditions. He is an elected fellow of the American Physical Society.

James F. Drake is an American theoretical physicist who specializes in plasma physics. He is known for his studies on plasma instabilities and magnetic reconnection for which he was awarded the 2010 James Clerk Maxwell Prize for Plasma Physics by the American Physical Society.

Nathaniel Joseph Fisch is an American plasma physicist known for pioneering the excitation of electric currents in plasmas using electromagnetic waves, which was then used in tokamak experiments. This contributed to an increased understanding of plasma wave–particle interactions in the field for which he was awarded the James Clerk Maxwell Prize for Plasma Physics in 2005 and the Hannes Alfvén Prize in 2015.

Dmitri Dmitriyevich Ryutov is a Russian theoretical plasma physicist.

Ravindra Nath Sudan was an Indian-American electrical engineer and physicist who specialized in plasma physics. He was known for independently discovering the whistler instability in 1963, an instability which causes audible low-frequency radio waves to be emitted in the magnetosphere in the form of whistler waves. He also pioneered the study of the generation and propagation of intense ion beams, and contributed to theories of plasma instabilities and plasma turbulence.

Noah Hershkowitz was an American experimental plasma physicist. He was known for his pioneering research on the understanding of plasma sheaths, solitons and double layers in plasmas, as well as the development of the emissive probe which measures the plasma potential.

Masaaki Yamada is a Japanese plasma physicist known for his studies on magnetic reconnection.

Keith Howard Burrell is an American plasma physicist.

<span class="mw-page-title-main">Flux surface</span>

In magnetic confinement fusion, a flux surface is a surface on which magnetic field lines lie. Since the magnetic field is divergence-free, the Poincare-Hopf theorem implies that such a surface must be either a torus, or a knot. In the tokamak and the stellarator flux surfaces have toroidal shapes, whereas the more exotic knotatron has a knotted flux surface. Flux surfaces are typically characterized by the poloidal magnetic flux or the toroidal magnetic flux. The poloidal flux is the magnetic flux passing through a ribbon going from the magnetic axis to the flux surface, and the toroidal flux is the magnetic flux passing through a circle which encloses the magnetic axis. The total flux passing through flux surface itself is zero, as magnetic field lines are everywhere tangent to the surface.

References

  1. 1 2 "Reiner Stenzel". UCLA Physics & Astronomy. Retrieved January 13, 2024.
  2. "UCLA Basic Plasma Physics Lab - Research". www.physics.ucla.edu. Retrieved January 13, 2024.
  3. 1 2 3 "Reiner L. Stenzel Memorial". UCLA Physics & Astronomy. January 12, 2024. Retrieved January 19, 2024.
  4. Stenzel, R. L. (1976). "Whistler wave propagation in a large magnetoplasma". The Physics of Fluids. 19 (6): 857–864. Bibcode:1976PhFl...19..857S. doi:10.1063/1.861551. ISSN   0031-9171.
  5. Letzter, Rafi (August 15, 2018). "Plasma Scientists Created Invisible, Whooping 'Whistlers' in a Lab". Live Science. Retrieved January 13, 2024.
  6. American Institute of Physics (August 14, 2018). "New study sheds light on how ultralow frequency radio waves and plasmas interact". phys.org. Retrieved January 13, 2024.
  7. Stenzel, R. L.; Gekelman, W. (1981). "Magnetic field line reconnection experiments 1. Field topologies". Journal of Geophysical Research: Space Physics. 86 (A2): 649–658. Bibcode:1981JGR....86..649S. doi:10.1029/JA086iA02p00649. ISSN   0148-0227.
  8. Stenzel, R. L.; Urrutia, J. M.; Griskey, M.; Strohmaier, K. (2002). "A new laboratory experiment on magnetic reconnection". Physics of Plasmas. 9 (5): 1925–1930. Bibcode:2002PhPl....9.1925S. doi:10.1063/1.1459455. ISSN   1070-664X.
  9. Stenzel, R. L. (1991). "A new probe for measuring small electric fields in plasmas". Review of Scientific Instruments. 62 (1): 130–139. Bibcode:1991RScI...62..130S. doi:10.1063/1.1142514 . Retrieved January 13, 2024.
  10. Stenzel, R. L.; Urrutia, J. M. (2014). "Magnetic antenna excitation of whistler modes. II. Antenna arrays". Physics of Plasmas. 21 (12). Bibcode:2014PhPl...21l2108S. doi:10.1063/1.4904360. ISSN   1070-664X.
  11. Stenzel, Reiner L.; Urrutia, J. Manuel (2021). "Probes to measure kinetic and magnetic phenomena in plasmas". Review of Scientific Instruments. 92 (11). Bibcode:2021RScI...92k1101S. doi:10.1063/5.0059344. ISSN   0034-6748. PMID   34852543. S2CID   244734943.
  12. Stenzel, R. L. (1976). "Microwave resonator probe for localized density measurements in weakly magnetized plasmas". Review of Scientific Instruments. 47 (5): 603–607. Bibcode:1976RScI...47..603S. doi:10.1063/1.1134697. ISSN   0034-6748.
  13. 1 2 "APS Fellow Archive". www.aps.org. Retrieved January 13, 2024.
  14. Wolfson, Jill (March 7, 2012). "Two Against the Odds". Stanford Magazine. Retrieved January 13, 2024.
  15. "TWIN SISTERS' LONG STRUGGLE TO OVERCOME CYSTIC FIBROSIS SUBJECT OF DOCUMENTARY, 'THE POWER OF TWO' | Japanese American National Museum". www.janm.org. February 12, 2012. Retrieved January 13, 2024.
  16. Smolowitz, Marc (November 10, 2012), The Power of Two (Documentary), Ana Stenzel, Isabel Stenzel Byrnes, Hatsuko Stenzel, 13th Gen, Twin Triumph Productions, retrieved January 13, 2024
  17. "Section Officers History | Sierra Club". www.sierraclub.org. Retrieved January 13, 2024.
  18. "Climbing History | Sierra Club | SPS Peak Climbs: A 10-Year History of Scheduled SPS trips from 1996 - 2006". www.sierraclub.org. Retrieved January 13, 2024.