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Benjamin Longmier | Faculty

Benjamin Longmier

Assistant Professor, Aerospace Engineering

Administration Appointment

3017 FXB
longmier@umich.edu
(734) 764-6792

 

 

Short Bio

Ben Longmier is an assistant professor in the Aerospace Engineering Department at the University of Michigan. He is developing the next generation of advanced thrusters from 10W to 200kW to enable wide access to remote destinations within the solar system. To enable this, his research interests center on electric propulsion, spacecraft and aerostat design, basic plasma physics, plasma materials interaction, and plasma diagnostics.

EDUCATION

University of Wisconsin
PhD Engineering Physics '07
MS Engineering Physics '05
BS Nuclear Engineering '04

SOCIETY MEMBERSHIPS

  • American Physical Society
  • American Institute of Aeronautics and Astronautics
  • Experimental Aircraft Association
  • Aircraft Owners and Pilots Association
  • EPRS
  • Tau Beta Pi

Research Interests

Electric Propulsion, Space Propulsion, Plasma Physics, Space Systems

Fall 2013

AE 536: TTH 1:30 - 3:00, 1008 FXB

Office Hrs: T/TH 1:30-3:00

Honors and Awards

  • Honorary member of Asociación Centroamericana de Aeronáutica y del Espacio (2010-Present)
  • Special Service Citation, AIAA (2008)
  • Public Service Award, AIAA-Houston (2008)
  • Wisconsin Space Grant Consortium Graduate Fellowship (2006, 2007)

Selected Publications

PATENTS

  • N. Hershkowitz, B. Longmier, S. Baalrud, Non-Ambipolar Radio-Frequency Plasma Electron Source and Systems and Methods for Generating Electron Beams, U.S. Patent 7,875,867 Jan 25, 2011.
  • N. Hershkowitz, B. Longmier, S. Baalrud, Non-Ambipolar Radio-Frequency Plasma Electron Source and Systems and Methods for Generating Electron Beams, U.S. Patent 7,498,592, Mar. 3, 2009.

PEER-REVIEWED PUBLICATIONS

  • B. Longmier, , J. Squire, C. Olsen, L. Cassady, M. Ballenger, M. Carter, A. Ilin, T. Glover, G. McCaskill, F. Chang-Díaz, E. Bering, Improved Efficiency and Throttling Range of the VX-200 Magnetoplasma Thruster, Journal of Propulsion and Power, AIAA, (2012). – In review
  • Longmier, A. Gallimore, N. Hershkowitz, Hydrogen production from methane using an RF plasma source in total nonambipolar flow, Plasma Sources Sci. Technol. 21 015007 (2012).
  • B. Longmier, L. Cassady, M. Ballenger, M. Carter, F. Chang-Díaz, T. Glover, A. Ilin, G. McCaskill, C. Olsen, J. Squire, E. Bering, VX-200 Magnetoplasma Thruster Performance Results Exceeding Fifty-Percent Thruster Efficiency, Journal of Propulsion and Power, AIAA, Vol. 27, No. 4, (2011).
  • B. Longmier, E. Bering III, M. Carter, L. Cassady, W. Chancery, F. Chang Díaz, T. Glover, N. Hershkowitz, A. Ilin, G. McCaskill, C. Olsen, J. Squire, Ambipolar Ion Acceleration in an Expanding Magnetic Nozzle, Plasma Sources Sci. Technol. 20, 015007 (2011).
  • E. Bering III, F. Chang Díaz, J. Squire, T. Glover, M. Carter, G. McCaskill, B. Longmier, M. Brukardt, W. Chancery, V. Jacobson, Observations of single-pass ion cyclotron heating in a trans-sonic flowing plasma, Physics of Plasmas 17, 043509 (2010).
  • S.D. Baalrud, B. Longmier, N. Hershkowitz, Equilibrium states of anodic double layers, Plasma Sources Sci. and Technol. 18 035002, (2009).
  • B. Longmier, A. Gallimore, F. Chang Diaz, J. Squire, G. Chavers, T. Glover, E. Bering III, B. Ried, Validating a Plasma Momentum Flux Sensor Against an Inverted Pendulum Thrust Stand, AIAA Journal of Propulsion and Power, Vol. 25, No. 3, pp. 746-752, (2009).
  • B. Longmier, N. Hershkowitz, Improved Operation of the Nonambipolar Electron Source, Rev. Sci. Instrum., 79, 093506 (2008).
  • S. Baalrud, B. Longmier, N. Hershkowitz, Global Nonambipolar Flow: Plasma confinement where all electrons are lost to one boundary and all positive ions to another boundary, Phys. Plasmas 14, 042109 (2007).
  • B. Longmier, N. Hershkowitz, Nonambipolar Electron Source, Rev. Sci. Instrum. 77, 113504 (2006).

CONFERENCE PUBLICATIONS

  • C. Olsen, M. Ballenger, J. Squire, B. Longmier, M. Carter, T. Glover, Turbulence-induced anomalous electron diffusion in the plume of the VASIMR VX-200, 65th Annual Gaseous Electronics Conference, Volume 57, Number 8, October 22–26, 2012; Austin, Texas
  • C. Olsen, B. Longmier, M. Ballenger, J. Squire, T. Glover, M. Carter, E. Bering, M. Giambusso, Overview of the electric propulsion plasma diagnostics suite for the VASIMR VX-200 testbed, 65th Annual Gaseous Electronics Conference, Volume 57, Number 8, October 22–26, 2012; Austin, Texas
  • J. Squire, C. Olsen, F. Chang-Diaz, B. Longmier, M. Ballenger, M. Carter, T. Glover, G. McCaskill, VASIMR VX-200 thruster throttling optimization from 30 to 200 kW, 65th Annual Gaseous Electronics Conference, Volume 57, Number 8, October 22–26, 2012; Austin, Texas
  • B. Longmier, , J. Squire, C. Olsen, L. Cassady, M. Ballenger, M. Carter, A. Ilin, T. Glover, G. McCaskill, F. Chang-Díaz, E. Bering, Improved Efficiency and Throttling Range of the VX-200 Magnetoplasma Thruster,AIAA-2012-3930, 48th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit, Atlanta, GA, July 29 - August 1, 2012.
  • F.H. Ebersohn; S.S. Girimaji; J. Shebalin; D. Staack; B.W. Longmier; C. Olsen, Magnetic Nozzle Plasma Plume: Review of Crucial Physical Phenomena, AIAA-2012-4274, 48th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit, Atlanta, GA, July 29 - August 1, 2012.
  • B.W. Longmier, E.A. Bering, N. Hershkowitz, A.D. Gallimore, CubeSat Primary Propulsion Using A High Power Density Helicon Plasma Source For Ambipolar Ion Acceleration, JANNAF 8th MSS/6th LPS/5th SPS Joint Subcommittee Meeting 5–9 December, 2011.
  • E.A. Bering, C.S. Olsen, B.W. Longmier, M. Ballenger, M. Giambusso, M.D Carter, L. Cassady, F.R. Chang-Díaz, T. Glover, G. McCaskill, and J.P. Squire, Application of the Physics of Wave-Particle Interactions in the Auroral Upward Current Region for Use in the VASIMR® Deep Space Electric Propulsion System, EOS, Trans. AGU, 92(52 Fall Meet. Suppl.), Abstract SM13B-2084, AGU, San Francisco, Calif., 4-9 Dec. 2011.
  • C.S. Olsen, J.P. Squire, B.W. Longmier, M.G. Ballenger, L. D. Cassady, M.D. Carter, A.V. Ilin, P.A. Cloutier, E.A. Bering, M. Giambusso, Experimental determination of plasma detachment from the diverging magnetic nozzle of the VASIMR® VX-200 Electric Thruster, Paper PP9.00163, 53rd Annual Meeting of the APS Division of Plasma Physics, Salt Lake City, UT, November 14-18, 2011.
  • E.A Bering, B.W. Longmier, C.S. Olsen, L.D. Cassady, J.P. Squire, and F.R. Chang-Díaz, VASIMR: Deep Space Transportation for the 21st Century, AIAA-2011-7247, AIAA SPACE 2011 Conference and Exposition, Long Beach, California, Sep. 27-29, 2011.
  • B.W. Longmier, et al. VASIMR VX-200 Performance Measurements and Helicon Throttle Tables Using Argon and Krypton, IEPC-2011-156, 32nd International Electric Propulsion Conference, Wiesbaden, Germany, Sept 11-15, 2011.
  • J.P. Squire, F.R. Chang Díaz , L.D. Cassady, B.W. Longmier, C.S. Olsen, M.G. Ballenger, M.D. Carter, T.W. Glover and G.E. McCaskill, E.A. Bering, III, VASIMR VX-200 Operation at 200 kW and Plume Measurements; Future Plans and an ISS EP Test Platform, IEPC-2011-154, 32nd International Electric Propulsion Conference, Wiesbaden, Germany, Sept 11-15, 2011.
  • J.I. Del Valle Gamboa, S. Cortés Godoy, L. Diego Fonseca Flores, J. Oguilve-Araya, J.J. Valverde Quirós, C. Martínez Castillo, D. Ixcamparij Rojas, R. Chang-Díaz, B.W. Longmier, T.W. Glover, J.P. Squire, F.R. Chang-Díaz, The VX-CR Experiment: A Thermal and Lifetime Testbed for the VASIMR Engine, IEPC-2011-15, 32nd International Electric Propulsion Conference, Wiesbaden, Germany, Sept 11-15, 2011.
  • E.A. Bering, III, B.W. Longmier, M. Ballenger, C.S. Olsen, J.P. Squire, F.R. Chang Díaz, Performance studies of the VASIMR VX-200, AIAA-2011-1071, 49th AIAA Aerospace Sciences Meeting and Exhibit, Orlando, FL, 4-7 January 2011
  • B.W. Longmier, E.A. Bering, J.P. Squire, T.W. Glover, L.D. Cassady, A.V. Ilin, M.D. Carter, C.S. Olsen, G.E. McCaskill, F.R. Chang Díaz, Performance Measurements and Technology Demonstration of the VASIMR VX-200, EOS, Trans. AGU, 91(52 Fall Meet. Suppl.), Abstract SM21A-1890 presented at 2010 Fall Meeting, AGU, San Francisco, Calif., 13-17 Dec. 2010
  • T. Glover, J.P. Squire, B.W. Longmier, M.D. Carter, A.V. Ilin, L.D. Cassady, C.S. Olsen, F.R. Chang Díaz, G.E. McCaskill, E.A. Bering, D. Garrison, S. Girimaji, D. Araya, L. Morin, J. V. Shebalin, The VASIMR VF-200-1 ISS Experiment as a Laboratory for Astrophysics, EOS, Trans. AGU, 91(52 Fall Meet. Suppl.), Abstract SM51C-1831 presented at 2010 Fall Meeting, AGU, San Francisco, Calif., 13-17 Dec. 2010
  • B.W. Longmier, J.P. Squire, L.D. Cassady, C.S. Olsen, M.G. Ballenger, T.W. Glover, M.D. Carter, G.E. McCaskill, F.R. Chang Díaz, and E.A. Bering III, Performance and Exhaust Plume Measurements of the VASIMR VX-200, AIAA Annual Technical Symposium, Houston, TX, April 29, 2010
  • L.D. Cassady, B.W. Longmier, C.O. Olsen, M.G. Ballenger, G.E. McCaskill, A.V. Ilin, M.D. Carter, T.W. Glover, J.P. Squire, F.R. Chang Díaz, VASIMR Performance Results, 46th AIAA Joint Propulsion Conference & Exhibit, AIAA-2010-6772, Nashville, TN, 25-28 July, 2010.
  • E.A. Bering, III, B.W. Longmier, J.P. Squire, T.W. Glover, L.D. Cassady, A.V. Ilin, M.D. Carter, C.S. Olsen, G.E. McCaskill, F.R. Chang Díaz, Performance Measurements and Technology Demonstration of the VASIMR VX-200, AIAA-2010-8673, AIAA Space 2010 Conference and Exposition, Anaheim, CA, Aug 30 – Sep 2, 2010
  • E. Bering, III, B. Longmier, W. Chancery, C. Olsen, J. Squire, and F. Chang Díaz, Exhaust plume spatial structure of the VASIMR VX-200, Paper AIAA-2009-0622 in Proceedings of the 48th AIAA Aerospace Sciences Meeting, 4-7 January, 2010, Orlando, FL, 2010.
  • B.W. Longmier, M.S. Brukardt, E.A. Bering, C.S. Olsen, M. Ballenger, F. Chang Díaz, and J.P. Squire, High Power Ion Cyclotron Heating in the VASIMR, EOS, Trans. AGU, 90(52 Fall Meet. Suppl.), Abstract SM53A-1364, 2009.
  • J.P. Squire , L.D. Cassady , F.R. Chang Díaz , M.D. Carter , T.G. Glover , A.V. Ilin , B.W. Longmier, G.E. McCaskill , C.S. Olsen, E.A. Bering, Superconducting 200 kW VASIMR Experiment and Integrated Testing, IEPC-2009-209, 31st International Electric Propulsion Conference, University of Michigan - Ann Arbor, Michigan, USA, Sept. 20 – 24, 2009.
  • E.A. Bering, B.W. Longmier, T.W. Glover, F.R. Chang Díaz, J.P. Squire, M.D. Carter, L.D. Cassady, C.S. Olsen, G.E. McCaskill, W.J. Chancery, VASIMR VX-200: High power electric propulsion for space transportation beyond LEO, AIAA Space 2009 Conference and Exposition, Pasadena, CA, 14-17 September, 2009.
  • B.W. Longmier, J.P. Squire, M.D. Carter, L.D. Cassady, T.W. Glover, W.J. Chancery, C.S. Olsen, A.V. Ilin, G.E. McCaskill, and F.R. Chang Díaz, Ambipolar Ion Acceleration in the Expanding Magnetic Nozzle of the VASIMR VX-200i, 45th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, AIAA-2009-5359, Denver, CO, 2-5 August, 2009.
  • L.D. Cassady, W.J. Chancery, B.W. Longmier, C.S. Olsen, G.E. McCaskill, M.D. Carter, T.W. Glover, J.P. Squire, F.R. Chang Díaz, and E.A. Bering, VASIMR Technological Advances and First Stage Performance Results, 45th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, AIAA-2009-5359, Denver, CO, 2-5 August, 2009.
  • B.W. Longmier, E.A Bering, J.P. Squire, T.W. Glover, F.R. Chang-Diaz, M.S. Brukardt, Thrust and Exhaust Plume Measurements of the VASIMR VX-200, 47th AIAA Aerospace Sciences Meeting and Exhibit, Orlando, FL, 2009.
  • E. Bering, III, B. Longmier, T. Glover, F. Chang-Díaz, J. Squire, and M. Brukardt., High power electric propulsion using the VASIMR VX-200: A flight technology demonstrator, Paper AIAA-2009-245 presented at the 47th AIAA Aerospace Sciences Meeting, Orlando, FL, 5-8 January, 2009.
  • E. Bering, III, B. Longmier, J. Squire, T. Glover, F. Chang-Díaz, and M. Brukardt, High power electric propulsion using the VASIMR VX-200: A flight technology prototype, Bulletin of the American Physical Society, 53(14 Suppl. 50th Annual Meeting of the Division of Plasma Physics), 216, 2008.
  • E. Bering, III, B. Longmier, F. Chang-Díaz, J. Squire, T. Glover, and M. Brukardt., VASIMR VX-100: High power electric propulsion for space transportation beyond LEO, Paper AIAA-2008-7623 presented at the AIAA Space 2008 Conference and Exposition, San Diego, CA, 9-11 September, 2008.
  • J.P. Squire, F.R. Chang Diaz, M.D. Carter, L.D. Cassady, W.J. Chancery, T.W. Glover, V.T. Jacobson, G.E. McCaskill, E.A. Bering, B.W. Longmier, High Power VASIMR Performance Measurements, Annual Technical Symposium (ATS), NASA Johnson Space Center, Houston, TX, 2008.
  • B. Longmier, A. Gallimore, F. Chang-Diaz, J. Squire, G. Chavers, T. Glover, E. Bering III, B. Ried, Validating a Plasma Momentum Flux Sensor with a Hall Thruster mounted on an Inverted Pendulum Thrust Stand, 44th AIAA/ASME/SAE/ASEE Joint Propulsion Conference, Hartford, CT, 2008.
  • E. Bering, III, B. Longmier, F. Chang Díaz, J. Squire, V. Jacobson, and M. Brukardt, VASIMR VX-100 Engine: Next step to high power electric propulsion, in Proceedings of the 46th AIAA Aerospace Sciences Meeting and Exhibit, 7-10 January, 2008, AIAA, Reno, NV, 2008.
  • M.S. Brukardt, E.A. Bering III, B.W. Longmier, F.R. Chang Díaz, J.P. Squire, T.W. Glover, V.T. Jacobson, G.E. McCaskill, and L.D. Cassady, The VASIMR ion cyclotron heating experiment, National Radio Science Meeting, 3-6 January, 2008, edited by P. G. Uslenghi, USNC/URSI, Boulder, CO, 2008.
  • M.S. Brukardt, E.A. Bering, F.R. Chang Díaz, J.P. Squire, and B.W. Longmier, Ion cyclotron waves in the VASIMR, EOS, Trans. AGU, 89 (53 Fall Meet. Suppl.), Abstract SM31A-1683, 2008.
  • E.A. Bering, F.R. Chang Díaz, J.P. Squire, T.W. Glover, L.D. Cassady, V.T. Jacobson, W.J. Chancery, and B.W. Longmier, M. Brukardt, Use of auroral processes in spacecraft propulsion: A VASIMR VX-100 status report, EOS, Trans. AGU, 88(52 Fall Meet. Suppl.), Abstract SM23B-1405, 2007.
  • N. Hershkowitz, B. Longmier, Xenon Operation of the Nonambipolar Electron Source, American Physical Society, 60th Annual Gaseous Electronics Conference, Arlington, VA, 2007.
  • M. Brukardt, E.A. Bering, F.R. Chang Diaz, J.P. Squire, T.W. Glover, L.D. Cassady, V.T. Jacobson, W.J. Chancery, B.W. Longmier, Use of Auroral Processes in Spacecraft Propulsion: A VASIMR VX-100 Status Report, American Geophysical Union, abstract #SM23B-1405, 2007
  • E.A. Bering III, T.W. Glover, F.R. Chang-Diaz, J.P. Squire, L.D. Cassady, M.S. Brukardt, B. Longmier, VASIMR: A Private Enterprise Solution to Space Transportation Beyond LEO, Space 2007, Long Beach, CA, 2007.
  • B. Longmier, S. Baalrud, N. Hershkowitz, Xenon Operation with the Nonambipolar Electron Source, 34th International Conference on Plasma Science, Albuquerque, NM, ICOPS 2007.
  • B. Longmier, N. Hershkowitz, Development Status of the Nonambipolar Electron, International Electric Propulsion Conference, Florence, Italy, IEPC-2007-272, 2007.
  • B. Longmier, N. Hershkowitz, Helicon Mode and Xenon Operation with the Nonambipolar Electron Source, 43rd AIAA/ASME/SAE/ASEE Joint Propulsion Conference, 2007.
  • B. Longmier, N. Hershkowitz, Radio Frequency Plasma-Based Non-Ambipolar Electron Source, American Physical Society, Division of Plasma Physics, 2006.
  • B. Longmier, N. Hershkowitz, Non-Ambipolar Electron Source as a Replacement for Hollow Cathodes, 42nd AIAA/ASME/SAE/ASEE Joint Propulsion Conference, 2006.
  • B. Longmier, N. Hershkowitz, Non-Ambipolar Electron Extraction from a Weakly Magnetized RF Plasma, 33rd International Conference on Plasma Science, Traverse City, MI, ICOPS 2006.
  • B. Longmier, Advances in Ion Propulsion, Wisconsin Space Conference, August 10-11, Marquette, WI. Wisconsin Space Grant Consortium, 2006.
  • N. Hershkowitz, B. Longmier, S. Baalrud, Total Non-Ambipolar RF Electron Source – Better than a Hollow Cathode, American Physical Society, 59th Annual Gaseous Electronics Conference, Columbus, OH, 2006.
  • B. Longmier and N. Hershkowitz, Nonambipolar Electron Source for Neutralization of Ion and Hall Thrusters, International Electric Propulsion Conference, Princeton, NJ, IEPC-2005-301, 2005.
  • N. Hershkowitz, S. Baalrud, B. Longmier, Electron Sheaths In Low-Pressure Weakly Collisional Plasma, APS, 58th Annual Gaseous Electronics Conference, San Jose, CA, 2005.
  • B. Longmier, M. Schneider, Long Duration Fluorescence Imaging of the Richtmyer-Meshkov Fluid Instability, Wisconsin Space Conference, Madison, WI. WSGC, 2005.
  • B. Longmier, N Hershkowitz, Electric Propulsion Using Neutralizing Electrodeless Helicon Plasma Cathodes, 41st AIAA/ASME/SAE/ASEE Joint Propulsion Conference, 2005.
  • N. Hershkowitz, S. Baalrud, B. Longmier, Electron Sheaths In Low-Pressure Weakly Collisional Plasma, 32nd International Conference on Plasma Science, ICOPS 2005.