Jose Boedo

Jose A. Boedo is an American physicist, currently at University of California, San Diego and an Elected Fellow of the American Physical Society.[1][2] The APS fellowship was awarded for "his ground-breaking contributions to the studies of plasma drifts and intermittent plasma transport in the peripheral region of tokamaks".[1]

Jose A. Boedo
Alma materUniversity of Texas at Austin Universidad Simon Bolivar, Venezuela
Known forDivertors of Tokamaks
Scientific career
FieldsPhysics
InstitutionsUniversity of California, San Diego

Boedo is best known for pioneering work in the characteristics, particle and energy transport, and dynamics of the edge and scrape-off layer and divertors of tokamaks, the leading candidate device for Fusion energy. The most impacting and cited work has been on intermittent transport [3] and the role of cross-phase in transport modulation by velocity shear.[4]

Career

Early in his career, he investigated the role of externally imposed electric fields on tokamak plasmas, and corresponding velocity shear, in the suppression of turbulence. Although until then, the observed effect of velocity shear on reducing turbulence was consistent with theoretical expectations, causality had not been demonstrated and it was its existence under externally applied electric fields, and concomitant velocity shear, that closed the causality loop. Boedo characterized the reduction of transport[5] and compared the scaling of the suppression with known theories.[4] Additionally, he was the first one to show that velocity shear also reduced temperature fluctuations [6] and therefore, conductive heat flux.[7]

Boedo also investigated the effect that injected impurities on tokamak plasmas had on producing enhanced energy confinement, the so-called I-mode, and was the first to show that the enhancement in performance was due to reduction in transport and turbulence due to ITG mode suppression [Nuc. Fus. 2000].

Boedo has also done pioneering work on the role of flows and drifts in the edge, SOL (Scrape-off layer) and divertor of tokamaks. He was the first to demonstrate experimentally that once the divertor plasma is detached, there is a considerable residual heat flux that is convected by the plasma to the walls via large, Mach=1 large scale flows.[8]

It has been original work by Boedo [PoP 2000 ] that showed that the effect of ExB drifts in the SOL and divertor plasmas are significant and therefore edge simulation codes such as UEDGE and SOLPS should include drifts to properly model the boundary plasma. Furthermore, Boedo worked closely with modelers in experiment-modeling efforts, to demonstrate the relevance of the drifts.[9]

At some point in the late 1990s it was found in the ALCATOR C-Mod tokamak that plasma-wall contact was much larger than expected,[10] and it then became clear that there was some missing transport mechanism/physics in the edge/SOL in tokamaks. Pioneering work by Boedo, Rudakov, Krashenninikov, et al.[10] quantified, characterized and demonstrated experimentally that plasma was carried form the plasma edge towards the SOL and the chamber walls by intermittent, convective transport, that was then identified as resulting from interchange instability. Boedo is still involved in this topic and work continues[11] as theoretical understanding improves,[12] in particular on the scaling of intermittent transport with plasma parameters.[13]

In parallel, Boedo developed tools to study and characterize Edge Localized Modes (ELMs) at high time resolution. The heat released by ELMs towards the walls of fusion devices is a major concern for future devices. Boedo wrote a seminal paper on quantification of ELM-mediated particle and heat transport [PoP 2005] that among other results, highlighted the two-dimensional nature of the phenomena as filaments and discovered that such filaments have a complex structure.

The latest work of Dr. Boedo has been focused on the physics of intrinsic rotation in tokamaks [14] and the realization that asymmetric, thermal ion loss is a significant mechanism on determining a source of rotation at the edge of the plasma that then is transported into the core. Recent publications have identified and characterized the edge rotation from the theoretical point of view [15] and compared it to existing models,[16][17]

Significant Contributions

Boedo has also made significant contributions in diagnostic development for plasmas. He is known for the development of high heat flux, fixed[5] and reciprocating, scanning probes, such as that built for the NSTX tokamak,[18] a rotating Langmuir probe, and also an innovative diagnostic to measure electron temperature with better than 400 kHz bandwidth.[19]

Main 8 Publications (by meaning and impact)

-Experimental evidence of edge intrinsic momentum source driven by kinetic ion loss and edge radial electric fields in tokamaks.[14]

-Transport by intermittent convection in the boundary of the DIII-D tokamak, PoP 8 (11) 4826, 2001

-Transport by intermittency in the boundary of the DIII-D tokamak, PoP 10 (5) 1670, 2003

-Enhanced particle confinement and turbulence reduction due to ExB shear in the TEXTOR tokamak, Nuc. Fuc. 40 (7), 1397, 2000

-Edge-localized mode dynamics and transport in the scrape-off layer of the DIII-D tokamak, Nuc. Fus., 45 (10), S168, 2005

-Scaling of plasma turbulence suppression with velocity shear, PoP, 7 (9), 3663, 2000

-Suppression of temperature fluctuations and energy barrier generation by velocity shear, PRL, 49 (10), 104016, 2009

-On the harmonic technique to measure electron temperature with high time resolution, RSI, 0 (7), 2997, 1999

-Electric field-induced plasma convection in tokamak divertors, PoP, 15 (3), 2008

Other contributions (invited talks, services, etc.)

2014 APS DPP, New Orleans, Louisiana, invited talk

2008 EPS invited talk.

2004 EPS, London Invited talk.

2004 APS DPP, contributed talk.

2001 US-European Transport Task Force, Faribanks, Alaska. Invited talk.

1999 US-European transport task force, Portland Oregon, invited talk

References
  1. "Fellows". American Physical Society. Retrieved April 20, 2017.
  2. "Jose Boedo". ucsd.edu. Retrieved April 20, 2017.
  3. Rudakov, D. L.; Boedo, J. A.; Moyer, R. A.; Krasheninnikov, S.; Leonard, A. W.; Mahdavi, M. A.; McKee, G. R.; Porter, G. D.; Stangeby, P. C.; Watkins, J. G.; West, W. P.; Whyte, D. G.; Antar, G. (2002). "Fluctuation-driven transport in the DIII-D boundary". Plasma Physics and Controlled Fusion. 44 (6): 717–731. Bibcode:2002PPCF...44..717R. doi:10.1088/0741-3335/44/6/308.
  4. Boedo, J.A; Gray, D.S; Terry, P.W; Jachmich, S.; Tynan, G.R; Conn, R.W (2002). "Scaling of plasma turbulence suppression with velocity shear". Nuclear Fusion. 42 (2): 117–121. Bibcode:2002NucFu..42..117B. doi:10.1088/0029-5515/42/2/301.
  5. Boedo, J.; Gunner, G.; Gray, D.; Conn, R. (2001). "Robust Langmuir probe circuitry for fusion research". Review of Scientific Instruments. 72 (2): 1379. Bibcode:2001RScI...72.1379B. doi:10.1063/1.1340023.
  6. Boedo, J. A.; Terry, P. W.; Gray, D.; Ivanov, R. S.; Conn, R. W.; Jachmich, S.; Van Oost, G.; The Textor Team (2000). "Suppression of Temperature Fluctuations and Energy Barrier Generation by Velocity Shear" (PDF). Physical Review Letters. 84 (12): 2630–2633. Bibcode:2000PhRvL..84.2630B. doi:10.1103/PhysRevLett.84.2630.
  7. http://www.thermopedia.com/content/1033/
  8. Boedo, J. A.; Porter, G. D.; Schaffer, M. J.; Lehmer, R.; Moyer, R. A.; Watkins, J. G.; Evans, T. E.; Lasnier, C. J.; Leonard, A. W.; Allen, S. L. (1998). "Flow reversal, convection, and modeling in the DIII-D divertor". Physics of Plasmas. 5 (12): 4305–4310. Bibcode:1998PhPl....5.4305B. doi:10.1063/1.873168.
  9. Boedo, J. A.; Schaffer, M. J.; Maingi, R.; Lasnier, C. J. (2000). "Electric field-induced plasma convection in tokamak divertors". Physics of Plasmas. 7 (4): 1075–1078. Bibcode:2000PhPl....7.1075B. doi:10.1063/1.873915.
  10. Boedo, J. A.; Rudakov, D.; Moyer, R.; Krasheninnikov, S.; Whyte, D.; McKee, G.; Tynan, G.; Schaffer, M.; Stangeby, P.; West, P.; Allen, S.; Evans, T.; Fonck, R.; Hollmann, E.; Leonard, A.; Mahdavi, A.; Porter, G.; Tillack, M.; Antar, G. (2001). "Transport by intermittent convection in the boundary of the DIII-D tokamak". Physics of Plasmas. 8 (11): 4826–4833. Bibcode:2001PhPl....8.4826B. doi:10.1063/1.1406940.
  11. Boedo, J. A.; Myra, J. R.; Zweben, S.; Maingi, R.; Maqueda, R. J.; Soukhanovskii, V. A.; Ahn, J. W.; Canik, J.; Crocker, N.; d'Ippolito, D. A.; Bell, R.; Kugel, H.; Leblanc, B.; Roquemore, L. A.; Rudakov, D. L. (2014). "Edge transport studies in the edge and scrape-off layer of the National Spherical Torus Experiment with Langmuir probes". Physics of Plasmas. 21 (4): 042309. Bibcode:2014PhPl...21d2309B. doi:10.1063/1.4873390.
  12. Myra, J. R.; d'Ippolito, D. A. (2005). "Edge instability regimes with applications to blob transport and the quasicoherent mode". Physics of Plasmas. 12 (9): 092511. Bibcode:2005PhPl...12i2511M. doi:10.1063/1.2048847.
  13. Tsui, C. K.; Boedo, J. A.; Myra, J. R.; Duval, B.; Labit, B.; Theiler, C.; Vianello, N.; Vijvers, W. A. J.; Reimerdes, H.; Coda, S.; Février, O.; Harrison, J. R.; Horacek, J.; Lipschultz, B.; Maurizio, R.; Nespoli, F.; Sheikh, U.; Verhaegh, K.; Walkden, N. (2018). "Filamentary velocity scaling validation in the TCV tokamak". Physics of Plasmas. 25 (7): 072506. Bibcode:2018PhPl...25g2506T. doi:10.1063/1.5038019.
  14. Boedo, J. A.; Degrassie, J. S.; Grierson, B.; Stoltzfus-Dueck, T.; Battaglia, D. J.; Rudakov, D. L.; Belli, E. A.; Groebner, R. J.; Hollmann, E.; Lasnier, C.; Solomon, W. M.; Unterberg, E. A.; Watkins, J. (2016). "Experimental evidence of edge intrinsic momentum source driven by kinetic ion loss and edge radial electric fields in tokamaks". Physics of Plasmas. 23 (9): 092506. Bibcode:2016PhPl...23i2506B. doi:10.1063/1.4962683.
  15. Degrassie, J. S.; Boedo, J. A.; Grierson, B. A. (2015). "Thermal ion orbit loss and radial electric field in DIII-D". Physics of Plasmas. 22 (8): 080701. Bibcode:2015PhPl...22h0701D. doi:10.1063/1.4928558.
  16. Müller, S. H.; Boedo, J. A.; Burrell, K. H.; Degrassie, J. S.; Moyer, R. A.; Rudakov, D. L.; Solomon, W. M.; Tynan, G. R. (2011). "Intrinsic rotation generation in ELM-free H-mode plasmas in the DIII-D tokamak—Experimental observations". Physics of Plasmas. 18 (7): 072504. Bibcode:2011PhPl...18g2504M. doi:10.1063/1.3605041.
  17. http://apps.webofknowledge.com/full_record.do?product=WOS&search_mode=GeneralSearch&qid=1&SID=7CE9UZUWELr3SAnPN89&page=2&doc=54
  18. Boedo, J. A.; Crocker, N.; Chousal, L.; Hernandez, R.; Chalfant, J.; Kugel, H.; Roney, P.; Wertenbaker, J. (2009). "Fast scanning probe for the NSTX spherical tokamak". Review of Scientific Instruments. 80 (12): 123506–123506–10. Bibcode:2009RScI...80l3506B. doi:10.1063/1.3266065.
  19. Boedo, J. A.; Gray, D.; Conn, R. W.; Luong, P.; Schaffer, M.; Ivanov, R. S.; Chernilevsky, A. V.; Van Oost, G. (1999). "On the harmonic technique to measure electron temperature with high time resolution". Review of Scientific Instruments. 70 (7): 2997–3006. Bibcode:1999RScI...70.2997B. doi:10.1063/1.1149888.
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