PLASMA SEMINARS AND GROUP MEETINGS

Past seminar database:
Autumn 2007; Winter-Spring 2008; Summer 2008; Autumn 2008; HT 2009;; Summer 2009; MT 2009; HT 2009;2010; Summer 2010; MT 2010; HT 2011;;; MT 2011; HT 2012; TT 2012; Summer 2012; MT 2012; HT 2013; TT & Summer 2013; MT 2013; HT 2014; TT & Summer 2014; MT 2014; HT 2015; TT & Summer 2015; MT 2015; HT 2016; TT & Summer 2016; Autumn/MT 2016; HT 2017; TT & Summer 2017; Autumn/MT 2017; HT 2018;

Trinity Term & Summer of 2018

The seminars/group meetings will be on Thursday at 11:30 in Jack Paton Room, Beecroft Building, except where indicated otherwise below.

 If you know exactly what you are going to do, what is the point of doing it? Pablo Picasso Every line in your calculations ends with "=0". You are not making much progress! Kate Hammett We don't do the calculation because we don't know the answer, we do it because we have a conscience. Bryan Taylor Let's change the resolution on the Unknown. Gabe Plunk Let me put it differently: suppose we had a reactor... Per Helander Working together takes more than one person. Bill Dorland We can't do ultraviolence to that square bracket. Ian Abel Field lines are forever. Bryan Taylor This is not really an ill-posed problem, this is not a problem at all. Paul Dellar I am just doing mathematics at the moment, but it is mathematics that has some point. Bryan Taylor The equivalent of God in MAST is MHD, which is global and all powerful. Anthony Field I've got a fishbone coming up. Tim Horbury We have crossed all the i's and dotted all the t's. Job's a good'un. Ian Abel Let us not jump in front of the bandwagon! Alex Schekochihin It's not the triviality, it's the emptiness of it that bothers me. Bryan Taylor Never take 0 for an answer. Alex Schekochihin This is a very inefficient way of achieving nothing. François Rincon We Hankel all the way in and then Hankel all the way out. Joseph Parker For the sake of fairness, let me mention that some people have objections to this, none of which are particularly valid. Chris Chen Yes, Steve, you have always known what we have only just figured out. Alfred Mallet It is better to be roughly right than precisely wrong. Maynard Keynes  This is more or less right. Perhaps less. Alfred Mallet You go ahead with your argument. I'll think. Steve Cowley Too simple? At the end of my talk, you will beg for simplicity! Andrey Beresnyak The point is not the point! Anonymous This is why I am presenting this here and nowhere else: nothing is solved! Ian Abel This calculation is not intellectual masturbation: there's no orgasm. Anonymous There are many big Buts here... I like big Buts. Matt Kunz Previous studies of this problem have been either unsatisfactory or limited in scope.---What  is the difference between these?---This means either wrong or irrelevant. Anatoly Spitkovsky, Michael Medvedev and Steve Cowley (in conversation) I don't give a damn about astrophysics, explain to me what is going on. Anatoly Spitkovsky Have you subtracted the baby with the bathwater? Steve Balbus   This is not rigour, unless you mean rigor mortis. Ian Abel I wouldn't say these are theoretical arguments... Let's just call them arguments. François Rincon You can never be too happy with the state of your closure. Amitava Bhattacharjee For this plot, 1 is 6.--- Weeell, not even. Steve Cowley and Steve Balbus Это качественное объяснение недостаточно качественное. Eugene Churazov If you mean it seriously, this is actually a very good question. Minhyong Kim This paper is a tour de farce. Ian Abel What is modelling? You run a simulation, you compare. If it coincides, great! If it doesn't coincide, fuck! Felix Parra We are stuck at x=0. Felix Parra
[these quotes are mostly from Oxford plasma seminars and Vienna meetings]

 Wk Date Time & place Speaker & Topic Background reading Comings and goings (incl. visitors in town) Thu Apr 12 No seminar 0 Thu Apr 19. 11:30 501 DWB Plasma Group Meeting (organised by FELIX) Free discussion I Thu Apr 26 11:30 501 DWB Plasma Seminar (organised by GIANLUCA & ALEX) Ravindra Kumar (TIFR) --- Ultrafast dynamics of hot, dense plasmas created by relativistic-intensity, femtosecond lasers I will present the femtosecond/picosecond dynamics of the hot, dense matter created by 30 femtosecond, relativistic intensity, 800 nm laser pulses. Specific examples presented will include (a) mapping the lifetime of dense, relativistic electron bunches in a solid via picosecond gated Cherenkov emission and (b) shock propagation and shock control. PRL 120, 065001 (2018) PoP 24, 072702 (2017) PRL 114, 115001 (2015) Ravindra Kumar (TIFR) II Thu May 3 11:30Paton Rm Plasma Seminar (organised by FELIX) Jesus Ramos (MIT) --- Landau damping of sound waves in kinetic magnetohydrodynamics JPP 83, 725830601 (2017) Ravindra Kumar (TIFR) Jesus Ramos (MIT) III Thu May 10 11:30Paton Rm Plasma Seminar (organised by ALEX) Luca Franci (Queen Mary) --- Interplay between plasma turbulence and magnetic reconnection around and below the ion characteristic scales ApJ 850, L16 (2017) ApJ 853, 26 (2018) Luca Franci (Queen Mary) Edmund Highcock (Chalmers) IV Mon May 14 13:00 Paton Rm Orion/GSI Experimental Meeting (organised by GIANLUCA) 13:00 G. Gregori --- Overview of particle acceleration experiments 13:30 A. Bott --- Omega turbulent amplification 14:30 B. Albertazzi --- LULI2000 Blast wave experiments 15:00 C. Palmer --- GSI planning 15:30 Tea/Coffeee 16:00 A. Casner --- Overview of LULI2000 TurboHEDP experiments and Orion simulations 17:00 Scheduling and targets Maurizio Ottaviani (CEA) Thu May 17 11:30Paton Rm Plasma Seminar (organised by ALEX) Maurizio Ottaviani (CEA Cadarache) --- Fast secondary reconnection and the sawtooth crash PoP 24, 012102 (2017) V Thu May 24 11:30 501 DWB Plasma Group Meeting (organised by ALEX) Plamen Ivanov --- Zonal flows and drift waves: recent progress, in Oxford and elsewhere PoP 25, 012308 (2018) PPCF 59, 055002 (2017) JPP 83, 905830504 (2017) PoP 25, 022505 (2018) PoP 25, 052102 (2018) arXiv:1805.02233 arXiv:1805.04086 VI Thu May 31 11:30 501 DWB Plasma Seminar (organised by MICHAEL) Will Potter (Oxford Astro) --- Magnetisation and reconnection rates in jets MNRAS 465, 337 (2017) VII Thu June 7. 11:30 501 DWB Plasma Group Meeting (organised by FELIX) TBA VIII Thu June 14 11:30 501 DWB Plasma Seminar (organised by ALEX) Anatoly Neishtadt (Loughborough) --- Long term behaviour of slow-fast systems with passages through resonances: examples from charged particles dynamics The talk will be devoted to  effects of resonances in so-called systems with fast rotating phases. Principal phenomena here are capture into a resonance and scattering on resonances. The considered systems contain a small parameter, epsilon. In the first part of the talk, time intervals of length 1/epsilon will be considered. In the second part of the talk, results from the first part will be used to describe dynamics on time intervals of length >>1/epsilon. Arnold, Kozlov, Neishtadt, Mathematical aspects of classical and celestial mechanics (Springer, 2006), Sec. 6.1.7 Ruth Math Surv 69, 771 (2014) (towards end of this review) Physica D 141, 281 (2000) JETP Lett 89, 441 (2009) PoP 23, 090701 (2016) JPP 84, 905840206 (2018) Bill Dorland (Maryland) Romain Meyrand (LPP, Paris) Anatoly Neishtadt (Loughborough) 9 Thu June 21. 11:30 501 DWB Plasma Group Meeting (organised by FELIX) Open mic discussion Thu June 28 11:30 501 DWB Plasma Seminar (organised by ALEX) Sir Steve Cowley (Oxford--->Princeton) --- Secondary reconnection and explosive instability Thu/Fri July 5-6 Rudolf Peierls Symposium on Theoretical Physics Ben Chandran (UNH) Nuno Loureiro (MIT) Eliot Quataert (UC Berkeley) July 9-13 Planets, Stars and Discs: A Golden Age for Particle and Gas Dynamics (Celebrating the 70th birthday of John Papaloizou) Ben Chandran (UNH) Thu July 12 No plasma seminar, do go to the conference talks Thu July 19 11:30Paton Rm Plasma Group Meeting (organised by ALEX) Plamen Ivanov and Valerian Chen --- report on the EPS Plasma Conference Thu July 26. 14:30SimpkinsLee Rm Plasma Seminar (organised by FELIX) John Wright (MIT) --- From Core to Edge: a new approach to RF modeling John Wright (MIT) Thu   Aug 2 No seminar, Vienna meeting Thu Aug 9 11:30 Freeman Rm Plasma Group Meeting (organised by ALEX) Archie Bott & Michael Hardman --- Highlights and thoughts from the Vienna meeting Vienna slides and readings Bill Dorland (Maryland) Thu Aug 16 11:30 Freeman Rm Plasma Group Meeting (organised by ALEX) What is everyone up to? Free discussion. Thu Aug 23. 11:30 Freeman Rm Plasma Group Meeting (organised by MICHAEL) TBA Thu Aug 30. 11:30 Freeman Rm Plasma Group Meeting (organised by FELIX) TBA Mon Sept 3 11:30 Freeman Rm Plasma Seminar (organised by ALEX) Paolo Ricci (EPFL) --- New insights on scrape-off layer plasma turbulence One of the greatest uncertainties in the success of ITER and future fusion reactors is related to the turbulent dynamics of the fusion fuel in the scrape-off layer (SOL). The plasma behavior in this region governs the overall confinement of a tokamak, regulates the impurity dynamics and the level of fusion ashes, and determines the heat load to the tokamak vessel walls – a showstopper for the whole fusion program if material requirements cannot be met. With the goal of improving our understanding of plasma turbulence in the SOL, the GBS code has been developed in Lausanne during the past few years.  By solving the drift-reduced Braginskii equations coupled to a kinetic equation for the neutrals, GBS evolves self-consistently the SOL dynamics as it results from neutral recycling, turbulent transport, and plasma losses at the vessel. GBS simulations have led, for example, to the identification of the instabilities driving SOL turbulence and to a first-principles estimate of the turbulence saturation amplitude and of the SOL pressure scale length. We will present our simulation and theoretical results, as well as their comparison with experimental measurements from several tokamaks worldwide. JCP 351, 388 (2016) PoP 20, 010702 (2013) Paolo Ricci (EPFL) Thu Sept 6. 11:30 Paton Rm Plasma Group Meeting (organised by MICHAEL) Free discussion Thu Sept 13. 11:30 Paton Rm Plasma Group Meeting (organised by FELIX) Alessandro Geraldini & Michael Hardman --- Report on the Varenna meeting Thu Sept 20 No seminar, Madrid meeting

Michaelmas Term of 2018