| 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 |
| 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 |
11:30 Paton 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 |
11:30 Paton 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 |
11:30 Paton 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 |
11:30 Paton Rm |
Plasma
Group Meeting (organised
by ALEX) Plamen Ivanov and Valerian Chen --- report on the EPS Plasma Conference |
|||
| Thu July 26. |
14:30 Simpkins Lee 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 |
||||