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 This is more or less right. Perhaps less. Alfred Mallet |
It is
better to be roughly right than precisely wrong. Maynard
Keynes 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 I have seen papers where the student wasn't the problem. Michael Hardman There has been a lot of fascinating work on this subject, most of it kind of boring. Philipp Kempski |
Wk | Date |
Time
& place |
Speaker & Topic |
Background reading |
Comings and goings (incl. visitors in town) |
0 |
Thu Apr 25 |
11:00 501 DWB |
Plasma Journal Club (organised
by JASON & PLAMEN) Universal modes: Mikhailovskii & Rudakov, Sov. Phys. JETP 17, 621 (1963); Krall & Rosenbluth, PoF 8, 1488 (1965) & the more recent development: Landreman, Plunk & Dorland, JPP 81, 905810501 (2015) |
||
I |
Thu May 2 |
11:00 501 DWB |
Plasma
Seminar (organised
by ALEX) Ilya Dodin (Princeton) --- Quantumlike modeling of drift-wave turbulence: recent updates |
JPP 85, 905850101 (2019) arXiv:1902.04970 arXiv:1902.06870 |
Ilya
Dodin (Princeton) |
Thu May 3 |
14:00 D Sciama LT |
Theoretical Physics Colloquium: Ilya Dodin (Princeton) --- Structure from turbulence, or why you might want to care about plasma physics even if you are not a plasma physicist Turbulence may appear as
impenetrably complicated when studied in terms of "low-level"
quantities such as the fluid velocity or the electrostatic potential.
However, it can be greatly simplified in variables that are more
abstract yet also more meaningful specifically as characteristics of
turbulence. In particular, the typical equations that emerge in
turbulence theory can be put in the same form as those that govern
nondegenerate quantum plasmas, which are easier to understand. I will
overview the basic idea of how to map turbulence equations to plasma
equations and how to keep them intuitive; in essence, using the Weyl
calculus is the key. I will also illustrate this idea with examples
from Rossby/drift-wave turbulence, which is ubiquitous in fluids and
plasmas. Similar applications to other types of turbulence are also
possible and anticipated.
|
|||
II |
Tue May 7 |
16:00 D Sciama LT |
Special
Astro/Plasma
Seminar: Mattia Sormani (ITA Heidelberg) --- Understanding the gas dynamics in the central 3 kpc of the Milky Way |
Bence
Kocsis (Eotvos Lorand U, Budapest) Mattia Sormani (ITA Heidelberg) |
|
Thu May 9 |
11:00 501 DWB |
Plasma Journal Club (organised
by TOBY) What you really want to know about G-transform but are afraid to ask: Heninger & Morrison, PoP 25, 082118 (2018) Morrison, Transport Theory & Stat. Phys. 29, 397 (2000) Morrison, PoP 1, 1447 (1994) |
|||
14:00 D Sciama LT |
Special
Astro/Plasma
Seminar: Bence Kocsis (Eotvos U, Budapest) --- Liquid crystals of stars and black holes at the centers of galaxies |
||||
III |
Thu May 16. |
11:00 501 DWB |
Plasma
Group Meeting (organised
by MICHAEL) Valerian Chen --- TBA |
||
IV |
Mon May 20 |
11:30 D Sciama LT |
Special
Astro/Plasma
Seminar: Jason Sanders (IoA Cambridge) --- Our multi-dimensional, time-evolving Galaxy |
J-B Fouvry (IAS Princeton) Jason Sanders (IoA Cambridge) Jono Squire (Otago) |
|
Thu May 23 |
11:00 D Sciama LT |
Plasma
Seminar & Special
Astro/Plasma
Seminar: Jean-Baptiste Fouvry (IAS Princeton) --- Resonant relaxation of stars around a supermassive black hole |
|||
V |
Tue May 28 |
11:00 D Sciama LT |
Special
Astro/Plasma
Seminar: Jono Squire (Otago) --- Resonant drag instabilities and the fluid dynamics of planet formation |
Jono Squire (Otago) |
|
Thu May 30. |
11:00 501 DWB |
Plasma
Group Meeting (organised
by FELIX) No fixed agenda, spontaneous contributions welcome |
|||
VI |
Thu June 6. |
11:00 501 DWB |
Plasma
Group Meeting (organised
by MICHAEL) No fixed agenda, spontaneous contributions welcome |
Francis Casson (UKAEA) |
|
VII |
Thu June 13 |
11:00 501 DWB |
Plasma
Seminar (organised
by ALEX) Ben McMillan (Warwick) --- The edge of chaos and simple advecting structures in gyrokinetic simulations |
PoP 16, 022310 (2009) FDR 46, 061403 (2014) JPP 84, 905840611 (2018) |
Francis Casson (UKAEA) Ben McMillan (Warwick) |
VIII |
Thu June 20 |
11:00 501 DWB |
Plasma Seminar (organised
by FELIX) Francis Casson (UKAEA) --- Predictive multi-channel flux-driven modelling to optimise tungsten control and fusion performance in JET |
Francis Casson (UKAEA) Bill Dorland (Maryland) |
|
9 |
Thu June 27 |
11:00 501 DWB |
Plasma Seminar (organised
by ALEX) Michael Nastac (Maryland) --- Fluctuation-dissipation relations for plasma-kinetic Langevin equations with toroidal geometry |
JPP 81, 305810104 (2014) |
Francis Casson (UKAEA) Bill Dorland, Michael Nastac (Maryland) Thomas Foster joins the group as summer intern Vincent d'Hebremont (Paristech) joins the group as MSc researcher |
10 |
Thu July 4. |
11:00 501 DWB |
Plasma
Group Meeting (organised
by FELIX) Felix Parra & Sarah Newton --- Some ideas for edge gyrokinetics |
Bill Dorland, Michael Nastac (Maryland) Robert Ewart joins the group as summer intern |
|
Wed July 10 |
11:00 J. Paton Rm |
Plasma Journal Club (organised
by JASON) "Stellarators with permanent magnets" by Helander et al.: arXiv:1907.01363 |
Bill Dorland, Michael Nastac (Maryland) |
||
Wed July 17 |
11:00 501 DWB |
Plasma Seminar (organised
by ALEX) Young-chul Ghim (KAIST) --- Nonlinear energy transfer of ELMs |
Bill Dorland, Michael Nastac (Maryland) Young-chul Ghim (KAIST) David Hatch (UT Austin) Romain Meyrand (LPP Paris) |
||
Tue July 23 |
11:00 501 DWB |
Plasma Seminar (organised
by ALEX) Chris Bambic (Cambridge) --- Powerful sound waves from AGN jets |
arXiv:1906.03272 |
Chris Bambic (Cambridge) Bill Dorland, Michael Nastac (Maryland) Yohei Kawazura (Tohoku U) Jens Rasmussen, Anders Nielsen (DTU, Copenhagen) Georgia Acton joins the group as summer intern |
|
Wed July 24 |
15:30 Simpkins Lee Rm, Beecroft |
Plasma Journal Club (organised
by MICHAEL HARDMAN) "Persistence of ITG turbulent transport at finite normalized pressure" by Ishizawa et al.: PRL 123, 025003 (2019) |
|||
Thu July 25 |
11:00 Simpkins Lee Rm, Beecroft |
Plasma Seminar (organised
by FELIX) Jens Juul Ramussen (DTU, Copenhagen) --- Investigations of transport properties and profiles in the scrape-off layer of magnetically confined plasmas---the HESEL code |
PoP 23, 032306 (2016) PPCF 58, 014031 (2016) PPCF 59, 025012 (2017) |
||
July 29 - Aug 9 |
Vienna Workshop |
||||
Thu Aug 1 |
No seminar |
Juan Ruiz Ruiz joins the group as postdoc |
|||
Thu Aug 8. |
No seminar |
||||
Thu Aug 15 |
11:00 501 DWB |
Plasma Seminar (organised
by ALEX) Juan Ruiz Ruiz (Oxford) --- Validation of gyrokinetic simulations in NSTX and comparisons with a synthetic diagnostic for high-k scattering ++some new/preliminary results on ion-scale turbulence and Dimits shift |
JRR's PhD Thesis |
Jan Siuta joins the group as summer intern; Denis St-Onge joins the group as postdoc |
|
Thu Aug 22 |
11:00 501 DWB |
Plasma Journal Club (organised
by JASON & PLAMEN) "Maximum-entropy states for magnetised ion transport" by Kolmes et al.: arXiv:1907.01519 |
|||
Fri Aug 30 |
11:00 501 DWB |
Plasma Seminar (organised
by FELIX) Gregor Birkenmeier (IPP, Garching) --- The magic of the transition to high confinement at ASDEX Upgrade |
Experimental background: NF 52, 012001 (2012) NF 54, 083003 (2014) |
Thomas Foster's internship ends |
|
Thu Sep 5 |
11:00 501 DWB |
Plasma Seminar (organised
by MICHAEL) Michail Tzanis (York) --- 3D variational MHD stability of tokamak plasmas: application to RMPs |
Jan Siuta's internship ends |
||
Thu Sep 12. |
11:00 501 DWB |
Plasma Tutorial (organised
by MICHAEL) Michael Barnes --- Tutorial on numerical methods I will give a fairly
basic introduction to numerical methods, focusing on a numerical
treatment of linear Landau damping. This will by no means be
comprehensive, as there’s not enough time for that even in our
seminars! Topics to be covered include explicit vs. implicit
time-stepping, grid-based vs spectral methods, and numerical
stability.
|
|||
Thu Sep 19. |
11:00 501 DWB |
Plasma
Group Meeting (organised
by FELIX) Toby Adkins --- The long-time behavior of electrostatic, collisionless plasmas: in search of universal collisionless equilibria (dry run for ETFC poster) |
JPP 84, 905840107 (2018) +slides available from author |
Robert Ewart's internship ends |
|
Thu Sep 26. |
11:00 501 DWB |
Plasma
Group Meeting (organised
by MICHAEL) Michael Hardman --- Update on ETG turbulence near marginal stability (and how it differs from ITG turbulence there) |
Georgia Acton's internship ends |