PSFC Seminars

All Seminars are on Friday at 3pm, unless otherwise noted.
NW17-218, 175 Albany Street, Cambridge
For further information: info@psfc.mit.edu

Apr 12, 2019

Observable consequences of saturation by stable modes

Paul Terry

University of Wisconsin-Madison

This talk will examine the growing list of observable consequences of the saturation of ion temperature gradient turbulence by stable modes.  These include the wavenumber spectrum of ITG turbulence, the scaling of its turbulence level with zonal flow damping rate, and the rate of heat flux decrease with beta in gyrokinetic simulations.

3:00pm  |  NW17-218  |  Add to CalendarApple CalendarGoogleOutlookYahoo

Apr 26, 2019

Role of reconnection in magnetic plasma turbulence

Stanislav Boldyrev

University of Wisconsin-Madison

Numerical simulations, observations, and analytic models suggest that strong magnetic plasma turbulence forms anisotropic sheared magnetic structures that are not necessarily associated with energy dissipation, rather, they appear in a broad range of scales. We argue that given large enough Reynolds number of turbulence, such magnetic structures may become unstable to the tearing modes thus initiating processes of magnetic reconnection.

3:00pm  |  NW17-218  |  Add to CalendarApple CalendarGoogleOutlookYahoo

Past Events

Feb 8, 2019

Measurement of RF electric fields relevant for heating and current drive

Elijah Martin

Oak Ridge National Laboratory

In this seminar, the diagnostic and associated experimental results obtained from an RF sheath test stand (IC), Tore Supra (LH) and Alcator C-Mod (LH) will be presented.  Future diagnostic plans for the RF sheath test stand (IC), WEST (LH) and DIII-D (LH and EC) will be discussed.

3:00pm  |  NW17-218

Sep 28, 2018

High-field tokamaks: From Alcator to ARC

Bob Mumgaard

Commonwealth Fusion Systems

The seminar will trace the history of the high-field approach from its inception to its hiatus and its revival via HTS superconductors. We'll examine the various limitations of high-field copper and HTS magnets and the characteristics of high-field tokamaks as a class evolving from the invention of tokamaks to today.  Then we'll look forward to explore the high-field tokamak power plants based on the ARC-concept as a class.  We'll compare and contrast the attributes of these ARC-like power plants with their ITER-like or ARIES-like counterparts. 

3:00pm

Sep 21, 2018

Building an open source Python software ecosystem for plasma physics

Nick Murphy

Harvard-Smithsonian Center for Astrophysics

In this talk, Nick Murphy will describe modern best practices for scientific computing that we are adopting in PlasmaPy [2], present PlasmaPy’s current and planned capabilities, and discuss how our community can work together to forge an open source software ecosystem in coming years.

3:00pm  |  NW17-218

Sep 19, 2018

Supporting stockpile stewardship with high-energy-density physics experiments

Alan Wan

Lawrence Livermore National Laboratory

This presentation summarizes the range of High-Energy-Density (HED) physics experiments that deliver data meeting the mission requirements for stockpile-stewardship-relevant physics issues in regime otherwise inaccessible with other facilities.  Key HED physics topics range from material properties at high-pressure and temperatures, to radiation transport and radiation hydrodynamics.

11:00am  |  NW17-218

Sep 14, 2018

CRF physics studies using the Large Plasma Device

Troy Carter

UCLA

An experimental campaign on the physics of ICRF waves has recently begun using the Large Plasma Device (LAPD) at UCLA. A new high-power (∼150 kW) RF system and antenna have been developed for excitation of large amplitude fast waves in LAPD. The source runs at a frequency of 1-5 MHz, corresponding to ∼1-10 fci, depending on plasma parameters. Recent work has focused on the structure and scaling of RF sheaths and convection cells near the antenna.

3:00pm  |  NW17-218

Jun 14, 2018

Collisionless plasma shocks: properties, interests and similarities to fluid shocks

Antoine Bret

Universidad de Castilla-La Mancha

A neutral fluid can sustain shockwaves where dissipation at the shock front is provided by binary collisions. In a plasma, collective effects can equally provide dissipation so that shockwaves can develop over length scales much shorter than the mean free path. Such shocks have been dubbed “collisionless shock”. After reviewing the mechanism of their formation, we will explain why they have been attracting so much attention in recent years. Finally, we will comment on the similarities and differences their offer with respect to fluid shocks.

3:00pm  |  NW17-218

May 16, 2018

Tour of Resynthesizer and C-Mod

Hear Alcator C-Mod data become a mysterious soundscape on a tour of the resynthesizer and Alcator C-Mod. Learn more and register here.

May 9, 16, 23, 30, June 6  |  NW21

May 11, 2018

Unusual effects in rotating plasma

Nat Fisch

Princeton University

Rotating plasma can exhibit certain unusual effects, both in providing confinement and in affecting particle transport. These effects can be exploited in a variety of plasma devices, including Hall thrusters, plasma mass filters, and fusion confinement devices.  In pulsed devices, rotating plasma can exhibit unusual heat capacity effects.  A promising but highly speculative possibility is to exploit rotation to achieve magnetic confinement in a plasma torus, replacing in part the toroidal electron current.

3:00pm  |  NW17-218

May 4, 2018

Multi-scale turbulence in the core of tokamak plasmas

Nathan Howard

MIT

This talk will present an overview of recent multi-scale gyrokinetic simulations of Alcator C-Mod L and H-mode discharges and will discuss the status of multi-scale investigations from around the world.

3:00pm  |  NW17-218

Apr 27, 2018

New insights on scrape-off layer plasma turbulence

Paolo Ricci

École Polytechnique Fédérale de Lausanne

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. Prof. Ricci will present simulation and theoretical results, and compare them with experimental measurements from several tokamaks worldwide.

3:00pm  |  NW17-218

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