Seminar regular day & time: Thursday 10:45am in T169, refreshments @ 10:30am
Please contact Fatima Ebrahimi if you would like to give a seminar, suggest a speaker or would like to be notified of seminars by email.
Please note: All visitor must have their PPPL employee host notify the Site Protection Division of any visitors to PPPL. Please contact the seminar coordinator Fatima Ebrahimi or the department adminsitrator Jennifer Jones for entrance to the laboratory.
Future seminars are subject to changes due to speakers availability. Local, flexible speakers may be asked to reschedule their seminars to give guests an opportunity to deliver talks.
SEE BELOW FOR DATES & TIMES OF UPCOMMING AND DETAILS ON PAST SEMINARS
***************************************************************************************************************
Thursday, May 9, 2013
10:45 AM, in T169 Theory Seminar Room
Speaker: Mike Mauel , Colombia University
Title:TBA
***************************************************************************************************************
Thursday, May 2, 2013
10:45 AM, in T169 Theory Seminar Room
Speaker: Peter Damiano (PPPL)
Title: Electron acceleration in Alfvenic Aurora
***************************************************************************************************************
Friday, April 19, 2013 *** SPECIAL DAY***
10:45 AM, in T169 Theory Seminar Room
Speaker: Joaquim Loizu (Switzerland)
Title: The role of the sheath in the magnetized plasma fluid turbulence
***************************************************************************************************************
Thursday, March 14, 2013
10:45 AM, in T169 Theory Seminar Room
Speaker: D. del-Castillo-Negrete, Oak Ridge National Laboratory
Title: "Nonlocal models of non-diffusive transport"
There is experimental, numerical, and theoretical evidence of the limited applicability of the standard diffusive transport paradigm. In this seminar we discuss a framework for the construction of effective non-local models of non-diffusive transport, and apply the resulting models to problems of interest to magnetically confined fusion plasmas. We begin by discussing signatures of non-diffusive behavior in numerical and experimental data. Following this, we present the statistical foundations of the models in the context of non-Gaussian (Levy type) and non-Markovian stochastic processes, and discuss numerical methods for the solution of non-local transport equations in one and two dimensions. We then discuss several applications of the models including: (i) non-diffusive Lagrangian transport in plasma turbulence; (ii) anomalous confinement time scaling, profile peaking, and up-hill transport; (iii) non-local transport in the presence of internal transport barriers; and (iv) modeling of non-local perturbative experiments in JET and LHD.
***************************************************************************************************************
Thursday, January 10th
10:45 AM, in T169 Theory Seminar Room
Speaker: Dr. Will Fox, University of New Hampshire
Title:Magnetic reconnection and laboratory astrophysics experiments with laser-produced plasmas
Magnetic reconnection has recently been observed and studied in high-energy-density, laser-produced plasmas. These experiments are interesting both for obtaining new data on reconnection, and may also be relevant for inertial fusion, as this "magnetic reconnection" geometry, with multiple, colliding, magnetized plasma bubbles, occurs naturally inside ICF hohlraums. I will present results from our simulation effort modeling previous magnetic reconnection experiments, and present results from set of new experiments that we have initiated on the OMEGA EP facility at the University of Rochester Lab for Laser Energetics (LLE). In these new experiments the seed magnetic field is generated by pulsing current through a pair of external foils using the MIFEDS current generator (Magneto-Inertial Fusion Electrical Discharge System) developed at LLE, allowing experiments with either a "reconnection" geometry with anti-parallel fields or "null" geometry with a collision between nominally unmagnetized plasma.
**************************************************************************************************************
Thursday, January 3, 2013
10:45 AM, in T169 Theory Seminar Room
Speaker: Dr. Robert Leamon
Title: On the modulation of the solar activity cycles
We address the origin of the 11-year (quasi-)periodicity of the sunspot cycle by tying it to the significant temporal overlap of activity bands belonging to the 22-year magnetic activity cycle. Using a systematic analysis of ubiquitous coronal brightpoints, and the prevalent magnetic scale on which they form, we are able to observationally demonstrate the entirety of the 22-year magnetic activity cycle. The phases of the sunspot cycle occur as landmarks in the interaction and evolution of the overlapping activity bands in each hemisphere. The work presented establishes significant observational constraints for models of the origins of solar magnetic activity and will, as a result, improve our understanding of the structure of the heliosphere and the modulation of our star¹s radiative and particulate output.
