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An improvement to the global software standard for analyzing fusion plasmas
by Staff Writers
Princeton NJ (SPX) Apr 29, 2015


Schematic of NSTX tokamak at PPPL with a cross-section showing perturbations of the plasma profiles caused by instabilities. Without instabilities, energetic particles would follow closed trajectories and stay confined inside the plasma (blue orbit). With instabilities, trajectories can be modified and some particles may eventually be pushed out of the plasma boundary and lost (red orbit). Image by Mario Podesta.

The gold standard for analyzing the behavior of fusion plasmas may have just gotten better. Mario Podesta, a staff physicist at the U.S. Department of Energy's Princeton Plasma Physics Laboratory (PPPL), has updated the worldwide computer program known as TRANSP to better simulate the interaction between energetic particles and instabilities - disturbances in plasma that can halt fusion reactions.

The program's updates, reported this week in the journal Nuclear Fusion, could lead to improved capability for predicting the effects of some types of instabilities in future facilities such as ITER, the international experiment under construction in France to demonstrate the feasibility of fusion power.

Podesta and co-authors saw a need for better modeling techniques when they noticed that while TRANSP could accurately simulate an entire plasma discharge, the code wasn't able to represent properly the interaction between energetic particles and instabilities. The reason was that TRANSP, which PPPL developed and has regularly updated, treated all fast-moving particles within the plasma the same way. Those instabilities, however, can affect different parts of the plasma in different ways through so-called "resonant processes."

The authors first figured out how to condense information from other codes that do model the interaction accurately - albeit over short time periods - so that TRANSP could incorporate that information into its simulations. Podesta then teamed up with TRANSP developer Marina Gorelenkova at PPPL to update a TRANSP module called NUBEAM to enable it to make sense of this condensed data.

"Once validated, the updated module will provide a better and more accurate way to compute the transport of energetic particles," said Podesta. "Having a more accurate description of the particle interactions with instabilities can improve the fidelity of the program's simulations."

Fast-moving particles, which result from neutral beam injection into tokamak plasmas, cause the instabilities that the updated code models. These particles begin their lives with a neutral charge but turn into negatively charged electrons and positively charged ions - or atomic nuclei - inside the plasma. This scheme is used to heat the plasma and to drive part of the electric current that completes the magnetic field confining the plasma.

The improved simulation tool may have applications for ITER, which will use fusion end-products called alpha particles to sustain high plasma temperatures. But just like the neutral beam particles in current-day-tokamaks, alpha particles could cause instabilities that degrade the yield of fusion reactions. "In present research devices, only very few, if any, alpha particles are generated," said Podesta.

"So we have to study and understand the effects of energetic ions from neutral beam injectors as a proxy for what will happen in future fusion reactors."


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