The Office of Fusion Energy Science, part of the US Department of Energy, has awarded $1.05 million dollars to the HIDRA plasma/fusion facility for performing fusion-relevant materials science on lithium as a Plasma Facing Component (PFC). HIDRA is especially well-suited to materials testing thanks to its long shot durations and many ports that can be dedicated to materials experiments. Lithium is a promising PFC candidate for future fusion reactors, but performing lithium experiments in existing fusion devices, such as HT-7 in Hefei, China, can be difficult and time-consuming. With this grant, the first government grant HIDRA has received so far, lithium studies can be conducted in-house at the Center for Plasma Material Interactions, without the need to coordinate experiments with other research teams. Professor Daniel Andruczyk, head of HIDRA operations and creator of an undergraduate-level course which focuses on giving students hands-on experience with HIDRA, plans for HIDRA to become a user facility accessible by scientists both on and off campus, providing the first dedicated materials testbed for fusion science in the country.
On May 30 to June 3, the 22nd International Conference on Plasma Surface Interactions in Controlled Fusion Devices, presented by ENEA, the Italian National Agency for New Technologies, Energy and Sustainable Economic Development, was held in Rome Italy. CPMI sent Director Dr. David Ruzic and Graduate Student Michael Chrsitenson to present our latest research on fusion-relevant PSI. Professor Ruzic presented research on Flowing Liquid Lithium Plasma-Facing Components and Free Surface Stability of Liquid Metal Plasma Facing Components. Dr. Currelli, an affiliate faculty member of CPMI, presented research on the Analysis of Microscopic Erosion of a Beryllium Wall Exposed to a Helium Plasma Using a Boltzmann-BCA model. Affiliate faculty member Dr. J.P. Allain sent three of his graduate students, Felipe Bedoya, Aveek Kapat, and Anton Neff. Their presented research concerned deciphering deuterium retention in He-irradiated porous low Z-coated tungsten nanostructures, initial studies of PFC conditioning in the National Spherical Tokamak Experiment Upgrade with the Materials Analysis Particle Probe, and elucidating behavior of Li-based surfaces on W substrates under high-temperature and high-flux He plasmas in Pilot-PSI.
Gianluca Panici, a graduate student at CPMI, was just awarded the IBM Ph.D. Fellowship! The IBM Ph.D. Fellowship Awards Program attracts applicants from all over the world from fields as diverse as computer science and engineering to physical sciences and processing engineering. The Fellowship is awarded to only a select few Ph.D. candidates each year. Congratulations Gianluca!
The Center for Plasma-Material Interactions would like to officially welcome our newest post-doctoral research scientist, Dr. Sabrina Hammouti! Her expertise in laser systems and laser-surface interactions will be of vital importance to several exciting CPMI projects, including the Dry Etch Assisted by Laser (DEAL) project and much more. We look forward to having Sabrina on the team.
“In-Situ Collector Cleaning and EUV Reflectivity Restoration by Hydrogen Plasma for EUV Sources,” a paper by CPMI graduate students Daniel Elg and Gianluca Panici, has just been accepted for publication by the Journal of Vacuum Science and Technology A! Extreme Ultraviolet Lithography is the next step for the photolithography systems used to manufacture ever smaller computer chips. Their research concerns the use of an in-situ Hydrogen plasma to remove deposited Tin from the extremely sensitive reflectors used in EUV systems, allowing for significantly less downtime in the manufacturing process. After publication, a link to the paper will be added to the paper’s entry on the CPMI Publications page, where you can find links to download all published CPMI papers.
CPMI was intensely involved in last week’s Symposium on Fusion Engineering (SOFE) held this year in Austin, Texas. Chaired by CPMI’s own Dr. Jean Paul Allain, SOFE is the prime fusion energy engineering conference. Professors Dr. Daniel Andruczyk and Dr. Davide Curreli started out the week by organizing and, along with CPMI Director Dr. David Ruzic, contributing to a short course on Plasma Material Interactions for Fusion Plasma Applications. Dr. Ruzic’s lecture for the short course was Plasma Facing Materials in Fusion. Dr. Andruczyk gave two lectures, titled Fundamentals of Plasma Material Interactions and Diagnostics for Plasma Material Interactions, while Dr. Curreli’s two lectures were titled The Plasma Sheath and Computational Plasma Material Interactions 1: Plasma Edge Models.
In addition to the short course, Dr. David Ruzic gave an invited talk titled Design of LiMIT Type Test Module as a Limiter. Dr. Andruczyk presented the status of and progress made on the Hybrid Illinois Device for Research Applications (HIDRA) and gave a second, invited talk on HIDRA and the Materials Challenges for Stellarators. Graduate students Matthew Szott and Peter Fiflis gave talks on wetting of nanostructured surfaces by liquid lithium and tin & the time-resolved observation of tungsten nanostructuring due to helium plasma respectively.
Felipe Bedoya and Anton Neff, two more graduate students, presented posters at the conference. Felipe’s poster was about the Materials Analysis Particle Probe (MAPP) upgrade and its integration into the National Spherical Torus Experiment (NSTX-U) and Anton displayed a poster titled Defect Dynamics of Ultra-Refined Tungsten under Helium Bombardment. Also in attendance were CPMI postdoctoral research scientist Kishor Kalathiparambil and graduate students Mike Christenson and Jon Drobny.
Conferences such as SOFE are an essential and exciting part of CPMI’s role in participating in the global research community and continuing to conduct cutting edge science. In addition to the mutual exchange of knowledge and experience characteristic of every good scientific conference, CPMI’s involvement in the previous SOFE in 2013 led directly to our acquisition of HIDRA (formerly WEGA) – what will result from this year’s SOFE remains to be seen.
The Hybrid Illinois Device for Research and Applications (HIDRA) is slowly but surely coming together! HIDRA is a medium-sized fusion device that will be used primarily as a materials testbed for fusion research. CPMI students and faculty have been hard at work assembling HIDRA and its supporting infrastructure, bringing us ever closer to striking first plasma. Take a look at the time-lapse below to see how far we’ve come:
See if you can spot the small hydra statue kept in view of the time-lapse camera during assembly!
As part of the Plasma Surface Interactions: Bridging from the Surface to the Micron Frontier through Leadership Class Computing SciDAC project, we are working to better understand how plasma facing components (PFCs) will interact with burning fusion plasmas. Researchers at CPMI are investigating processes like sputtering, re-deposition, and evolving surface roughness with Monte Carlo, binary collision approximation (BCA) codes. We have designed and developed several surface roughness models for TRIDYN (resulting in the Fractal TRIDYN code, or FTRIDYN) and are using these to investigate the role surface roughness plays in ballistic ion-surface interactions.
Click to Enlarge: D on Be Sputtering Yield
W. Möller, W. Eckstein, J.P. Biersack, Tridyn-binary collision simulation of atomic collisions and dynamic composition changes in solids, Computer Physics Communications, Volume 51, Issue 3, November 1988, Pages 355-368, ISSN 0010-4655, 10.1016/0010-4655(88)90148-8. http://www.sciencedirect.com/science/article/pii/0010465588901488
D.N. Ruzic and H.K. Chiu, J. Nucl. Mater. 162-164 (1989) 904.
R.P. Doerner, D. Nishijima, T. Schwarz-Selinger, Nucl. Fusion 52 (2012) 103003