News

Interesting results from ECAPS.

April 11, 2014

Alumina sheet being exposed to 2 kV argon z-pinch. The energetic species generate nano dimensioned structures on the surface.

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CPMI Welcomes New Postdoc – Kishor Kalathiparambil

December 19, 2013

CPMI would like to officially welcome an additional Postdoc, Kishor Kalathiparambil, who has come to work at CPMI after receiving his Ph.D. from the Institute of Plasma Research from Gandhinagar India. CPMI looks forward to having Kishor on the team.

CPMI Welcomes New Postdoc – Ivan Shchelkanov

October 11, 2013

CPMI would like to officially welcome it’s newest Postdoc, Ivan Shchelkanov, who has come to work at CPMI after receiving his Ph.D. from Moscow Engineering Physical University. CPMI looks forward to working and benefiting from Ivan’s experience.

CPMI Welcomes Jean Paul Allain as New Professor and Associate Director of CPMI

August 7, 2013

CPMI and NPRE welcome new Professor Jean Paul Allain to the University of Illinois at Urbana-Champaign. Additionally, Professor Allain is also a Associate Director of CPMI. Professor Allain previously taught at Purdue University and received his PhD from the University of Illinois at Urbana-Champaign were he was a student under and a postdoc for Professor David Ruzic.

Davide Curreli Appointed as Assistant Director of CPMI

August 7, 2013

CPMI’s own postdoc, Davide Curreli, has be selected to be one of the new plasma professors at the University of Illinois at Urbana-Champaign. His new position has brought him also the position of being an Assistant Director for the Center for Plasma and Material Interactions.

Congratulations Davide!

CPMI Hires New Postdoc – Kishor Kalathiparambil

August 7, 2013

After going through a series of highly qualified applicants, CPMI has selected Kishor Kalathiparambil as a post doc. Kishor has worked around the world looking in various aspects of plasma material related fields and received his PhD in May of 2012 from the Institute of Plasma Research from Gandhinagar India.

Congratulations Kishor!

Plasma Surface Interactions – Scientific Discovery through Advanced Computing (PSI-DAC)

June 26, 2013

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.

    Enlarge Image of Sputtering Yield of Deuterium Incident on Beryllium

Click to Enlarge: D on Be Sputtering Yield

TRIDYN:
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

Fractal TRIM:
D.N. Ruzic and H.K. Chiu, J. Nucl. Mater. 162-164 (1989) 904.

Experiment:
R.P. Doerner, D. Nishijima, T. Schwarz-Selinger, Nucl. Fusion 52 (2012) 103003

(Updated 2015)

Lithium Injector

June 26, 2013

Study of liquid lithium has increased as of late for its applicability in fusion energy. Liquid lithium implemented in the divertor of a fusion device may prove to be the path to a fusion device that produces significantly more energy than it consumes. Liquid lithium benefits a fusion device by gettering cold hydrogenic species at the wall of a fusion device, raising edge temperatures, and increasing energy confinement times. However, this effect subsides as the lithium passivates, or reacts to form different compounds. Maintenance of a clean lithium surface therefore is important, and so is the study of clean lithium surfaces.

The lithium injector developed at UIUC imparts the ability to place controlled amounts of visibly impurity-free liquid lithium into a vacuum chamber. Loaded with lithium that may be partially oxidized on the surface, ejection through a nozzle ensures via the high surface tension of lithium that the oxide, hydroxide, and hydride impurities that form on lithium surfaces are confined to the injector tube, and that only lithium exits. This injector is used in the Materials Characterization Test Stand (MCATS) chamber to study the contact angle of liquid lithium, as well as used to fill the Liquid-Metal Infused Trenches (LiMIT) that are implemented on the Solid-Liquid Lithium Divertor Experiment (SLiDE) chamber with clean lithium.

(Updated 2013)

MCATS – Materials Characterization Test Stand

June 26, 2013

Liquid metals have received increased attention within the fusion community as of late. Liquid lithium, especially, has been the target of much interest for its ability to getter impurities and cold hydrogenic species at the walls of fusion devices. Lithium has been shown in several fusion devices to increase energy confinement times and to reduce the frequency of edge localized modes, plasma instabilities which cause large deposits of energy to the first wall of fusion devices. Inclusion of liquid metals in a fusion device requires, however, that the liquid metal wet the substrate on which it is placed. Beading of the liquid is undesirable.

The Materials Characterization Test Stand (MCATS) chamber at CPMI was specifically designed to investigate the wetting phenomena of liquid metals on various fusion relevant substrates. A moveable stage mounted either on a plate heater, or with strip heaters attached to the back side allows for placement of several droplets of liquid metal on various surfaces, in order to study the contact angle of a liquid metal on the surface. Contact angles of liquid lithium on various fusion relevant surfaces have been studied, as well as methods for the reduction of the critical wetting temperature of lithium on these surfaces.

MCATS also allows for the study of the compatibility of liquid metals with various solid surfaces. A pool of liquid metal in a stainless steel cup is mounted on the stage. A rotary motion feedthrough driven by an external motor allows for study of erosion of different solid materials in liquid metal. Most recently, this device showed the strong attack of copper by liquid gallium.

(Updated 2013)