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CLASSE Seminar: Dr. Henri Lee, Pohang Accelerator Lab, Korea

Thursday, March 16, 2017 at 1:00pm

Wilson Synchrotron Lab, 3rd Floor Commons

Can we make reliable capillary optics?

Abstract: CHESS is a leader in mono bounce capillary optic since CHESS has been developing it and its technology more than 10 years. CHESS capillaries mostly have rotationally symmetric ellipsoidal shape and this is suitable focusing optic for current CHESS beamlines to deliver x-ray beam into 10~50um spot size due to its large intercepted beam area.

As for CHESS-U and other 3rd Synchrotrons, both x-ray source size and emittance are getting smaller, a great leap in capillary technology is on demand to meet their purpose. Desirable capillaries should provide smaller focused beam size and/or extended x-ray energy regime To realize these properties, Micron-scale Controlled Capillary (MC2-cap1), Metal Coated Capillary (MC2-cap2), and both are inevitable.

The issue of MC2-cap1 is realizing a good capillary with high profile accuracy and overall straightness in micron scale. A process optimization for single pulling (making) process is surely possible but it is more like a master craftsman’s work. On the other hand, to realize this MC2-cap1 in general, multiple modification and measurement (figure) could be introduced to meet each parametric tolerance.

The aim of metal coated capillary, of MC2-cap2 is to extend available x-ray energy regime higher than 30keV or to enhance gain efficiency by increasing intercepted beam area. For these purposes, increasing critical energy of x-ray reflectivity is essential by proper thin layer coating. High-Z metal or its compound are desirable and Platinum can be a typical candidate.

In addition, I’ll briefly summarize my work in CHESS during my sabbatical and discuss possible collaborations.

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Event Type

Seminar

Departments

CHESS, CLASSE

Tags

x-ray, xray, synchrotron, synchotron, crystallography

Website

http://jclub.chess.cornell.edu/

Contact E-Mail

kd73@cornell.edu

Contact Name

Kathy Dedrick

Contact Phone

607 255-7163

Speaker

Dr. Henri Lee

Speaker Affiliation

Pohang Accelerator Lab

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