SEM FE Probe Surface Science Study L. Laurent, S. Tantawi, R. Kirby *This research is funded by the SLAC LDRD Program. Modify Existing Scanning Electron Microscope (SEM). *Laboratory Directed Research and Development. SEM FE Probe Surface Science Study Overview
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L. Laurent, S. Tantawi, R. Kirby
*This research is funded by the SLAC LDRD Program
Modify Existing Scanning Electron Microscope (SEM)
*Laboratory Directed Research and Development
The performance of cathodes is highly dependent by the physics and chemistry taking place on the surface. The FE SEM system will be used to identify possible causes of non-uniform cathode emission.
SSRL Dispenser Cathode
The current probe will provide diagnostic support to help understand emission physics and in advancing next generation photocathode high brightness beams. We will use the current probe system to find features that may be responsible for breakdown.
LCLS Photocathode Inside SLAC SEM vacuum Chamber
HIP Cu - KEK
High Gradient Research
-- Materials --
TiN Coated Cu - KEK
Moly Plated Cu - Frascatti
-- Surface Finish --
Design and develop an electron microscope-based high-electric-field current-emission probe to study topographic material features and their impact on cathodes and high gradient structures.
Evaluate planar test samples in order to calibrate and optimize the system.
3. Work with non-planar geometries using existing components.
4. Perform iterative analysis on pre and post tested components (e.g. cathodes and
high gradient structures).
SLAC SEM is reaching end of life status. The goal is to optimize the system in SLAC’s current SEM and than move the system to a new SEM in the future when funding is available.
New SEM was approved in 2010 but purchase requisition was halted days before order was placed due to budget being on continuing resolution.
New RFP is being submitted within the month and we are hopeful that this one will go through and to have the new SEM before the end of this fiscal year (September 2011).
Present day SEM’s have significantly better capabilities and resolution than SLAC’s current SEM.