Amorphous NEA Silicon Photocathodes-A Robust RF Gun Electron Source

Award Information
Agency: Department of Energy
Branch: N/A
Contract: DE-FG02-06ER84475
Agency Tracking Number: 80198S06-I
Amount: $100,000.00
Phase: Phase I
Program: SBIR
Awards Year: 2006
Solicitation Year: 2005
Solicitation Topic Code: 38
Solicitation Number: DE-FG01-05ER05-28
Small Business Information
Saxet Surface Science
3913 Todd Lane, Austin, TX, 78744
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Gregory Mulhollan
 Dr.
 (512) 462-3444
 Mulhollan@saxetsurfacescience.com
Business Contact
 Gregory Mulhollan
Title: Dr.
Phone: (512) 462-3444
Email: see comments
Research Institution
N/A
Abstract
In radio frequency (RF) guns with a thermionic cathode, electrons are free to leave the cathode at non-optimal phases of the RF field. These electrons can be accelerated backwards and impact the cathode. Such back-bombardment generates an additional heat load on the gun and cathode, which may limit the current available from the cathode. Consequently, thermionic cathode RF guns are not able to supply the high-phase-space densities required for the operation of a short-wavelength free energy laser (FEL). This project will investigate the use of negative-electron-affinity amorphous silicon as a photocathode suitable for RF gun systems. The advantages of amorphous silicon include a high degree of immunity to charged particle flux, low thermal emittance, bandgap tunability when grown in quantum dot form, and low production cost. In Phase I, measurements will be conducted on amorphous silicon to determine the activation procedure, photoresponse, and charged particle (in)sensitivity. Single crystal silicon will be used as a baseline and benchmark, against which the amorphous silicon activation procedure will be compared and contrasted. Commercial Applications And Other Benefits as described by the Applicant: Cw accelerators, such as energy recovery linacs, should find amorphous-silicon-based RF photoinjectors very inviting. Other potential applications include FELs, along with other uses that require the lowest possible source emittance. Finally, reliable, low-cost photocathode-driven RF gun systems could become ready replacements for the diode and triode guns used on medical accelerators for the production of clinical photon beams and therapy electron beams

* information listed above is at the time of submission.

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