Continuous Wave Thermionic Copper RF Gun for Compact FELs

Award Information
Agency: Department of Energy
Branch: N/A
Contract: DE-FG02-12ER90258
Agency Tracking Number: 98800
Amount: $150,000.00
Phase: Phase I
Program: SBIR
Awards Year: 2012
Solicitation Year: 2012
Solicitation Topic Code: 10 d
Solicitation Number: DE-FOA-0000577
Small Business Information
1012 N. Walnut St., Lansing, MI, -
DUNS: 621290001
HUBZone Owned: Y
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Terry Grimm
 (517) 775-4436
Business Contact
 Jerry Hollister
Title: Dr.
Phone: (517) 230-7417
Research Institution
Compact free electron lasers (FELs) based on superconducting energy recovery linacs are poised to open a new market of tunable high power lasers. The primary impediment to realizing these FELs is an affordable electron source that operates continuous wave (CW) with moderate average current, moderate beam brightness and moderate peak current, and does not contaminate the superconducting linac. This SBIR will develop an electron source based on a thermionic cathode that is immersed in a copper radio frequency (RF) structure that accelerates and bunches the electron beam. The copper accelerating structure will operate in CW mode at 300-700 MHz and generate a 50-100 keV electron beam to match into the superconducting linac. Average beam currents of about 10 mA with peak current in the bunches at the undulator of about 5 A are required. The thermionic cathode will be a standard barium dispenser with average current densities up to 10 A/cm2, or a cerium/lanthanum hexaboride crystal for improved cleanliness, ultrahigh vacuum and higher current densities up to 100 A/cm2. The beam brightness from a thermionic copper RF gun would be adequate for terahertz and infrared FELs. High electric fields at the cathode with two or more harmonic frequencies will produce a low emittance beam in both the longitudinal and transverse direction with minimal electron back bombardment. A collimator and low energy buncher chicane will prepare the beam for injection into the superconducting energy recovery linac. The bunch length can be further compressed after the 5-10 MeV superconducting linac

* Information listed above is at the time of submission. *

Agency Micro-sites

SBA logo
Department of Agriculture logo
Department of Commerce logo
Department of Defense logo
Department of Education logo
Department of Energy logo
Department of Health and Human Services logo
Department of Homeland Security logo
Department of Transportation logo
Environmental Protection Agency logo
National Aeronautics and Space Administration logo
National Science Foundation logo
US Flag An Official Website of the United States Government