Final Report for "Design calculations for high-space-charge beam-to-RF conversion".

Technical Report · Fri Oct 17 00:00:00 EDT 2008

DOI:https://doi.org/10.2172/939618· OSTI ID:939618

Smithe, David N

Accelerator facility upgrades, new accelerator applications, and future design efforts are leading to novel klystron and IOT device concepts, including multiple beam, high-order mode operation, and new geometry configurations of old concepts. At the same time, a new simulation capability, based upon finite-difference “cut-cell” boundaries, has emerged and is transforming the existing modeling and design capability with unparalleled realism, greater flexibility, and improved accuracy. This same new technology can also be brought to bear on a difficult-to-study aspect of the energy recovery linac (ERL), namely the accurate modeling of the exit beam, and design of the beam dump for optimum energy efficiency. We have developed new capability for design calculations and modeling of a broad class of devices which convert bunched beam kinetic energy to RF energy, including RF sources, as for example, klystrons, gyro-klystrons, IOT's, TWT’s, and other devices in which space-charge effects are important. Recent advances in geometry representation now permits very accurate representation of the curved metallic surfaces common to RF sources, resulting in unprecedented simulation accuracy. In the Phase I work, we evaluated and demonstrated the capabilities of the new geometry representation technology as applied to modeling and design of output cavity components of klystron, IOT's, and energy recovery srf cavities. We identified and prioritized which aspects of the design study process to pursue and improve in Phase II. The development and use of the new accurate geometry modeling technology on RF sources for DOE accelerators will help spark a new generational modeling and design capability, free from many of the constraints and inaccuracy associated with the previous generation of “stair-step” geometry modeling tools. This new capability is ultimately expected to impact all fields with high power RF sources, including DOE fusion research, communications, radar and other defense applications.

• Research Organization: Tech-X Corporation, Boulder, CO (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: FG02-06ER84507
• OSTI ID: 939618
• Report Number(s): Final Report; 7087; TRN: US1001943
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATORS
ACCURACY
BEAM DUMPS
CAVITIES
COMMUNICATIONS
DESIGN
ENERGY EFFICIENCY
ENERGY RECOVERY
FLEXIBILITY
GEOMETRY
KINETIC ENERGY
KLYSTRONS
LINEAR ACCELERATORS
RADAR
SIMULATION
SPACE CHARGE
Accelerators
Energy Recovering Linac
RF Sources
RF Devices
Klystron
IOT
Modeling
Design.