skip to main content

SciTech ConnectSciTech Connect

Title: Advanced Klystrons for High Efficiency Accelerator Systems - Final Report

This program explored tailoring of RF pulses used to drive accelerator cavities. Simulations indicated that properly shaping the pulse risetime to match accelerator cavity characteristics reduced reflected power and increased total efficiency. Tailoring the pulse requires a high power, gridded, klystron to shape the risetime while also controlling the beam current. The Phase I program generated a preliminary design of a gridded electron gun for a klystron producing 5-10 MW of RF power. This required design of a segmented cathode using Controlled Porosity Reservoir cathodes to limit power deposition on the grid. The program was successful in computationally designing a gun producing a high quality electron beam with grid control. Additional analysis of pulse tailoring indicated that technique would only be useful for cavity drive pulses that were less than approximately 2-3 times the risetime. Otherwise, the efficiency gained during the risetime of the pulse became insignificant when considering the efficiency over the entire pulse. Consequently, it was determined that a Phase II program would not provide sufficient return to justify the cost. Never the less, other applications for a high power gridded gun are currently being pursued. This klystron, for example, would facilitate development inverse Comptom x-ray sources bymore » providing a high repetition rate (10 -100 kHz) RF source.« less
Publication Date:
OSTI Identifier:
Report Number(s):
Final Report
DOE Contract Number:
Resource Type:
Technical Report
Research Org:
Calabazas Creek Research, Inc.
Sponsoring Org:
USDOE; USDOE Office of Science (SC); USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Orgs:
SLAC National Accelerator Laboratory
Country of Publication:
United States
43 PARTICLE ACCELERATORS RF source, klystron, accelerator, collider, x-ray source, light source