RFQ Lens for LEBT Applications
Abstract
The U.S. Army Strategic Defense Command (USASDC) solicited proposals for new and innovative particle beam technologies which are relevant to the Neutral Particle Beam (NPB) Program. Since high brightness beams are required for NPB and beam emittance, in large part, is determined by the ion source and low energy matching section, innovations to improve the quality or efficiency of the low energy beam transport (LEBT) are important. Some preliminary studies on radio frequency quadrupole (RFQ) lenses indicated that such lenses could be developed with improved capabilities for preparing ion beams for injection into RFQ linacs. These improved capabilities derive from the fact that the focusing effect is inversely proportional to the square of the frequency so stronger focusing can be achieved if the frequency in the RFQ lens is less than that of the RFQ linac. The goal of this project is to design, build, and test an RFQ lens that demonstrates the possibility of decoupling the phase and frequency of the RFQ lens from that of the RFQ linac into which it is focusing ions. The design of the lens was based on two-dimensional beam dynamics and RF cavity geometry analyses performed with the TRACE and SUPERFISH codes, respectively. The lens was then fabricated by a combination of SAIC and subcontracted machine shops. After fabrication, the lens was assembled for verification of resonant frequency, mode separation, tuning, and power conditioning, prior to beam tests.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 31, 1990
- Accession Number
- ADA227606
Entities
People
- D. A. Swenson
Organizations
- Leidos