Field characteristics of an alvarez-type linac structure having chain-like electrode array

Conference · Tue Oct 01 04:00:00 EDT 1985 · IEEE Trans. Nucl. Sci.; (United States)

OSTI ID:6298154

Odera, M; Goto, A; Hemmi, M

A chain-like electrode configuration in an Alvarez-type linac cavity was studied by models. The structure has been devised to get a moderate shunt impedance together with simplicity of operation, in ion velocity region of more than a few percent of that of light by incorporating focusing scheme by high frequency quadrupolar fields into an TM-010 accelerating field of an Alvarez linac. It has a chain-like electrode array instead of drift tubes containing quadrupole lenses for ordinary linacs. The chain-like electrode structure generates along its central axis, high frequency acceleration and focusing fields alternately, separating the acceleration and focusing functions in space. The separation discriminates this structure from spatially uniform acceleration and focusing scheme of the RFQs devised by Kapchinsky and Teplyakov. It gives beam acceleration effects different from those by conventional linacs and reveals possibility of getting a high acceleration efficiency. Resonant frequency spectrum was found relatively simple by measurements on high frequency models. Separation of unwanted modes from the TM-010 acceleration mode is large; a few 10 MHz, at least. Tilt of the acceleration field is not very sensitive to pertubation in gap capacitance for the TM-010 mode.

• Research Organization: Inst. Phys. Chem. Research. (RIKEN), Saitama
• OSTI ID: 6298154
• Report Number(s): CONF-850504-
• Conference Information: Journal Name: IEEE Trans. Nucl. Sci.; (United States) Journal Volume: NS-32:5
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430303* -- Particle Accelerators-- Experimental Facilities & Equipment
ACCELERATION
ACCELERATORS
BEAM FOCUSING MAGNETS
BEAMS
CAVITY RESONATORS
CLOSED CONFIGURATIONS
ELECTRICAL EQUIPMENT
ELECTRODES
ELECTROMAGNETS
ELECTRONIC EQUIPMENT
EQUIPMENT
ION BEAMS
LINEAR ACCELERATORS
MAGNETIC FIELD CONFIGURATIONS
MAGNETS
MULTIPOLAR CONFIGURATIONS
PERFORMANCE
QUADRUPOLAR CONFIGURATIONS
RESONATORS