Open AccessReport on Design, Development, and Characterization of a Coaxial Resonator Based Single-gap Gridless Multiharmonic Buncher
Author(s) -
Edvard Pozdeyev,
John Brandon,
Nathan Bultman,
Xuni Rao,
R. C. York,
Qing Zhao
Publication year - 2013
Language(s) - English
Resource type - Reports
DOI - 10.2172/1073065
Subject(s) - thermal emittance , beam (structure) , resonator , harmonics , voltage , physics , ion beam , acceleration voltage , radio frequency , electrical engineering , optics , nuclear physics , engineering , cathode ray , quantum mechanics , electron
The design of the multiharmonic buncher is determined by Facility for Rare Isotope Beam (FRIB) requirements. The buncher will bunch stable ion beams for injection into the FRIB RFQ to minimize the longitudinal beam emittance growth. The design beam energy is fixed at 12 keV/u while the beam charge state Q/A can vary from 1/3 to 1/7. The buncher operates at a fundamental frequency of 40.25 MHz. Two higher harmonics, 80.5 MHz and 120.75 MHz are used to linearize the voltage ramp. The typical accelerating voltage for a uranium beam, including the time-of-flight factor, is 1271 V, 456 V, and 150 V for 40.25 MHz, 80.5 MHz, and 120.75 MHz harmonics respectively. The voltage will be scaled with the charge state of an accelerated beam. The accelerated electrical beam current is expected to be approximately equal to 0.5 mA for all ion beams between oxygen and uranium