Abstract:INTRODUCTION 1 I. GENERAL DESCRIPTION 3 III. COORDINATE SYSTEM AND UNITS 4 IV. TRANSPORT-SYSTEM ELEMENTS 5 V. DYNAMICS CALCULATIONS 8 A. Elements Having Zero Length 9 B. Elements Having Constant Fields and No Energy Gain 9 C. Elements Causing Energy Change or Having Varying Fields 9 VI. TRANSFER MATRICES 9 A. Drift (ft) 10 B. Thin Lens (f , f , f) 10 x v z C. Quadripole
“…The TRACE 3-D program [6] is an envelope code that includes a first order space charge model. The code is a standard program used in the design of radiofrequency (RF) linacs and transport systems for high-current bunched beams.…”
Section: Electrostatic Deflector Model For Trace 3-dmentioning
“…The TRACE 3-D program [6] is an envelope code that includes a first order space charge model. The code is a standard program used in the design of radiofrequency (RF) linacs and transport systems for high-current bunched beams.…”
Section: Electrostatic Deflector Model For Trace 3-dmentioning
“…IMPACT [5] and a code developed at the NSCL [6] were used for beam dynamics studies in the superconducting linac section and HEBT. DIMAD [7] and TRACE3D [8] were used to study transverse focusing, beam matching, and the effect of misalignment and correction scheme in the superconducting linac section.…”
Rare Isotope Beams (RIBs) are created at the National Superconducting Cyclotron Laboratory (NSCL) by the in-flight particle fragmentation method. A novel system that stops the RIBs in helium gas and reaccelerates them is proposed to provide opportunities for an experimental program ranging from low energy Coulomb excitation to transfer reaction studies of astrophysical reactions. The beam from the gas stopper [1] will first be brought into a Electron Beam Ion Trap (EBIT) charge breeder [2] on a high voltage platform to increase its charge state, and then accelerated up to about 3 MeV/u by a system consisting of an external multi-harmonic buncher and a radio frequency quadrupole (RFQ) followed by a superconducting linac. The superconducting linac will use quarter-wave resonators with optimum acceleration for particle velocities as a fraction of the speed of light (β opt ) of 0.041 and 0.085 for acceleration and superconducting solenoid magnets for transverse focusing. The accelerator system design and the end-to-end beam dynamics simulations are presented.
We present the design of a Smith-Purcell radiation diagnostic to measure the micro bunch length of a 20MeV, 17 GHz electron bunch train. The bunch length can be determined by measuring the frequency and angular distribution of the emitted radiation as proposed by Nguyen [1]. The beam is produced by a 17 GHz, 50 MeV/m traveling wave (TW) accelerator built by Haimson Research Corporation (HRC). The high operating frequency of this accelerator allows for the production of ultra-short bunches of about 180 femtoseconds. We will present detailed calculations of the optimization of the experimental system and of the expected bunch length resolution.
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