Title :
Matching and transport of beams in a continuously twisted quadrupole channel
Author :
Tiefenback, M.G. ; Lidestri, J.P. ; Bailey, V.L., Jr. ; Putnam, S.D.
Author_Institution :
Pulse Sciences Inc., San Leandro, CA, USA
Abstract :
Twisted quadrupole (stellarator) focusing can reduce dispersion in the bends of a recirculating accelerator such as the Spiral Line Induction Accelerator (SLIA). Envelope oscillations caused by guide field/stellarator transitions add free energy to the beam which can couple into the beam emittance. This effect can be reduced by phase space matching of the beam at the transitions. Experimental results are presented on the coupled 4D problem of envelope matching into a straight helical quadrupole channel. These results are compared with envelope code predictions. Expected benefits from such matching in a few-turn accelerator system are discussed.<>
Keywords :
beam handling techniques; collective accelerators; focusing; SLIA; Spiral Line Induction Accelerator; beam emittance; continuously twisted quadrupole channel; coupled 4D problem; envelope code predictions; few-turn accelerator system; focusing; free energy; guide field/stellarator transitions; phase space matching; recirculating accelerator; stellarator; transport; Acceleration; Current density; Frequency; Geometry; Lenses; Mouth; Optical coupling; Particle beams; Solenoids; Spirals;
Conference_Titel :
Particle Accelerator Conference, 1991. Accelerator Science and Technology., Conference Record of the 1991 IEEE
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-0135-8
DOI :
10.1109/PAC.1991.165232
