Title :
Test of the transport properties of a helical electrostatic quadrupole and quasi-octupole
Author :
Xiu, L. ; Ohnuma, S. ; Wang, K. ; Meitzler, C.R. ; Xu, Y.
Author_Institution :
Dept. of Phys., Houston Univ., TX, USA
Abstract :
A third-generation continuous helical electrostatic quadrupole (HESQ) lens has been built and tested. The new HESQ is 21.5 cm long and has a 3.6 cm diameter aperture. The HESQ has been tested under two separate conditions: with a pulsed 25 keV, 0.5 mA proton beam; and a 25 keV, 10 mA proton beam. The input emittance was fixed using a multi-aperture collimator. A comparison is made between experiment and numerical simulations for a wide variety of operating conditions. A second possible operating mode is the quasi-octupole mode which offers significantly reduced aberration when compared to the quadrupole mode. The results of preliminary tests in this operating mode will be presented
Keywords :
beam handling equipment; beam handling techniques; electrostatic lenses; 21.5 cm; 25 keV; 3.6 cm; emittance; helical electrostatic octupole lens; helical electrostatic quadrupole lens; numerical simulation; proton beam; transport properties; Collimators; Current measurement; Electrostatics; Flanges; Ion beams; Lenses; Numerical simulation; Particle beams; Testing; Time measurement;
Conference_Titel :
Particle Accelerator Conference, 1993., Proceedings of the 1993
Conference_Location :
Washington, DC
Print_ISBN :
0-7803-1203-1
DOI :
10.1109/PAC.1993.309582
