Title :
Modified octupoles for damping coherent instabilities
Author :
Cornacchia, M. ; Corbett, W.J. ; Halbach, K.
Author_Institution :
Stanford Synchrotron Radiat. Lab., CA, USA
Abstract :
The introduction tune spread in circular e/sup +/e/sup -/ accelerators with modified octupoles to reduce the loss of dynamic aperture is discussed. The new magnet design features an octupole field component on-axis and a tapered field structure off-axis to minimize loss of dynamic aperture. Tracking studies show that the modified octupoles can produce the desired tune spread in SPEAR without compromising confinement of the beam. The technique for designing such magnets is presented, together with an example of magnets that give the required field distribution.<>
Keywords :
beam handling equipment; beam handling techniques; electron accelerators; storage rings; SPEAR; a tapered field structure; confinement; dynamic aperture; introduction tune spread; magnet design features; modified octupoles; octupole field component; Apertures; Damping; Laboratories; Linear accelerators; Magnetic confinement; Magnetic cores; Magnetic fields; Particle beams; Protons; Synchrotron radiation;
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.1991.164781
