Title :
Collective effects in SPEAR 3
Author :
Limborg, C. ; Sebek, J.
Author_Institution :
SSRL, SLAC, Stanford, CA, USA
Abstract :
SSRL is investigating an upgrade to run SPEAR with a small emittance (18 nm) and with a 200-500 mA current, significantly greater than the present 100 mA value of SPEAR 2. Using experimental measurements, numerical calculations of impedance, and results from tracking code simulations, an impedance model for SPEAR 3 is calculated. Beam quality and instability thresholds for these results are predicted. Based on these calculations, choices made for RF cavities, vacuum chamber material and cross-section, and BPM design are also discussed. The estimated beam lifetime for 500 mA is 22 hours
Keywords :
accelerator RF systems; accelerator cavities; electron accelerators; particle beam diagnostics; storage rings; 22 h; RF cavities; SPEAR 3; beam instability; beam lifetime; beam position monitor; beam quality; current; emittance; impedance; tracking code; vacuum chamber material; Electron beams; Feedback; Impedance measurement; Life estimation; Lifetime estimation; Radio frequency; Storage rings; Threshold current; Vacuum arcs; Vacuum systems;
Conference_Titel :
Particle Accelerator Conference, 1999. Proceedings of the 1999
Conference_Location :
New York, NY
Print_ISBN :
0-7803-5573-3
DOI :
10.1109/PAC.1999.792691
