Title :
Collective effects in single bunch mode at the Photon factory storage ring
Author :
Nakamura, N. ; Sakanaka, S. ; Haga, K. ; Izawa, M. ; Katsura, T.
Author_Institution :
KEK Nat. Lab. for High Energy Phys., Ibaraki, Japan
Abstract :
The bunch length and width in the single bunch mode were measured as a function of bunch current. Bunch lengthening and widening were observed and compared with theoretical models of potential-well distortion and microwave instability. The experimental data was found to agree with these theoretical models. At the same time, the longitudinal effective impedance was obtained. The coherent betatron tune shifts were also observed. The tune shifts were explained with the head-tail mode theory, which gave an estimate of the horizontal and vertical effective impedances.<>
Keywords :
electron accelerators; particle beam diagnostics; storage rings; Photon factory storage ring; bunch length; coherent betatron tune shifts; head-tail mode theory; longitudinal effective impedance; microwave instability; potential-well distortion; single bunch mode; vertical effective impedances; Energy measurement; Impedance; Length measurement; Photodiodes; Positrons; Production facilities; Radio frequency; Storage rings; Synchrotron radiation; Time measurement;
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.1991.164327
