Horizontal coupling impedance of the APS storage ring

2004 ◽  
Author(s):  
Yong-Chul Chae ◽  
K. Harkay ◽  
Xiang Sun
Keyword(s):  
Storage Ring ◽  
Coupling Impedance

RF system of the SPring-8 storage ring

1998 ◽  
Vol 5 (3) ◽  
pp. 379-381
Author(s):  
Hiroyasu Ego ◽  
Masahiro Hara ◽  
Yoshitaka Kawashima ◽  
Yuji Ohashi ◽  
Takashi Ohshima ◽  
...  
Keyword(s):  
Storage Ring ◽  
Cooling Water ◽  
Higher Order ◽  
Synchrotron Radiation Beam ◽  
Order Mode ◽  
Coupling Impedance ◽  
Radiation Beam ◽  
Rf System ◽  
Higher Order Modes ◽  
Cavity Cooling

Construction of three RF stations in the storage ring of SPring-8 has been completed. The design concept concentrates on avoiding a coupled-bunch instability which limits the stored current or makes the synchrotron radiation beam unstable. The cavity is bell-shaped to reduce the coupling impedance of the higher-order modes. The cavity dimensions are trimmed systematically to distribute the higher-order mode frequencies. Each cavity has two movable tuners. The temperature of the cavity cooling water is controlled within 0.02 K and the water flow is kept constant. The construction and commissioning of the SPring-8 storage ring RF system is reported.

scholarly journals Coupling impedance of vacuum pumping holes for the APS storage ring

1993 ◽  
Author(s):  
J. Zhou ◽  
J.J. Song ◽  
R.L. Kustom
Keyword(s):  
Storage Ring ◽  
Coupling Impedance

scholarly journals Collective effects in a diffraction-limited storage ring

2014 ◽  
Vol 21 (5) ◽  
pp. 937-960 ◽  
Author(s):  
Ryutaro Nagaoka ◽  
Karl L. F. Bane
Keyword(s):  
Storage Ring ◽  
Transverse Mode ◽  
Collective Effects ◽  
Coupling Impedance ◽  
Machine Performance ◽  
Coherent Synchrotron Radiation ◽  
Resistive Wall ◽  
Mode Coupling Instability ◽  
Beam Instabilities ◽  
Low Emittance

This paper gives an overview of collective effects that are likely to appear and possibly limit the performance in a diffraction-limited storage ring (DLSR) that stores a high-intensity ultra-low-emittance beam. Beam instabilities and other intensity-dependent effects that may significantly impact the machine performance are covered. The latter include beam-induced machine heating, Touschek scattering, intra-beam scattering, as well as incoherent tune shifts. The general trend that the efforts to achieve ultra-low emittance result in increasing the machine coupling impedance and the beam sensitivity to instability is reviewed. The nature of coupling impedance in a DLSR is described, followed by a series of potentially dangerous beam instabilities driven by the former, such as resistive-wall, TMCI (transverse mode coupling instability), head–tail and microwave instabilities. In addition, beam-ion and CSR (coherent synchrotron radiation) instabilities are also treated. Means to fight against collective effects such as lengthening of the bunch with passive harmonic cavities and bunch-by-bunch transverse feedback are introduced. Numerical codes developed and used to evaluate the machine coupling impedance, as well as to simulate beam instability using the former as inputs are described.

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