Study Of Bunch By Bunch Feedback System In Tristan-Ar (2007)
Tobiyama And Kikutani, M. Tobiyama, E. Kikutani
Beam tests of the KEKB bunch by bunch feedback system prototypes have been performed in the TRISTAN-AR on both longitudinal and transverse planes. A two-tap FIR filter system consisting of hardware...
KEKB Beam Instrumentation Systems (2007)
M. Arinaga, J. Flanagan, S. Hiramatsu, T. Ieiri, H. Ikeda, H. Ishii, ...
For the stable high-luminosity operation and luminosity-increase, the electron and positron storage rings of the KEK B-Factory (KEKB) is equipped with various beam instrumentations, which have being...
Abstract PRESENT STATUS OF THE KEKB BUNCH FEEDBACK SYSTEMS (2007)
E. Kikutani, J. Flanagan, T. Ieiri, M. Tobiyama
KEKB is a double-ring energy-asymmetric electronpositron collider, now operating at KEK. In order to achieve a luminosity on the order of10 33 =cm 2 =sor more, a very large number of bunches are...
K. Akai, N. Akasaka, A. Enomoto, J. Flanagan, H. Fukuma, Y. Funakoshi, ...
The commissioning of the KEKB B–Factory storage rings started on Dec. 1, 1998. The two rings both achieved a stored current of over 0.5 A after operating for four months. The two beams were...
RECENT STUDIES ON BEAM-PHOTOELECTRON INSTABILITY IN BEPC (2007)
Y. H. Chin, H. Fukuma, S. Hiramatsu, M. Izawa, T. Kasuga, E. Kikutani, ...
An experiment investigating the photoelectron instability has been performed in BEPC at IHEP, China. The betatron oscillation of each bunch was observed and recorded by a single pass beam position...
COMMISSIONING OF KEKB BUNCH FEEDBACK SYSTEMS (2007)
Commissioning of KEKB started at the end of the last year. In the early stages of the commissioning, we observed transverse instabilities in both rings and started tuning of the bunch feedback...
LATTICE DIAGNOSTICS USING SINGLE KICK CLOSED ORBIT AT KEKB (2007)
Y. Ohnishi, K. Akai, N. Akasaka, A. Enomoto, J. Flanagan, H. Fukuma, ...
We have measured beta functions using single kick closed orbit at KEKB. The measured beta functions were compared with the model lattice and gradient errors were extracted from the result in a beta...
Measurement Of Beam-Beam Tune-Shift Parameter At Kekb (2007)
Ieiri Flanagan Fukuma, T. Ieiri, J. Flanagan, H. Fukuma, E. Kikutani, M. Tobiyama
We have measured the coherent beam-beam tune shift at KEKB, an asymmetric double-ring electron/positron collider. The relationship between the tune shift and the beam-beam parameter is nonlinear,...
Beam Diagnostics By Gating A Single Bunch At Kekb (2007)
Akai Fukuma Ieiri, K. Akai, H. Fukuma, T. Ieiri, T. Kawamoto, E. Kikutani, ...
A fast gate module has been developed at KEKB, which can pick up a signal of one bunch along a bunch train.Thegatemodulewasattachedtoatune measurement system and to a turn-by-turn beam-position...
Beam Diagnostics Using Bunch-By-Bunch Feedback (2007)
Systems In The, M. Tobiyama, E. Kikutani, J. W. Flanagan, S. Hiramatsu
Transverse bunch-by-bunch feedback systems for damping coupled-bunch instabilities in the KEKB rings have been working well since the early stages of the commissioning of the rings. Beam diagnostic...
Study Of Fast Ion Instability At Kekb Electron Ring (2007)
Ohnishi Fukuma Kikutani, Y. Ohnishi, H. Fukuma, E. Kikutani, K. Oide, M. Tobiyama
We have studied fast ion instability (FII) in the electron ring (HER) at KEKB. We introduce an application of Singular Value Decomposition (SVD) to study multi-bunch beam oscillations. The SVD...
Limitations Of Multibunch Feedback Systems And (2007)
Extrapolation Kikutani Flanagan, E. Kikutani, J. Flanagan, M. Tobiyama
In recent years, multibunch feedback systems which can handle bunches with 10-ns spacing (or shorter) are working at several accelerators around the world. The number of bunches stored in some of...
Compensation of the Crossing Angle with Crab Cavities at KEKB (2007)
Abe, T., Akai, K., Akemoto, M., Akiyama, A., Arinaga, M., Ebihara, K., ...
Crab cavities have been installed in the KEKB B--Factory rings to compensate the crossing angle at the collision point and thus increase luminosity. The beam operation with crab crossing has been...
Bunch By Bunch Feedback Systems For The Kekb Rings (2000)
Tobiyama Kikutani Flanagan, M. Tobiyama, E. Kikutani, J. W. Flanagan, S. Hiramatsu
Transverse bunch-by-bunch feedback systems for damping coupled-bunch instabilities in the KEKB rings have been working since the early stage of the commissioning of the rings. Stabilization of the...
Experimental study of the ion trapping phenomenon in TRISTAN-AR (1998)
Matsumoto, S, Fukuma, H, Ohmi, K, Tobiyama, M, Kikutani, E, Suetake, M, ...
The proposed experimental study on beam-photoelectron interactions in BEPC (1996)
Guo, Z Y, Liu, D K, Ma, L, Wang, J Q, Wang, S H, Zhang, C, ...
Front-end electronics for the bunch feedback systems for KEKB (1994)
Kikutani, E, Obina, T, Kasuga, T, Minagawa, Y, Tobiyama, M, Ma, L
Development of bunch feedback system for KEKB (1994)
Kikutani, E, Kasuga, T, Minagawa, Y, Obina, T, Tobiyama, M, Ma, L
Recent Progress In The Development Of The Bunch Feedback Systems For Kekb
Kikutani Kasuga Minagawa, E. Kikutani, T. Kasuga, Y. Minagawa, T. Obina, M. Tobiyama
In KEKB, which is a B-factory project at KEK, the bunch spacing is very short, only 2 ns, and the number of the bunches comes up to about 5000 per ring. In order to cure the instabilities due to the...