Status of LHC Crab Cavity simulations and beam studies (2009)
Calaga, R, De-Maria, R, Assmann, R, Barranco, J, Caspers, F, Ciapala, Edmond, ...
The LHC crab cavity program is advancing rapidly towards a first prototype which is anticipated to be tested during the early stages of the LHC phase I upgrade and commissioning. The general project...
BETATRON SIDEBANDS DUE TO ELECTRON CLOUDS UNDER COLLIDING BEAM CONDITIONS (2008)
J. W. Flanagan, K. Ohmi, H. Fukuma, Y. Funakoshi, S. Hiramatsu, H. Ikeda, ...
Proceedings of 2005 Particle Accelerator Conference, Knoxville, Tennessee Recently, we have observed vertical betatron sidebands in the transverse beam spectra of positron bunches at the KEKB LER...
DYNAMIC BEAM-BEAM EFFECTS MEASURED AT KEKB (2008)
T. Ieiri, Y. Funakoshi, T. Kawamoto, M. Masuzawa, M. Tobiyama
A series of measurements were carried out to investigate the dynamic beam-beam effects. The beambeam kick and the beam-beam tune-shift were obtained by comparing the beam parameters between a...
FIRST BEAM COLLISION IN THE KEKB (2007)
Y. Funakoshi, K. Akai, N. Akasaka, A. Enomoto, J. Flanagan, H. Fukuma, ...
following expression. The first beam collision study was done in the KEKB double ring collider. Beam collision conditions were found by searching beam-beam deflection curves in a trial-and-error...
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...
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...
Beam-Beam Effect Observed In The Kekb (2007)
Funakoshi Akai Ebihara, Y. Funakoshi, K. Akai, K. Ebihara, K. Egawa, A. Enomoto, ...
This report summarizes observed phenomena related to the beam-beam effects in the KEKB collider. A general performance of the beam-beam effect is described. An emphasis is put on the reduction of the...
Measurement Of Xy Coupling Using Turn-By-Turn Bpm (2007)
At Kekb Ohnishi, Y. Ohnishi, Y. Funakoshi, K. Mori, E. Perevedentsev, M. Tanaka, ...
We have measured xy coupling of the interaction point(I.P.) at KEKB. When a normal mode is excited by a shaker with tune frequency, the horizontal or vertical betatron oscillations can be measured by...
Current Ma Current, Y. Funakoshi, K. Akai, N. Akasaka, K. Bane, A. Enomoto, ...
This report summarizes a recent progress of the KEKB whose commissioning started on December 1st 1998. Since the commissioning of earlier period was described in other papers [1][2], this report...
Synchrotron Radiation Interferometer Calibration Check by Use of A Size Control Bump in KEKB (2007)
Iida, N., Flanagan, J., Funakoshi, Y., Oide, K.
In KEKB, synchrotron radiation interferometers (SRMs) are used for measuring the transverse beam sizes. There is also a tool for enlarging the vertical beam size intentionally by making an asymmetric...
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...
Measurements Of Single Bunch Stability In LEP (2000)
Brandt, D, Cornelis, Karel, Funakoshi, Y, Hagel, J, Jowett, John M, Peschardt, E, ...
Beam optics matching in the KEKB injector linac (2000)
Kamitani, T, Koiso, H, Akasaka, N, Enomoto, A, Flanagan, J, Fukuma, H, ...
Commissioning of the KEKB linac (1998)
Ogawa, Y, Akasaka, N, Enomoto, A, Flanagan, J, Fukuma, H, Funakoshi, Y, ...
Experimental study of the ion trapping phenomenon in TRISTAN-AR (1998)
Matsumoto, S, Fukuma, H, Ohmi, K, Tobiyama, M, Kikutani, E, Suetake, M, ...
Beam-based measurement of strength errors in quadrupole magnets with orbit bumps (1996)
Koiso, H, Fukuma, H, Funakoshi, Y, Kamada, S, Matsumoto, S, Oide, K, ...
Feasibility Study Of An Orbit Feedback System For The Kekb Facility
Funakoshi Tejima And, Y. Funakoshi, M. Tejima, H. Ishii
An orbit feedback system is vital for maintaining an optimum collision condition at a B factory where two beams circulate in separate rings. For this purpose the beam-beam deflection technique,...
Single-Beam Collective Effects In The Kek B-Factory
Chin Akai Funakoshi, Y. H. Chin, K. Akai, Y. Funakoshi, K. Oide, K. Satoh
In this paper, we deal with the issues of single-beam collective effects (the bunch lengthening and the transverse mode-coupling instability) and coupled-bunch beam instabilities due to RF cavities...