As a typical case, the consolidation of natural clay layers occurring under the condition of no lateral strain is studied. For such a case, the lateral stress decreases with the process of...
Mechanical Properties of Soft Rocks (9999)
The plastic yielding and rate sensitive properties of soft sedimentary rocks are experimentally investigated in the case when only the volume expansion occurs during the plastic deformation process....
Constitutive Equations for Geomechanical Materials Based on Elasto-Viscoplasticity (9999)
Akai,K., Adachi,T., Fujimoto,K.
The general features of geomechanical materials are investigated by using a porous tuff as an ideal geomechanical material. Then the constitutive equations for the materials are derived based on...
Analytical and Experimental Study of Consolidation with Vertical Sand Drains (9999)
Akai,K., Ohnishi,Y., Tamura,T., Yasukawa,I.
Vertical sand drains are one of the most effective ways to improve soft ground. The actual function of vertical sand drains, with respect to settlement and excess pore water pressure, is...
Finite Element Analysis of Three-Dimensional Flow in Saturated-Unsaturated Soils (9999)
Akai,K., Ohnishi,Y., Nishigaki,M.
The problem of non-steady three-dimensional flow of water in saturated-unsaturated porous media has been solved by a finite element approach. The governing equation has been formulated in terms of...
Abstract REVIEW OF EXPERIENCE WITH HOM DAMPED CAVITIES (2008)
At Previous Conferences, J. Kirchgessner, K. Akai
The RF systems for the next generation of high luminosity electron-positron and proton-proton colliders face new challenges. To achieve the desired luminosities, ampere beam currents need to be...
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...
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...
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...
Small Angle Crab Compensation for LHC IR Upgrade (2007)
Akai, K, Calaga, R, Dorda, U, Ohmi, K, Oide, K, Tomás, R, ...
A small angle crab scheme is being considered for the LHC luminosity upgrade. In this paper we present a 400MHz superconducting cavity design and discuss the pertinent RF challenges. We also present...
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...
RF system for KEK B-Factory (2000)
Ezura, E, Akai, K, Akasaka, N, Ebihara, K, Isagawa, S, Nakanishi, H, ...
The ARES cavity for KEKB (1998)
Kageyama, T, Takeuchi, Y, Akasaka, N, Naito, F, Sakai, H, Mizuno, H, ...
The input coupler for The KEKB ARES cavity (1998)
Naito, F, Sakai, H, Yoshimoto, S, Mizuno, H, Akasaka, N, Kageyama, T, ...
HOM characteristics of the ARES cavity (1998)
Kobayashi, T, Akai, K, Akasaka, N, Ezura, E, Kageyama, T, Mizuno, H, ...
Coupling cavity damper for the ARES (1998)
Naito, F, Akai, K, Akasaka, N, Ezura, E, Kageyama, T, Mizuno, H, ...
HOM absorber for the ARES cavity (1998)
Tekeutchi, F, Akai, K, Akasaka, N, Ezura, E, Kageyama, T, Mizuno, H, ...
Development of high-power ARES cavities (1998)
Kageyama, T, Akai, K, Akasaka, N, Ezura, E, Mizuno, H, Naito, F, ...
Beam test of a superconducting damped cavity for KEKB (1998)
Furuya, T, Akai, K, Asano, K, Ezura, E, Hara, K, Hosoyama, K, ...
The ARES cavity for the KEK B-factory (1996)
Kageyama, T, Akai, K, Akasaka, N, Ezura, E, Mizuno, H, Naito, F, ...
Tuning control and transient response of the ARES for KEKB (1996)
Akai, K, Akasaka, N, Ezura, E, Kageyama, T, Mizuno, H, Naito, F, ...
The SiC absorber for the KEKB ARES cavity (1996)
Takeuchi, Y, Akai, K, Akasaka, N, Ezura, E, Kageyama, T, Mizuno, H, ...
A prototype module of a superconducting damped cavity for KEKB (1996)
Furuya, T, Akai, K, Asano, K, Ezura, E, Hara, K, Hosoyama, K, ...
Input coupler for the KEKB normal conducting cavity (1995)
Naito, F, Akai, K, Akasaka, N, Ezura, E, Kageyama, T, Shintake, T, ...
Development of a HOM-damped cavity for the KEK B-factory (KEKB) (1995)
Kageyama, T, Akai, K, Akasaka, N, Ezura, E, Naito, F, Shintake, T, ...
HOM absorber for the KEKB normal conducting cavity (1995)
Takeuchi, Y, Akai, K, Akasaka, N, Ezura, E, Kageyama, T, Naito, F, ...
An accelerator resonantly coupled with an energy storage (ARES) for the KEKB (1995)
Yamazaki, Y, Akai, K, Akasaka, N, Ezura, E, Kageyama, T, Naito, F, ...
Development Of A Hom-Damped Cavity For The Kek B-Factory (kekb)
T. Kageyama, K. Akai, N. Akasaka, E. Ezura, F. Naito, T. Shintake, ...
This paper describes a high-power test model of the normal conducting RF cavity for the KEK B Factory, KEKB. This cavity is loaded with a large coaxial waveguide for higher order mode (HOM) damping....
Akai Ezura And, K. Akai, E. Ezura, Y. Yamazaki
An RF system for KEKB to be commissioned in FY1998 has been designed. The key issue in the KEKB RF system is to solve problems arising from an extremely heavy beam loading, since the stored current...
Hom Absorber For The Kekb Normal Conducting Cavity
Y. Takeuchi, K. Akai, N. Akasaka, E. Ezura, T. Kageyama, F. Naito, ...
INTRODUCTION A prototype of normal conducting cavity for KEKB has been designed and built [1]. This prototype cavity is loaded with a coaxial waveguide for damping higher order modes (HOM's)....
Input Coupler For The Kekb Normal Conducting Cavity
F. Naito, K. Akai, N. Akasaka, E. Ezura, T. Kageyama, T. Shintake, ...
INTRODUCTION The reliability of the input coupler is usually the critical technical issue for the development of the cavity system. At present stage the cavity for KEK B-factory requires about 400KW...
Rf Characteristics Of Ares Cold Models
N. Akasaka, K. Akai, T. Kageyama, T. Shintake, Y. Yamazaki
this paper.
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...