High Power test of a low group velocity X-band Accelerator Structure for CLIC (2008)
Döbert, S, Grudiev, A, Riddone, G, Taborelli, M, Wuensch, W, Zennaro, R, ...
In recent years evidence has been found that the maximum sustainable gradient in an accelerating structure depends on the rf power flow through the structure. The CLIC study group has consequently...
G. Ciovati, DESY Maschinenphysik, T. Higo, P. Kneisel, J. Mammosser, A. Matheisen, ...
Internal report | Preprint
Superconducting Focusing Solenoid For X-Band Klystron (2007)
Ogitsu Higo And, T. Ogitsu, T. Higo, H. Mizuno, Y. Imai, T. Inaguchi, ...
INTRODUCTION The X-band klystron, now being developed at KEK [1], requires a focusing solenoid whose warm bore aperture is about 180 mm and maximum axial field is 7 kGauss. The normal conducting...
Design Of An Rf System For The Atf Damping Ring (2007)
S. Sakanaka, F. Hinode, M. Akemoto, H. Hayano, H. Matsumoto, ...
This paper describes the overall design of an RF system for the ATF damping ring (DR). The RF system comprises four single-cell cavities, one 250-kW klystron, a WR1150 waveguide network and a...
Design Of A High-Power Test Cavity For The Atf Damping Ring (2007)
Sakanaka Hinode Akemoto, S. Sakanaka, F. Hinode, M. Akemoto, S. Tokumoto, T. Higo, ...
INTRODUCTION A HOM damped cavity for the ATF damping ring (DR) [1] is under development at KEK. This cavity is capable of avoiding coupled-bunch instabilities driven by higher order modes (HOMs). In...
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...
Achievement of ultra-low emittance beam in the ATF damping ring (2003)
Honda, Y, Anderson, S, Araki, S, Bane, Karl Leopold Freitag, Brachmann, A, Frisch, J, ...
We report on the smallest vertical emittance achieved in single-bunch-mode operation of the ATF. The emittances were measured with a laser-wire beam-profile monitor installed in the damping ring. The...
Processing Studies of X-Band Accelerator Structures at the NLCTA (2001)
Adolphsen, C., Baumgartner, W., Jobe, K., Pimpec, F. Le, Loewen, R., McCormick, D., ...
RF processing studies of 1.8-m X-band (11.4 GHz) traveling wave structures at the Next Linear Collider Test Accelerator (NLCTA) have revealed breakdown-related damage at gradients lower than expected...
Jones, R. M., Kroll, N. M., Higo, T., Miller, R. H., Ruth, R. D
Operating the SLAC/KEK DDS (Damped Detuned Structure) X-band linacs at high gradients (in excess of 70MV/m) has recently been found to be limited by the accelerator structures breaking down and as a...
Jones, R. M., Kroll, N. M., Higo, T., Li, Z., Miller, R. H., Raubenheimer, T. O., ...
Recent experiments at SLAC [1,2] and CERN [3] have revealed evidence of significant deformation in the form of "pitting" of the cells of the 1.8m series of structures DDS/RDDS (Damped Detuned...
Design of the JLC/NLC RDDS Structure Using Parallel Eigensolver Omega3p (2000)
Li, Z., Folwell, N. T., Ko, K., Loewen, R. J., Lundahl, E. W., McCandless, B., ...
The complexity of the Round Damped Detuned Structue (RDDS) for the JLC/NLC main linac is driven by the considerations of rf efficiency and dipole wakefield suppression. As a time and cost saving...
Wang, J. W., Adolphsen, C., Bowden, G. B., Burke, D. L., Cornuelle, J., Dolgashev, V. A., ...
As a joint effort in the JLC/NLC research program, we have developed a new type of damped detuned accelerator structure with optimized round-shaped cavities (RDDS). This paper discusses some...
RF Processing of X-band Accelerator Structures at the NLCTA (2000)
Adolphsen, C., Baumgartner, W., Jobe, K., Loewen, R., McCormick, D., Ross, M., ...
During the initial phase of operation, the linacs of the Next Linear Collider (NLC) will contain roughly 5000 X-Band accelerator structures that will accelerate beams of electrons and positrons to...
Jones, R. M., Higo, T., Higashi, Y., Toge, N., Kroll, N. M., Loewen, R. J., ...
In fabricating the first X-Band RDDS (Rounded Damped Detuned Structure) accelerator structure, microwave measurements are made on short groups of discs prior to bonding the discs of the entire...
Fabrication Process of Rounded Damped Detuned Structure (2000)
Hitomi, N., Funahashi, Y., Higashi, Y., Higo, T., Koike, S., Suzuki, T., ...
Following the successful design and fabrication of Damped Detuned Structures (DDS), the JLC/NLC linear collider project advanced to Rounded Damped Detuned Structures (RDDS) with curved cross section...
Meeting Tight Frequency Requirement of Rounded Damped Detuned Structure (2000)
Higo, T., Funahashi, Y., Higashi, Y., Hitomi, N., Suzuki, T., Takata, K., ...
Following successful design and fabrication of damped detuned structures, the R&D for the accelerating structures of the NLC/JLC linear collider project proceeded to studies of Rounded Damped Detuned...
Recent results on KEK/ATF damping ring (2000)
Urakawa, J, Akemoto, M, Araki, S, Funahashi, Y, Hayano, H, Higo, T, ...
Physics and technology of the Next Linear Collider (2000)
Kuhlman, S, Adolphsen, C E, Aiello, R, Akemoto, M, Alley, R, Assmann, R W, ...
We present the current expectations for the design and physics program of an e+e- linear collider of center of mass energy 500 GeV -- 1 TeV. We review the experiments that would be carried out at...
Detuned accelerating structure for linear collider (1998)
Higo, T, Funahashi, Y, Higashi, Y, Koike, S, Suzuki, T, Takatomi, T, ...
Possibility of precise wakefield measurement at ATF extraction line (1998)
Kashiwagi, S, Hayano, H, Higo, T, Kubo, K, Oide, K, Takata, K, ...
A damped detuned structure for the next linear collider (1997)
Miller, R H, Adolphsen, C E, Bane, Karl Leopold Freitag, Fowkes, W R, Gluckstern, R L, Hanna, S M, ...
Precise fabrication of 1.3 m-long X-band accelerating structure (1996)
Higo, T, Sakai, H, Higashi, Y, Koike, S, Takatomi, T, Suzuki, T, ...
Design of a high-power test cavity for the ATF damping ring (1995)
Sakanaka, S, Hinode, F, Akemoto, M, Tokumoto, S, Higo, T, Urakawa, J, ...
Design of an rf system for the ATF damping ring (1995)
Sakanaka, S, Hinode, F, Akemoto, M, Hayano, H, Matsumoto, H, Kubo, K, ...
Measurement of wakefield suppression in a detuned x-band accelerator structure (1995)
Adolphsen, C E, Bane, Karl Leopold Freitag, Higo, T, Kubo, K, Miller, R, Ruth, Ronald D, ...
Low-power measurement on a HOM damped cavity for the ATF damping ring (1994)
Sakanaka, S, Hinode, F, Kubo, K, Higo, T, Urakawa, J, Rizawa, T
High gradient experiments on X-band disk loaded structures (1993)
Higo, T, Taniuchi, T, Yamamoto, M, Odagiri, J, Tokumoto, S, Mizuno, H, ...
F. Furuta, DESY Maschinenphysik, Y. Higashi, T. Higo, H. Inoue, ...
Poster
Optimization of the Low-loss SRF Cavity for the ILC. 2007-06-25 - 2007-06-29
Z. Li, DESY Maschinenphysik, L. Ge, K. Ko, L. Lee, ...
Poster
Precise Fabrication Of X-Band Detuned Accelerating Structure For Linear Collider
T. Higo, H. Sakai, Y. Higashi, T. Takatomi, S. Koike
microns along 1.2m stacking was obtained though a severe trouble happened to the jiggings. Based on these experiences, the possibility of a precise fabrication method for the detuned structure in...