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superconductivity

  
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MOOPMA01 Challenges in ILC SCRF Technology linear-collider, controls, monitoring, coupling 26
 
  • D. Reschke
    DESY, Hamburg
  With a baseline operating gradient of 31,5 MV/m at a Q-value of 1·1010 the superconducting nine-cell cavities for the ILC are a challenging milestone for SRF technologie. Worldwide intensive ILC R&D programs are underway or in the planning stage in the all three regions of America, Asia and Europe. This paper will give an overview of the main activities in superconducting RF (SRF) technology.  
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MOOPMA04 Crab Cavity Development vacuum, luminosity, dipole, monitoring 36
 
  • Y. Morita, K. Akai, K. Ebihara, T. Furuya, K. Hara, T. Honma, K. Hosoyama, A. Kabe, Y. Kojima, S. Mitsunobu, H. Nakai, K. Nakanishi, M. Ono, Y. Yamamoto
    KEK, Ibaraki
  • T. Kanekiyo
    Hitachi Ltd., Hitachi Research Laboratory, Ibaraki-ken
  • K. Okubo, K. Sennyu
    MHI, Kobe
  • M. M. Rahman
    University of Chittagong, Chittagong
  Tow superconducting crab cavities, witch will be installed in the KEKB accelerator, is being assembled. The KEKB (KEK B-factory) is a double-ring, asymmetric-energy, high luminosity electron-positron colliding accelerator with a finite angle beam crossing. A purpose of the crab cavities is to deflect the beam-bunch with time-varying RF fields, and to provide the head-on collision at the interaction point (crab crossing scheme). The head-on collision will drastically increase luminosity. The crab cavity is required to have high RF fields (kick voltage) to provide beam-bunch deflection. This mode (crab mode, 509 MHz) is not the lowest order mode (LOM) of the cavity. In order to damp the LOM as well as the HOMs, a coaxial coupler is attached along the beam pipe. Two crab cavities have been fabricated and tested in a vertical cryostat. These cavities have already achieved the required kick voltage. One cavity was recently tested with high RF power in a cryomodule. After some conditioning, this cavity has achieved the required kick voltage. The test revealed some modifications were needed. After improvements, the cavity will be ready for installation.  
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WEPMA133 Evaluation of External Q Using Kroll-Yu Method With Microwaves Studio resonance, coupling, impedance, proton 503
 
  • A. S. Dhavale, K. C. Mittal
    BARC, Mumbai
  Design and development of superconducting cavity has been taken up as a part of Accelerator Driven Subcritical project(ADSS). An input coupler is designed for the same using Kroll-Yu method*. The evaluation procedure is optimized and the method has been successfully implemented for the evaluation high external Q**. The validity of the Kroll-Yu method is tested with the external Q calculations by P. Balleyguier method for the Benchmark cavtity which is a pillbox cavity of diameter ~200 mm, length ~150 mm with semi-rigid coaxial line***. It is found that the careful choice of data points provides accurate results over wide range.

* N. M.Kroll, D. U.L. Yu, "Computer determination of the external Q and resonant frequency of waveguide loadaed cavities", SLAC-PUB-5171, Jan1990(A) ** A. S.Dhavale and K. C.Mittal,"Evaluation of external Q of the superconducting cavity using Kroll-Yu method", Review Of Scientific Instruments 77, 066101 (2006)*** P. Balleyguier, "A straightforward method for cavity external Q computation", Particle Accelerators, Vol.57, P.113-127, 1997