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Review of Scientific Instruments / Volume 76 / Issue 7 / PARTICLE SOURCES, OPTICS AND ACCELERATION; PARTICLE DETECTORS

Rev. Sci. Instrum. 76, 073302 (2005); http://dx.doi.org/10.1063/1.1946407 (9 pages)

Design of a standing-wave multicell radio frequency cavity beam monitor for simultaneous position and emittance measurement

Jin-Soo Kim1, Roger Miller2, and Christopher Nantista2

1FAR-TECH, Inc., San Diego, California 92121
2Stanford Linear Accelerator Center, Menlo Park, California 94025

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(Received 17 September 2004; accepted 28 March 2005; published online 22 June 2005)

High precision, nondisruptive emittance measurement through second moment monitoring requires precise beam position at the measurement location. We present the design and analysis of a multicavity standing wave structure for a pulse-to-pulse beam position-emittance measurement system in which the quadrupole and the dipole standing wave modes resonate at harmonics of a presumed beam bunch train frequency. As an application for the Next Linear Collider (NLC) beams, an optimized nine-cavity standing-wave structure is designed for simultaneous high precision beam position and emittance measurement. It operates with the π-phase advance quadrupole mode resonating at the 16th harmonic (11.424 GHz) of the NLC bunch frequency and the 3π/4-phase advance dipole mode at the 12th harmonic (8.568 GHz). The output powers from these modes are estimated for the NLC beams. Measurement resolution is estimated to be on the micron scale for rms beam size and on the nanometer scale for beam position.

© 2005 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. DESIGN OF MULTI-CAVITY STANDING-WAVE CAVITY SYSTEM
    1. Zeroth-order pillbox design: Resonant frequencies and transit factors
    2. Modes in a multiple-cell structure and the subsystem designs
      1. The cavity design for the π -quadrupole mode and the 3π/4 dipole modes
      2. The standard cell design
      3. The end cell design
      4. The pickup cell design, including the hybrid networks
    3. The complete nine-cell structure design
  3. BEAM ANALYSIS
    1. Single bunch analysis
    2. Multibunch analysis
  4. TUNING OF QUADRUPOLE AND DIPOLE FREQUENCIES

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KEYWORDS and PACS

Keywords

monitoring, particle beam diagnostics, linear colliders, position measurement

PACS

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.1946407

PUBLICATION DATA

ISSN

0034-6748 (print)  
1089-7623 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    M. Ross, AIP Conf. Proc. 279, 807 (1993)APCPCS000279000001000807000001.

    A. Jansson, Phys. Rev. ST Accel. Beams 5, 072803 (2002).

    R. Johnson, Z. Li, T. Naito, J. Rifkin, S. Smith, and V. Smith, AIP Conf. Proc. 648, 321 (2002)APCPCS000648000001000321000001.

    D. H. Whittum and Y. Kolomensky, Rev. Sci. Instrum. 70, 2300 (1999)RSINAK000070000005002300000001.


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