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NLC

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PS20 Beam Diagnostic for the Next Linear Collider instrumentation, diagnostics, linear-collider 151
 
  • S.R. Smith
    SLAC, Stanford Linear Accelerator, Stanford, CA, USA
  The Next Linear Collider (NLC) is proposed to study e+-e--collisions in the TeV energy region. The small beam spot size at the interaction point of the NLC makes its luminosity sensitive to beam jitter. A mechanism for aligning the beams to each other which acts during the bunch-train crossing time has been proposed to maintain luminosity in the presence of pulse-pulse beam jitter. We describe a beam-beam deflection feedback system which responds quickly enough to correct beam misalignments within the 265 ns long crossing time. The components of this system allow for a novel beam diagnostic, beam-beam deflection scans acquired in a single machine pulse.  
 
PM09 Design of a Multi-Bunch BPM for the Next Linear Collider
Work supported by the US Department of Energy, contract DE-AC03-76SF00515 		instrumentation, diagnostics, pick-up, linear-collider 183
 
  • A. Young, S.D. Anderson, D. Anderson, J. Nelson, M. Ross, S.R. Anderson, T.J. Smith, H.T. Naito, N. Terunuma, S. Araki
    SLAC, Stanford Linear Accelerator, Stanford, CA, USA
  The Next Linear Collider (NLC) design requires precise control of colliding trains of high-intensity (1.4×1010 particles/bunch) and low-emittance beams. High-resolution multi-bunch beam position monitors (BPMs) are required to ensure uniformity across the bunch trains with bunch spacing of 1.4ns. A high bandwidth (~350 MHz) multi-bunch BPM has been designed based on a custom-made stripline sum and difference hybrid on a Teflon-based material. High bandwidth RF couplers were included to allow injection of a calibration tone. Three prototype BPMs were fabricated at SLAC and tested in the Accelerator Test Facility at KEK and in the PEP-II ring at SLAC. Tone calibration data and single-bunch and multi-bunch beam data were taken with high-speed (5Gsa/s) digitisers. Offline analysis determined the de-convolution of individual bunches in the multi-bunch mode by using the measured single bunch response. The results of these measurements are presented in this paper.