Beam Instrumentation

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Beam Instrumentation

• J. Alexander Cornell accelerator group
• Cornell University

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Beam Instrumentation

• Beam-based alignment gt beam diagnostic devices
  are key elements of the machine.
• Very small beam emittance, very high resolution,
  long-term stabilitygt the devices themselves are
  extremely challenging.
• Beam instrumentation needed for a linear
  collider
• high resolution beam position monitors,
• beam size (emittance) monitors,
• luminosity monitors,
• bunch length monitors,
• polarization monitors,
• specialized devices (e.g, halo monitors).

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Beam Instrumentation Whats our plan?

• We will review the beam instrumentation needed
  for a linear collider, and identify development
  efforts for us to participate in.
• We will focus on
• key instrumentation which is most important for
  collider luminosity performance, as identified
  through discussion with experts in the field and
  the results of beam simulations.
• specialized instrumentation needed to understand
  and diagnose specific physics issues.
• topics for which our experience in
  instrumentation development is particularly
  relevant.

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Examples of key beam instrumentation devices

• The use of optical transition radiation and
  optical diffraction radiation to measure the beam
  size
• Emittance measurements using optical transition
  radiation
• Bunch tilt measurements from rf bpms
• Bunch length monitors based on rf deflection
• Synchrotron radiation from gradient undulators as
  a single-pass beam size monitor
• Real-time bunch-by-bunch relative luminosity
  monitor

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Examples of specialized beam instrumentation
devices

• Beam monitors capable of single-turn vertical
  size measurements in the damping rings
• Devices to measure the beam polarization in the
  damping ring and the linac
• An ultra high resolution beam size monitor the
  beam at the IP
• Beam halo measurement devices
• Instruments to measure the electron cloud density
  in the positron damping rings.

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Beam Instrumentation Whats our plan?

• We will joining existing efforts where
  appropriate, and work to develop designs and
  prototypes of devices and associated electronics.
• When possible, we will use Cornells linac and
  synchrotron beams, as well as CESR, as tools to
  test diagnostic devices and techniques.
• In conjunction with our simulation efforts, we
  will explore the implications of instrumentation
  performance limitations and reliability on the
  luminosity of the collider.

Draft budget