Transcript Beam Instrumentation

Beam Instrumentation
J. Alexander + Cornell accelerator
group
Cornell University
LCCOM2 Instrumentation
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Beam Instrumentation
• Beam-based alignment => beam diagnostic
devices are key elements of the machine.
• Very small beam emittance, very high resolution,
long-term stability=> the devices themselves are
extremely challenging.
• Beam instrumentation needed for a linear collider:
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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: What’s 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 bpm’s
• Bunch length monitors based on rf deflection;
• Synchrotron radiation from gradient undulators as a singlepass 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: What’s 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 Cornell’s 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
Instrumentation
Grad s tudents (2 )
I ns truments
Totals
Year 1
Year 2
80
20
100
LCCOM2 Instrumentation
Year 3
80
20
100
80
20
100
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