Beam Instrumentation J Alexander Cornell accelerator group Cornell

Beam Instrumentation J. Alexander + Cornell accelerator group Cornell University LCCOM 2 Instrumentation 1

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: – – – high resolution beam position monitors, beam size (emittance) monitors, luminosity monitors, bunch length monitors, polarization monitors, specialized devices (e. g, halo monitors). LCCOM 2 Instrumentation 2

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 diagnose specific physics issues. – topics for which our experience in instrumentation development is particularly relevant. LCCOM 2 Instrumentation 3

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 LCCOM 2 Instrumentation 4

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. LCCOM 2 Instrumentation 5

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 LCCOM 2 Instrumentation 6