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Energy spectrometer cavity BPM

This research outlines the design and implementation of advanced beam position monitors (BPMs) utilizing resonant cavity technology for the International Linear Collider (ILC). A precision energy measurement is crucial for experiments below 500 GeV, and our BPMs aim for a precision of 10 MeV to 50 MeV. The project involves collaboration between Royal Holloway, University of London, University of Cambridge, and University College London, focusing on various BPM designs, measurement resolutions, calibration techniques, and the integration of magnets for improved spectrometer performance.

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Energy spectrometer cavity BPM

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  1. Energy spectrometer cavity BPM Royal Holloway, University of London S. Boogert, G. Boorman University of Cambridge M. Slater, M. Thomson & D. Ward University College London D. Attree, F. Gournaris, A. Lyapin, B. Maiheu & M. Wing

  2. Threshold physics BPM BPM BPM • ILC will be a precision machine • Energy measurement corner stone for <500GeV physics • 10 MeV to 50MeV precision required • ILC baseline 4 magnet chicane • 5mm deflection at mid chicane • 10s nm BPM resolution required Important technology for the whole ILC beam delivery system

  3. Beam position monitors (BPMs) • Beam position monitors essential diagnostic for accelerators • Beam orbit in accelerator • Specialist applications such as energy spectrometer • Many different varieties exist • Operate via electromagnetic interaction with structure placed around the beam • Button (1mm - 10m) • Stripline (100 m - 1 m) • Resonant cavity (1 m - 20 nm) • Resonant cavity • Beam passage sets up EM standing wave in structure • Voltage in TM110 Mode depends linearly on beam position in cavity • Microwave radio frequency signal read out via waveguide and receiver electronics Waveguide coupler Cylindrical cavity

  4. SLAC End Station A San Francisco (Hwy 280) End Station A 2 mile LINAC Yerevan

  5. WP 9: SLAC End station A SLAC End station A • Plan to install Cu prototype in Jan/Feb 07 • Simple mover calibration system • Continuous analysis & improvement of ESA BPM data • BPM resolution ~200-700nm • Systematic drifts of ~500nm New UK BPM location SLAC linac cold BPM prototypes

  6. Cavity design • New S-band cavity design • 2.88 GHz, Qext~2000, =250 ns, ~10-20nm • Aluminium 1st prototype finished • First tests positive, small monopole coupling • Start copper vacuum prototype next week Monopole? Quadrupole Dipole

  7. Electronics design Mixdown and calibration electronics design finalised

  8. Calibration scheme • Simple calibration system • Components defined (diodes a bit of a problem)

  9. KEK Yerevan ATF Tokyo

  10. KEK ATF(2)

  11. KEK ATF(2) Typical runs ~few hours • World’s most advanced BPM system • UK collaboration leading the nanoBPM physics program and analysis • Best resolution ~15nm! • ATF2 cavity system • Worlds largest number of high resolution cavity BPMs • AL’s Electromagnetic design • Analysis based on WP9 developments • Spectrometer specific measurements • Long term stability (>4 hours) • Tilt resolution • Multi-bunch performance

  12. Simulation and integration • Magnets critical for spectrometer performance • Design & specification • Characterization and measurement • Operation (ramping during luminosity production) • Backgrounds and systematics • Synchrotron radiation • Halo, charged background effects • Systematics • Z pole calibration? • Energy loss to the IP Geant4/BDSIM simulations of spectrometer SR 

  13. Summary • RHUL/UCL/Cambridge collaboration • BPM design more or less finalized • Make first S-Band cavity next few months • Test in SLAC in Spring 07 • T474 Spectrometer test beam • Full magnet test beam during 07 • Magnet refurbishment and installation now! • ATF/ATF2 • Use BPMs for systematics studies • 3/4 magnet chicane • Calibration/gain drifts • Electromagnetic centre tracking

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