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WP 5: Diagnostics Coordinator: Grahame Blair, RHUL

WP 5: Diagnostics Coordinator: Grahame Blair, RHUL. Eurotev Open meeting, CERN, 13 th September 2004. Bunch profile Confocal Resonator Pick-up. Post Collision Diagnostics Energy spectrometry High Energy Polarimetry. Fast beamstrahlung monitor Beam Phase Measurement

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WP 5: Diagnostics Coordinator: Grahame Blair, RHUL

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  1. WP 5: Diagnostics Coordinator: Grahame Blair, RHUL Eurotev Open meeting, CERN, 13th September 2004 • Bunch profile • Confocal Resonator Pick-up. • Post Collision Diagnostics • Energy spectrometry • High Energy Polarimetry. • Fast beamstrahlung monitor • Beam Phase Measurement • Wide Band Current Pickup • Precision Beam Position Monitor • Beam tests at CTF3

  2. Output: • Strong groups, collaborating internationally. • Working prototype systems • International test beam work • RAs, technical staff and students gaining • essential experience. • Aim will be to include the work in the ILC design effort.

  3. Simulations with HFSS and GDFIDL. Position sensitive: compare excitation of modes with zero or maximum on the beam axis. Contact: Volker Ziemann CFBPM: Confocal Resonator Monitor • Uppsala University (+ CERN) • Problem: High frequency waveguide modes perturb measurements with short bunches in CTF3. • Objective: Design and test monitor that interacts with the direct quasi-TEM like field of the bunch, but is insensitive to waveguide modes (wakes). • Idea: Laser resonator does not radiate orthogonally to axis. By reciprocity external fields do not couple into resonator. • Solution: Passive confocal resonator monitor perpendicular to the direction of the beam.

  4. LBPM Contact: Grahame Blair • Oxford • RHUL • DESY • UCL • CERN PETRA, ATF → Global Collaboration Possible use of GAN systems for remote operation

  5. ESPEC (Cambridge, UCL) Contact: David Miller Design Considerations: • limit SR emittance growth • 360mrad total bend  0.5% • available space in lattice • no modifications necessary, yet • 10m drift space maximum one can consider for mechanical stabilization, alignment • 37m total empty space allows for BPMs outside of chicane to constrain external trajectories • Tiny energy loss before IP  Constraints lead to a required BPM resolution of ~100nm (Resolution  Stability) Measurement of Luminosity Energy Spectrum: Absolute E (survey, alignment) E jitter (fast BPMs) E dispersion (laserwire?)

  6. Laser amplification cavity for ILC polarimeter HEPOL: Contact: Fabian Zomer • Orsay 500 MHz or 5 MHz 10 nJ/pulse Electron beam 100 fs Pulsed laser Fabry-Perot cavity with Super mirrors Energy gain 104 • Proposed R&D : • Resonance of a high gain Fabry-Perot Cavity with a fs laser • Realization of a specific confocalcavity

  7. CAVBPM: Precision beam position monitor Contact: Marek Gasior Develop a BPM with <100 nm resolution, <10 µm precision, <15ns rise-time, with an aperture >4 mm for beam position monitoring in LC main beam and beam delivery system with the performance required from beam dynamics studies. • CERN TPMON: Precision beam phase measurement Contact: Jonathan Sladen • Precise phase stability of the main beam with respect to the RF is required for all linear colliders. • CLIC requires the phase error to be less than 15fs rms in order to limit luminosity loss. • This precision is more than an order of magnitude better than has currently been achieved both for phase reference distribution and for beam/RF phase measurement. • Both strategy and technology need to be found.

  8. CERN WBCM: Button PU Contact: Lars Soby Wide band beam current pick-up Develop a beam current monitor with  20 GHz bandwidth for measurement of intensity and longitudinal position bunch to bunch Provide a signal for machine set-up and for equalizing bunch-charge and -spacing. consist of 4 D=1.6mm buttons, from which the beam position and approximate intensity is derived. Can be used either as a standard PU or as a relative phase measurement along the pulse Applicable to LC main beams, drive beams and damping rings.

  9. CERN WBCM: ElectrostaticPU Contact: Lars Soby 100µs time constant → PU capacitance of order 100pF. dielectric constant >> 1 thickness of order 1mm. 4 electrodes: The special form of the cuts enhances linearity. electrode length ~ 50mm (2nF/m) output voltage ~ 4V Used to measure the overall pulse position

  10. DESY FLUM Contact: Wolfgang Lohman Studies of fastbeamstrahlung monitorfor IP beam characterisation V. Drugakov, ECFA workshop

  11. WP5 DIAG Summary • DIAG work package has maintained its scope, despite major cuts (travel and consumables were hit hard) • Increased input from the institutes was essential for this • Wide range of diagnostics – interesting programme • Many challenging issues addressed • Many institutes involved • Lots of interplay with the other WPs An interesting and challenging 3 years ahead of us

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