| Paper |
Title |
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| TUYPA01 |
Femtosecond Bunch Length Measurements
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915 |
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- S.P. Jamison
CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
- G. Berden
FOM Rijnhuizen, Nieuwegein
- W.A. Gillespie, P.J. Phillips
University of Dundee, Nethergate, Dundee, Scotland
- A. MacLeod
UAD, Dundee
- B. Steffen
DESY, Hamburg
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The measurement of ultrashort longitudinal bunch profiles is of growing importance to accelerator development and operation. With requirements of ~10fs time resolution, and a desire for non-destructive and real time diagnostics, the challenges for diagnostic development are significant. Alongside more established transverse deflecting cavity and CTR measurement techniques, new approaches arriving from the field of ultrafast lasers offer significant potential; Ultrafast electro-optic detection has now been demonstrated on several accelerators, and in many distinct forms, although challenges remain in getting to the desired time resolution. Proposed schemes combining ultrafast laser diagnostics with FEL interactions, such as the "optical replica" scheme also have considerable potential. Here, an overview of the current status of femtosecond scale longitudinal profile diagnostics will be given, together with an outlook to the future expectations.
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Transparencies
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| TUYPA02 |
High Precision SC Cavity Alignment Diagnostics with HOM Measurements
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920 |
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- J.C. Frisch, L. Hendrickson, J. May, D.J. McCormick, S. Molloy, M.C. Ross, T.J. Smith
SLAC, Menlo Park, California
- N. Baboi, O. Hensler, L.M. Petrosyan
DESY, Hamburg
- N.E. Eddy, S. Nagaitsev
Fermilab, Batavia, Illinois
- O. Napoly, R. Paparella, C. Simon
CEA, Gif-sur-Yvette
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Experiments at the TTF at DESY have demonstrated that the Higher Order Modes induced in Superconducting Cavities can be used to provide a variety of beam and cavity diagnostics. The centers of the cavities can be determined from the beam orbit which produces minimum power in the dipole HOM modes. The phase and amplitude of the dipole modes can be used as a high resolution beam position monitor, and the phase of the monopole modes to measure the beam phase relative to the accelerator RF. Beam orbit feedback which minimizes the dipole HOM power in a set of structures has been demonstrated. For most SC accelerators, the existing HOM couplers provide the necessary signals, and the downmix and digitizing electronics are straightforward, similar to those for a conventional BPM.
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Transparencies
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| TUYPA03 |
Developments in Beam Instrumentation and New Feedback Systems for the ILC
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925 |
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This presentation will review the challenging beam properties that need to be measured and controlled and new diagnostic developments that address these challenges for ILC beam instrumentation.
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Transparencies
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