Abstracts Brochure - CERN

TUYPA01
TUYPA02
TUYPA03
27-Jun-06 11:00 - 12:30 TUYPA — Beam Instrumentation and Feedback
TUYPA — Beam Instrumentation and Feedback
Femtosecond Bunch Length Measurements
S.P. Jamison (CCLRC/DL/ASTeC) G. Berden (FOM Rijnhuizen)
W.A. Gillespie, P.J. Phillips (University of Dundee) A. MacLeod
(UAD)
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.
High Precision SC Cavity Alignment Diagnostics with HOM Measurements
J.C. Frisch, J. May, D.J. McCormick, M.C. Ross, T.J. Smith (SLAC) N.
Baboi, O. Hensler, L.M. Petrosyan (DESY) O. Napoly, R. Paparella,
C. Simon (CEA)
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.
Developments in Beam Instrumentation and New Feedback Systems for the ILC
H. Hayano (KEK)
ments that address these challenges for ILC beam instrumentation.
This presentation will review the challenging
beam properties that need to be measured
and controlled and new diagnostic develop-
150 Chair: M.G. Minty (DESY, Hamburg)