Abstracts Brochure - CERN

MOPCH170
MOPCH171
MOPCH172
26-Jun-06 16:00 - 18:00 MOPCH — Poster Session
(surface status, oxide formation, corrosion, etc) of the water interaction with the niobium surface. Furthermore a new
analysis, based on the luminescence induced on transparent dielectric samples, is used for confirmation of the water
jet structure.
Experimental and Theoretical Analysis of the Tesla-like SRF Cavity Connection Flanges
In view of the future large SC accelerator,
L. Monaco, P. Michelato, C. Pagani, N. Panzeri (INFN/LASA) an improvement of the reliability and a cost
reduction of the SRF cavities cold flanges is
required. In this paper, a critical analysis of the TESLA-like cold connection flanges at room and at cryogenic
temperature is presented. This analysis is based on experimental characterization of the mechanical properties of the
joint and of the leak rates during the sealing process. A FEM model, that agrees with the experimental data, is also
presented. This model is being used for the optimization of the present SRF flanges and the development of new cold
connections.
ILC Coaxial Blade Tuner
C. Pagani, A. Bosotti, P. Michelato, N. Panzeri, R. Paparella, P. Pierini
(INFN/LASA)
98
A coaxial (blade) tuner solution has been developed
for the compensation of the Lorentz
force detuning of the superconducting cavities
under the high gradient pulsed operation
foreseen for ILC operation. The device is based on prototypes successfully tested at DESY in 2002 both on CHECHIA
and on the superstructures inserted in the TTF string. During both tests the blade tuner performed as expected in
terms of stiffness, frequency sensitivity and tuning capabilities. An improvement of the tuner characteristics has been
designed by the integration of fast tuning capabilities by means of piezo-ceramic element. Two prototipes of the new
INFN coaxial piezo blade tuner have just been manufactured and they will be tested at DESY and BESSY after the
cavity integration. In this paper the blade tuner design and main characteristics are presented, together with the early
interpretation of the cold test results.
A Superconducting Deflecting Structure Design for the Advanced Light Source at LBNL
J. Shi, H. Chen, S. Zheng (TUB) J.M. Byrd, D. Li (LBNL) R.A.
Rimmer (Jefferson Lab)
Deflecting RF cavities may be used to generate
sub-pico-second x-rays by creating longitudinal
and transverse correlations within
electron bunches. Up to 2-MV deflecting
voltage at 1.5-GHz is required for 1.9-GeV electron beam at the Advanced Light Source (ALS) in Lawrence Berkeley
National Laboratory (LBNL). In this paper, we present a design for a superconducting deflecting structure with input
RF coupler and waveguide ports for damping lower and higher order modes (LOM and HOM). The structure has
4 deflecting cells with in a 2-by-2 configuration allowing RF couplers and damping ports to be placed in between.
Several damping schemes for LOM and HOM modes are presented and simulated. An aluminum cold model was
built. Measurements and simulation results will be compared.