CERN SL/92-15 (DI), PS/92-24 (RF/AR), LHC note 186 (1992) and Proc. EPAC
Conference, Berlin, 1992, eds. H. Henke, H. Homeyer and Ch. Petit-Jean-Genaz
(Editions Frontières, Singapore, 1992), pp. 889-891
Next: EXPERIMENTAL SETUP AND
Impedance measurements
for the pumping holes in the LHC liner
F. Caspers, E. Jensen and F. Ruggiero
March 1992
Abstract:
We report the results of impedance measurements, performed by
the triaxial wire method, on a 2 m long model of the LHC vacuum chamber.
The model consists of an inner screen (liner) with pumping holes
and of the outer vacuum chamber.
The transmission coefficient for different numbers of
holes with various radii
confirms the role played by TEM modes, propagating at the same speed of
the beam particles in the coaxial structure formed by the liner and
the outer vacuum chamber.
We also compare the results of these measurements to
analytical estimates of the coupling impedance.
F. Ruggiero
Thu Sep 12 20:20:16 METDST 1996