Speaker
Description
A third harmonic system is planned for PETRA IV. One possible option for the third harmonic cavity is a novel single-mode cavity based on the choke-mode principle. The DESY device developed on this basis offers the following advantages over alternative designs:
a) Very strong suppression of all unwanted modes.
b) Coupling factor adjustable during operation.
c) The wall currents induced by the fundamental mode are not disturbed by weld seams. This has a favourable effect on the shunt impedance and quality factor.
d) The simple geometry of the cavity results in the smallest possible number of independent cooling circuits.
The presentation describes the development work, introduces the design and highlights some of the cavity's outstanding features. It a also discusses the current construction of the cavity.
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