[SLAC] [SLAC Pubs and Reports]

A Four-Port Launcher for a Multi-Moded DLDS Power Distribution System


We describe a structure for launching the TE01 and both polarizations of TE12 modes into a highly overmoded low loss circular waveguide providing remote transmission for a multi-moded Delay Line Distribution System (DLDS). The power from four sources is delivered to four structure ports by rectangular waveguide, and the mode for each pulse subsection is selected by varying the relative phases of the sources. The four ports symmetrically feed a section of waveguide with a fourfold symmetric four-leaf clover-like (or quatrefoil) cross section, dimensioned so as to propagate only four TE modes, characterized as 0, pi/2 (two polarizations), and pi modes. The 0 and pi/2 modes are well matched, the pi mode only moderately so. A low loss taper transforms the initial cross section to a circular cross section; the 0 mode transforming to TE01, the pi/2 to TE11, the p to TE21, all with negligible mode conversion. A "sausage" type mode transducer then converts TE11 to TE12 (a lower loss mode), and the diameter is then expanded to the full ~five inch diameter of the delay line. A separate structure to divert power from the last pulse subsection to the local group of accelerator structures is required.

Full Text


Compressed PostScript


The PostScript version of this paper appears upside-down when viewed on screen, though the file prints without problems. The PDF version previews right-side up.

More Information

Full bibliographic data for this document, including its complete author list, is (or soon will be) available from SLAC's SPIRES-HEP Database.

Please report problems with this file to posting@slac.stanford.edu. The SLAC preprint inventory is provided by the SLAC Technical Publications Department.
Page generated 04 Apr 2001 @ 15:08 PDT by htmlme.pl