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Sato, K.

Paper Title Page
WEPD064 New Multiconductor Transmission-line Theory and the Origin of Electromagnetic Noise 3245
 
  • H. Toki, K. Sato
    RCNP, Osaka
  
 

The or­di­nary elec­tric cir­cuits pro­duce and re­ceive elec­tro­mag­net­ic noise. The noise is a prob­lem for sta­ble op­er­a­tion of syn­chrotron ac­cel­er­a­tors. We do not know the ori­gin of the noise gen­er­a­tion due to the lack of elec­tric cir­cuit the­o­ry, which takes into ac­count the noise sources. The prop­er treat­ment of elec­tric cir­cuit to­geth­er with noise re­quires a prop­er knowl­edge of mul­ti­con­duc­tor trans­mis­sion-line the­o­ry. We have de­vel­oped a new mul­ti­con­duc­tor trans­mis­sion-line the­o­ry in which we are able to de­scribe the per­for­mance of mul­ti­con­duc­tor trans­mis­sion-line sys­tem*. In this the­o­ry, it is es­sen­tial to use the co­ef­fi­cients of po­ten­tial in­stead of ca­pac­i­ties and the in­tro­duc­tion of the nor­mal and com­mon modes. After un­der­stand­ing the mul­ti­con­duc­tor trans­mis­sion-line the­o­ry, we pro­pose the in­tro­duc­tion of the mid­dle line (three lines) and sym­met­ric ar­range­ments of elec­tric loads**. The use of this con­cept made the J-PARC MR suc­cess­ful in op­er­a­tion.


* H. Toki and K. Sato, J. Phys. Soc. Jpn 78 (2009) 094201.
** K. Sato and H. Toki, Nucl. Inst. Methods A565 (2006) 351.

  
THPEA024 Duct-Shaped SiC Dummy Load of L-band Power Distribution System for XFEL/SPring-8 3729
 
  • J. Watanabe, S. Kimura, K. Sato
    Toshiba, Yokohama
  • T. Asaka, H. Ego, H. Hanaki
    JASRI/SPring-8, Hyogo-ken
  
 

TOSHI­BA is man­u­fac­tur­ing the L-band ac­cel­er­a­tion sys­tem for the SPring-8 Joint Pro­ject for XFEL. We have de­vel­oped a new type duct-shaped SiC dummy load for its power dis­tri­bu­tion sys­tem. The load ter­mi­nates a WR650 waveg­uide and can ab­sorb the max­i­mum mean power of 10kW. In order to re­duce VSWR less than 1.1 in the fre­quen­cy range of 1.428GHz, we shaped the SiC ab­sorber into a 35cm long ta­pered cylin­der and mount­ed match­ing stubs in the waveg­uide near the inlet of the load. The SiC ab­sorber was fit into a cylin­dri­cal cop­per with ef­fi­cient wa­ter-cool­ing chan­nels. The de­sign and man­u­fac­ture and the low-pow­er tests of our orig­i­nal dummy load are de­scribed in this paper.