NDLI: RF impedance measurements on the DARHT-II accelerator intercell assembly

Content Provider	IEEE Xplore Digital Library
Author	Fawley, W.M. Eylon, S. Briggs, R.
Copyright Year	2003
Description	Author affiliation: LBNL, Berkeley, CA (Fawley, W.M.; Eylon, S.)
Abstract	We report upon recent experimental measurements made of RF properties of the intercell assembly of the second axis accelerator of Dual Axis Radiographic Hydrodynamic Test (DARHT) facility at LANL The intercells provide both pumping and diagnostic access to the main DARHT-II beamline. Their design includes a pumping plenum separated from the main beam pipe by return current rods together with RF shielding provided by a copper-coated stainless steel mesh. Measurements using the twin lead technique at low frequencies (f les 200 MHz) suggest a constant value for the ratio eta of the radial and azimuthal magnetic field components to which the transverse impedance is linearly related. We find that these results compare favorably to predictions from a simple analytic, lumped circuit model which includes the effects of the mesh and return current rods. We also present RF loop-to-loop frequency scans above beam pipe cutoff (~600 MHz) showing the existence of many RF modes with relatively high Q's
Sponsorship	U.S. Dept. of Energy Office of Naval Res. Nat. Sci. Found
Starting Page	3098
Ending Page	3100
File Size	217686
Page Count	3
File Format	PDF
ISBN	0780377389
ISSN	10633928
DOI	10.1109/PAC.2003.1289826
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-05-12
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Radio frequency Impedance measurement Assembly Magnetic field measurement Life estimation Diagnostic radiography Hydrodynamics Testing Laser excitation Structural beams
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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