RF impedance measurements on the DARHT-II accelerator intercell assembly

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We report upon recent experimental measurements made of RF properties of the intercell assembly of the second axis accelerator[1] 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 (see Ref. [2]) at low frequencies (f < 200 MHz) suggest a constant value for the ratio h of the radial and azimuthal magnetic field ... continued below

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Fawley, William M.; Eylon, Shmuel & Briggs, Richard May 5, 2003.

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We report upon recent experimental measurements made of RF properties of the intercell assembly of the second axis accelerator[1] 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 (see Ref. [2]) at low frequencies (f < 200 MHz) suggest a constant value for the ratio h 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 ({approx}600 MHz) showing the existence of many RF modes with relatively high Q's.

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INIS; OSTI as DE00813384

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  • 2003 Particle Accelerator Conference, Portland, OR (US), 05/12/2003--05/16/2003

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  • Report No.: LBNL--52595
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 813384
  • Archival Resource Key: ark:/67531/metadc737714

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  • May 5, 2003

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  • Oct. 18, 2015, 6:40 p.m.

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  • May 16, 2016, 11:38 a.m.

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Fawley, William M.; Eylon, Shmuel & Briggs, Richard. RF impedance measurements on the DARHT-II accelerator intercell assembly, article, May 5, 2003; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc737714/: accessed December 14, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.