Linear Accelerator Modeling: Development and Application

Jameson, Robert; Jule, W.E.

doi:10.1109/tns.1977.4328983

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1978

1979

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“…where v bead is the volume of the bead and t is the permittivity. Solving for E and substituting in the equation for R/Q yields (1) The phase shift between an if drive to the cavity and the cavity field as a function of the oscillation frequency is 13 tan c = Substituting for Af yields a relation for R directly. This phase bead-pull measurement can be made using the modified bead-pull apparatus shown in Fig.…”

Section: Edz T mentioning

confidence: 99%

LAMPF 201. 25-MHz linac field distribution

Jameson¹,

Halbig²

1978

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Retuning of the 201.25-MHz accelerator structure field distributions after the 1975 shutdown is described and final data are given for use in beam dynamics studies. Several improvements made in procedures included a different method for stopband closure check and a positive method for postcoupler clamping. We found that to obtain accurate results for the first tank we had to use a rigorous data reduction technique that included the removal of a "signature" due to the bead-pull string itself. Other special studies are reported, including the effects of vacuum, bead size, slug tuners, and a bead-pull method for measuring the cavity quality factor Q.

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Section: Edz T mentioning

confidence: 99%