&lt;title&gt;Design consideration of relativistic klystron two-beam accelerator for suppression of beam break-up&lt;/title&gt;

Li, Hai; Houck, T.; Yu, S.S.; Goffeney, N.

doi:10.1117/12.175735

Cited by 3 publications

(2 citation statements)

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“…The concept was again rediscovered in simulations during a design study of an RK-TBA where the cavities were fortuitously spaced at =2 [3,7]. The main power extraction section of an RK uses strong focusing to transport the beam through small aperture rf output cavities and the beam energy is cyclic with respect to the cavities.…”

Section: Betatron Node Schemementioning

confidence: 99%

Beam dynamics experiments to study the suppression of transverse instabilities

Houck

Lidia²

2003

Phys. Rev. ST Accel. Beams

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Two-beam accelerators based upon relativistic klystron's (RK's) have been proposed as power sources for future generation linear electron-positron colliders. These drivers are susceptible to several transverse beam breakup (BBU) instabilities. An experiment to study a particular technique (the ''betatron node scheme'') for ameliorating the high-frequency BBU has been performed at LBNL on a 1 MeV, 500 A induction accelerator beam. The results of this experiment are particularly important for RK, but apply to any system where the betatron phase advance between perturbing structures is an integral multiple of 180 . This phase advance is beneficial in linear accelerators as the instability growth changes from exponential to linear. In the experiment described below, the beam is contained in a solenoidal focusing channel, rf cavities are spaced every 60 cm, and growth in the transverse motion was measured as a function of phase advance. Details of the experiment and results are presented.

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Section: Betatron Node Schemementioning

confidence: 99%

Beam dynamics experiments to study the suppression of transverse instabilities

Houck

Lidia²

2003

Phys. Rev. ST Accel. Beams

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“…The reduction in growth of the transverse instability was noted in simulations during a design study of an RK-TBA where the cavities were fortuitously spaced at λ β /2. This led to further simulations to study the effects of cavity length, errors in phase advance, and beam energy or focusing variations [6].…”

Section: Betatron Node Schemementioning

confidence: 99%

Beam dynamics experiments in support of relativistic klystrons

Houck

Lidia²

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)

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Experiments to study beam dynamics for Relativistic Klystrons (RK) are being performed with a 1-MeV, 600-A induction accelerator beam. The RK is a RF Power source based on induction accelerator technology and conventional resonant output structures. Capable of generating 100's of MW/m at frequencies up to K-band, the RK has been proposed as a driver for a future linear collider in one version of a Two-Beam Accelerator. A critical feasibility issue remaining to be demonstrated is suppression of the transverse instability of the drive beam. This kiloampere beam must transit about a hundred resonance output structures and many hundreds of induction accelerator cavities for the RK to achieve competitive efficiency and cost with respect to other proposed power sources. The RK's strong focusing used to contain the beam in the small aperture resonant structures, repetitive geometry, and reacceleration allow the resonant output structures to be spaced at a betatron phase advance of 360°. This phase advance (or any integral multiple of 180°) is beneficial in linear accelerators as the instability growth changes from exponential to linear. In our experiment the beam is contained in a solenoidal focusing channel, RF cavities are spaced every 60 cm, and growth in the transverse motion is measured as a function of phase advance. Details of the experiments and results are presented.

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