Bunch lengthening control using the fourth harmonic cavity in the VUV ring

Keane, J.; Buda, S.; D'Alsace, R.; Fauchet, A. M.; Ramirez, G.; Morf, Thomas; Wachtel, J.; Vignola, G.

doi:10.1109/pac.1989.73038

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Commissioning of a higher harmonic RF system for the Advanced Light Source

Byrd

Santis

Georgsson

et al. 2000

Nuclear Instruments and Methods in Physics Research Section A:

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We report on the commissioning of a higher harmonic RF system designed to improve the Touschek lifetime of the Advanced Light Source. In our best results, we have achieved over a factor of two increase in the beam lifetime. Transient beam loading of the harmonic cavities by unequal fill patterns presents the greatest limitations on lifetime improvement. We also describe several interesting effects of the harmonic cavities on the operation of the longitudinal and transverse multibunch feedback systems.

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Commissioning of a higher harmonic RF system for the Advanced Light Source

Byrd

Santis

Georgsson

et al. 2000

Nuclear Instruments and Methods in Physics Research Section A:

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Landau cavities at MAX II

Georgsson

Andersson

Eriksson

1998

Nuclear Instruments and Methods in Physics Research Section A:

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Passive Landau cavities have been built, installed and taken into regular operation in the MAX II ring. The purpose of the Landau damping system is twofold: to decrease the energy spread of the beam induced by coupled bunch oscillations and to increase the Touschek life-time. The cavities are of the pillbox type operated at 1500 MHz, the third harmonic of the main RF. This paper describes the design and operational results of the cavities.

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