High power testing of a fused quartz-based dielectricloaded accelerating structure

Jing, C.; Techlabs, Euclid; Power, John; Konecny, R.; Gai, W.; Yusof, Z.; Gold, Steven H.; Kinkead, A. K.; Dolgashev, Valery; Tantawi, Sami

doi:10.1109/pac.2007.4440700

Cited by 2 publications

(1 citation statement)

References 3 publications

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“…The onset of multipactor discharges at dielectric surfaces exposed to high electric field strengths has been studied extensively theoretically [38][39][40][41][42]. Previous experimental research on dielectric accelerator structures at X-Band has reported the onset of multipactor effects at gradients in the MV=m range [43][44][45][46][47]. The present experiments have the additional factor of having a triple point at the location where the rods enter the supporting copper plates [31].…”

Section: Dark Current and Light Emissionmentioning

confidence: 78%

High power experimental studies of hybrid photonic band gap accelerator structures

Zhang

Munroe

et al. 2016

Phys. Rev. Accel. Beams

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This paper reports the first high power tests of hybrid photonic band gap (PBG) accelerator structures. Three hybrid PBG (HPBG) structures were designed, built and tested at 17.14 GHz. Each structure had a triangular lattice array with 60 inner sapphire rods and 24 outer copper rods sandwiched between copper disks. The dielectric PBG band gap map allows the unique feature of overmoded operation in a TM 02 mode, with suppression of both lower order modes, such as the TM 11 mode, as well as higher order modes. The use of sapphire rods, which have negligible dielectric loss, required inclusion of the dielectric birefringence in the design. The three structures were designed to sequentially reduce the peak surface electric field. Simulations showed relatively high surface fields at the triple point as well as in any gaps between components in the clamped assembly. The third structure used sapphire rods with small pin extensions at each end and obtained the highest gradient of 19 MV=m, corresponding to a surface electric field of 78 MV=m, with a breakdown probability of 5 × 10 −1 per pulse per meter for a 100-ns input power pulse. Operation at a gradient above 20 MV=m led to runaway breakdowns with extensive light emission and eventual damage. For all three structures, multipactor light emission was observed at gradients well below the breakdown threshold. This research indicated that multipactor triggered at the triple point limited the operational gradient of the hybrid structure.

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Section: Dark Current and Light Emissionmentioning

confidence: 78%

High power experimental studies of hybrid photonic band gap accelerator structures

Zhang

Munroe

et al. 2016

Phys. Rev. Accel. Beams

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Development of a dielectric-loaded test accelerator

Gold

Kinkead²,

Gai

et al. 2007

2007 IEEE Particle Accelerator Conference (PAC)

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1This paper presents a progress report on a joint project by the Naval Research Laboratory (NRL) and Argonne National Laboratory (ANL), in collaboration with the Stanford Linear Accelerator Center (SLAC) and Euclid Techlabs, LLC, to develop an X-band dielectric-loaded test accelerator in the NRL Magnicon Facility. The magnicon is a high-power 11.4-GHz amplifier tube that can produce up to 25 MW of power in 200-ns pulses at up to 10 Hz. The dielectric accelerating structures are developed by ANL and Euclid Techlabs, and tested at NRL and SLAC. The accelerator will include a 5-MeV electron injector developed by the Accelerator Laboratory of Tsinghua University, Beijing, China. SLAC has developed a means to combine the two magnicon output arms, in order to drive an injector and accelerator with separate control of the power ratio and relative phase. The initial operation of the injector should take place later this year, and the first test with a DLA structure, and a spectrometer should take place within the next year.

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High power testing of a fused quartz-based dielectricloaded accelerating structure

Cited by 2 publications

References 3 publications

High power experimental studies of hybrid photonic band gap accelerator structures

High power experimental studies of hybrid photonic band gap accelerator structures

Development of a dielectric-loaded test accelerator

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