Development of a dual-layered dielectric-loaded accelerating structure

Jing, Chunguang; Kanareykin, A.; Kazakov, S.; Liu, Wanming; Nenasheva, Elizaveta; Schoessow, P.; Gai, W.

doi:10.1016/j.nima.2008.06.037

Cited by 14 publications

(7 citation statements)

References 16 publications

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“…For example, fused silica, chemical vapor deposition (CVD) diamond, alumina and other ceramics have been proposed as materials for DLA structures [36][37][38], and experimentally tested with high-power wakefield accelerating structures at Argonne National Laboratory [39][40][41][42]. In the last two decades, different kinds of DLA structures with improved performance have been reported, such as a dual-layered dielectric structure [43], a hybrid dielectric and iris-loaded accelerating structure [44], a multilayered dielectric structure [45], a disk-and-ring tapered accelerating structure [46], and a dielectric disk accelerating (DDA) structure [47]. Among these DLA structures, a dielectric assist accelerating (DAA) structure proposed by Satoh et al [48][49] is of particular interest because it realized an extremely high quality factor and a very high shunt impedance at a C-band frequency.…”

Section: Introductionmentioning

confidence: 99%

Investigations Into X-Band Dielectric Assist Accelerating Structures for Future Linear Accelerators

Wei

2021

IEEE Trans. Nucl. Sci.

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Dielectric assist accelerating (DAA) structures are being studied as an alternative to conventional disk-loaded copper structures. This paper investigates numerically an efficient Xband DAA structure operating in a higher order mode of TM02-π. This accelerating structure consists of dielectric disks with irises arranged periodically in a metallic enclosure. Through optimizations, the RF power loss on the metallic wall can be significantly reduced, resulting in an extremely high quality factor = and a very high shunt impedance ′ = MΩ/m. The RF-to-beam power efficiency reaches 51% which is significantly higher than previously-reported CLIC-G structures with an efficiency of only 33.5%. The optimum geometry of the regular and the end cells is described in detail. Due to the wide bandwidth from the dispersion relation of the accelerating mode, the DAA structure is allowed to have a maximum number of 72 regular cells with a frequency separation of 1.0 MHz, which is superior to that of conventional disk-loaded copper structures. In addition, the DAA structure is found to have a short-range transverse wakefield lower than that of the CLIC-G structure.

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Section: Introductionmentioning

confidence: 99%

Investigations Into X-Band Dielectric Assist Accelerating Structures for Future Linear Accelerators

Wei

2021

IEEE Trans. Nucl. Sci.

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“…In order to improve the gradient, efficiency, and cost of a TBA collider, various novel accelerating/decelerating structures have been studied: metallic two-halves structure [20,29,30], dielectric-loaded structure (DLS) [12][13][14][15]19], metameterial structure [26,31,32], photonic band gap structure [33][34][35], and many others [16,23,25,[36][37][38][39][40][41]. Among them, the DLS is a very attractive candidate for a TBA collider due of its simple geometry, low fabrication cost, high group velocity with reasonable shunt impedance, and potential to withstand GV/m gradient.…”

Section: Introductionmentioning

confidence: 99%

Development and high-power testing of an X -band dielectric-loaded power extractor

Shao

Jing

Wisniewski

et al. 2020

Phys. Rev. Accel. Beams

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Dielectric loaded structures are promising candidates for use in the structure wakefield acceleration (SWFA) technique, for both the collinear wakefield and the two-beam acceleration (CWA and TBA respectively) approaches, due to their low fabrication cost, low rf losses, and the potential to withstand high gradient. A short pulse (≤20 ns) TBA program is under development at the Argonne Wakefield Accelerator (AWA) facility where dielectric loaded structures are being used for both the power extractor/transfer structure (PETS) and the accelerator. In this study, an X-band 11.7 GHz dielectric PETS was developed and tested at the AWA facility to demonstrate high power wakefield generation. The PETS was driven by a train of eight electron bunches separated by 769.2 ps (9 times of the X-band rf period) in order to achieve coherent wakefield superposition. A total train charge of 360 nC was passed through the PETS structure to generate ∼200 MW, ∼3 ns flat-top rf pulses without rf breakdown. A future experiment is being planned to increase the generated rf power to approximately ∼1 GW by optimizing the structure design and improving the drive beam quality.

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“…Since the basic theory of DLA structures were first proposed in the 1940s [16][17][18], numerous studies have examined the use of dielectric materials in accelerating structures [19][20][21][22][23][24][25][26][27]. Recently, new concepts of dielectric based accelerating structures with improved performance have come along, such as a dual-layered DLA structure [21], a hybrid dielectric and iris loaded periodic accelerating structure [22], a multicell disk-and-ring tapered structure [23,24], an over-mode hybrid photonic band gap accelerating structure [25], and a multilayered DLA structure [26,27] which is operated by a higher order mode. Thus, the possibilities of dielectric based accelerating structures are gradually expanding.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and cold test of dielectric assist accelerating structure

Satoh

Yoshida

Hayashizaki

2017

Phys. Rev. Accel. Beams

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We present the detailed description of a successful design and cold testing of the dielectric assist accelerating (DAA) structure. The DAA structure consists of ultralow-loss dielectric cylinders and disks with irises which are periodically arranged in a metallic enclosure. The advantage of the DAA structure is that it has an extremely high quality factor and a very high shunt impedance at room temperature since the electromagnetic field distribution of accelerating mode can be controlled by dielectric parts so that the wall loss on the metallic surface is greatly reduced. A prototype of the five-cell DAA structure was designed and built at C-band (5.712 GHz), and cold tested. Three types of dielectric cell structure, "regular," "end," and "hybrid" dielectric cells, are fabricated by sintering high-purity magnesia. The prototype was assembled by stacking these cells in the hollow copper cylinder, whose two ends are closed by copper plates. The resonant frequency of the prototype was tuned to the desired frequency by machining only end copper plates. The unloaded quality factor of the accelerating mode was measured at 119,314 and the shunt impedance per unit length of the prototype was estimated from the experimental results of the bead pull measurement as Z sh ¼ 617 MΩ=m, which were within 2 percent of the design values. The field distribution of accelerating mode was also measured by the bead pull method, and its results agreed well with simulation results.

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Development of a dual-layered dielectric-loaded accelerating structure

Cited by 14 publications

References 16 publications

Investigations Into X-Band Dielectric Assist Accelerating Structures for Future Linear Accelerators

Investigations Into X-Band Dielectric Assist Accelerating Structures for Future Linear Accelerators

Development and high-power testing of an X -band dielectric-loaded power extractor

Fabrication and cold test of dielectric assist accelerating structure

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