Stanford High-Energy Linear Electron Accelerator (Mark III)

We present the theoretical analysis and computer simulation of the wakefields in a 17 GHz photonic band-gap (PBG) structure for accelerator applications. Using the commercial code CST PARTICLE STUDIO, the fundamental accelerating mode and dipole modes are excited by passing an 18 MeV electron beam through a seven-cell traveling-wave PBG structure. The characteristics of the longitudinal and transverse wakefields, wake potential spectrum, dipole mode distribution, and their quality factors are calculated and analyzed theoretically. Unlike in conventional disk-loaded waveguide (DLW) structures, three dipole modes (TM 11 -like, TM 12 -like, and TM 13 -like) are excited in the PBG structure with comparable initial amplitudes. These modes are separated by less than 4 GHz in frequency and are damped quickly due to low radiative Q factors. Simulations verify that a PBG structure provides wakefield damping relative to a DLW structure. Simulations were done with both single-bunch excitation to determine the frequency spectrum of the wakefields and multibunch excitation to compare to wakefield measurements taken at MIT using a 17 GHz bunch train. These simulation results will guide the design of next-generation highgradient accelerator PBG structures.

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“…I can be described as a function of frequency (! ), group velocity (V g ), and quality factor (Q) of the structure [30]:…”

Section: Multibunch Simulation and Beam Loading Calculationmentioning

confidence: 99%

Calculation of wakefields in a 17 GHz beam-driven photonic band-gap accelerator structure

Munroe

Shapiro

et al. 2013

Phys. Rev. ST Accel. Beams

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“…Historically there have been four approaches to the problem of higher-modes in accelerating structures: [1] ignore them, [2] use lower intensity beams, and a stronger magnetic lattice, [3] damp and detune them, and/or [4] employ them for structure alignment. The first approach was tried on the Two-Mile Accelerator, the Livermore Advanced Test Accelerator (ATA), and later again on the Stanford Linear Collider (SLC).…”

Section: Advanced Structure Conceptsmentioning

confidence: 99%

“…2 depicts a resonant line coupled by means of fast switches to a series of parallel transmission lines composed of accelerator cavities. Operation consists of three steps: [1] resonant filling of the primary line with mm-wave power P 1 , provided by an external power source on the natural field decrement time scale of 10 -8 s [2] rapid closing of the switches on a time scale well under 10 -9 s [3] propagation of a short sub-nanosecond burst of mm-waves down the secondary line, as single electron bunches arrive in parallel, to be accelerated as they pass through each secondary line, roughly orthogonal to the direction of mm-wave propagation. A detailed treatment of this concept has been given in work with Tantawi (68), with the geometrical implementation of Fig.…”

Section: λ With Beam Ports [ / ]mentioning

confidence: 99%

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Ultimate gradient in solid-state accelerators

Whittum

1999

AIP Conference Proceedings

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We recall the motivation for research in high-gradient acceleration and the problems posed by a compact collider. We summarize the phenomena known to appear in operation of a solid-state structure with large fields, and research relevant to the question of the ultimate gradient. We take note of new concepts, and examine one in detail, a miniature particle accelerator based on an active millimeter-wave circuit and parallel particle beams. Baltimore, Maryland July 5-11, 1998 Work supported by U.S. Abstract. We recall the motivation for research in high-gradient acceleration and the problems posed by a compact collider. We summarize the phenomena known to appear in operation of a solid-state structure with large fields, and research relevant to the question of the ultimate gradient. We take note of new concepts, and examine one in detail, a miniature particle accelerator based on an active millimeter-wave circuit and parallel particle beams. Invited talk presented at the 8th Workshop on Advanced Accelerator Concepts

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“…9). 20 It was the first multi-megawatt microwave source of any kind. In the next 50 years, there would be many more advances, but none as impressive or as widely imitated.…”

Section: Historymentioning

confidence: 99%

The klystron: A microwave source of surprising range and endurance

Caryotakis

1998

Physics of Plasmas

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This year marks the 60 th anniversary of the birth of the klystron at Stanford University. The tube was the first practical source of microwaves and its invention initiated a search for increasingly more powerful sources, which continues to this day. This paper reviews the scientific uses of the klystron and outlines its operating principles. The history of the device is traced, from its scientific beginnings, to its role in WWII and the Cold War, and to its current resurgence as the key component in a major accelerator project. Finally, the paper describes the development of a modular klystron, which may someday power future accelerators at millimeter wavelengths.

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Stanford High-Energy Linear Electron Accelerator (Mark III)

Cited by 120 publications

References 36 publications

Calculation of wakefields in a 17 GHz beam-driven photonic band-gap accelerator structure

Calculation of wakefields in a 17 GHz beam-driven photonic band-gap accelerator structure

Ultimate gradient in solid-state accelerators

The klystron: A microwave source of surprising range and endurance

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