The Choke Mode Cavity

Shintake, T.

doi:10.1143/jjap.31.l1567

Cited by 67 publications

(38 citation statements)

References 1 publication

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“…Typically, during normal operation n d is in the range 2 Â 10 10 to 3 Â 10 10 . In this manner the wakefield has been measured for C-band [27][28][29][30][31][32][33], X-band [22,[34][35][36][37], and K u -band [38] accelerating structures.…”

Section: A Wakefield Measurementmentioning

confidence: 99%

“…The choke mode [27][28][29][30][31][32][33] damping scheme, operating with a 3=4 phase advance per cell, has shown particular promise in damping transverse wakefields in C-band accelerating structures and is successfully operating with accelerating gradients of 37 MV=m at Spring-8 [50] in Japan. A CAD drawing illustrating the main features of the choke mode accelerator is illustrated in Fig.…”

Section: Wakefield Suppression At C-bandmentioning

confidence: 99%

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Wakefield suppression in high gradient linacs for lepton linear colliders

Jones

2009

Phys. Rev. ST Accel. Beams

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The transverse wakefield excited by multiple bunches in ultrarelativistic charged particle beams in a linear collider must be adequately damped in order to preserve the luminosity of the colliding beams and to prevent a beam breakup instability developing. A review of the means of achieving this wakefield suppression is discussed in detail for normal conducting linacs utilized for linear colliders. In particular, the features of a damped and detuned series of structures are described and compared to other methods. A conspectus of experimental results along with theoretical predictions for this series of accelerating structures developed for the next-linear-collider/global-linear-collider is presented together with the prospects for wakefield suppression for the compact linear collider.

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Section: A Wakefield Measurementmentioning

confidence: 99%

Section: Wakefield Suppression At C-bandmentioning

confidence: 99%

Wakefield suppression in high gradient linacs for lepton linear colliders

Jones

2009

Phys. Rev. ST Accel. Beams

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“…Detuning was first employed on the Two-Mile linac, and involved detuning three cells of each 86-cell structure in a number of sectors in the linac (71). Damping was first employed operationally, and successfully on the Livermore induction linacs, ETA and ATA (72), later appearing in the choke-mode geometry of T. Shintake (73), and a travelling-wave structure ("DDS") that accomplishes both damping and detuning (74). The fourth approach was tried on ATA, the two-mile linac (75), and, most recently on the DDS structure, where M. Seidel, et al, provided the first definitive measurements of "absolute beam position" in a microwave linac (76).…”

Section: Advanced Structure Conceptsmentioning

confidence: 99%

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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“…Single cell testing has advantages over testing extended structures, e.g., the smaller structures require less power for testing, and are much easier to fabricate and tune. To date, more than 30 structures have been tested at SLAC, of varying iris aperture and geometry, different materials, and widely diverging geometries including choke mode structures [21] and this first PBG structure test.…”

Section: Introductionmentioning

confidence: 99%

X-band photonic band-gap accelerator structure breakdown experiment

Marsh

Shapiro

Temkin

et al. 2011

Phys. Rev. ST Accel. Beams

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In order to understand the performance of photonic band-gap (PBG) structures under realistic high gradient, high power, high repetition rate operation, a PBG accelerator structure was designed and tested at X band (11.424 GHz). The structure consisted of a single test cell with matching cells before and after the structure. The design followed principles previously established in testing a series of conventional pillbox structures. The PBG structure was tested at an accelerating gradient of 65 MV=m yielding a breakdown rate of two breakdowns per hour at 60 Hz. An accelerating gradient above 110 MV=m was demonstrated at a higher breakdown rate. Significant pulsed heating occurred on the surface of the inner rods of the PBG structure, with a temperature rise of 85 K estimated when operating in 100 ns pulses at a gradient of 100 MV=m and a surface magnetic field of 890 kA=m. A temperature rise of up to 250 K was estimated for some shots. The iris surfaces, the location of peak electric field, surprisingly had no damage, but the inner rods, the location of the peak magnetic fields and a large temperature rise, had significant damage. Breakdown in accelerator structures is generally understood in terms of electric field effects. These PBG structure results highlight the unexpected role of magnetic fields in breakdown. The hypothesis is presented that the moderate level electric field on the inner rods, about 14 MV=m, is enhanced at small tips and projections caused by pulsed heating, leading to breakdown. Future PBG structures should be built to minimize pulsed surface heating and temperature rise.

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The Choke Mode Cavity

Cited by 67 publications

References 1 publication

Wakefield suppression in high gradient linacs for lepton linear colliders

Wakefield suppression in high gradient linacs for lepton linear colliders

Ultimate gradient in solid-state accelerators

X-band photonic band-gap accelerator structure breakdown experiment

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