Multibunch beam extraction using the strip-line kicker at the KEK Accelerator Test Facility

Naito, Takashi; Araki, S.; Hayano, H.; Kubo, K.; Kuroda, S.; Terunuma, N.; Okugi, T.; Urakawa, J.

doi:10.1103/physrevstab.14.051002

Cited by 17 publications

(7 citation statements)

References 4 publications

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“…Injection and extraction stripline kickers have already been used for fast injection/extraction applications, such as bunch-by-bunch manipulation, with a field rise time of a few ns. This is the case of the tapered striplines designed for the injection upgrade of the Φ factory DAΦNE [7], as well as the kicker system proposed for the ILC DR beam extraction [8]: both designs allow for field rise times below 6 ns. For the CLIC DR extraction kicker, the curved and tapered electrodes used in DAΦNE would give higher field inhomogeneity than is permissible.…”

Section: Design Of the Stripline Geometrymentioning

confidence: 99%

“…In [7][8][9][10] only the deflecting (odd) mode has been optimized to have 50 Ω characteristic impedance, therefore obtaining a good power transmission. Optimizing the nondeflecting (even) mode of the striplines will reduce the beam coupling impedance.…”

Section: Design Of the Stripline Geometrymentioning

confidence: 99%

“…The most common electrode shapes for striplines, used in kickers, are flat and curved electrodes [7][8][9][10][11]. Flat electrodes show good field homogeneity, whereas curved electrodes may allow for a better impedance matching between the two operation modes, but with poorer field homogeneity.…”

Section: A Characteristic Impedance and Field Homogeneity Optimizationmentioning

confidence: 99%

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Stripline design for the extraction kicker of Compact Linear Collider damping rings

Belver-Aguilar¹,

Faus‐Golfe²,

Toral³

et al. 2014

Phys. Rev. ST Accel. Beams

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In the framework of the design study of future linear colliders, the Compact Linear Collider (CLIC) aims for electron-positron collisions with high luminosity at a nominal center-of-mass energy of 3 TeV. To achieve the luminosity requirements, predamping rings (PDRs) and damping rings (DRs) are required: they reduce the beam emittance before the beam is accelerated in the main linac. Several kicker systems are needed to inject and extract the beam from the PDRs and DRs. In order to achieve both low beam coupling impedance and reasonable broadband impedance matching to the electrical circuit, striplines have been chosen for the kicker elements. In this paper, we present the complete design of the striplines for the DR extraction kicker, since it is the most challenging from the field homogeneity point of view. The excellent field homogeneity required, as well as a good transmission of the high voltage pulse through the electrodes, has been achieved by choosing a novel electrode shape. With this new geometry, it has been possible to benefit from all the advantages that the most common shapes introduce separately. Furthermore, a detailed study of the different operating modes of a stripline kicker allowed the beam coupling impedance to be reduced at low frequencies: this cannot be achieved by tapering the electrodes. The optimum design of the striplines and their components has been based on studies of impedance matching, field homogeneity, power transmission, beam coupling impedance, and manufacturing tolerances. Finally, new ideas for further improvement of the performance of future striplines are reported.

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Section: Design Of the Stripline Geometrymentioning

confidence: 99%

Section: Design Of the Stripline Geometrymentioning

confidence: 99%

Section: A Characteristic Impedance and Field Homogeneity Optimizationmentioning

confidence: 99%

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Stripline design for the extraction kicker of Compact Linear Collider damping rings

Belver-Aguilar¹,

Faus‐Golfe²,

Toral³

et al. 2014

Phys. Rev. ST Accel. Beams

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“…The positron production complex -see Fig. The above injection/extraction manipulations will require fast kickers with 4 ns EM pulse duration, similar to ones developed and tested for TESLA and ILC colliders [14,15].…”

Section: Theorymentioning

confidence: 99%

DIMUS: Super-Compact Dimuonium Spectroscopy Collider at Fermilab

Fox¹,

Jindariani²,

Shiltsev³

2022

Preprint

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While dimuonium (µ + µ − ) -the "smallest QED atom" -has not yet been observed, it is of utmost fundamental interest. By virtue of the larger mass, dimuonium has greater sensitivity to beyond the standard model (BSM) effects than its cousins positronium or muonium, both discovered long ago, while not suffering from large QCD uncertainties. Dimuonium atoms can be created in e + e − collisions with large longitudinal momentum, allowing them to decay a small distance away from the beam crossing point and avoid prompt backgrounds. We envision a unique cost-effective and fast-timeline opportunity for copious production of (µ + µ − ) atoms at the production threshold via a modest modification of Fermilab's existing FAST/NML facility to arrange collisions of 408 MeV electrons and positrons at a 75 o angle. This compact 23 m circumference collider (DIMUS) will allow for precision tests of QED and open the door for searches for new physics coupled to the muon. Fermilab's FAST/NML is perfectly suited for DIMUS as there are existing SRF accelerators and infrastructure, capable of producing high energy, high current electron and positron beams, sufficient for O(10 32 )cm 2 s −1 luminosity and ∼0.5 million dimuons per year. The expansion will require installation of a second SRF cryomodule, positron production and accumulation system, fast injection/extraction kickers and two small circumference intersecting rings. An approximately meter-sized detector with several layers of modern pixelated silicon detector and crystal-based electromagnetic calorimeters will ensure observation of the decays of dimuonium to electron-positron pairs in presence of the Bhabba scattering background. An expansion of the system to include solenoidal magnet outside of the calorimeter system, a layer of steel shielding behind the magnet, and a set of dedicated muon detectors would extend the physics program of DIMUS to include precision studies of rare processes with muons, pions, and η mesons produced in e + e − collisions.

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“…Especially for the bunch-by-bunch extraction scheme of ILC, the kicker rise time of a few ns, is extremely challenging. An ILC extraction experiment using a prototype strip-line kicker was carried out at KEK-ATF [108]. It achieved multi-bunch beam extraction with 5.6 ns bunch spacing.…”

Section: Low Emittance Generationmentioning

confidence: 99%