First operation of a superconducting rf-particle separator

Citron, A.; Dammertz, G.; Grundner, M.; Husson, L.; Lehm, R.; Lengeler, H.; Plane, D. E.; Winkler, Gunter

doi:10.1016/0029-554x(78)90190-8

Cited by 20 publications

(4 citation statements)

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“…The deflecting systems provide a kick to the center of mass of particle bunches, whereas crabbing systems kick the head and tail of the bunch in opposite directions, with a net-zero kick to its center of mass. Radio-frequency deflection systems are used both as beam choppers [1][2][3] and beam separators [4][5][6][7][8]. Some examples of applications employing crabbing systems are ultrashort beam pulse generators [9][10][11], in measuring longitudinal and transverse phase space and bunch length [12][13][14]; they also are invaluable for ultrashort femtosecond diagnostics [15][16][17][18] and "crab crossing" for head-on collision in particle colliders [19].…”

Section: Introductionmentioning

confidence: 99%

Design, prototyping, and testing of a compact superconducting double quarter wave crab cavity

Xiao

Alberty

Belomestnykh

et al. 2015

Phys. Rev. ST Accel. Beams

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We proposed a novel design for a compact superconducting crab cavity with a double quarter wave (DQWCC) shape. After fabrication and surface treatments, this niobium proof-of-principle cavity was tested cryogenically in a vertical cryostat. The cavity is extremely compact yet has a low frequency of 400 MHz, an essential property for service in the Large Hadron Collider luminosity upgrade. The cavity's electromagnetic properties are well suited for this demanding task. The demonstrated deflecting voltage of 4.6 MV is well above the required 3.34 MV for a crab cavity in the future High Luminosity LHC. In this paper, we present the design, prototyping, and results from testing the DQWCC.

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Section: Introductionmentioning

confidence: 99%

Design, prototyping, and testing of a compact superconducting double quarter wave crab cavity

Xiao

Alberty

Belomestnykh

et al. 2015

Phys. Rev. ST Accel. Beams

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“…A better knowledge of the kaon spectrum will also help to improve the analyses that search for CP violation in multi-body hadronic decays of D and B mesons, where kaon resonances appear in the subsystems of various final states. Using RF-separation techniques [335][336][337], the kaon fraction of the high-intensity hadron beam in the SPS M2 beam line could be dramatically enhanced so that data samples of much higher precision than any previous experiment could be obtained. For example, for the K − π − π + final state, data samples of the order of 10 7 events could be collected.…”

Section: Discussionmentioning

confidence: 99%

Light-Meson Spectroscopy with COMPASS

Ketzer,

Grube,

Ryabchikov

2019

Preprint

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Despite decades of research, we still lack a detailed quantitative understanding of the way quantum chromodynamics (QCD) generates the spectrum of hadrons. Precise experimental studies of the hadron excitation spectrum and the dynamics of hadrons help to improve models and to test effective theories and lattice QCD simulations. In addition, QCD seems to allow hadrons beyond the three-quark and quark-antiquark configurations of the constituent-quark model. These so-called exotic hadrons contain additional constituent (anti)quarks or excited gluonic fields that contribute to the quantum numbers of the hadron. Hadron spectroscopy is currently one of the most active fields of research in hadron physics. The COMPASS experiment at the CERN SPS is studying the excitation spectrum of light mesons, which are composed of up, down, and strange quarks. The excited mesons are produced via the strong interaction, i.e. by Pomeron exchange, by scattering a 190 GeV/c pion beam off proton or nuclear targets. On heavy nuclear targets, in addition the electromagnetic interaction contributes in the form of quasi-real photon exchange at very low four-momentum transfer squared. COMPASS has performed the most comprehensive analyses to date of isovector resonances decaying into ηπ, η π, or π − π − π + final states. In this review, we give a general and pedagogical introduction into scattering theory and the employed partial-wave analysis techniques. We also describe novel methods developed for the high-precision COMPASS data. The COMPASS results are summarized and compared to previous measurements. In addition, we discuss possible signals for exotic mesons and conclude that COMPASS data provide solid evidence for the existence of the manifestly exotic π 1 (1600), which has quantum numbers forbidden for a quark-model state, and of the a 1 (1420), which does not fit into the quark-model spectrum. By isolating the contributions from quasi-real photon exchange, COMPASS has measured the radiative widths of the a 2 (1320) and, for the first time, that of the π 2 (1670) and has tested predictions of chiral perturbation theory for the process π − + γ → π − π − π + .

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“…Conceptually, deflecting and crabbing structures are identical; the former operate in the mode where the center of the bunch experiences a finite (often maximum) integrated Lorentz transverse force while the latter operate in the mode where the center of the bunch experiences a zero integrated Lorentz force but the front and tail of the bunch are deflected in opposite directions. The majority of deflecting/crabbing structures are single-cell or multicell superconducting cavities operating in the TM 110 mode [1][2][3][4], although some are room temperature structures operating in a =4 mode [5] or are of H type [6]. Deflecting cavities have been used to deliver a particle beam, often simultaneously, to a number of experimental stations [7], while crabbing rf structures have been of interest for the increase of luminosity in colliders-both circular and linear [8,9]-and, more recently, for the generation of subpicosecond x-ray pulses [10,11].…”

Section: Introductionmentioning

confidence: 99%

New compact TEM-type deflecting and crabbing rf structure

Delayen

Wang

2009

Phys. Rev. ST Accel. Beams

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A new type of rf structure for the deflection and crabbing of particle beams is presented. The structure is comprised of a number of parallel TEM resonant lines operating in opposing phase from each other. One of its advantages is its compactness compared to conventional crabbing cavities operating in the TM 110 mode, thus allowing low frequency designs. This geometry would also be effective for the deflection of beams propagating at velocities substantially less than that of light.

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First operation of a superconducting rf-particle separator

Cited by 20 publications

References 1 publication

Design, prototyping, and testing of a compact superconducting double quarter wave crab cavity

Design, prototyping, and testing of a compact superconducting double quarter wave crab cavity

Light-Meson Spectroscopy with COMPASS

New compact TEM-type deflecting and crabbing rf structure

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