Higher-order-mode (HOM) power in elliptical superconducting cavities for intense pulsed proton accelerators

Kim, Sang-ho; Doléans, M.; Jeon, D.; Sundelin, R.

doi:10.1016/s0168-9002(02)01286-x

Cited by 16 publications

(7 citation statements)

References 3 publications

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“…With the reconstructed single-bunch wake potential for the "worst case scenario", we then used the "shift and stack" method to get the multi-bunch multi-train wake potential, with 30 continuous bunches at the 704 MHz repetition frequency forming bunch trains at the 9 MHz repetition rate with ~40% duty factor. The results are consistent with the method proposed by Kim et al [13] since both methods are based on the delta function structure.…”

Section: Hom Considerationsupporting

confidence: 90%

Design and test of 704 MHz and 2.1 GHz normal conducting cavities for low energy RHIC electron cooler

Xiao

Belomestnykh

Brennan

et al. 2019

Phys. Rev. Accel. Beams

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The Low Energy RHIC electron Cooler (LEReC) is currently under commissioning at BNL to improve RHIC luminosity for heavy ion beam energies below 10 GeV/nucleon. The linac of LEReC consists of a DC photoemission gun, one 704 MHz superconducting radio frequency (SRF) booster cavity, and three normal conducting cavities. It is designed to deliver a 1.6 MeV to 2.6 MeV electron beam, with peak-to-peak momentum spread dp/p of less than 7⋅10 -4 . Two of the three normal conducting cavities will be used in LEReC for energy spread correction. A single-cell 704 MHz cavity for energy de-chirping and a three-cell 2.1 GHz third harmonic cavity for RF curvature correction. In this paper, we present the designs and RF test results of these two cavities.DOI:

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Section: Hom Considerationsupporting

confidence: 90%

Design and test of 704 MHz and 2.1 GHz normal conducting cavities for low energy RHIC electron cooler

Xiao

Belomestnykh

Brennan

et al. 2019

Phys. Rev. Accel. Beams

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“…With the single bunch wake potential reconstructed from the Eigenmode simulation results using the method in [12] for point charge, we then use the "shift and stack" method introduced above to get the multibunch multi-train wake potential, with 30 continuous bunches with 704 MHz frequency in a 9 MHz train with ~40% duty factor. The results are consistent with the method proposed by Kim [13] since both methods are based on delta function structure. For the 704 MHz booster cavity, the multi-bunch multi-train saturates at 4.92 kV voltage fluctuation.…”

Section: Energy Spread With Hom Dampersupporting

confidence: 89%

Higher order mode damper for low energy RHIC electron cooler superconducting radio frequency booster cavity

Xiao

Fedotov

Hahn

et al. 2019

Phys. Rev. Accel. Beams

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To improve RHIC luminosity for heavy ion beam energies below 10 GeV/nucleon, the Low Energy RHIC electron Cooler (LEReC) is currently under commissioning at BNL. The Linac of LEReC is designed to deliver a 1.6 MeV to 2.6 MeV electron beam, with rms dp/p less than 5e-4. A 704 MHz superconducting radio frequency (SRF) booster cavity in this Linac provides up to 2.2 MeV accelerating voltage. With such a low energy and very demanding energy spread requirement, control of Higher Order Modes (HOMs) in the cavities becomes critical and needs to be carefully evaluated to ensure minimum impact on the beam. In this paper, we report the multiphysics design of the HOM damper for this cavity to meet the energy spread requirement, as well as experimental results of the cavity with and without the HOM damper.DOI:

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“…In this section a brief summary is given of the basics of higher order mode excitation and beam interaction based on [8,[16][17][18]. For simplification, a complex notation for the voltage is used.…”

Section: Beam Physicsmentioning

confidence: 99%

Influence of higher order modes on the beam stability in the high power superconducting proton linac

Schuh

Gerigk

Tückmantel

et al. 2011

Phys. Rev. ST Accel. Beams

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Higher order modes (HOMs) can severely limit the operation of superconducting cavities in a linear accelerator with high beam current, high duty factor, and complex pulse structure. The full HOM spectrum has to be analyzed in order to identify potentially dangerous modes already during the design phase and to define their damping requirements. For this purpose a dedicated beam simulation code simulation of higher order mode dynamics (SMD) focused on beam-HOM interaction was developed, taking into account important effects like the HOM frequency spread, beam input jitter, different chopping patterns, as well as klystron and alignment errors. Here, SMD is used to investigate the influence of HOMs in detail in the superconducting proton linac at CERN and their potential to drive beam instabilities in the longitudinal and transverse plane.

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Higher-order-mode (HOM) power in elliptical superconducting cavities for intense pulsed proton accelerators

Cited by 16 publications

References 3 publications

Design and test of 704 MHz and 2.1 GHz normal conducting cavities for low energy RHIC electron cooler

Design and test of 704 MHz and 2.1 GHz normal conducting cavities for low energy RHIC electron cooler

Higher order mode damper for low energy RHIC electron cooler superconducting radio frequency booster cavity

Influence of higher order modes on the beam stability in the high power superconducting proton linac

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