Development of a beta 0.12, 88MHz, quarter-wave resonator and its cryomodule for the SPIRAL2 project

Olry, G.; Biarrotte, Jean‐Luc; Blivet, S.; Bousson, S.; Commeaux, C.; Joly, C.; Junquera, T.; Lesrel, J.; Roy, Emmanuel; Saugnac, H.; Szott, P.

doi:10.1016/j.physc.2006.03.030

Cited by 11 publications

(10 citation statements)

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“…both beam tubes fixed) and a 3-mm uniform thickness for all cavity walls. This result fits well the measurements, as for the other calculations he performed for the beta 0.15 spoke cavity (next §) and the beta 0.12 Quarter-Wave Resonator [3].…”

Section: Lorentz Force Detuningsupporting

confidence: 89%

Development of spoke cavities for the EURISOL and EUROTRANS projects

Olry

Biarrotte

Blivet

et al. 2006

Physica C: Superconductivity

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IPN Orsay is strongly involved within the EURISOL and EUROTRANS projects, especially collaborating to the overall design of their linac architecture. Since a few years, main part of the R&D work is dedicated to the development of superconducting spoke cavities and their associated components (RF coupler, tuning system horizontal cryomodule, etc.). Following the very promising results obtained with our first single-spoke prototype (2-gap, 352 MHz, beta 0.35), a new prototype has been designed and fabricated (2-gap, 352 MHz, beta 0.15) in order to be integrated in a future linac. The mechanical and RF tests, done on this prototype, are presented. Then, an overview of the latest beam dynamics calculations performed to design a linac using spoke cavities will be described

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Section: Lorentz Force Detuningsupporting

confidence: 89%

Development of spoke cavities for the EURISOL and EUROTRANS projects

Olry

Biarrotte

Blivet

et al. 2006

Physica C: Superconductivity

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“…Tuning of single mode QWRs is typically done by mechanically deforming a thin plate mounted at the capacitive end disk of the cavity, adjusting the distance between the bottom plate and the electrode of the inner conductor [13]. Other approaches to tune the QWR include deforming the walls of the cavity and introducing movable plungers in the magnetic field area [14]. For a multifrequency structure, the tuning is more challenging since each mode cannot be tuned independently from the others.…”

Section: B Taper Slope and Tuner Designmentioning

confidence: 99%

“…Here Z 0 is the characteristic impedance of the transmission line in Eq. (14) and is determined by the ratio between inner and outer conductor. C 0 is the capacitor of the end gap, and l is the total length of the cavity.…”

Section: B Taper Slope and Tuner Designmentioning

confidence: 99%

Multiple harmonic frequencies resonant cavity design and half-scale prototype measurements for a fast kicker

Huang

Wang

Rimmer

et al. 2016

Phys. Rev. Accel. Beams

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Quarter wavelength resonator (QWR) based deflecting cavities with the capability of supporting multiple odd-harmonic modes have been developed for an ultrafast periodic kicker system in the proposed Jefferson Lab Electron Ion Collider (JLEIC, formerly MEIC). Previous work on the kicking pulse synthesis and the transverse beam dynamics tracking simulations show that a flat-top kicking pulse can be generated with minimal emittance growth during injection and circulation of the cooling electron bunches. This flattop kicking pulse can be obtained when a DC component and 10 harmonic modes with appropriate amplitude and phase are combined together. To support 10 such harmonic modes, four QWR cavities are used with 5, 3, 1, and 1 modes, respectively. In the multiple-mode cavities, several slightly tapered segments of the inner conductor are introduced to tune the higher order deflecting modes to be harmonic, and stub tuners are used to fine tune each frequency to compensate for potential errors. In this paper, we summarize the electromagnetic design of the five-mode cavity, including the geometry optimization to get high transverse shunt impedance, the frequency tuning and sensitivity analysis, and the single loop coupler design for coupling to all of the harmonic modes. In particular we report on the design and fabrication of a half-scale copper prototype of this proof-of-principle five-odd-mode cavity, as well as the rf bench measurements. Finally, we demonstrate mode superposition in this cavity experimentally, which illustrates the kicking pulse generation concept.

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“…If the beam axis is in the z-direction, and bunches will be kicked in the x-direction, According to the discussions in chapter 2 and Equ. (2.43), the multipole components in the cavity can be calculated by two methods [70] ,…”

Section: Multipole Field Analysismentioning

confidence: 99%

Investigation of an Ultrafast Harmonic Resonant RF Kicker

Huang

2016

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An Energy Recovery Linac (ERL) based multi-turn electron Circulator Cooler Ring (CCR) is envisaged in the proposed Jefferson Lab Electron Ion Collider (JLEIC) to cool the ion bunches with high energy (55 MeV), high current (1.5 A), high repetition frequency (476.3 MHz), high quality magnetized electron bunches. A critical component in this scheme is a pair of ultrafast kickers for the exchange of electron bunches between the ERL and the CCR. The ultrafast kicker should operate with the rise and fall time in less than 2.1 ns, at the repetition rate of ~10s MHz, and should be able to run continuously during the whole period of cooling. These -and-fall time being combined together, are well beyond the state-of-art of traditional pulsed power supplies and magnet kickers.To solve this technical challenge, an alternative method is to generate this high repetition rate, fast rise-and-fall time short pulse continuous waveform by summing several finite number of (co)sine waves at harmonic frequencies of the kicking repetition frequency, and these harmonic modes can be generated by the Quarter Wave Resonater (QWR) based multifrequency cavities. Assuming the recirculator factor is 10, 10 harmonic modes (from 47.63 MHz to 476.3 MHz) with proper amplitudes and phases, plus a DC offset are combined together, a continuous short pulse waveform ABSTRACT II with the rise-and-fall time in less than 2.1 ns, repetition rate of 47.63 MHz waveform can be generated. With the compact and matured technology of QWR cavities, the total cost of both hardware development and operation can be reduced to a modest level.Focuse on the technical scheme, three main topics will be discussed in this thesis: the synthetization of the kicking pulse, the design and optimization of the deflecting QWR multi-integer harmonic frequency resonator and the fabrication and bench measurements of a half scale copper prototype.In the kicking pulse synthetization part, we begin with the Fourier Series expansion of an ideal square pulse, and get a Flat-Top waveform which will give a uniform kick over the bunch length of the kicked electron bunches, thus the transverse emittance of these kicked electron bunches can be maintained. By using two identical kickers with the betatron phase advance of 180 degree or its odd multiples, the residual kick voltage wave slopes at the unkicked bunch position will be totally cancelled out. Flat-Top waveform combined with two kicker scheme, the transverse emittance of the cooling electron bunches will be conserved during the whole injection, recirculation, and ejection processes.In the cavity design part, firstly, the cavity geometry is optimized to get high transverse shunt impedance thus less than 100 W of RF losses on the cavity wall can be achieved for all these 10 harmonic modes. To support all these 10 harmonic modes, group of four QWRs are adopted with the mode distribution of 5:3:1:1. In the multi-frequency cavities such as the five-mode-cavity and the three-mode-cavity, tunings are required to achieve the design frequencies...

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Development of a beta 0.12, 88MHz, quarter-wave resonator and its cryomodule for the SPIRAL2 project

Cited by 11 publications

References 0 publications

Development of spoke cavities for the EURISOL and EUROTRANS projects

Development of spoke cavities for the EURISOL and EUROTRANS projects

Multiple harmonic frequencies resonant cavity design and half-scale prototype measurements for a fast kicker

Investigation of an Ultrafast Harmonic Resonant RF Kicker

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