Physical Review Special Topics-accelerators and Beams最新文献_第5页

Conceptual design of heavy ion beam compression using a wedge 使用楔形压缩重离子束的概念设计

Physical Review Special Topics-accelerators and Beams Pub Date : 2015-10-05 DOI: 10.1103/PHYSREVSTAB.18.101301

Jonathan C. Wong, B. Logan, Simon S. Yu

引用次数: 0

Cherenkov-transition radiation in a waveguide partly filled with a resonance dispersion medium 部分填充共振色散介质的波导中的切伦科夫跃迁辐射

Physical Review Special Topics-accelerators and Beams Pub Date : 2015-09-30 DOI: 10.1103/PHYSREVSTAB.18.091302

T. Alekhina, A. Tyukhtin, A. A. Grigoreva

引用次数: 7

Measurements and simulations of seeded electron microbunches with collective effects 具有集体效应的种子电子微束的测量和模拟

Physical Review Special Topics-accelerators and Beams Pub Date : 2015-09-30 DOI: 10.1103/PHYSREVSTAB.18.090704

K. Hacker, Shaukat Khan, R.Molo

引用次数: 6

Observation of a variable sub-THz radiation driven by a low energy electron beam from a thermionic rf electron gun 由热离子射频电子枪低能电子束驱动的可变亚太赫兹辐射的观察

Physical Review Special Topics-accelerators and Beams Pub Date : 2015-09-29 DOI: 10.1103/PHYSREVSTAB.18.090703

A. Smirnov, R. Agustsson, W. Berg, S. Boucher, J. Dooling, T. Campese, Y. Chen, L. Erwin, B. Jacobson, J. Hartzell, R. Lindberg, A. Murokh, F.H.O'Shea, E. Spranza, S. Pasky, M. Ruelas, N. Sereno, Y. Sun, A. Zholents

引用次数: 20

Normal-conducting scaling fixed field alternating gradient accelerator for proton therapy 质子治疗用常导定标固定场交变梯度加速器

Physical Review Special Topics-accelerators and Beams Pub Date : 2015-09-29 DOI: 10.1103/PHYSREVSTAB.18.094701

J. Garland, R. Appleby, H. Owen, S. Tygier

{"title":"Normal-conducting scaling fixed field alternating gradient accelerator for proton therapy","authors":"J. Garland, R. Appleby, H. Owen, S. Tygier","doi":"10.1103/PHYSREVSTAB.18.094701","DOIUrl":"https://doi.org/10.1103/PHYSREVSTAB.18.094701","url":null,"abstract":"In this paper we present a new lattice design for a 30–350 MeV scaling fixed-field alternating gradient accelerator for proton therapy and tomography—NORMA (NOrmal-conducting Racetrack Medical Accelerator). The energy range allows the realization of proton computed tomography and utilizes normal conducting magnets in both a conventional circular ring option and a novel racetrack configuration, both designed using advanced optimization algorithms we have developed in PyZgoubi. Both configurations consist of ten focusing-defocusing-focusing triplet cells and operate in the second stability region of Hills equation. The ring configuration has a circumference of 60 m, a peak magnetic field seen by the beam of <1.6 T, a maximum horizontal orbit excursion of 44 cm and a dynamic aperture of 68 mm mrad— determined using a novel dynamic aperture (DA) calculation technique. The racetrack alternative is realized by adding magnet-free drift space in between cells at two opposing points in the ring, to facilitate injection and extraction. Our racetrack design has a total magnet-free straight lengths of 4.9 m, a circumference of 71 m, a peak magnetic field seen by the beam of <1.74 T, a maximum horizontal orbit excursion of 50 cm and a DA of 58 mm mrad. A transverse magnet misalignment model is also presented for the ring and racetrack configurations where the DA remains above 40 mm mrad for randomly misaligned error distributions with a standard deviation up to 100 μm.","PeriodicalId":20072,"journal":{"name":"Physical Review Special Topics-accelerators and Beams","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83802733","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Compact representations of partially coherent undulator radiation suitable for wave propagation 适合于波传播的部分相干波动辐射的紧凑表示

Physical Review Special Topics-accelerators and Beams Pub Date : 2015-09-28 DOI: 10.1103/PHYSREVSTAB.18.090702

R. Lindberg, Kwang-je Kim

引用次数: 18

Application of disturbance observer-based control in low-level radio-frequency system in a compact energy recovery linac at KEK 扰动观测器控制在低电平射频系统中的应用

Physical Review Special Topics-accelerators and Beams Pub Date : 2015-09-28 DOI: 10.1103/PHYSREVSTAB.18.092801

F. Qiu, S. Michizono, T. Miura, Toshihiro Matsumoto, M. Omet, Basuki Wibowo Sigit

引用次数: 26

New technology based on clamping for high gradient radio frequency photogun 基于夹持的高梯度射频照相枪新技术

Physical Review Special Topics-accelerators and Beams Pub Date : 2015-09-15 DOI: 10.1103/PHYSREVSTAB.18.092001

D. Alesini, A. Battisti, M. Ferrario, L. Foggetta, V. Lollo, L. Ficcadenti, V. Pettinacci, S. Custodio, E. Pirez, P. Musumeci, L. Palumbo

{"title":"New technology based on clamping for high gradient radio frequency photogun","authors":"D. Alesini, A. Battisti, M. Ferrario, L. Foggetta, V. Lollo, L. Ficcadenti, V. Pettinacci, S. Custodio, E. Pirez, P. Musumeci, L. Palumbo","doi":"10.1103/PHYSREVSTAB.18.092001","DOIUrl":"https://doi.org/10.1103/PHYSREVSTAB.18.092001","url":null,"abstract":"High gradient rf photoguns have been a key development to enable several applications of high quality electron beams. They allow the generation of beams with very high peak current and low transverse emittance, satisfying the tight demands for free-electron lasers, energy recovery linacs, Compton/Thomson sources and high-energy linear colliders. In the present paper we present the design of a new rf photogun recently developed in the framework of the SPARC_LAB photoinjector activities at the laboratories of the National Institute of Nuclear Physics in Frascati (LNF-INFN, Italy). This design implements several new features from the electromagnetic point of view and, more important, a novel technology for its realization that does not involve any brazing process. From the electromagnetic point of view the gun presents high mode separation, low peak surface electric field at the iris and minimized pulsed heating on the coupler. For the realization, we have implemented a novel fabrication design that, avoiding brazing, strongly reduces the cost, the realization time and the risk of failure. Details on the electromagnetic design, low power rf measurements and high power radiofrequency and beam tests performed at the University of California in Los Angeles (UCLA) are discussed in the paper.","PeriodicalId":20072,"journal":{"name":"Physical Review Special Topics-accelerators and Beams","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84211410","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 44

Segmented beryllium target for a 2 MW super beam facility 2mw超束流装置的分段铍靶

Physical Review Special Topics-accelerators and Beams Pub Date : 2015-09-14 DOI: 10.1103/PHYSREVSTAB.18.091003

T. Davenne, O. Caretta, C. Densham, M. Fitton, P. Loveridge, P. Hurh, R. Zwaska, J. Hylen, V. Papadimitriou

引用次数: 6

Scattering effects in passive foil focusing of ion beams 离子束被动箔聚焦中的散射效应

Physical Review Special Topics-accelerators and Beams Pub Date : 2015-09-11 DOI: 10.1103/PHYSREVSTAB.18.091301

A. Yuen, S. Lund, J. Barnard, R. Cohen, J. Wurtele

{"title":"Scattering effects in passive foil focusing of ion beams","authors":"A. Yuen, S. Lund, J. Barnard, R. Cohen, J. Wurtele","doi":"10.1103/PHYSREVSTAB.18.091301","DOIUrl":"https://doi.org/10.1103/PHYSREVSTAB.18.091301","url":null,"abstract":"A stack of thin, closely spaced conducting foils has been investigated by Lund et al. [Phys. Rev. ST Accel. Beams 16, 044202 (2013)] as a passive focusing lens for intense ion beams. The foils mitigate space-charge defocusing forces to enable the beam self-magnetic field to focus. In this study, we analyze possible degradation of focusing due to scattering of beam ions resulting from finite foil thickness using an envelope model and numerical simulations with the particle-in-cell code WARP. Ranges of kinetic energy where scattering effects are sufficient to destroy passive focusing are quantified. The scheme may be utilized to focus protons produced in intense laser-solid accelerator schemes. As an example, the spot size of an initially collimated 30 MeV proton beam with initial rms radius $200text{ }text{ }ensuremath{mu}mathrm{m}$, perveance $Q=1.8ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}2}$, and initial transverse emittance ${ϵ}_{x,mathrm{rms}}=0.87text{ }text{ }mathrm{mm}text{ }mathrm{mrad}$ propagating through a stack of $6.4text{ }text{ }ensuremath{mu}mathrm{m}$ thick foils, spaced $100text{ }text{ }ensuremath{mu}mathrm{m}$ apart, gives a $127.5text{ }text{ }ensuremath{mu}mathrm{m}$ spot with scattering and a $81.0text{ }text{ }ensuremath{mu}mathrm{m}$ spot without scattering, illustrating the importance of including scattering effects.","PeriodicalId":20072,"journal":{"name":"Physical Review Special Topics-accelerators and Beams","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78324308","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2