Physical Review Special Topics-accelerators and Beams最新文献_第4页

Alternating-gradient canted cosine theta superconducting magnets for future compact proton gantries 交替梯度倾斜余弦θ超导磁体的未来紧凑型质子门

Physical Review Special Topics-accelerators and Beams Pub Date : 2015-10-23 DOI: 10.1103/PHYSREVSTAB.18.103501

W. Wan, L. Brouwer, S. Caspi, S. Prestemon, A. Gerbershagen, J. Schippers, D. Robin

{"title":"Alternating-gradient canted cosine theta superconducting magnets for future compact proton gantries","authors":"W. Wan, L. Brouwer, S. Caspi, S. Prestemon, A. Gerbershagen, J. Schippers, D. Robin","doi":"10.1103/PHYSREVSTAB.18.103501","DOIUrl":"https://doi.org/10.1103/PHYSREVSTAB.18.103501","url":null,"abstract":"Author(s): Wan, W; Brouwer, L; Caspi, S; Prestemon, S; Gerbershagen, A; Schippers, JM; Robin, D | Abstract: © 2015 authors. Published by the American Physical Society. We present a design of superconducting magnets, optimized for application in a gantry for proton therapy. We have introduced a new magnet design concept, called an alternating-gradient canted cosine theta (AG-CCT) concept, which is compatible with an achromatic layout. This layout allows a large momentum acceptance. The 15 cm radius of the bore aperture enables the application of pencil beam scanning in front of the SC-magnet. The optical and dynamic performance of a gantry based on these magnets has been analyzed using the fields derived (via Biot-Savart law) from the actual windings of the AG-CCT combined with the full equations of motion. The results show that with appropriate higher order correction, a large 3D volume can be rapidly scanned with little beam shape distortion. A very big advantage is that all this can be done while keeping the AG-CCT fields fixed. This reduces the need for fast field ramping of the superconducting magnets between the successive beam energies used for the scanning in depth and it is important for medical application since this reduces the technical risk (e.g., a quench) associated with fast field changes in superconducting magnets. For proton gantries the corresponding superconducting magnet system holds promise of dramatic reduction in weight. For heavier ion gantries there may furthermore be a significant reduction in size.","PeriodicalId":20072,"journal":{"name":"Physical Review Special Topics-accelerators and Beams","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76179276","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: 46

Wakefield potentials of corrugated structures 波纹结构的尾波场电位

Physical Review Special Topics-accelerators and Beams Pub Date : 2015-10-22 DOI: 10.1103/PHYSREVSTAB.18.104402

A. Novokhatski

引用次数: 23

Analytical bunch compression studies for a linac-based electron accelerator 基于直线加速器的束压缩分析研究

Physical Review Special Topics-accelerators and Beams Pub Date : 2015-10-19 DOI: 10.1103/PHYSREVSTAB.18.100101

M. Schreck, P. Wesolowski

引用次数: 3

Adaptive method for electron bunch profile prediction 电子束分布预测的自适应方法

Physical Review Special Topics-accelerators and Beams Pub Date : 2015-10-15 DOI: 10.1103/PHYSREVSTAB.18.102801

A. Scheinker, S. Gessner

引用次数: 36

Advanced simulations of optical transition and diffraction radiation 光学跃迁和衍射辐射的高级模拟

Physical Review Special Topics-accelerators and Beams Pub Date : 2015-10-14 DOI: 10.1103/PHYSREVSTAB.18.042801

T. Aumeyr, E. Bravin, K. Kruchinin, B. Bolzon, L. Bobb, M. Billing, P. Karataev, T. Lefevre, S. Mazzoni

引用次数: 7

Very high resolution optical transition radiation imaging system: Comparison between simulation and experiment 超高分辨率光学跃迁辐射成像系统:仿真与实验比较

Physical Review Special Topics-accelerators and Beams Pub Date : 2015-10-14 DOI: 10.1103/PHYSREVSTAB.18.082803

B. Bolzon, B. Bolzon, B. Bolzon, A. Aryshev, T. Aumeyr, S. Boogert, P. Karataev, K. Kruchinin, T. Lefevre, S. Mazzoni, L. Nevay, M. Shevelev, N. Terunuma, J. Urakawa, C. Welsch, C. Welsch

引用次数: 17

Optimizing integrated luminosity of future hadron colliders 优化未来强子对撞机的综合亮度

Physical Review Special Topics-accelerators and Beams Pub Date : 2015-10-13 DOI: 10.1103/PHYSREVSTAB.18.101002

M. Benedikt, D. Schulte, F. Zimmermann

{"title":"Optimizing integrated luminosity of future hadron colliders","authors":"M. Benedikt, D. Schulte, F. Zimmermann","doi":"10.1103/PHYSREVSTAB.18.101002","DOIUrl":"https://doi.org/10.1103/PHYSREVSTAB.18.101002","url":null,"abstract":"The integrated luminosity, a key figure of merit for any particle-physics collider, is closely linked to the peak luminosity and to the beam lifetime. The instantaneous peak luminosity of a collider is constrained by a number of boundary conditions, such as the available beam current, the maximum beam-beam tune shift with acceptable beam stability and reasonable luminosity lifetime (i.e., the empirical “beam-beam limit”), or the event pileup in the physics detectors. The beam lifetime at high-luminosity hadron colliders is largely determined by particle burn off in the collisions. In future highest-energy circular colliders synchrotron radiation provides a natural damping mechanism, which can be exploited for maximizing the integrated luminosity. In this article, we derive analytical expressions describing the optimized integrated luminosity, the corresponding optimum store length, and the time evolution of relevant beam parameters, without or with radiation damping, while respecting a fixed maximum value for the total beam-beam tune shift or for the event pileup in the detector. Our results are illustrated by examples for the proton-proton luminosity of the existing Large Hadron Collider (LHC) at its design parameters, of the High-Luminosity Large Hadron Collider (HL-LHC), and of the Future Circular Collider (FCC-hh).","PeriodicalId":20072,"journal":{"name":"Physical Review Special Topics-accelerators and Beams","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78025799","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: 50

Efficient generation of short and high-power x-ray free-electron-laser pulses based on superradiance with a transversely tilted beam 基于横向倾斜光束超辐射的短功率x射线自由电子激光脉冲的高效产生

Physical Review Special Topics-accelerators and Beams Pub Date : 2015-10-12 DOI: 10.1103/PHYSREVSTAB.18.100701

E. Prat, F. Löhl, S. Reiche

引用次数: 47

Generation of high-energy electron-positron beams in the collision of a laser-accelerated electron beam and a multi-petawatt laser 激光加速电子束与多拍瓦激光碰撞产生高能电子-正电子束

Physical Review Special Topics-accelerators and Beams Pub Date : 2015-10-08 DOI: 10.1103/PhysRevSTAB.20.043401

M. Lobet, X. Davoine, E. D'humieres, L. Gremillet

引用次数: 1

Transverse emittance growth due to rf noise in the high-luminosity LHC crab cavities 高亮度LHC蟹状腔中射频噪声导致的横向发射度增长

Physical Review Special Topics-accelerators and Beams Pub Date : 2015-10-05 DOI: 10.1103/PHYSREVSTAB.18.101001

P. Baudrenghien, T. Mastoridis

{"title":"Transverse emittance growth due to rf noise in the high-luminosity LHC crab cavities","authors":"P. Baudrenghien, T. Mastoridis","doi":"10.1103/PHYSREVSTAB.18.101001","DOIUrl":"https://doi.org/10.1103/PHYSREVSTAB.18.101001","url":null,"abstract":"The high-luminosity LHC (HiLumi LHC) upgrade with planned operation from 2025 onward has a goal of achieving a tenfold increase in the number of recorded collisions thanks to a doubling of the intensity per bunch (2.2e11 protons) and a reduction of β to 15 cm. Such an increase would significantly expedite new discoveries and exploration. To avoid detrimental effects from long-range beam-beam interactions, the half crossing angle must be increased to 295 microrad. Without bunch crabbing, this large crossing angle and small transverse beam size would result in a luminosity reduction factor of 0.3 (Piwinski angle). Therefore, crab cavities are an important component of the LHC upgrade, and will contribute strongly to achieving an increase in the number of recorded collisions. The proposed crab cavities are electromagnetic devices with a resonance in the radio frequency (rf) region of the spectrum (400.789 MHz). They cause a kick perpendicular to the direction of motion (transverse kick) to restore an effective head-on collision between the particle beams, thereby restoring the geometric factor to 0.8 [K. Oide and K. Yokoya, Phys. Rev. A 40, 315 (1989).]. Noise injected through the rf/low level rf (llrf) system could cause significant transverse emittance growth and limit luminosity lifetime. In this work, a theoretical relationship between the phase and amplitude rf noise spectrum and the transverse emittance growth rate is derived, for a hadron machine assuming zero synchrotron radiation damping and broadband rf noise, excluding infinitely narrow spectral lines. This derivation is for a single beam. Both amplitude and phase noise are investigated. The potential improvement in the presence of the transverse damper is also investigated.","PeriodicalId":20072,"journal":{"name":"Physical Review Special Topics-accelerators and Beams","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80282176","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: 20