Preview: Recent Articles in Phys. Rev. ST Accel. Beams
Recent Articles in Phys. Rev. ST Accel. BeamsRecent articles in Physical Review Special Topics - Accelerators and BeamsPublished: 2012-02-09T16:06:13-05:00
Stretched wire measurement of multipole accelerator magnets 2012-02-08T10:00:00-05:00 Author(s): G. Le Bec, J. Chavanne, and Ch. PenelTheoretical aspects of stretched wire field integral measurements are investigated. A least square approach is used for the processing of the measured signal; it can be applied to any wire trajectory and it allows numerical correction of the wire position errors. Moreover, the signal from some multi... (image) [Phys. Rev. ST Accel. Beams 15, 022401] Published Wed Feb 08, 2012
Pulse-mode measurement of electron beam halo using diamond-based detector 2012-02-06T10:00:00-05:00 Author(s): Hideki Aoyagi, Yoshihiro Asano, Toshiro Itoga, Nobuteru Nariyama, Teruhiko Bizen, Takashi Tanaka, and Hideo KitamuraUsing a diamond-based detector, the electron beam halo in a high-energy accelerator can be measured with a lower detection limit than that using other instruments, such as a core monitor, a dose meter, or an optical fiber. We have successfully measured an electron beam halo using diamond-based detec... (image) [Phys. Rev. ST Accel. Beams 15, 022801] Published Mon Feb 06, 2012
Reversible electron beam heating for suppression of microbunching instabilities at free-electron lasers 2012-02-06T10:00:00-05:00 Author(s): Christopher Behrens, Zhirong Huang, and Dao XiangThe presence of microbunching instabilities due to the compression of high-brightness electron beams at existing and future x-ray free-electron lasers (FELs) results in restrictions on the attainable lasing performance and renders beam imaging with optical transition radiation impossible. The instab... (image) [Phys. Rev. ST Accel. Beams 15, 022802] Published Mon Feb 06, 2012
Shock-wave-based density down ramp for electron injection 2012-02-02T10:00:00-05:00 Author(s): Chunmei Wang, Ji Li, Jun Sun, and Xisheng LuoWe demonstrate a sharp density transition for electron injection in laser wakefield acceleration through numerical study. This density transition is generated by a detached shock wave induced by a cylinder inserted into a supersonic helium gas flow. In a Mach 1.5 flow, the scale length of the densit... (image) [Phys. Rev. ST Accel. Beams 15, 020401] Published Thu Feb 02, 2012
Simulation of enhanced characteristic x rays from a 40-MeV electron beam laser accelerated in plasma 2012-02-02T10:00:00-05:00 Author(s): L. Nikzad, R. Sadighi-Bonabi, Z. Riazi, M. Mohammadi, and F. HeydarianSimulation of x-ray generation from bombardment of various solid targets by quasimonoenergetic electrons is considered. The electron bunches are accelerated in a plasma produced by interaction of 500 mJ, 30 femtosecond laser pulses with a helium gas jet. These relativistic electrons propagate in the... (image) [Phys. Rev. ST Accel. Beams 15, 021301] Published Thu Feb 02, 2012
Characterization of transverse beam emittance of electrons from a laser-plasma wakefield accelerator in the bubble regime using betatron x-ray radiation 2012-02-02T10:00:00-05:00 Author(s): S. Kneip, C. McGuffey, J. L. Martins, M. S. Bloom, V. Chvykov, F. Dollar, R. Fonseca, S. Jolly, G. Kalintchenko, K. Krushelnick, A. Maksimchuk, S. P. D. Mangles, Z. Najmudin, C. A. J. Palmer, K. Ta Phuoc, W. Schumaker, L. O. Silva, J. Vieira, V. Yanovsky, and A. G. R. ThomasWe propose and use a technique to measure the transverse emittance of a laser-wakefield accelerated beam of relativistic electrons. The technique is based on the simultaneous measurements of the electron beam divergence given by v⊥/v∥, the measured spectrum γ, and the transverse electron bunch size ... (image) [Phys. Rev. ST Accel. Beams 15, 021302] Published Thu Feb 02, 2012
Proposed scaling law for intensity evolution in hadron storage rings based on dynamic aperture variation with time 2012-02-02T10:00:00-05:00 Author(s): M. GiovannozziA scaling law for the time dependence of the dynamic aperture, i.e., the region of phase space where stable motion occurs, has been proposed in previous papers [ M. Giovannozzi, W. Scandale and E. Todesco Part. Accel. 56 195 (1996); M. Giovannozzi, W. Scandale, and E. Todesco, in Proceedings of the... (image) [Phys. Rev. ST Accel. Beams 15, 024001] Published Thu Feb 02, 2012
Resonant photonuclear isotope detection using medium-energy photon beam 2012-02-02T10:00:00-05:00 Author(s): Hiroyasu Ejiri and Tatsushi ShimaResonant photonuclear isotope detection (RPID) is a nondestructive detection/assay of nuclear isotopes by measuring γ rays following photonuclear reaction products. Medium-energy wideband photons of Eγ=12–16 MeV are used for the photonuclear (γ,n) reactions and γ rays characteristic of the reaction... (image) [Phys. Rev. ST Accel. Beams 15, 024701] Published Thu Feb 02, 2012
Equivalent circuit for postcoupler stabilization in a drift tube linac 2012-01-26T10:00:00-05:00 Author(s): Francesco GrespanPostcouplers (PCs) are devices used in order to reduce the effect of perturbations on the operating mode of a drift tube linac (DTL), using the resonant coupling stabilization method. In this article an equivalent circuit for a DTL equipped with PCs is presented, together with a 3D simulation analys... [Phys. Rev. ST Accel. Beams 15, 010101] Published Thu Jan 26, 2012
Modeling multiturn stripping injection and foil heating for high intensity proton drivers 2012-01-20T10:00:00-05:00 Author(s): A. I. Drozhdin, I. L. Rakhno, S. I. Striganov, and L. G. VorobievH- stripping injection into the Fermilab recycler ring, combined with a beam phase painting technique, has been considered. The multiparticle three-dimensional beam dynamics with space charge has been studied numerically, using STRUCT and ORBIT codes, for different painting scenarios. In order to ac... [Phys. Rev. ST Accel. Beams 15, 011002] Published Fri Jan 20, 2012
Neutralizing trapped electrons on the hydrogenated surface of a diamond amplifier 2012-01-20T10:00:00-05:00 Author(s): Xiangyun Chang, Ilan Ben-Zvi, Triveni Rao, John Smedley, Erdong Wang, Qiong Wu, and Tianmu XinWe discuss our investigation of electron trapping in a diamond amplifier (DA). Our previous work demonstrated that some electrons reaching the DA’s hydrogenated surface are not emitted. The state and the removal of these electrons is important for DA applications. We found that these stopped electro... (image) [Phys. Rev. ST Accel. Beams 15, 013501] Published Fri Jan 20, 2012
Extension of the Finite Integration Technique including dynamic mesh refinement and its application to self-consistent beam dynamics simulations 2012-01-20T10:00:00-05:00 Author(s): Sascha M. Schnepp, Erion Gjonaj, and Thomas WeilandAn extension of the framework of the Finite Integration Technique (FIT) including dynamic and adaptive mesh refinement is presented. After recalling the standard formulation of the FIT, the proposed mesh adaptation procedure is described. Besides the linear interpolation approach, a novel interpolat... (image) [Phys. Rev. ST Accel. Beams 15, 014401] Published Fri Jan 20, 2012
Quantum mechanical calculation of electron spin flip in a helical undulator 2012-01-19T10:00:00-05:00 Author(s): L. N. Hand and A. SkujaWe derive a four-component spinor wave function for an electron in a helical undulator which, in the relativistic limit, successfully reproduces all of the results of the classical calculation for the radiation angular distribution, polarization, and energy spectrum. This wave function also allows t... (image) [Phys. Rev. ST Accel. Beams 15, 010701] Published Thu Jan 19, 2012
Self-injection threshold in self-guided laser wakefield accelerators 2012-01-19T10:00:00-05:00 Author(s): S. P. D. Mangles, G. Genoud, M. S. Bloom, M. Burza, Z. Najmudin, A. Persson, K. Svensson, A. G. R. Thomas, and C.-G. WahlströmA laser pulse traveling through a plasma can excite large amplitude plasma waves that can be used to accelerate relativistic electron beams in a very short distance—a technique called laser wakefield acceleration. Many wakefield acceleration experiments rely on the process of wave breaking, or self-... (image) [Phys. Rev. ST Accel. Beams 15, 011302] Published Thu Jan 19, 2012
Electron beam optics and trajectory control in the Fermi free electron laser delivery system 2012-01-19T10:00:00-05:00 Author(s): S. Di Mitri, M. Cornacchia, C. Scafuri, and M. SjöströmElectron beam optics (particle betatron motion) and trajectory (centroid secular motion) in the FERMI@Elettra free electron laser (FEL) are modeled and experimentally controlled by means of the elegant particle tracking code. This powerful tool, well known to the accelerator community, is here for t... (image) [Phys. Rev. ST Accel. Beams 15, 012802] Published Thu Jan 19, 2012
Editorial: Outstanding PRST-AB Articles from 2010 2012-01-17T10:00:00-05:00 Author(s): Frank Zimmermann[Phys. Rev. ST Accel. Beams 15, 010001] Published Tue Jan 17, 2012
Design study of beam position monitors for measuring second-order moments of charged particle beams 2012-01-13T10:00:00-05:00 Author(s): Kenichi Yanagida, Shinsuke Suzuki, and Hirofumi HanakiThis paper presents a theoretical investigation on the multipole moments of charged particle beams in two-dimensional polar coordinates. The theoretical description of multipole moments is based on a single-particle system that is expanded to a multiparticle system by superposition, i.e., summing ov... (image) [Phys. Rev. ST Accel. Beams 15, 012801] Published Fri Jan 13, 2012
Simple formulas for theoretical minimum emittance in storage rings 2012-01-12T10:00:00-05:00 Author(s): Chun-xi Wang and Wen Wei HoWe present an analytical calculation of the theoretical minimum emittance in storage rings with arbitrary but nonreversing bending magnets. Our derivation is based on a dipole with a short segment of constant bending radius and linear ramps at the ends, which has been shown to be very close to the o... [Phys. Rev. ST Accel. Beams 15, 014001] Published Thu Jan 12, 2012
First high-power model of the annular-ring coupled structure for use in the Japan Proton Accelerator Research Complex linac 2012-01-10T10:00:00-05:00 Author(s): Hiroyuki Ao and Yoshishige YamazakiA prototype cavity for the annular-ring coupled structure (ACS) for use in the Japan Proton Accelerator Research Complex (J-PARC) linac has been developed to confirm the feasibility of achieving the required performance. This prototype cavity is a buncher module, which includes ten accelerating cell... (image) [Phys. Rev. ST Accel. Beams 15, 011001] Published Tue Jan 10, 2012
Formation of a novel shaped bunch to enhance transformer ratio in collinear wakefield accelerators 2012-01-10T10:00:00-05:00 Author(s): B. Jiang, C. Jing, P. Schoessow, J. Power, and W. GaiThe transformer ratio, characterizing the ratio of maximum accelerating field behind the drive bunch to the maximum decelerating field inside the drive bunch, is one of the key parameters for characterizing the performance of collinear wakefield accelerators. In this paper the use of electron drive ... [Phys. Rev. ST Accel. Beams 15, 011301] Published Tue Jan 10, 2012
Efficient ferromagnetic core impedance model with application to finite-difference time-domain simulation 2012-01-09T10:00:00-05:00 Author(s): T. C. Genoni, D. V. Rose, R. E. Clark, D. R. Welch, and W. A. StygarA frequency-dependent impedance model for laminated ferromagnetic cores is presented and analyzed. The model assumes a multiple-winding ferromagnetic induction core composed of multiple thin layers with linear material response. This model builds on the analysis presented by Rose et al. [ Phys. Rev... (image) [Phys. Rev. ST Accel. Beams 15, 010401] Published Mon Jan 09, 2012
Harmonic radiation of a relativistic nonlinear inverse Compton scattering using two laser wavelengths 2011-12-28T10:00:00-05:00 Author(s): Y. Sakai, O. Williams, G. Andonian, A. Fukasawa, E. Hemsing, A. Marinelli, S. Barber, F. H. O’Shea, and J. B. RosenzweigThe use of two different wavelength lasers in the nonlinear regime of the inverse Compton scattering interaction is proposed in order to provide a new strategy for controlling scattered photon energy distributions in the x-ray to γ-ray spectral region. In this nonlinear interaction, the component of... (image) [Phys. Rev. ST Accel. Beams 14, 120702] Published Wed Dec 28, 2011
Hollow-core photonic band gap fibers for particle acceleration 2011-12-28T10:00:00-05:00 Author(s): Robert J. Noble, James E. Spencer, and Boris T. KuhlmeyPhotonic band gap (PBG) dielectric fibers with hollow cores are being studied both theoretically and experimentally for use as laser driven accelerator structures. The hollow core functions as both a longitudinal waveguide for the transverse-magnetic (TM) accelerating fields and a channel for the ch... (image) [Phys. Rev. ST Accel. Beams 14, 121303] Published Wed Dec 28, 2011
Prediction of multipactor in the iris region of rf deflecting mode cavities 2011-12-13T10:00:00-05:00 Author(s): G. Burt and A. C. DexterMultipactor is a major cause of field limitation in many superconducting rf cavities. Multipacting is a particular issue for deflecting mode cavities as the typical behavior is not well studied, understood, or parametrized. In this paper an approximate analytical model for the prediction of multipac... (image) [Phys. Rev. ST Accel. Beams 14, 122002] Published Tue Dec 13, 2011
Photocathode behavior during high current running in the Cornell energy recovery linac photoinjector 2011-12-08T10:00:00-05:00 Author(s): Luca Cultrera, Jared Maxson, Ivan Bazarov, Sergey Belomestnykh, John Dobbins, Bruce Dunham, Siddharth Karkare, Roger Kaplan, Vaclav Kostroun, Yulin Li, Xianghong Liu, Florian Löhl, Karl Smolenski, Zhi Zhao, David Rice, Peter Quigley, Maury Tigner, Vadim Veshcherevich, Kenneth Finkelstein, Darren Dale, and Benjamin PichlerThe Cornell University energy recovery linac (ERL) photoinjector has recently demonstrated operation at 20 mA for approximately 8 hours, utilizing a multialkali photocathode deposited on a Si substrate. We describe the recipe for photocathode deposition, and will detail the parameters of the run. Po... [Phys. Rev. ST Accel. Beams 14, 120101] Published Thu Dec 08, 2011
X-band active-passive rf pulse compressor with plasma switches 2011-12-08T10:00:00-05:00 Author(s): A. L. Vikharev, O. A. Ivanov, A. M. Gorbachev, M. A. Lobaev, V. A. Isaev, S. G. Tantawi, J. R. Lewandowski, and J. L. HirshfieldAs proposed by SLAC, the efficiency of a pulse compressor of the SLED-II type could be increased by changing both the phase of the microwave source and the coupling coefficient of the delay line. In the existing SLED-II system at frequency 11.4 GHz, the resonant delay line is coupled with the source... [Phys. Rev. ST Accel. Beams 14, 121302] Published Thu Dec 08, 2011
Femtosecond x-ray pulse temporal characterization in free-electron lasers using a transverse deflector 2011-12-07T10:00:00-05:00 Author(s): Y. Ding, C. Behrens, P. Emma, J. Frisch, Z. Huang, H. Loos, P. Krejcik, and M-H. WangWe propose a novel method to characterize the temporal duration and shape of femtosecond x-ray pulses in a free-electron laser (FEL) by measuring the time-resolved electron-beam energy loss and energy spread induced by the FEL process, with a transverse radio-frequency deflector located after the un... [Phys. Rev. ST Accel. Beams 14, 120701] Published Wed Dec 07, 2011
Laser accelerated protons captured and transported by a pulse power solenoid 2011-12-07T10:00:00-05:00 Author(s): T. Burris-Mog, K. Harres, F. Nürnberg, S. Busold, M. Bussmann, O. Deppert, G. Hoffmeister, M. Joost, M. Sobiella, A. Tauschwitz, B. Zielbauer, V. Bagnoud, T. Herrmannsdoerfer, M. Roth, and T. E. CowanUsing a pulse power solenoid, we demonstrate efficient capture of laser accelerated proton beams and the ability to control their large divergence angles and broad energy range. Simulations using measured data for the input parameters give inference into the phase-space and transport efficiencies of... (image) [Phys. Rev. ST Accel. Beams 14, 121301] Published Wed Dec 07, 2011
Enhanced characterization of niobium surface topography 2011-12-06T10:00:00-05:00 Author(s): Chen Xu, Hui Tian, Charles E. Reece, and Michael J. KelleySurface topography characterization is a continuing issue for the superconducting radio frequency (SRF) particle accelerator community. Efforts are under way to both improve surface topography and its characterization and analysis using various techniques. In measurement of topography, power spectra... (image) [Phys. Rev. ST Accel. Beams 14, 123501] Published Tue Dec 06, 2011
Suppressing beam-centroid motion in a long-pulse linear induction accelerator 2011-12-05T10:00:00-05:00 Author(s): Carl Ekdahl, E. O. Abeyta, R. Archuleta, H. Bender, W. Broste, C. Carlson, G. Cook, D. Frayer, J. Harrison, T. Hughes, J. Johnson, E. Jacquez, B. Trent McCuistian, N. Montoya, S. Nath, K. Nielsen, C. Rose, M. Schulze, H. V. Smith, C. Thoma, and C. Y. TomThe second axis of the dual-axis radiography of hydrodynamic testing (DARHT) facility produces up to four radiographs within an interval of 1.6 μs. It does this by slicing four micropulses out of a 2-μs long electron beam pulse and focusing them onto a bremsstrahlung converter target. The 1.8-kA be... [Phys. Rev. ST Accel. Beams 14, 120401] Published Mon Dec 05, 2011 |
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