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Generation Of Angular Momentum Dominated Electron Beams From A Photoinjector
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Book Synopsis Generation of Angular-momentum-dominated Electron Beams from a Photoinjector by :
Download or read book Generation of Angular-momentum-dominated Electron Beams from a Photoinjector written by and published by . This book was released on 2004 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Various projects under study require an angular-momentum-dominated electron beam generated by a photoinjector. Some of the proposals directly use the angular-momentum-dominated beams (e.g. electron cooling of heavy ions), while others require the beam to be transformed into a flat beam (e.g. possible electron injectors for light sources and linear colliders). In this paper, we report our experimental study of an angular-momentum-dominated beam produced in a photoinjector, addressing the dependencies of angular momentum on initial conditions. We also briefly discuss the removal of angular momentum. The results of the experiment, carried out at the Fermilab/NICADD Photoinjector Laboratory, are found to be in good agreement with theoretical and numerical models.
Book Synopsis Effects on Flat-beam Generation from Space-charge Force and Beamline Errors by : Y.-E. Sun
Download or read book Effects on Flat-beam Generation from Space-charge Force and Beamline Errors written by Y.-E. Sun and published by . This book was released on 2005 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: The transformation of a round, angular-momentum-dominated electron beam produced in a photoinjector into a flat beam using a transformer composed of three skew-quadrupoles [1] has been developed theoretically [2, 3] and experimentally [4]. In this paper, we present numerical and analytical studies of space-charge forces, and evaluate the corresponding limits on the ratio of vertical-to-horizontal emittances. We also investigate the sensitivities of flat-beam emittances on the quadrupole misalignments in each of the six degrees of freedom.
Book Synopsis Advances in Imaging and Electron Physics by :
Download or read book Advances in Imaging and Electron Physics written by and published by Academic Press. This book was released on 2016-01-28 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Imaging and Electron Physics merges two long-running serials, Advances in Electronics and Electron Physics and Advances in Optical and Electron Microscopy. The series features extended articles on the physics of electron devices (especially semiconductor devices), particle optics at high and low energies, microlithography, image science, and digital image processing, electromagnetic wave propagation, electron microscopy, and the computing methods used in all these domains. Contains contributions from leading authorities on the subject matter Informs and updates on all the latest developments in the field of imaging and electron physics Provides practitioners interested in microscopy, optics, image processing, mathematical morphology, electromagnetic fields, electron, and ion emission with a valuable resource Features extended articles on the physics of electron devices (especially semiconductor devices), particle optics at high and low energies, microlithography, image science, and digital image processing
Book Synopsis Formation of Compressed Flat Electron Beams with High Transverse-emittance Ratios by :
Download or read book Formation of Compressed Flat Electron Beams with High Transverse-emittance Ratios written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Flat beams--beams with asymmetric transverse emittances--have important applications in novel light-source concepts and advanced-acceleration schemes and could possibly alleviate the need for damping rings in lepton colliders. Over the last decade, a flat beam generation technique based on the conversion of an angular-momentum-dominated beam was proposed and experimentally tested. In this paper we explore the production of compressed flat beams. We especially investigate and optimize the flat beam transformation for beams with substantial fractional energy spread. We use as a simulation example the photoinjector of Fermilab's Advanced Superconducting Test Accelerator. The optimizations of the flat beam generation and compression at Advanced Superconducting Test Accelerator were done via start-to-end numerical simulations for bunch charges of 3.2 nC, 1.0 nC, and 20 pC at ~37 MeV. The optimized emittances of flat beams with different bunch charges were found to be 0.25 [mu]m (emittance ratio is ~400), 0.13 [mu]m, 15 nm before compression, and 0.41 [mu]m, 0.20 [mu]m, 16 nm after full compression, respectively, with peak currents as high as 5.5 kA for a 3.2-nC flat beam. These parameters are consistent with requirements needed to excite wakefields in asymmetric dielectric-lined waveguides or produce significant photon flux using small-gap micro-undulators.
Book Synopsis Optimum Electron Distributions for Space Charge Dominated Beams in Photoinjectors by : P. R. Bolton
Download or read book Optimum Electron Distributions for Space Charge Dominated Beams in Photoinjectors written by P. R. Bolton and published by . This book was released on 2006 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: The optimum photo-electron distribution from the cathode of an RF photoinjector producing a space charge dominated beam is a uniform distribution contained in an ellipsoid. For such a bunch distribution, the space charge forces are linear and the emittance growth induced by those forces is totally reversible and consequently can be compensated. With the appropriate tuning of the emittance compensation optics, the emittance, at the end of photoinjector beamline, for an ellipsoidal laser pulse, would only have two contributions, the cathode emittance and the RF emittance. For the peak currents of 50A and 100 A required from the SBand and L-Band RF gun photoinjectors discussed here, the RF emittance contribution is negligible. If such an ellipsoidal photo-electron distribution were available, the emittance at the end of the beamline could be reduced to the cathode emittance. Its value would be reduced by more than 40% from that obtained using cylindrical shape laser pulses. This potentially dramatic improvement warrants review of the challenges associated with the production of ellipsoidal photo-electrons. We assume the photo-electrons emission time to be short enough that the ellipsoidal electron pulse shape will come directly from the laser pulse. We shift the challenge to ellipsoidal laser pulse shaping. To expose limiting technical issues, we consider the generation of ellipsoidal laser pulse shape in terms of three different concepts.
Book Synopsis Electron Beams with Orbital Angular Momentum by : Sophia Marriott Lloyd
Download or read book Electron Beams with Orbital Angular Momentum written by Sophia Marriott Lloyd and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Next Generation Photoinjector by : Dennis Thomas Palmer
Download or read book The Next Generation Photoinjector written by Dennis Thomas Palmer and published by . This book was released on 2005 with total page 181 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation will elucidate the design, construction, theory, and operation of the Next Generation Photoinjector (NGP). This photoinjector is comprised of the BNL/SLAC/UCLA 1.6 cell symmetrized S-band photocathode radio frequency (rf) electron gun and a single emittance-compensation solenoidal magnet. This photoinjector is a prototype for the Linear Coherent Light Source X-ray Free Electron Laser operating in the 1.5 {angstrom} range. Simulations indicate that this photoinjector is capable of producing a 1nC electron bunch with transverse normalized emittance less than 1 {pi} mm mrad were the cathode is illuminated with a 10 psec longitudinal flat top pulse. Using a Gaussian longitudinal laser profile with a full width half maximum (FWHM) of 10 psec, simulation indicates that the NGP is capable of producing a normalized rms emittance of 2.50 {pi} mm mrad at 1 nC. Using the removable cathode plate we have studied the quantum efficiency (QE) of both copper and magnesium photo-cathodes. The Cu QE was found to be 4.5 x 10{sup -5} with a 25% variation in the QE across the emitting surface of the cathode, while supporting a field gradient of 125 MV/m. At low charge, the transverse normalized rms emittance, {epsilon}{sub n, rms}, produced by the NGP is {epsilon}{sub n, rms} = 1.2 {pi} mm mrad for Q{sub T} = 0.3 nC. The 95% electron beam bunch length was measured to 10.9 psec. The emittance due to the finite magnetic field at the cathode has been studied. The scaling of this magnetic emittance term as a function of cathode magnetic field was found to be 0.01 {pi} mm mrad per Gauss. The 1.6 cell rf gun has been designed to reduce the dipole field asymmetry of the longitudinal accelerating field. Low level rf measurements show that this has in fact been accomplished, with an order of magnitude decrease in the dipole field. High power beam studies also show that the dipole field has been decreased. An upper limit of the intrinsic non-reducible thermal emittance of a photocathode under high field gradient was found to be {epsilon}{sub n, rms} = 0.8 {pi} mm mrad. Agreement is found between the theoretical calculation of the thermal emittance, {epsilon}{sub 0} = 0.62 {pi} mm mrad, and the experimental results, after taking into account all of the emittance contribution terms. The 1 nC emittance was found to be {epsilon}{sub n, rms} = 4.75 {pi} mm mrad with a 95% electron beam bunch length of 14.7 psec. Systematic bunch length measurements showed electron beam bunch lengthening due the electron beam charge. They will show that the discrepancy between measurement and simulation is due to three effects. The major effect is due to the variation of the QE in the photo-emitting area of the Cu cathode. Also, space charge emittance blowup in the transport line will be shown to be a significant effect because the electron beam is still in the space charge dominated regime. The last effect, which has been observed experimentally, is the electron bunch lengthening as a function of total electron bunch charge.
Book Synopsis Electron Beams with Orbital Angular Momentum by : Sophia M. Lloyd
Download or read book Electron Beams with Orbital Angular Momentum written by Sophia M. Lloyd and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Photoinjector Production of a Flat Beam with Transverse Emittance Ratio of 100 by : Y. E. Sun
Download or read book Photoinjector Production of a Flat Beam with Transverse Emittance Ratio of 100 written by Y. E. Sun and published by . This book was released on 2006 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: The generation of a flat electron beam directly from a photoinjector is an attractive alternative to the electron damping ring as envisioned for linear colliders. It also has potential applications to light sources such as the generation of ultrashort x-ray pulses or Smith-Purcell free electron lasers. In this paper, we report on the experimental generation of a flat beam with a measured transverse emittance ratio of 100 {+-} 20 for a bunch charge of {approx_equal} 0.5 nC. The experimental data, obtained at the Fermilab/NICADD Photoinjector Laboratory, are compared with numerical simulations and the expected scaling laws. Possible improvement of the experiment along with application for such a flat beams are discussed.
Book Synopsis An Engineering Guide to Photoinjectors by : Triveni Rao
Download or read book An Engineering Guide to Photoinjectors written by Triveni Rao and published by Createspace Independent Pub. This book was released on 2013-04-02 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is an introduction to the basic theory and engineering of advanced electron beam sources known as photoinjectors. Photoinjectors produce relativistic electrons for exciting new devices such as x-ray free electron lasers and the polarized beams for very high energy physics linear colliders. The chapters are written by renowned experts in the field who share their working knowledge of the technologies needed for designing and building photoinjectors.
Book Synopsis Theory and Design of Charged Particle Beams by : Martin Reiser
Download or read book Theory and Design of Charged Particle Beams written by Martin Reiser and published by John Wiley & Sons. This book was released on 2008-06-25 with total page 674 pages. Available in PDF, EPUB and Kindle. Book excerpt: This indispensable work offers a broad synoptic description of beams, applicable to a wide range of other devices, such as low-energy focusing and transport systems and high-power microwave sources. The monograph develops the material from the basic principles in a systematic way and discusses the underlying physics and validity of theoretical relationships, design formulas and scaling laws. Assumptions and approximations are clearly indicated throughout. This new, revised and updated edition has 10% additional content, and features, among others, a new chapter on beam physics research from 1993 to 2007, significant enhancement of chapter 6 on emittance variation, updated references and color image plates.
Book Synopsis Clamped Accelerating Structures for the Generation of High Brightness Electron Beams by : Eylene Pirez
Download or read book Clamped Accelerating Structures for the Generation of High Brightness Electron Beams written by Eylene Pirez and published by . This book was released on 2018 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation will illustrate the design, theory and fabrication of a new generation of radiofrequency (RF) photoinjector aimed at obtaining signicant improvements in beam brightness, through an innovative accelerating cavity design, with minimized RF breakdown rates and a novel fabrication technique. The UCLA 1.4 cell RF photoinjector has been inspired by the SPARC (LNF-INFN, Italy) 1.6 cell RF electron gun currently operating in the Pegasus beamline. Using the clamping technique with the INFN proprietary-design gaskets, the fabrication for the 1.4 cell photoinjector the INFN can be completed without any brazing process. Careful rounding of all the inside surfaces allows better management of the pulsed heating temperature rise that largely contributes to the rf breakdown limits of older generations of high gradient electron guns. Finally, the clamping technique and innovative gasket design offers a lower risk assembly and lower fabrication costs. The UCLA 1.4 cell rf electron gun has been designed to operate at a 120MV/m gradient and an optimal injection phase of 70 degrees in order to increase the extraction field experienced by the electrons at photo-emission by a factor of 1.9 compared to the one in the standard 1.6 cell design running at the same peak eld. The maximum achievable beam brightness in a RF photogun depends on the extraction eld with a scaling which diers for the various regimes of operation (cigar, pancake, blowout). Nevertheless, for all cases, improving the extraction field improves the beam brightness at least linearly regardless of operating regime. From the electromagnetic point of view the gun presents a large mode separation, an extra pumping port for dipole moment compensation, a racetrack full cell geometry for quadrupole moment compensation, strongly rounded elliptical iris and coupler for minimal pulsed heating. The electron gun has also been designed to be compatible with several cutting edge experiments. The inclusion of oblique incidence laser ports allows for short focal length laser illumination on the cathode to generate ultra-low emittance bunches as demonstrated in recent experiments. The new photoinjector is also compatible with a load-lock chamber to test advanced photocathodes, such as alkali antimonide cathodes. These promising materials have yet to be tested in high gradient accelerating cavities due to the lack of an ultra-high vacuum (UHV) storage system that is capable of loading cathodes into the injector without breaking vacuum. The clamping technique has proven useful in the assembly of accelerating cavities. In the last chapter of this thesis, we will also discuss the design and use of the clamping method in the realization of an X-band deflecting cavity that will play a role in the future ultrafast electron diffraction (UED) experiments at UCLA. The goal of the new deflecting cavity is to develop an innovative, inexpensive and low energy UED system that provides short bunches and others improvements in the temporal resolution of ultrafast electron diffraction measurements.
Book Synopsis First Demonstration of Electron Beam Generation and Characterization with an All Superconducting Radio-frequency (SRF) Photoinjector by :
Download or read book First Demonstration of Electron Beam Generation and Characterization with an All Superconducting Radio-frequency (SRF) Photoinjector written by and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In preparation for a high brightness, high average current electron source for the energy-recovery linac BERLinPro an all superconducting radio-frequency photoinjector is now in operation at Helmholtz-Zentrum Berlin. The aim of this experiment is beam demonstration with a high brightness electron source able to generate sub-ps pulse length electron bunches from a superconducting (SC) cathode film made of Pb coated on the backwall of a Nb SRF cavity. This paper describes the setup of the experiment and first results from beam measurements.
Book Synopsis Generation and Study of Relativistic Electron Beams by : K. C. Mittal
Download or read book Generation and Study of Relativistic Electron Beams written by K. C. Mittal and published by . This book was released on 1977 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Observing Orbital Angular Momentum Transfer from Electron Vortex Beam to Matter by : Hannah DeVyldere
Download or read book Observing Orbital Angular Momentum Transfer from Electron Vortex Beam to Matter written by Hannah DeVyldere and published by . This book was released on 2017 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is possible to produce electron beams with non-zero orbital angular momentum. Such beams, known as electron vortex beams, are theoretically able to transfer their orbital angular momenta to matter, causing the matter to rotate. Nanoparticles in an aqueous solution were observed with an electron vortex beam to detect the transfer of orbital angular momentum in a low-friction environment. Observing the transfer of orbital angular momentum to particles in solution is difficult due to the necessity of imaging the particles through a liquid and the random movement of particles in the solution. Thus, orbital angular momentum transfer to matter could not conclusively be observed in this environment. Initial data, observations, and a discussion of ways to eliminate particle movement, increase image quality, and reduce uncertainty of particle movement while observing orbital angular momentum transfer are discussed. Research was conducted in the Material Science Institute at the University of Oregon under the advisement of B. McMorran.
Book Synopsis Generation and Propagation of Large-area Electron Beams by :
Download or read book Generation and Propagation of Large-area Electron Beams written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Single Bunched Beam Generation Using Conventional Electron Gun for JLC Injector by : T. Naito
Download or read book Single Bunched Beam Generation Using Conventional Electron Gun for JLC Injector written by T. Naito and published by . This book was released on 1991 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt:
