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First Demonstration Of Electron Beam Generation And Characterization With An All Superconducting Radio Frequency Srf Photoinjector
Download First Demonstration Of Electron Beam Generation And Characterization With An All Superconducting Radio Frequency Srf Photoinjector full books in PDF, epub, and Kindle. Read online First Demonstration Of Electron Beam Generation And Characterization With An All Superconducting Radio Frequency Srf Photoinjector ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
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 Investigations and Applications of Field- and Photo-emitted Electron Beams from a Radio Frequency Gun by :
Download or read book Investigations and Applications of Field- and Photo-emitted Electron Beams from a Radio Frequency Gun written by and published by . This book was released on 2015 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt: Production of quality electron bunches using e cient ways of generation is a crucial aspect of accelerator technology. Radio frequency electron guns are widely used to generate and rapidly accelerate electron beams to relativistic energies. In the current work, we primarily study the charge generation processes of photoemission and eld emission inside an RF gun installed at Fermilab's High Brightness Electron Source Laboratory (HBESL). Speci cally, we study and characterize second-order nonlinear photoemission from a Cesium Telluride (Cs2Te) semiconductor photocathode, and eld emission from carbon based cathodes including diamond eld emission array (DFEA) and carbon nanotube (CNT) cathodes located in the RF gun's cavity. Finally, we discuss the application experiments conducted at the facility to produce soft x-rays via inverse Compton scattering (ICS), and to generate uniformly lled ellipsoidal bunches and temporally shaped electron beams from the Cs2Te photocathode.
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 Reviews Of Accelerator Science And Technology - Volume 5: Applications Of Superconducting Technology To Accelerators by : Alexander Wu Chao
Download or read book Reviews Of Accelerator Science And Technology - Volume 5: Applications Of Superconducting Technology To Accelerators written by Alexander Wu Chao and published by World Scientific. This book was released on 2013-01-28 with total page 369 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the past several decades major advances in accelerators have resulted from breakthroughs in accelerator science and accelerator technology. After the introduction of a new accelerator physics concept or the implementation of a new technology, a leap in accelerator performance followed. A well-known representation of these advances is the Livingston chart, which shows an exponential growth of accelerator performance over the last seven or eight decades. One of the breakthrough accelerator technologies that support this exponential growth is superconducting technology. Recognizing this major technological advance, we dedicate Volume 5 of Reviews of Accelerator Science and Technology (RAST) to superconducting technology and its applications.Two major applications are superconducting magnets (SC magnets) and superconducting radio-frequency (SRF) cavities. SC magnets provide much higher magnetic field than their room-temperature counterparts, thus allowing accelerators to reach higher energies with comparable size as well as much reduced power consumption. SRF technology allows field energy storage for continuous wave applications and energy recovery, in addition to the advantage of tremendous power savings and better particle beam quality. In this volume, we describe both technologies and their applications. We also include discussion of the associated R&D in superconducting materials and the future prospects for these technologies.
Book Synopsis Low Emittance Electron Beam Production and Characterization with a 17 GHz Photocathode RF Gun by : Winthrop Joseph Brown
Download or read book Low Emittance Electron Beam Production and Characterization with a 17 GHz Photocathode RF Gun written by Winthrop Joseph Brown and published by . This book was released on 2001 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: (Cont.) Even higher brightness could be achieved with a higher electron beam energy of 2 MeV; however, RF breakdown in the tested structures limited the beam energy to about 1 MeV. Results were also obtained for the 2.4 cell RF gun. While this gun provided a modest increase in beam energy to 1.25 MeV, the presence of undesirable quadrupole modes in the structure led to a lower beam brightness. Techniques for further improvement of the RF gun are described.
Book Synopsis Electron Beam Production and Characterization for the PLEIADES Thomson X-ray Source by :
Download or read book Electron Beam Production and Characterization for the PLEIADES Thomson X-ray Source written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We report on the performance of an S-band RF photocathode electron gun and accelerator for operation with the PLEIADES Thomson x-ray source at LLNL. Simulations of beam production, transport, and focus are presented. It is shown that a 1 ps, 500 pC electron bunch with a normalized emittance of less than 5 [pi]mm-mrad can be delivered to the interaction point. Initial electron measurements are presented. Calculations of expected x-ray flux are also performed, demonstrating an expected peak spectral brightness of 102° photons/s/mm2/mrad2/0.1% bandwidth. Effects of RF phase jitter are also presented, and planned phase measurements and control methods are discussed.
Book Synopsis Design of a High-bunch-charge 112-MHz Superconducting RF Photoemission Electron Source by :
Download or read book Design of a High-bunch-charge 112-MHz Superconducting RF Photoemission Electron Source written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: High-bunch-charge photoemission electron-sources operating in a continuous wave (CW) mode are required for many advanced applications of particle accelerators, such as electron coolers for hadron beams, electron-ion colliders, and free-electron lasers (FELs). Superconducting RF (SRF) has several advantages over other electron-gun technologies in CW mode as it offers higher acceleration rate and potentially can generate higher bunch charges and average beam currents. A 112 MHz SRF electron photoinjector (gun) was developed at Brookhaven National Laboratory (BNL) to produce high-brightness and high-bunch-charge bunches for the Coherent electron Cooling Proof-of-Principle (CeC PoP) experiment. Lastly, the gun utilizes a quarter-wave resonator (QWR) geometry for assuring beam dynamics, and uses high quantum efficiency (QE) multi-alkali photocathodes for generating electrons.
Book Synopsis Soviet Research on the Transport of Intense Relativistic Electron Beams Through High-pressure Air by : Nikita Wells
Download or read book Soviet Research on the Transport of Intense Relativistic Electron Beams Through High-pressure Air written by Nikita Wells and published by . This book was released on 1987 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: Soviet research on the propagation of intense relativistic electron beams (IREB) through fairly high-pressure air (pressure range 0.1 to 760 Torr) since the early 1970s has included the study of the plasma channel created by the passage of the electron beam through air, the resistive hose instability and its effect on beam propagation, the effect of self-fields, current enhancement, gas expansion, return currents, inherent beam energy spread, and other factors. This report covers Soviet developments in IREB propagation through air where the beam is not focused by external magnetic fields. The information was obtained from Soviet open-source publications with emphasis given to the last ten years of beam propagation in the Soviet Union. The volume of papers published on this subject in recent years indicates a significant increase in Soviet research in this area.
Book Synopsis Investigations and Applications of Field- and Photo-emitted Electron Beams from a Radio Frequency Gun by : Sriharsha Panuganti
Download or read book Investigations and Applications of Field- and Photo-emitted Electron Beams from a Radio Frequency Gun written by Sriharsha Panuganti and published by . This book was released on 2015 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt: Production of quality electron bunches using efficient ways of generation is a crucial aspect of accelerator technology. Radio frequency electron guns are widely used to generate and rapidly accelerate electron beams to relativistic energies. In the current work, we primarily study the charge generation processes of photoemission and field emission inside an RF gun installed at Fermilab's High Brightness Electron Source Laboratory (HBESL). Specifically, we study and characterize second-order nonlinear photoemission from a Cesium Telluride (Cs2Te) semiconductor photocathode, and field emission from carbon based cathodes including diamond field emission array (DFEA) and carbon nanotube (CNT) cathodes located in the RF gun's cavity. Finally, we discuss the application experiments conducted at the facility to produce soft x-rays via inverse Compton scattering (ICS), and to generate uniformly filled ellipsoidal bunches and temporally-shaped electron beams from the Cs 2Te photocathode.
Book Synopsis Design, Construction, and Testing of a Radiofrequency Electron Photoinjector for the Next Generation Linear Collider by : Eric Ralph Colby
Download or read book Design, Construction, and Testing of a Radiofrequency Electron Photoinjector for the Next Generation Linear Collider written by Eric Ralph Colby and published by . This book was released on 1997 with total page 614 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 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 Proceedings of the Fourth Symposium on Electron Beam Processes, March 29 and 30, 1962, Boston, Massachusetts by :
Download or read book Proceedings of the Fourth Symposium on Electron Beam Processes, March 29 and 30, 1962, Boston, Massachusetts written by and published by . This book was released on 1962 with total page 530 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Beam Test of a Superconducting Cavity for the Fermilab High-brightness Electron Photo-injector by :
Download or read book Beam Test of a Superconducting Cavity for the Fermilab High-brightness Electron Photo-injector written by and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: An electron photo-injector facility has been constructed at Fermilab for the purpose of providing a 14 18 MeV elec-tron beam with high charge per bunch (8 nC), short bunch length (1 mm RMS), and small transverse emittance [1]. The facility was used to commission a second-generation photo-cathode RF gun for the TeSLA Test Facility (TTF) Linac at DESY [2, 3]; in the future, the Fermilab electron beam will be used for R & D in bunch length compres-sion, beam diagnostics, and new acceleration techniques. Acceleration beyond 4 MeV is provided by a 9-cell super-conducting cavity (see Figure 1). The cavity also provides a longitudinal position-momentum correlation for subse-quent bunch length compression. We report on the RF tests and a first beam test of this cavity.
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 Proceedings of the Second Symposium on Electron Beam Processes, March 24, 25, 1960, Boston, Massachusetts by : Symposium on Electron Beam Processes
Download or read book Proceedings of the Second Symposium on Electron Beam Processes, March 24, 25, 1960, Boston, Massachusetts written by Symposium on Electron Beam Processes and published by . This book was released on 1960 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Electron Beam Evolution and Radio Emission in the Inhomogeneous Solar Corona by : Heather Ratcliffe
Download or read book Electron Beam Evolution and Radio Emission in the Inhomogeneous Solar Corona written by Heather Ratcliffe and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis considers the propagation of accelerated electron beams in plasma. We consider the wave particle interactions these undergo which cause their evolution, the effects of plasma density inhomogeneities on these interactions, and the effects this may have on the production of hard X-ray and radio emission by the beam. Chapter 1 introduces the important background material on the Sun and solar flares, and some basic plasma physics. We discuss the acceleration and propagation of electrons beams and their production of hard X-ray emission, and the various observed types of radio emission from the Sun. We end by discussing details of the mechanism by which radio emission can be produced by beam generated Langmuir waves at GHz frequencies. Chapter 2 contains the mathematical derivation of the effects of plasma density fluctuations on Langmuir waves. This is found to be described by a diffusion of the waves in wavenumber space. We consider the situation in both one and three dimensions, for elastic and inelastic scattering of the Langmuir waves, discussing how our model expands on that previously considered in the literature, and develop a model for the fluctuations applicable to the electron beams we consider in this thesis. We derive the relevant diffusion coefficients for a few commonly observed density fluctuation spectra, then end with a brief discussion of the expected effects of the Langmuir wavenumber diffusion on the waves and electrons for a few representative cases. Chapter 3 uses the model derived in Chapter 2 in quasi-linear simulations of electron beam evolution. We consider two initial electron beam distributions, either a Maxwellian or a power law, and simulate the Langmuir wave generation and evolution, and the back-reaction of this on the electron beam. We find an electron acceleration effect to occur, and explore the parameters for which this is strongest. In addition we consider the production of hard X-ray emission from an initially power law beam, and the effects of the electron acceleration on this. Chapter 4 considers the radio emission from an electron beam via the generation of Langmuir waves. We first derive an angle-averaged model for emission at the second harmonic of the plasma frequency, and combine this with the simulations from the previous chapters. We include the effects of density fluctuations on the Langmuir waves, and discuss how this affects the radio emission produced. Chapter 5 concludes the thesis with a summary of the effects of density inhomogeneity on Langmuir waves, and consequently on fast electron beams and their hard X-ray and radio emissions in the solar corona. Appendix 1 contains the derivation of a mathematical model for radio emission from an electron beam at the fundamental of the local plasma frequency, which is unimportant in the parameter ranges considered in Chapter 4, but essential for radio bursts in the higher corona and solar wind.
