| title: | Phosphor Settling Procedure |
| format: | preprint |
| year: | |
| 0 authors: | unknown |
| abstract: | |
| keywords: | |
| Details | edit | delete | |
| title: | Status of the Kurchatov Undulator, April 15, 1991 |
| format: | preprint |
| year: | April 15, 1991 |
| 0 authors: | unknown |
| abstract: | |
| keywords: | |
| Details | edit | delete | |
| title: | LabVIEW Virtual Instruments Instruction Manual, Version 1.0 |
| format: | preprint |
| year: | 1991 |
| 0 authors: | unknown |
| abstract: | This document describes a set of LabVIEW Virtual Instruments (VI's) for use in the Saturnus lab. The purpose of the software library is to allow users to easily make "programs" for the CAMAC modules in our lab. The library contains all the low level controls needed to interface to the CAMAC crate. The task of controlling the modules is thus reduced to an almost trivial level. This manual describes the library. Fundamentals of CAMAC programming are also mentioned. It is assumed that the reader has a basic working knowledge of LabVIEW. |
| keywords: | |
| Details | edit | delete | |
| title: | CAMAC Educational Material |
| format: | preprint |
| year: | 7/22/1991 |
| 0 authors: | unknown |
| abstract: | This handout contains copies of mini-tutorials from various company catalogs. The two introductions to the CAMAC standard are worth while reading for all group members. The two GPIB reviews are useful for anyone using or planning on using GPIB instruments. Finally, a handy glossary is attached. |
| keywords: | |
| Details | edit | delete | |
| title: | DOE Review |
| format: | preprint |
| year: | February 17, 1993 |
| 0 authors: | unknown |
| abstract: | |
| keywords: | |
| Details | edit | delete | |
| title: | Status of UCLA IR FEL |
| format: | preprint |
| year: | 1996 |
| 21 authors: | | | | | | | | | | | | | | | | | | | | | |
| abstract: | |
| keywords: | |
| Download | View | Details | edit | delete | |
| title: | Experimental Experience in High Brightness Beams and SASE FELs at UCLA |
| format: | preprint |
| year: | June 6, 2002 |
| 1 author: | |
| abstract: | Outline: Introduction to the UCLA Particle Beam Physics Laboratory (PBPL) High Brightness Beam Generation and Manipulation SASE FELs: Experimental Results Future work at UCLA |
| keywords: | |
| Download | View | Details | edit | delete | |
| title: | Energy Loss and Accelerating Field in the Plasma Wakefield Accelerator |
| format: | preprint |
| year: | 2003 |
| 4 authors: | | | | |
| abstract: | |
| keywords: | |
| Download | View | Details | edit | delete | |
| title: | A Plasma-Assisted High-Brightness X-Ray Source via Inverse Compton Scattering |
| format: | preprint |
| year: | 2003 |
| 3 authors: | | | |
| abstract: | |
| keywords: | |
| Download | View | Details | edit | delete | |
| title: | Short Pulse and Diagnostic Beamline Characteristics |
| format: | preprint |
| year: | April 10, 1991 |
| 1 author: | |
| abstract: | |
| keywords: | |
| Details | edit | delete | |
| title: | Degradation of Longitudinal Phase Space Distribution of the LCLS Beam by Compton Back-Scattering |
| format: | preprint |
| year: | January 24, 1993 |
| 1 author: | |
| abstract: | The requirements on the phase and amplitude jitter of the photoinjector laser in teh LCLS are very stringent. These can be eased if the incoherent energy spread in the beam is increased, decreasing the sensitivity of the bunch compression process. There are few good ways of increasing the incoherent, as opposed to the coherent, energy spread, which can be easily increased by rephasing the rf, or by space charge. A radiative or a collisional process must be used to increase the incoherent energy spread, in order to make the energy change independent of phase. Here we examine the feasibility of using the back-scattering of photons from an intense, one picosecond laser beam. We assume that we can use a laser beam (1047 nm wavelength, Nd:YLF), chosen to allow it to drive both the cathode (after quadrupling), and the longitudinal phase space degrader. |
| keywords: | |
| Details | edit | delete | |
| title: | The Photocathode Gun: Shunt Impedance and Field Balance |
| format: | preprint |
| year: | April 26, 1993 |
| 1 author: | |
| abstract: | |
| keywords: | |
| Details | edit | delete | |
| title: | Redesign of the Low Energy Beam Transport in the UCLA Photoinjector |
| format: | preprint |
| year: | June 24, 1993 |
| 1 author: | |
| abstract: | The low energy transport of the beam in teh UCLA photoinector has been the source of experimental difficulties associated with preserving the emittance and the pulse length while the beam experience large self-forces due to space charge. While some of the difficulties (most notably the pulse lengthening) can be mitigated by previous experiments, a major improvement should result from minimixing the low energy beam transport region from teh gun to the linac. |
| keywords: | |
| Details | edit | delete | |
| title: | RF Photoinjectors: A Guide to Performance Requirements and Demands on Laser Systems |
| format: | preprint |
| year: | 1994 |
| 1 author: | |
| abstract: | This paper describes the demands on drive laser performance made by the performance expected of present and future rf photocathode injectors. We review the relevant charged particle beam physics of rf photocathode guns as well as the technology and physics applications of these devices. The role of the drive laser is examined within this context. Several examples of demanding future rf photoinjector systems are discussed. |
| keywords: | |
| Details | edit | delete | |
| title: | Report of the Working Group on Electron Sources |
| format: | preprint |
| year: | 1994 |
| 2 authors: | | |
| abstract: | We report in this paper on the activities of the working group on electron sources at the Advanced Accelerator Workshop held in Lake Geneva, Wisconsin in June 1994. The discussion, while dominated by the subject of rf photoinjectors, included explorations of many novel areas in the state-of-the-art in electron source reserach and development. The major points raised at the workshop are examined, and a guide to the detailed reports of the members of the working group is provided. |
| keywords: | |
| Details | edit | delete | |
| title: | The SATURNUS Modulator |
| format: | preprint |
| year: | 1991 |
| 1 author: | |
| abstract: | A Free Electron Laser operating in the infrared region is under contstruction at UCLA. It will be driven by a compact 20 MeV linac, and a high brightness RF electron gun will be used as the injector. |
| keywords: | |
| Details | edit | delete | |
| title: | Development of a Compact Focusing Solenoid for Photocathode Guns |
| format: | preprint |
| year: | 1993 |
| 1 author: | |
| abstract: | A compact solenoid is being developed for the purpose of focusing an electron beam exiting a RF/photocathode electron gun. The size and power consumption of the solenoids in place make a smaller, more efficient solenoid desirable. The present state of this design is shown, including the physical appearance and field profile. |
| keywords: | |
| Details | edit | delete | |
| title: | SATURNUS Quadrupole Magnet Field Preliminary Measurements |
| format: | preprint |
| year: | 1992 |
| 2 authors: | | |
| abstract: | |
| keywords: | |
| Details | edit | delete | |
| title: | Comparison of the FEL and CSR Instabilities |
| format: | preprint |
| year: | April 19, 2002 |
| 1 author: | |
| abstract: | FEL and CSR instabilities have same principle of interaction between electron beam and synchrotron radiation, but the signature is different for the different longitudinal scales. Beside the FEL these instabilities are regarded as degrading affects on the beam properties, imposing limitation on the operation range of the accelerator. |
| keywords: | |
| Download | View | Details | edit | delete | |
| title: | Pulsed Wire Measurements of the UCLA/Kurchatov Undulator at LANL |
| format: | preprint |
| year: | 1993 |
| 1 author: | |
| abstract: | An undulator magnet designed and built by the Kurchatov Institute in Russia for the UCLA FEL program has been characterized using the pulsed wire method at the Los Alamos National laboratory (LANL). The pulsed wire is better suited to measuring off axis fields than the previously employed Hall probes. The speed and simplicity of the pulsed wire measurements also affords more rapid tuing and correction of undulators. Results from both methods are presented here and shown to compare favorably. The on axis second integral of the undulator field is found to be uniform. There are entrance quadrupole as well as entrance dipole fields in the undulator; however, as is discussed in the paper, these fields do not present a problem. There is also a quadrupole component throughout the undulator. Further numerical analysis of the data is required, but the magnitude appears to be small. The experimental arrangement used is described in detail in the hopes of implementing such a system at UCLA. |
| keywords: | |
| Details | edit | delete | |
| title: | Some Performance Parameters and Figures of Merit for Photoinjector Drive Lasers |
| format: | preprint |
| year: | 2002 |
| 1 author: | |
| abstract: | |
| keywords: | |
| Details | edit | delete | |
| title: | Free-Electron Simulations at Short Wavelengths |
| format: | preprint |
| year: | May 01, 2002 |
| 1 author: | |
| abstract: | Outline: FEL Simulations Overview Codes Shot-Noise Models Short Wavelength Effects Spontaneous Radiation Wake Fields Undulator Description Start-End Simulations |
| keywords: | |
| Download | View | Details | edit | delete | |
| title: | The VISA FEL: an ultra-short gain length, saturated, self-amplified spontaneous emission free-electron laser |
| format: | preprint |
| year: | May 31, 2002 |
| 1 author: | |
| abstract: | |
| keywords: | |
| Download | View | Details | edit | delete | |
| title: | Velocity Bunching: ORION, PLEIADES and NEPTUNE |
| format: | preprint |
| year: | May 3, 2002 |
| 1 author: | |
| abstract: | |
| keywords: | |
| Download | View | Details | edit | delete | |
| title: | Accelerator and Charged Particle Beam Physics at UCLA |
| format: | preprint |
| year: | March 2002 |
| 1 author: | |
| abstract: | Outline: What do we do? Who is involved What is current highlights of the research and education programs? Where are the future opportunities |
| keywords: | |
| Download | View | Details | edit | delete | |
| title: | Monitoring and Manipulation of Sub-picosecond Beams |
| format: | preprint |
| year: | May 30, 2002 |
| 1 author: | |
| abstract: | Outline: Applications of sub-picosecond beams: a UCLA-centric view Sub-picosecond beam generation Sub-picosecond beam manipulation Sub-picosecond beam diagnosis The future |
| keywords: | |
| Download | View | Details | edit | delete | |
| title: | Modeling Photo-desorption in High Current Storage Rings |
| format: | preprint |
| year: | 1991 |
| 1 author: | |
| abstract: | A phenomenological model of photo-desorption that includes effects of dose dependence and diffuse photon reflection allows one to compute the leveling of gas loads high current storage rings that typify heavy flavor factories. The model also permits one to estimate chamber commissioning times. |
| keywords: | |
| Details | edit | delete | |
| title: | 3.5 Cell R.F. Gun Simulation with Spacecharge and Focusing Coil U.C.L.A. IRFEL Note H.1 |
| format: | preprint |
| year: | November 9, 1989 |
| 1 author: | |
| abstract: | Using the particle simulation code PARMELA, I calculated the emittance values for a three and one half cell gun. Since the beam suffers a R.F. defocusing at the exit of the last cell a solenoidal focusing element was added to cancel the divergence effect. |
| keywords: | |
| Details | edit | delete | |
| title: | Design of the Vacuum System for the High Energy Ring of an Asymmetric B-Factory Based on PEP |
| format: | preprint |
| year: | 1991 |
| 4 authors: | | | | |
| abstract: | The multi-ampere currents required for high luminosity operation of an asymmetric B factory leads to extremely stressing requirements on a vacuum system suitable for maintaining long beam-gas lifetimes and acceptable background levels in the dtector. We present the design for a Cu alloy vacuum chamber and its associated pumping system for the 9GeV electron storage ring of the proposed B factory based on PEP. The excellent thermal and photo-desorption properties of Cu allows handling the high photon flux in a conventional, single chamber design with distributed ion pumps. The x-ray opacity of the Cu is sufficiently high that no additional lead shielding is necessary to protect the dipoles from the intense synchrotron radtiation generated by the beam. The design allows chamber commissioning in <500 hr of operation. |
| keywords: | |
| Details | edit | delete | |
| title: | PARMELA Simulation of the SATURNUS Compact 20 MeV linac |
| format: | preprint |
| year: | 11-11-91 |
| 2 authors: | | |
| abstract: | The R.F. photoinjector and Plane WAve Transformer have been modeled in the past 1. The results of these simulations have shown that ther eis an optimum parameter space to operate in. Optimum meaning parameters which give a picosecond, low emittance and low energy spread beam. |
| keywords: | |
| Details | edit | delete | |
| title: | Vacuum Design for a Superconducting Mini-collider |
| format: | preprint |
| year: | 1991 |
| 2 authors: | | |
| abstract: | The phi factory (Superconducting Mini-Collider or SMAC) proposed for construction at UCLA is a single storage rign with circulating currents of 2A each of electrons and positrons. The small circumference exacerbates the difficulties of handling the gas load due to photo-desorption from the chamber walls. We analyze the vacuum system for the phi factory to specify design choices. |
| keywords: | |
| Details | edit | delete | |
| title: | Cold Test Measurements of the UCLA Photo-Injector |
| format: | preprint |
| year: | April 30, 1993 |
| 2 authors: | | |
| abstract: | |
| keywords: | |
| Details | edit | delete | |
| title: | Quadrupole Magnets Measurement |
| format: | preprint |
| year: | 1992 |
| 3 authors: | | | |
| abstract: | Field measurement as a function of position and current of the SATURNUS compact accelerator's quadrupole magnets was carried out using a Hall probe mounted on a simple carriage setup consisting of 3 precision linear translators and a 360-degree rotator. From this measurement, the displacement of the magnetic center from the geometric center and the effective length of each quadrupole were calculated. Also, changes in the measured magnetic field of one quadrupole due to the effect of its disassembly and reassembling were investigated. The results are reported in this paper. |
| keywords: | |
| Details | edit | delete | |
| title: | Measurement of the Dipole Magnets |
| format: | preprint |
| year: | 1993 |
| 4 authors: | | | | |
| abstract: | The four Saturnus dipole magnets were calibrated with a Hall probe using a machinist's rotary table and a stepping motor to vary position. The setup was controlled by a Macintosh LC computer using LabView software. The field vs. current relationship was also measured. Single particle motion through the magnet was simulated, making a comparison of the real magnet to an ideal one. |
| keywords: | |
| Details | edit | delete | |
| title: | High Brightness Symmetric Emittance RF Photoinjector Preliminary Design Report |
| format: | preprint |
| year: | September 15, 1994 |
| 3 authors: | | | |
| abstract: | A preliminary design for a high bunch charge (8 nC), low emittance (> 20 mm-mr) radiofrequency electron photoinjector matched to the requirements of the Tesla Test Facility is presented. A 1.5 cell iris coupled pi-mode structure with high average accelerating gradient is chosen for its high shunt impedance, simplicity, and ability to accommodate an externally mounted solenoid for simultaneous beam divergence control an demittance compensation. Beam optics are optimized for an overall injector consisting of the electron gun followed by one linac capture section, a dipole chicane for magnetic bunch compression to achieve a bunch length corresponding to sigma_z = 1 mm. Electrical and beam dynamical aspects of the photoinjector design are presented. A description of the proposed experimental program is included. |
| keywords: | |
| Details | edit | delete | |
| title: | 25 MeV Injector for the Plasma Beat Wave Accelerator |
| format: | preprint |
| year: | 1994 |
| 5 authors: | | | | | |
| abstract: | |
| keywords: | |
| Details | edit | delete | |
| title: | Focusing of a Relativistic Electron Beam by an Underdense Plasma Lens |
| format: | preprint |
| year: | 1994 |
| 5 authors: | | | | | |
| abstract: | Plasma Lenses produce focusing gradients exceeding those of conventional quadrupole magnets by several orders of magnitude. We have recently observed dynamic focusing by an overdense plasma lens [G. Hairapetian, et al., Phys.Rev.Lett. 72, 2403 (1994)]. Theoretically, an underdense plasma lens could offer several advantages over the overdense lens: ... |
| keywords: | |
| Details | edit | delete | |
| title: | Modeling of the X-ray Radiation Dependence on Power in High Gradient Radio-frequency Accelerator Structures |
| format: | preprint |
| year: | October 9, 1995 |
| 2 authors: | | |
| abstract: | It has long been known that field-emitted (FE) electron current is what generates the x-ray radiation from high-power RF accelerating strucutures, but it has not yet been qualitatively understood how the radiation varies with the microwave power input to these structures. This paper will show that from successive measurements of the RF power at a single position and the corresponding radiation dose rate ... |
| keywords: | |
| Details | edit | delete | |
| title: | 1.5 Cell R.F. Gun Simulation with coil and Space Charge U.C.L.A. IRFEL Note H.3 |
| format: | preprint |
| year: | January 9, 1990 |
| 1 author: | |
| abstract: | Simulations were done to explore the effect of placing a coil along the beamline to minimize the divergent lense effect of the exit of the last cell of the gun....etc. |
| keywords: | |
| Details | edit | delete | |
| title: | PARMELA simulation of the U.C.L.A. compact linac |
| format: | preprint |
| year: | February 11, 1991 |
| 1 author: | |
| abstract: | The compact laser-driven R.F. linac for the SATURNUS project has been modeled using the particle dynamics simulation code PARMELA....etc. |
| keywords: | |
| Details | edit | delete | |
| title: | Photocathode Emission: The effects of high bandwidth drive lasers on thermal emittance |
| format: | preprint |
| year: | 2003 |
| 1 author: | |
| abstract: | |
| keywords: | |
| Details | edit | delete | |
| title: | Memo: RF Power for the PWT LInac |
| format: | preprint |
| year: | 1993 |
| 1 author: | |
| abstract: | The plane-wave transformer (PWT) linac, proposed by Swenson, will be used in the Saturnus, the UCLA high gain infrared FEL project. The FEL's output wavelength is designed to match the 10.6 um radiation which CO2 lasers produce.... |
| keywords: | |
| Details | edit | delete | |
| title: | Memo: Tentative Design of the Waveguide FEL at UCLA |
| format: | preprint |
| year: | 1993 |
| 1 author: | |
| abstract: | In order to investigate the slippage effects in FELs, we are going to design a millimeter FEL with the following parameters: .... |
| keywords: | |
| Details | edit | delete | |
| title: | BPM Revisit: Summary of the Previous Test Results |
| format: | preprint |
| year: | 1993 |
| 5 authors: | | | | | |
| abstract: | |
| keywords: | |
| Details | edit | delete | |
| title: | Two-Stage Chirped-Beam SASE-FEL for High Power Femtosecond X-Ray Pulse Generation |
| format: | preprint |
| year: | December 10, 2001 |
| 5 authors: | | | | | |
| abstract: | |
| keywords: | |
| Download | View | Details | edit | delete | |
| title: | The UCLA high gain infrared FEL |
| format: | preprint |
| year: | 1994 |
| 0 authors: | unknown |
| abstract: | |
| keywords: | |
| Download | View | Details | edit | delete | |
| title: | MAFIA Studies of the Plane Wave Tranformer Linac |
| format: | preprint |
| year: | Januray 6, 1992 |
| 1 author: | |
| abstract: | In designing a high power rf-accelerator one needs to examine any filed disturbances created by asymmetries in teh structure. In the following we present a study of the disturbance of the modes using the three-dimensional frequency domain solver MAFIA[1]. We pay particular attention to perturbations in the accelerating mode and also to higher order modes which can be excited by the electron beam itself. These perturbations in the accelerating mode and off axis kicks due to the higher order modes give rise to emittance growth. Some ideas of how to redesign the support structure in order to iminimze accelerating mode perturbation effects and also of how to damp out unwanted higher order modes are discussed. |
| keywords: | |
| Details | edit | delete | |
| title: | Surface Plasmon Enhanced Photoemission |
| format: | preprint |
| year: | March 18, 1993 |
| 1 author: | |
| abstract: | Photoemission studies have been carried out recently at the UCLA photo injector which cannot be explained by a straight forward application of the standard Fowler-Dubridge (1,2) theory for photoemission. This theory is used to calculate the contributions to the extracted current from field emission, thermal emission and the bulk photoemission process. The Fowler-Dubridge theory predicts a photoyield of 5x10(-6), which is two orders of magnitude less than that observed experimentally at 70 degrees incidence. However, if one assumes optical coupling to surface polasmons via surface roughness. Then one can calculate photoyields of 10(-4) as observed experimentally. Also, if the vector nature of the photoemission process is accounted for then one can calculated photoyields which agree with experimental data as a function of incident illumination angle, polarization angle, and laser wavelength. A few ideas are then set forth on photocathode preparation and materials so as to increase photoyield. |
| keywords: | |
| Details | edit | delete | |
| title: | Space Charge Depleted Emission from a Damaged Photocathode |
| format: | preprint |
| year: | February 4, 1993 |
| 2 authors: | | |
| abstract: | There has been a long-standing question about the amount of charge extracted from the UCLA photo-injector as a function of incident laser energy (quantum efficiency). One expects the charge measured at the exit of the rf gun to be a linear function of applied laser energy to the photocathode. However, this is not the case fo the UCLA experiment thus far. However, the quantum efficiency data which measures the total extracted charge out of the rf gun as a function of laser energy, is very non linear. From zero nC to approximately 0.5nC the charge extracted follows a linar trend. From 0.5nC to 3nC the extracted charge falls off unexpectedly. Because of the highly dynamical behaviour of the electron beam near the cathode, a series of PARMELA simulations have been carried out to model the evolution of the beam in this region. These simulations give excellent agreement with the experimental data. Also, a simple model is put forth to explain the physical process which limits the emission of charge. |
| keywords: | |
| Details | edit | delete | |
| title: | Space Charge Depleted Emission and Electron Beam Pulse Lengthening from a Damaged Photocathode |
| format: | preprint |
| year: | February 4, 1993 |
| 2 authors: | | |
| abstract: | There have been a long-standing questions about the amount of charge extracted from the UCLA photo-injector as a function of incident laser energy (quantum efficiency), and the observed pulse lengthening in time. One expects the charge measured at the exit of the rf gun to be a linear function of applied laser energy to the photocathode. However, this is not the case for the UCLA experiment thus far. The quantum efficiencey data, which measures the total extracted charge out of the rf gun as a function of laser energy, is very non linear. From zero nC to approximately 0.5 nC the charge extracted follows a linear trend. From 0.5 nC to 3 nC the extracted charge falls off unexpectedly. In addition, streak camera measurements indicate that the beam's temporal length expands considerably from that of the laser. Because of the highly dynamical behavior of the electron beam near the cathode, a series of PARMELA simulations have been carried out to model the evolution of the beam in this region, both in time structure and in maximum allowed charge. These simulations give excellent agreement with the experimental data. Also, a simple model is put forth to explain the physical process which limits the emission of charge. |
| keywords: | |
| Details | edit | delete | |
| title: | Space Charge Depleted Emission II: Further Exploration of the Model, and Comparison to Experiment |
| format: | preprint |
| year: | April 1, 1993 |
| 2 authors: | | |
| abstract: | In a previous note (CAA-TEC-NOTE-48), we presented theory and simulation of space charge suppression of the emitted beam charge in from gun. The simple theory, based on calculation of the longitudiinal electric field of the beam and its image charge at teh cathode, explained both the data and the simulation well. The saturation phenomenon of the emitted beam chartge was found to depend only on the applied electric field and the effective emission area of the photoelectrons. The purpose of this note is to further explore the applicability of this theoretical model, and to show that the 70 degree quantum efficiency data quantitatively support the model. |
| keywords: | |
| Details | edit | delete | |
| title: | Effects of the Stray Magnetic Field Caused by a Vacuum Ion Pump on the Accelerator Beamline |
| format: | preprint |
| year: | February 2, 1994 |
| 1 author: | |
| abstract: | A Vac Ion pump is often used adjacent to the accelerator beamline. Stray magnetic fields are caused by the pump's permanent magnet. The pump is attached to the beamline in one of two configurations, either parallel or perpendicular to the beam path. Moving charged particles, along the beamline, experience a force or kick due to the stray B-field which de3flects the particles away from their original trajectory. From measurements made in each configuration, the deflection angles of the particles were calculated. For a particle of low energy, 4.5 MeV, the angles calculated were approximately 1 and 12 mrad for Config. 1 and Config. 2 respectively. The calculations for high energy, 20 MeV, yielded angles of 1/5 and 3 mrad. These deflections, for Config. 1, are lower than the inherent divergence of the beam, so this configuration can be used without compromising the beam quality. The deflection due to Config. 2, at low energy, is larger than the inherent beam divergence and at high energy, it is over half of the beam divergence angle. the second configuration should not be used. |
| keywords: | |
| Details | edit | delete | |
| title: | Report on a Visit by American Scientists to UNK Project at IHEP-Protvino |
| format: | preprint |
| year: | January 8, 1993 |
| 6 authors: | | | | | | |
| abstract: | This document results from a visit to the Institute for High Energy Physics in Protvino, Russia, by a group of U.S. physicists during 13-15 July, 1992. The purpose of the trip, which was supported by the U.S. National Science Foundation, was to learn about the state of the UNK superconducting 3 TeV accelerator complex and also to understand the cost and magnitude of the task required to complete the machine. If completed, UNK could provide a unique High Energy Physics facility. First, a collider version could serve as an excellent Factory to study the decay of Beauty particles. Secondly, the 3 TeV proton beam may be the highest energy available for a fixed target physics program. Although the superconducting magnet design is mature and tests have been successful, severe budget cutbacks have brought the project to a virtual halt. A realistic goal for IHEP may be the expeditious completion of UNK-1, the 600 GeV booster ring, in parallel with the pursuit of international collaboration on fiscal, technical and management support for the 3 TeV project. |
| keywords: | |
| Details | edit | delete | |
| title: | Gain Computation |
| format: | preprint |
| year: | April 24, 2002 |
| 1 author: | |
| abstract: | |
| keywords: | |
| Download | View | Details | edit | delete | |
| title: | SUPERFLIC - A Recirculating Superconducting Linear Collider Top Factory |
| format: | preprint |
| year: | May 28, 1991 |
| 1 author: | |
| abstract: | |
| keywords: | |
| Details | edit | delete | |
| title: | Analogies Between Charged Particle Beams and Photon Beams: Simple Methods for Laboratory Use |
| format: | preprint |
| year: | October 25, 1991 |
| 1 author: | |
| abstract: | |
| keywords: | |
| Details | edit | delete | |
| title: | LASER-POWERED DIELECTRIC STRUCTURE AS A MICRON-SCALE ELECTRON SOURCE |
| format: | preprint |
| year: | |
| 3 authors: | | | |
| abstract: | We describe a resonant laser-powered structure, measur- ing 1 mm or less in every dimension, that is capable of generating and accelerating electron beams to low ener- gies ( 1–2 MeV). Like several other recently investigated dielectric-based accelerators, the device is planar and res- onantly excited with a side-coupled laser; however, exten- sive modifications are necessary for synchronous accelera- tion and focusing of nonrelativistic particles. Electrons are generated within the device via a novel ferroelectric-based cathode. The accelerator is constructed from dielectric ma- terial using conventional microfabrication techniques and powered by a 1- m gigawatt laser. The electron beams pro- duced are suitable for a number of existing industrial and medical applications. |
| keywords: | |
| Download | View | Details | edit | delete | |
| title: | DIELECTRIC WAKEFIELD ACCELERATOR EXPERIMENTS AT THE SABER FACILITY |
| format: | preprint |
| year: | |
| 17 authors: | | | | | | | | | | | | | | | | | |
| abstract: | Electron bunches with the unparalleled combination of high charge, low emittances, and short time duration, as first produced at the SLAC Final Focus Test Beam (FFTB), are foreseen to be produced at the SABER facility. These types of bunches have enabled wakefield driven accelerating schemes of multi-GV/m in plasmas. In the context of the Dielectric Wakefield Accelerators (DWA) such beams, having rms bunch length as short as 20 um, have been used to drive 100 um and 200 um ID hollow tubes above 20 GV/m surface fields. These FFTB tests enabled the measurement of a breakdown threshold in fused silica (with full data analysis still ongoing) [1]. With the construction and commissioning of the SABER facility at SLAC, new experiments would be made possible to test further aspects of DWAs including materials, tube geometrical variations, direct measurements of the Cerenkov fields, and proof of acceleration in tubes >10 cm in length. This collaboration will investigate breakdown thresholds and accelerating fields in new materials including CVD diamond. Here we describe the experimental plans, beam parameters, simulations, and progress to date as well as future prospects for machines based of DWA structures. |
| keywords: | pac 2007 |
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| title: | Beam-Driven Dielectric Wakefield Accelerating Structure as a THz Radiation Source |
| format: | preprint |
| year: | 2007 |
| 9 authors: | | | | | | | | | |
| abstract: | Experimental work is planned to study the performance of a beam-driven cylindrical dielectric wakefield accelerating structure as a source of THz coherent Cerenkov radiation (CCR). For an appropriate choice of dielectric tube geometry and driving electron bunch parameters, the device operates in a single-mode regime, producing radiation in the THz range. This source can potentially produce high power levels relative to currently available sources, with ~50 uJ radiated energy per pulse achievable using the electron beam currently in operation at the Neptune advanced accelerator laboratory at UCLA (~13 MeV beam energy, ~200 um RMS bunch length, ~500 pC bunch charge). Preparations underway for installation of the experiment are discussed. |
| keywords: | pbpl |
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