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Time Resolved Emittance Characterization Of An Induction Linac Beam Using Optical Transition Radiation
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Book Synopsis Time-Resolved Emittance Characterization of an Induction Linac Beam Using Optical Transition Radiation by :
Download or read book Time-Resolved Emittance Characterization of an Induction Linac Beam Using Optical Transition Radiation written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: An induction linac is used by Lawrence Livermore National Laboratory to perform radiographic testing at the Flash X-ray Radiography facility. Emittance characterization is important since x-ray spot size impacts the resolution of shadow-graphs. Due to the long pulse length, high current, and beam energy, emittance measurement using Optical Transition Radiation is an attractive alternative for reasons that will be described in the text. The utility of OTR-based emittance measurement has been well demonstrated for both RF and induction linacs. We describe the time-resolved emittance characterization of an induction linac electron beam. We have refined the optical collection system for the induction linac application, and have demonstrated a new technique for probing the divergence of a subset of the beam profile. The experimental apparatus, data reduction, and conclusions will be presented. Additionally, a new scheme for characterizing the correlation between beam divergence and spatial coordinates within the beam profile will be described.
Book Synopsis FXR LIA Optimization - Time-resolved OTR Emittance Measurement by : M. Ong
Download or read book FXR LIA Optimization - Time-resolved OTR Emittance Measurement written by M. Ong and published by . This book was released on 2005 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Flash X-Ray Radiography (FXR) facility at Lawrence Livermore National Laboratory utilizes a high current, long pulse linear induction accelerator to produce high doses of x-ray radiation. Accurate characterization of the transverse beam emittance is required in order to facilitate accelerator modeling and tuning efforts and, ultimately, to optimize the final focus spot size, yielding higher resolution radiographs. In addition to conventional magnet scan, pepper-pot, and multiple screen techniques, optical transition radiation (OTR) has been proven as a useful emittance measurement diagnostic and is particularly well suited to the FXR accelerator. We shall discuss the time-resolved emittance characterization of an induction linac electron beam using OTR, and we will present our experimental apparatus and analysis software. We shall also develop the theoretical background of beam emittance and transition radiation.
Book Synopsis Tuning the Magnetic Transport of an Induction LINAC Using Emittance by : C. G. Brown
Download or read book Tuning the Magnetic Transport of an Induction LINAC Using Emittance written by C. G. Brown and published by . This book was released on 2006 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Lawrence Livermore National Laboratory Flash X-Ray (FXR) machine is a linear induction accelerator used to produce a nominal 18 MeV, 3 kA, 65 ns pulse width electron beam for hydrodynamic radiographs. A common figure of merit for this type of radiographic machine is the x-ray dose divided by the spot area on the bremsstrahlung converter where a higher FOM is desired. Several characteristics of the beam affect the minimum attainable x-ray spot size. The most significant are emittance (chaotic transverse energy), chromatic aberration (energy variation), and beam motion (transverse instabilities and corkscrew motion). FXR is in the midst of a multi-year optimization project to reduce the spot size. This paper describes the effort to reduce beam emittance by adjusting the fields of the transport solenoids and position of the cathode. If the magnetic transport is not correct, the beam will be mismatched and undergo envelope oscillations increasing the emittance. We measure the divergence and radius of the beam in a drift section after the accelerator by imaging the optical transition radiation (OTR) and beam envelope on a foil. These measurements are used to determine an emittance. Relative changes in the emittance can be quickly estimated from the foil measurements allowing for an efficient, real-time study. Once an optimized transport field is determined, the final focus can be adjusted and the new x-ray spot measured. A description of the diagnostics and analysis is presented.
Book Synopsis Characterization of the 50 MeV ALS Linac Beam with Optical Transition Radiation by :
Download or read book Characterization of the 50 MeV ALS Linac Beam with Optical Transition Radiation written by and published by . This book was released on 1994 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: First experimental results of the optical transition radiation diagnostic at the Beam Test Facility (BTF) are presented. The BTF uses the 50 MeV Advanced Light Source (ALS) injector. Using sensitive CCD cameras single shot energies, spot sizes and divergences can be measured for the lnC/bunch electron beam. The emittance was determined by analyzing optical transition radiation data for various currents of a quadrupole lens.
Book Synopsis Observation and Analysis of Optical Transitions Radiation at the NPS Linac and Its Use for Diagnostics of Electron Beams by : David M. Caldwell
Download or read book Observation and Analysis of Optical Transitions Radiation at the NPS Linac and Its Use for Diagnostics of Electron Beams written by David M. Caldwell and published by . This book was released on 1990 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental technique for observing Optical Transition Radiation, (OTR), that is both simple and effective, is shown. A Macintosh II computer equipped with an image frame grabber board and Image software package allows for extensive analysis of the captured electron beam spot OTR patterns. The equipment is capable of measuring relative intensities to better than 1% for a constant source image. With beam energies of nearly 100 MeV the captured OTR images show an unexpected asymmetry in the beam intensity profile. The variations of the beam intensity and shape are shown for nominally steady beam conditions. Using Image, integrated signals of the beam spot OTR patterns for several targets as a function of beam current show a linear relationship, thereby creating a technique for computing electron beam current. Portions of the beam profile with varying percentages of beam spot maximum intensity also show a linear relationship between beam current and OTR image intensity. A radiation cone OTR pattern has been observed for the NPS linac beam. From the pattern, the Lorentz factor for the 100 MeV electrons is observed to be less than the computed value, and probably indicates the non-collinearity of the electron beam.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Time-resolved Imaging for the APS Linac Beams by :
Download or read book Time-resolved Imaging for the APS Linac Beams written by and published by . This book was released on 1998 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1967 with total page 1030 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Book Synopsis High-brightness Beam Diagnostics for the APS Linac by :
Download or read book High-brightness Beam Diagnostics for the APS Linac written by and published by . This book was released on 1999 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Advanced Photon Source (APS) injector includes an S-band linac with the capability to accelerate beams to 650 MeV. The linac has recently been upgraded with the installation of an rf thermionic gun in addition to the standard DC thermionic gun. The rf gun is predicted to have lower emittance (5[pi]mm mrad) and may be used to support the APS self-amplified spontaneous emission (SASE) experiments. The critical characterization of this gun's beam has begun with a beam diagnostics station at the end of the linac that can address beam transverse size, emittance, and bunch length (peak current). This station uses both an optical transition radiation (OTR) screen at 45° to the beam direction and a Ce-doped YAG single crystal normal to the beam with a 45° mirror behind it. The visible light images are detected by a Vicon CCD camera and a Hamamatsu C5680 synchroscan streak camera. Spatial resolution of about 30 [mu]m ([sigma]) and temporal resolution of 1 ps ([sigma]) have been demonstrated. Examples of rf gun beam characterization at 220 MeV are reported.
Book Synopsis Linac-beam Characterizations at 600 MeV Using Optical Transition Radiation Diagnostics by :
Download or read book Linac-beam Characterizations at 600 MeV Using Optical Transition Radiation Diagnostics written by and published by . This book was released on 1998 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Download or read book Digest of Technical Papers written by and published by . This book was released on 2001 with total page 954 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government reports annual index by :
Download or read book Government reports annual index written by and published by . This book was released on 199? with total page 1026 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Science Abstracts written by and published by . This book was released on 1995 with total page 1874 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Energy: a Continuing Bibliography with Indexes by :
Download or read book Energy: a Continuing Bibliography with Indexes written by and published by . This book was released on 1983 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt:
