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20 tech notes:

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title: New Features in UCLA-PARMELA v 2.1
format: tech note
year: 2005
1 author: R. J. England
abstract: This document describes modifications to the UCLA-PARMELA source code version 2.0. The modifications were made by R. J. England during the period from 2003 to 2005. The changes to the code consist of: (1) the implementation of the "SEXT" card for sextupoles, and (2) changes to the "TRWAVE" card which permit the fields to be printed out to a data file. These changes are detailed in the following subsections. In addition, (3) I document the input structure for the CELL card in versions 2.0 and 2.1 since this was found to differ from the description given in the UCLA-PARMELA manual. The modified code version number has been increased to v 2.1.
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title: New Vacuum Chamber for the Plasma Density Transition-Trapping Experiment
format: tech note
year: 2003
2 authors: M. Schneider | M.C. Thompson
abstract: The plasma density transition trapping experiment is designed to capture an electron beam and modify its quality (emittance, energy spread, and brightness) via a plasma wake-field [1]. The Particle Beam Physics Laboratory (PBPL) transition-trapping plasma experiment requires a chamber to support the confined plasma source, in-vacuum diagnostics and associated hardware. Initial measurements on the plasma source utilized a chamber initially created for an underdense plasma lens experiment [2]. However, current research and future positioning of the plasma source required drastic improvements of nearly all facets of the chamber design. The initial plan was to rearrange the plasma source to move the interaction box onto the opposite side of the pumping-Tee (see picture below). This proved successful to measure plasma densities at or above the required value to carry out the plasma transition-trapping experiment. However, because the original design of the interaction box did not have an exit port for the beamline, a new box design became necessary. A decision was made to redesign the plasma chamber from scratch. The proposed design and specifications are described in this note.
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title: PEGASUS Safety Interlock System
format: tech note
year: 2002
1 author: Gerard Andonian
abstract: Describes the design and functioning of the safety interlock system in the PEGASUS lab.
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title: Optical Transition Radiation Detector Work
format: tech note
year: 1992
0 authors: unknown
abstract: In our ongoing effort to develop beam diagnostics, we have agreed that OTR holds great promise. Development and understanding of this technology is useful for general beam measurements and will continue to be important when experiments such as the FEL are inserted. In light of this, I thought it would be appropriate to suggest a course of development for our OTR diagnostic.
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title: Optical Transition Radiation
format: tech note
year: 1992
1 author: G. Travish
abstract: The use of Optical Transition Radiation (OTR) as an on-line diagnostic system for the UCLA Particle Beam Physics Lab electron beam has been investigated. Beam divergence, energy and profile are some of the properties which have been theoretically and experimentally (past works) shown to be analyzable and measurable from OTR patterns. Calculations regarding the survivability of both the beam and the OTR target are made for various beam energies and target materials. It is found that a 20MeV beam passign through a thin aluminium target will be unperturbed, in terms of energy and angular divergence, and the target will not be destroyed. Finally, the use of an OTR double-foil interferometer, as a more precise diagnostic tool, is presented for future consideration.
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title: Considerations for Conical Horn Antenna Design optimizing Cerenkov radiation from hollow cylindrical dielectric tube
format: tech note
year: 2004
1 author: H. Badakov
abstract:
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title: Multibunch Operation of the 1GeV Machine
format: tech note
year: 1988
3 authors: A. Sessler | G. Travish | S. Yu
abstract:
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title: CAMAC Hardware Selection for SATURNUS
format: tech note
year: 1991
0 authors: unknown
abstract:
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title: Field Measurements of the Steering Magnets
format: tech note
year: 1993
1 author: Caulfield, J. M.
abstract: On Axis field measurements were made for the steering magnets with the current ranging from -1- to +10 Amps. The filed produced is linear with current. Some hysteresis is present. The first and second field integrals are also linear with current (as expected) and also show some hysteresis. The field produced ranges from about +/- 130 Gauss for +/- 10 Am,p with an effective field length of 9.75cm.
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title: Solenoid Field Measurements
format: tech note
year: April 1, 1991
1 author: S. Hartman
abstract:
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title: Remote Control of the Miller Power Supply
format: tech note
year: January 1, 1994
1 author: Hedrick, R.
abstract: The current for the rolenoids is provided by a Miller Synchrowave 500 Arc Welding Power Supply (MPS).....
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title: Faraday Cup Beam Dumps for the UCLA PBPL
format: tech note
year: May 16, 1994
1 author: McIntosh, D. H.
abstract: Two identical Faraday cups have been designed and built to stop a 20 meV, 1 nC electron pulse beam, accelerated at the UCLA Particle Beam Physics Laboratory (PBPL). The dumps were also designed to serve as charge measuring diagnostics. Each device is a simple design using a carbon graphite core, Delrin insulation, vacuum tubing components, and lead brick shielding. The graphite core stops the beam while producing manageable secondary radiation sources. The overall design considerations and final solutions are summarized.
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title: The Beam Break-Up Numerical Simulator
format: tech note
year: 1990
1 author: G. Travish
abstract: Beam Break-Up (BBU) is a severe constraint in accelerator design, limiting beam current and quality. The control of BBU has become the focus of much research in the design of the next generation collider, recirculating and linear induction accelerators and advanced accelerators. Determining the effect on BBU of modifications to cavities, the focusing elements or the beam is frequently beyond the ability of current analytic models. A computer code was written to address this problem. The Beam Break-Up Numerical Simulator (BBUNS) was designed to numerically solve for beam break-up (BBU) due to an arbitrary transverse wakefield. BBUNS was developed to be as user friendly as possible on the Cray computer series. The user is able to control all aspects of input and output by using a single command file. In addition, the wakefield is specified by the user and read in as a table. The program can model energy variations along and within the beam, focusing magnetic field profiles can be specified, and the graphical output can be tailored. In this note we discuss BBUNS, its structure and application. Included are detailed instructions, examples and a sample session of BBUNS. This program is available for distribution.
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title: Optical Transition Radiation
format: tech note
year: 1992
1 author: Beth Gitter
abstract: The use of Optical Transition Radiation (OTR) as an on-line diagnostic system for the UCLA Particle Beam Physics Lab electron beam has been investigated. Beam divergence, energy and profile are some of the properties which have been theoretically and experimentally (past works) shown to be analyzable and measurable from OTR patterns. Calculations regarding the survivability of both the beam and the OTR target are made for various beam energies and target materials. It is found that a 20 MeV beam passing through a thin aluminum target will be unperturbed, in terms of energy and angular divergence, and the target will not be destroyed. Finally, the use of an OTR double-foil interferometer, as a more precise diagnostic tool, is presented for future consideration.
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title: Operating Procedure for Saturnus Modulator
format: tech note
year: 1990
2 authors: Terrien, C. | S. Park
abstract:
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title: Beam Break-Up in a KEK TBA
format: tech note
year: 1989
2 authors: D. Whittum | G. Travish
abstract:
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title: Procedure for the production of a 10 micron aluminum foil OTR window
format: tech note
year: 2004
1 author: M.C. Thompson
abstract:
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title: UCLA PBPL Safety Interlock System Description and Operation Manual
format: tech note
year: 1996
0 authors: unknown
abstract:
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title: UCLA Neptune CTR Interferometer
format: tech note
year: 2005
1 author: R. J. England
abstract: The purpose of this document is to outline the basic operating theory behind the coherent transition radiation (CTR) interferometry technique employed at the UCLA Neptune Laboratory for diagnosing the bunch length of the electron beam produced by the Neptune 1.6-cell gun and PWT accelerating structure. General theoretical results are presented and then applied specifically to the Neptune interferometer developed by Uwe Happek, which we refer to henceforth as the Uwefarometer. Particular attention is paid to understanding the theory of the wire-grid polarizers which are used in the Uwefarometer to split and recombine the terahertz CTR radiation.
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title: Neptune Second Harmonic Generation Autocorrelator
format: tech note
year: 2005
1 author: R. J. England
abstract: This document provides detailed information on the basic theoretical knowledge required to understand the operational principles of the Second Harmonic Generation Autocorrelator used for measuring the pulse length of the infrared drive laser at the Neptune Laboratory. This autocorrelator was originally assembled by Kari Sanders and Sergei Tochitsky ca. 2000-2001. Some information about its operation may be found in Kari Sanders' master's thesis. In short, the autocorrelator operates by splitting the infrared (1064nm) pulse produced by the Neptune regenerative amplifier and grating compressor and then crossing the two split pulses inside of a nonlinear KDP crystal, via a Type I "ooe" interaction, to produce noncollinear second harmonic frequency upconversion to green (532 nm). The intensity of the green as a function of the delay between the two split pulses produces the autocorrelation of the pulse, which can be used to extract the pulse length and (to some extent) the time structure of the pulse. The theory of autocorrelation will not be discussed in this document.
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