First Name: P.
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Last Name: Tran
Full Name: P. Tran
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11 papers
| title: | Measurements of the tune variations induced by non-linearities in lepton machines |
| format: | conference procceeding |
| conference: | 1996 European Particle Accelerator Conference |
| year: | 1997 |
| 9 authors: | | | | | | | | | |
| abstract: | The precise measurement of the betatron tune as a function of the oscillation amplitude provides a useful information on non-linear beam dynamics. In lepton accelerators, this measurement is made difficult due to various damping mechanism. To counteract this, we propose to use algorithms that provide a precise measurement of the tune in a small number of turns. We apply these procedures in LEP at injection and collision energy, as well as in SPEAR at injection energy. Collections of experimental data, and a first comparison with the results of model-based simulations are discussed. (9 References). |
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| title: | Status of UCLA IR FEL |
| format: | preprint |
| year: | 1996 |
| 21 authors: | | | | | | | | | | | | | | | | | | | | | |
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| title: | Measurements of the octupole-induced amplitude-dependent frequency shift in SPEAR |
| format: | conference procceeding |
| conference: | 1995 Particle Accelerator Conference |
| year: | 1995 |
| 5 authors: | | | | | |
| abstract: | Four octupoles are used in SPEAR to provide the frequency spread for Landau damping of coupled-bunch motions at high current. With the planned implementation of a new low-emittance lattice, the effectiveness of the octupoles needs to be quantified. The recent development of a multi-dimensional turn-by-turn phase-space monitor and the availability of an accurate frequency analysis technique have made measurement of the octupole-induced amplitude-dependent frequency shift in the new SPEAR lattice possible. This paper presents the data collection and analysis procedures, and compares experimental results to model-based simulations. (5 References). |
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| title: | Nonlinear beam dynamics experimental program at SPEAR |
| format: | conference procceeding |
| conference: | Workshop on Nonlinear Dynamics in Particle Accelerators: Theory and Experiments |
| year: | 1995 |
| 5 authors: | | | | | |
| abstract: | Since nonlinear effects can impose strict performance limitations on modern colliders and storage rings, future performance improvements depend on further understanding of nonlinear beam dynamics. Experimental studies of nonlinear beam motion in three-dimensional space have begun in SPEAR using turn-by-turn transverse and longitudinal phase-space monitors. This paper presents preliminary results from an on-going experiment in SPEAR. (10 References). |
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| title: | Status of the variable momentum compaction storage ring experiment in SPEAR |
| format: | conference procceeding |
| conference: | 1993 Particle Accelerator Conference |
| year: | 1993 |
| 11 authors: | | | | | | | | | | | |
| abstract: | Variable momentum compaction lattices have been proposed for electron-positron colliders and synchrotron radiation sources to control synchrotron tune and bunch length. To address questions of single particle stability limits, a study has been initiated to change the SPEAR lattice into a variable momentum compaction configuration for experimental investigation of the beam dynamics. In this paper, we describe a model-based method used to transform SPEAR from the injection lattice to the low momentum compaction configuration. Experimental observations of the process are reviewed. (12 References). |
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| 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. |
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| title: | Photoelectron beams from the UCLA RF gun |
| format: | conference procceeding |
| conference: | 3rd Advanced Accelerator Concepts Workshop |
| year: | 1993 |
| 12 authors: | | | | | | | | | | | | |
| abstract: | A high brightness, low emittance photocathode rf gun is starting operation at UCLA as an injector to a 20 MeV linac. This linac will initially be used to drive FELs, plasma wakefield accelerators, and to test plasma lenses. The gun is a 1 1/2 cell pi-mode standing wave structure running at 2.856 GHz, and has a copper photocathode. In the initial commissioning of the gun, photoelectron beams of up to 2.5 nC at 4.5 MeV have been produced. We report on the current status of the system, experimental data taken with 50 ps UV laser pulses, and plans for the future. |
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| title: | The UCLA IR FEL project |
| format: | conference procceeding |
| conference: | 14th International Free Electron Laser Conference |
| year: | 1993 |
| 21 authors: | | | | | | | | | | | | | | | | | | | | | |
| abstract: | A 10.6 mu m free electron laser (FEL) operating in the high gain regime is under construction at UCLA. FEL physics significant to future short wavelength operation is emphasized including optical guiding, superradiance, saturation and self-amplified spontaneous emission (SASE). A 5 MeV RF photocathode gun illuminated by a UV laser supplies a high brightness electron beam which is injected into a plane wave transformer (PWT) linac for acceleration to 20 MeV. Recent measurements of the gun emittance as well as quantum efficiency are presented. The undulator is of a modified hybrid design producing approximately 7.5 kG peak field on axis with 5 mm gap spacing and 1.5 cm pole period. Simulation results which include three-dimensional effects are furnished. The present status and future plans of the project are summarized. (16 References). |
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| title: | Status of RF photoinjector and PWT linac at UCLA |
| format: | conference procceeding |
| conference: | 1992 Linear Accelerator Conference |
| year: | 1992 |
| 12 authors: | | | | | | | | | | | | |
| abstract: | The authors report the present status of RF photoinjector and plane wave transformer (PWT) linac for the production of 20 MeV/c electron beam. The photoinjector is a 1/sup 1///sub 2/ cell pi -mode standing wave structure operating at 2.856 GHz with photoelectrons generated on a copper cathode by 4 ps long laser pulse at 206 nm. Measurements of the beam of photoelectrons are underway at various experimental parameters. The PWT has been tested at low power to investigate its mode structure. An overview of the system, latest data, and future directions are presented. (5 References). |
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| 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. |
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| title: | SATURNUS Quadrupole Magnet Field Preliminary Measurements |
| format: | preprint |
| year: | 1992 |
| 2 authors: | | |
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