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EXACT SIMULATIONS OF THE TRAJECTORIES OF ELECTRONS
ACCELERATED FROM REST TO RELATIVISTIC VELOCITIES
BY RADIALLY POLARIZED OPTICAL PULSE:
PROGRAM AND RESULTS
by
Hyun Min Cho
A Dissertation Presented to the
FACULTY OF THE GRADUATE SCHOOL
UNIVERSITY OF SOUTHERN CALIFORNIA
In Partial Fulfillment of the
Requirements for the Degree
DOCTOR OF PHILOSOPHY
(ELECTRICAL ENGINEERING)
August 2008
Copyright 2008 Hyun Min Cho
Object Description
| Title | Exact simulations of the trajectories of electrons accelerated from rest to relativistic velocities by radially polarized optical pulse: program and results |
| Author | Cho, Hyun Min |
| Author email | hyuncho@usc.edu |
| Degree | Doctor of Philosophy |
| Document type | Dissertation |
| Degree program | Electrical Engineering |
| School | Viterbi School of Engineering |
| Date defended/completed | 2008-05-14 |
| Date submitted | 2008 |
| Restricted until | Unrestricted |
| Date published | 2008-07-30 |
| Advisor (committee chair) | Hellwarth, Robert W. |
| Advisor (committee member) |
Steier, William H. Bars, Itzhak |
| Abstract | A relativistic electron co-propagating with a slowly diverging focused 1-cycle, 1-Joule, 1-micron half-wave (111) radially- polarized optical pulse gains nearly 0.43 GeV energy while in a half focal region. In this thesis we describe a new computer program that extends this analytic result to compute the exact trajectory, and its consequences, of an electron initially at rest at any position near the focal region of the incident optical pulse. We have limited the "exact simulation" to try four families of pulse solutions (of Maxwell 's equations) which we have found to produce the highest final electron energy or highest amount of re-radiated light, varying the pulse parameters. The nature and statistics of the trajectories having different starting points show that (i) Nearly 100% of initially-at-rest non-interacting electrons struck in the focal volume of the (111) pulse mentioned above are accelerated to final energies between 0.10 and 0.27 GeV. (ii) The standard (111) pulse striking a large volume of initially-at-rest non-interacting electrons creates a cylindrical cavity completely empty of electrons. (iii) An electron struck by a standard (111) optical pulse radiates ~ 10 atto-joule, depending on its initial position in the focal region. (iv) We examined our simulation of radiated power from 2 electrons in the focal region and found the expected 4 factor from coherent scattering. We have extended our program to calculating the trajectory of initially-moving electrons. For 155 starting positions one micron apart on a line at 80 degrees to the axis of a standard (111) pulse, and having initial velocity 0.5c, the electron increase its energy by a average of 70 MeV. |
| Keyword | laser driven accelerator; light scattering simulation; focused doughnut-shaped optical pulse |
| Language | English |
| Part of collection | University of Southern California dissertations and theses |
| Publisher (of the original version) | University of Southern California |
| Place of publication (of the original version) | Los Angeles, California |
| Publisher (of the digital version) | University of Southern California. Libraries |
| Type | texts |
| Legacy record ID | usctheses-m1463 |
| Contributing entity | University of Southern California |
| Rights | Cho, Hyun Min |
| Repository name | Libraries, University of Southern California |
| Repository address | Los Angeles, California |
| Repository email | cisadmin@dots.usc.edu |
| Filename | etd-Cho-20080730 |
| Archival file | uscthesesreloadpub_Volume26/etd-Cho-20080730.pdf |
Description
| Title | Page 1 |
| Contributing entity | University of Southern California |
| Repository email | cisadmin@dots.usc.edu |
| Full text | EXACT SIMULATIONS OF THE TRAJECTORIES OF ELECTRONS ACCELERATED FROM REST TO RELATIVISTIC VELOCITIES BY RADIALLY POLARIZED OPTICAL PULSE: PROGRAM AND RESULTS by Hyun Min Cho A Dissertation Presented to the FACULTY OF THE GRADUATE SCHOOL UNIVERSITY OF SOUTHERN CALIFORNIA In Partial Fulfillment of the Requirements for the Degree DOCTOR OF PHILOSOPHY (ELECTRICAL ENGINEERING) August 2008 Copyright 2008 Hyun Min Cho |
