| Paper |
Title |
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| TUPMS069 |
Proposed Tabletop Laser-driven Coherent X-Ray Source
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1332 |
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- T. Plettner, R. L. Byer
Stanford University, Stanford, Califormia
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Laser-driven particle acceleration shows promise for compact ultra-low emittance, GeV/m electron sources. The first proof-of-principle demonstration for this particle acceleration technique has been carried out and a comprehensive experimental program to develop dielectric based micro-accelerator structures is under way. Therefore it is natural to explore the possibility for applying these future accelerators for SASE-FEL based X-ray generation. We employ well-established numerical models based on the standard SASE-FEL theory to find a plausible set of undulator and electron beam parameters to accomplish the desired X-ray pulse structure.
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| WEXKI02 |
Demonstration of Optical Microbunching and Net Acceleration at 0.8 microns
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1894 |
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- C. M.S. Sears, E. R. Colby, R. Ischebeck, C. Mcguinness, R. Siemann, J. E. Spencer, D. R. Walz
SLAC, Menlo Park, California
- R. L. Byer, T. Plettner
Stanford University, Stanford, Califormia
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Formation, diagnosis, and acceleration of electron microbunches from an rf linac generated beam is presented. A PM-EM hybrid IFEL/chicane buncher was designed and commissioned to produce optical bunch trains suitable for injection into solid-state laser accelerators. Microbunching is independently diagnosed via coherent optical tranisition radiation (COTR). Net acceleration is obtained by splitting the laser power between the IFEL and an inverse transition radiation (ITR) accelerator.
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Slides
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| THPMS052 |
Optical Wakefield from a Photonic Bandgap Fiber Accelerator
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3106 |
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- C. M.S. Sears, E. R. Colby, B. M. Cowan, R. Ischebeck, C. Mcguinness, R. J. Noble, R. Siemann, J. E. Spencer, D. R. Walz
SLAC, Menlo Park, California
- R. L. Byer, T. Plettner
Stanford University, Stanford, Califormia
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Photonic Bandgap (PBG) structures have recently been proposed as optical accelerators for there high coupling impedance and high damage threshold (>2 GV/m). As a first step in preparing a PBG accelerator, we propose to first observe the optical wakefield induced incoherently by an electron beam traversing the structure in the absence of a coupled laser pulse. The electrons are coupled into the fiber via a permanent magnet quadrupole triplet. The electrons excite fiber modes with speed-of-light phase velocities. By observing the wakefield using a spectrometer, the accelerating mode frequencies are determined.
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| THPMS080 |
Inverse-Transition Radiation Laser Acceleration Experiments at SLAC
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3172 |
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- T. Plettner, R. L. Byer
Stanford University, Stanford, Califormia
- E. R. Colby, R. Ischebeck, C. Mcguinness, R. J. Noble, C. M.S. Sears, R. Siemann, J. E. Spencer, D. R. Walz
SLAC, Menlo Park, California
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We present a series of laser-driven particle acceleration experiments that are aimed at studying laser-particle acceleration as an inverse-radiation process. To this end we employ a semi-open vacuum setup with a thin planar boundary that interacts with the laser and the electromagnetic field of the electron beam. Particle acceleration from different types of boundaries will be studied and compared to the theoretical expectations from the Inverse-radiation picture and the field path integral method. We plan to measure the particle acceleration effect from transparent, reflective, black, and rough surface boundaries. While the agreement between the two acceleration pictures is straightforward to prove analytically for the transparent and reflective boundaries the equivalence is not clear-cut for the absorbing and rough-surface boundaries. Therefore, experimental observation may be the most reliable method for establishing the appropriate model for the interaction of the laser field with the particle beam in the presence of a loaded vacuum structure.
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| THPMS081 |
Proposed Few-cycle Laser-particle Accelerator Structure
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3175 |
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- T. Plettner, R. L. Byer, P. P. Lu
Stanford University, Stanford, Califormia
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We describe a proposed transparent dielectric grating accelerator structure that is designed for ultra-short laser pulse operation. The structure is not a waveguide, but rather it is based on the principle of periodic field reversal to achieve phase synchronicity for relativistic particles. To preserve ultra-short pulse operation it does not resonate the laser field in the vacuum channel. The geometry of the structure appears well suited for application with high average power lasers and high thermal loading. It shows potential for an unloaded gradient of several GeV/m with 10 fsec laser pulses and the possibility to accelerate high bunch charges. The fabrication procedure and proposed near-term experiments with this accelerator structure are presented.
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| FRPMS072 |
Timing Stability and Control at the E163 Laser Acceleration Experiment
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4195 |
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- C. Mcguinness, E. R. Colby, R. Ischebeck, R. J. Noble, C. M.S. Sears, R. Siemann, J. E. Spencer, D. R. Walz
SLAC, Menlo Park, California
- R. L. Byer, T. Plettner
Stanford University, Stanford, Califormia
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Funding: DOE: DE-AC02-76SF00515 and DE-FG06-97ER41276
The laser acceleration experiments conducted for the E163 project at the NLC Test Accelerator facility at SLAC have stringent requirements on the temporal properties of the electron and laser beams. A system has been implemented to measure the relative phase stability between the RF sent to the gun, the RF sent to the accelerator, and the laser used to generate the electrons. This system shows rms timing stability better than 1 psec. Temporal synchronicity between the 0.5 psec electron bunch, and the 0.5 psec laser pulse is also of great importance. Cherenkov radiation is used to measure the arrival time of the electron bunch with respect to the laser pulse, and the path length of the laser transport is adjusted to optimize temporal overlap. A linear stage mounted onto a voice coil is used to make shot-by-shot fine timing adjustments to the laser path. The final verification of the desired time stability and control is demonstrated by observing the peak of the laser-electron interaction signal over the course of several minutes.
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