First Name: J.
Middle Name: T.
Last Name: Moody
Full Name: J.T. Moody
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4 papers
| title: | Novel Radio-Frequency Gun Structures For Ultrafast Relativistic Electron Diffraction |
| format: | journal article |
| year: | 2009 |
| 7 authors: | | | | | | | |
| abstract: | Radio-frequency (RF) photoinjector-based relativistic ultrafast electron diffraction (UED) is a promising new technique that has the potential to probe structural changes at the atomic scale with sub-100 fs temporal resolution in a single shot. We analyze the limitations on the temporal and spatial resolution of this technique considering the operating parameters of a standard 1.6 cell RF gun (which is the RF photoinjector used for the first experimental tests of relativistic UED at Stanford Linear Accelerator Center; University of California, Los Angeles; Brookhaven National Laboratory), and study the possibility of employing novel RF structures to circumvent some of these limits. |
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| title: | Experimental Generation and Characterization of Uniformly Filled Ellipsoidal Electron-Beam Distributions |
| format: | journal article |
| year: | 2008 |
| 5 authors: | | | | | |
| abstract: | For 40 years, uniformly filled ellipsoidal beam distributions have been studied theoretically, as they hold the promise of generating self-fields linear in the coordinate offset in all three directions. Recently, a scheme for producing such distributions, based on the strong longitudinal expansion of an initially very short beam under its own space-charge forces, has been proposed. In this Letter we present the experimental demonstration of this scheme, obtained by illuminating the cathode in a rf photogun with an ultrashort laser pulse ( |
| keywords: | pbpl prl |
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| title: | Electron Emission Characterization of Mg Photocathode Grown by Pulsed Laser Deposition Within an S-band RF Gun |
| format: | journal article |
| year: | 2009 |
| 7 authors: | | | | | | | |
| abstract: | Pulsed laser deposition (PLD) has been proposed several years ago as a suitable technique to deposit a pure Mg film over a radio frequency (rf ) gun Cu backflange in order to obtain a high efficiency photocathode surface for the generation of high brightness electron beams. In this paper we report preliminary experimental results on the emission properties of a PLD grown Mg film within the high electric field gradients of a rf gun showing the effects of the rf conditioning process on the cathode surface. Even though a laser cleaning process should be performed on the sample surface in order to remove contaminated layers, the results presented here are very promising for the realization of a final Mg-based photocathode. |
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| title: | Experimental Generation and Characterization of Uniformly Filled Ellipsoidal Beam Distribution |
| format: | conference procceeding |
| conference: | EPAC 2008 |
| year: | 2008 |
| 6 authors: | | | | | | |
| abstract: | Recently, a scheme for producing ideal uniformly filled ellipsoidal beam distributions, which depends on the strong longitudinal expansion of an initially very short beam under its own space charge forces, has been demonstrated at the UCLA Pegasus Laboratory. Here we present further work on the characterization of this novel regime of operation of a photoinjector. In particular we study the sensitivity of the generation of the uniformly filled ellipsoidal distribution from the initial transverse laser profile. The ultra-high brightness of the beam created operating in this ‘blow-out’ regime is verified obtaining high quality relativistic electron diffraction patterns from thin Al foils. |
| keywords: | pbpl_pub |
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