Applications of the General Particle Tracer code

Geer, S.B. van der; Loos, M. J. de

doi:10.1109/pac.1997.751279

Cited by 35 publications

(41 citation statements)

References 2 publications

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“…The cathode surface electric field as a function of coordinate s along the surface of the radial cross section of the cathode electrode is represented by E C ðsÞ, where s ¼ 0 mm corresponds to the photocathode center. The anode position that is impinged on by electrons or microparticles emitted from the cathode position s is calculated by the particle tracking code GPT [36], and the corresponding anode surface electric field is represented by E A ðsÞ. If a positive ion with zero energy is generated at the anode by a microdischarge, it is accelerated by E A ðsÞ back to the cathode position s þ Δs.…”

Section: B Difference Between 100-and 160-mm Gapsmentioning

confidence: 99%

Experimental investigation of an optimum configuration for a high-voltage photoemission gun for operation at≥500 kV

Nishimori

Nagai

Matsuba

et al. 2014

Phys. Rev. ST Accel. Beams

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We demonstrated the generation of a 500-keV electron beam from a high dc voltage photoemission gun for an energy recovery linac light source [N. Nishimori et al., Appl. Phys. Lett. 102, 234103 (2013)]. This demonstration was achieved by addressing two discharge problems that lead to vacuum breakdown in the dc gun. One is field emission generated from a central stem electrode. We employed a segmented insulator to protect the ceramic insulator surface from the field emission. The other is microdischarge at an anode electrode or a vacuum chamber, which is triggered by microparticle transfer or field emission from a cathode electrode. An experimental investigation revealed that a larger acceleration gap, optimized mainly to reduce the surface electric field of the anode electrode, suppresses the microdischarge events that accompany gas desorption. It was also found that nonevaporable getter pumps placed around the acceleration gap greatly help to suppress those microdischarge events. The applied voltage as a function of the total gas desorption is shown to be a good measure for finding the optimum dc gun configuration.

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Section: B Difference Between 100-and 160-mm Gapsmentioning

confidence: 99%

Experimental investigation of an optimum configuration for a high-voltage photoemission gun for operation at≥500 kV

Nishimori

Nagai

Matsuba

et al. 2014

Phys. Rev. ST Accel. Beams

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“…The shell approach has been compared to several other methods such as the direct integration of the coupled envelope equations [35,68,71], a modified Poisson solver and a 3-D point to point interaction code [72]. Each of these methods have their own set of approximations which we are going to review next.…”

Section: Derivation Of the Basic Equations For The Shell Approach 97mentioning

confidence: 99%

“…The electromagnetic fields generated by this method are calculated directly from relativistic particle-particle interaction, outlined in Ref. [72]. Radiation effects are not included and retardation effects are approximated.…”

Section: A 3-d Point To Point Interaction Approachmentioning

confidence: 99%

Controlled Electron Injection into Plasma Accelerators and SpaceCharge Estimates

Fubiani

2005

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Doctor Wim P. Leemans, ChairPlasma based accelerators are capable of producing electron sources which are ultra-compact (a few microns) and high energies (up to hundreds of MeVs) in much shorter distances than conventional accelerators. This is due to the large longitudinal electric field that can be excited without the limitation of breakdown as in RF structures. The characteristic scalelength of the accelerating field is the plasma wavelength and for typical densities ranging from 10 18 − 10 19 cm −3 , the accelerating fields and scalelength can hence be on the order of 10 − 100 GV/m and 10 − 40 µm, respectively.The production of quasi monoenergetic beams was recently obtained in a regime relying on self-trapping of background plasma electrons, using a single laser pulse for wakefield generation. In this dissertation, we study the controlled injection via the beating of two lasers (the pump laser pulse creating the plasma wave and a second beam being propagated in opposite direction) which induce a localized injection of background plasma electrons. The aim of this dissertation is to describe in detail the physics of optical injection using two lasers, the characteristics of the electron beams produced (the micrometer scale plasma wavelength can result in femtosecond and i ii Abstract even attosecond bunches) as well as a concise estimate of the effects of space charge on the dynamics of an ultra-dense electron bunch with a large energy spread. AcknowledgementsThere are many people that I wish to thank for valuable help they gave me during the course of my PhD. It was overall a great experience for me, I learned a lot in many areas and this work confirmed my deep passion for science in general.My great thanks to my adviser Wim Leemans. He gave me such a great opportunity by inviting me to come to l'OASIS group as a PhD student. He was always present for both the good and doubtful times when the results were not

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“…Additionally when designing a thermionic cathode system, estimation of the back-bombardment power is limited to the use of simulation tools such as PARMELA [14], GPT [15], or SPIFFE [16]. Modern computing capabilities have made this process fairly straightforward, however trade-off studies over a wide parameter space using only simulation is cumbersome.…”

Section: Introductionmentioning

confidence: 99%

Theory and simulation of backbombardment in single-cell thermionic-cathode electron guns

Edelen

Biedron

Harris

et al. 2015

Phys. Rev. ST Accel. Beams

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This paper presents a comparison between simulation results and a first principles analytical model of electron back-bombardment developed at Colorado State University for single-cell, thermionic-cathode rf guns. While most previous work on back-bombardment has been specific to particular accelerator systems, this work is generalized to a wide variety of guns within the applicable parameter space. The merits and limits of the analytic model will be discussed. This paper identifies the three fundamental parameters that drive the back-bombardment process, and demonstrates relative accuracy in calculating the predicted back-bombardment power of a single-cell thermionic gun.

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Applications of the General Particle Tracer code

Cited by 35 publications

References 2 publications

Experimental investigation of an optimum configuration for a high-voltage photoemission gun for operation at≥500 kV

Experimental investigation of an optimum configuration for a high-voltage photoemission gun for operation at≥500 kV

Controlled Electron Injection into Plasma Accelerators and SpaceCharge Estimates

Theory and simulation of backbombardment in single-cell thermionic-cathode electron guns

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