The Argonne Wakefield Accelerator high current photocathode gun and drive linac

Schoessow, P.; Chojnacki, E.; Cox, G.; Gai, W.; Ho, C. H.; Konecny, R.; Power, John; Rosing, M.; Simpson, J.; Barov, N.; Conde, Manoel

doi:10.1109/pac.1995.505100

Cited by 8 publications

(1 citation statement)

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“…This gun is then appropriately called the "witness gun". Figure 1 shows a schematic of the experimental setup [1]. The half-cell drive gun was designed to have a high accelerating field (92 MV/m at the photocathode surface) to allow the extraction of high charge bunches, and to produce a 2 MeV beam with the limited RF power available at the design time (1.5 MW at 1.3 GHz).…”

Section: Methodsmentioning

confidence: 99%

The Argonne Wakefield Accelerator: diagnostics and beam characterization

Conde

Gai²,

Konecny³

et al.

Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)

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The Argonne Wakefield Accelerator is comprised of two L-band photocathode RF guns and standing wave linac structures. The high charge bunches (20 -100 nC) produced by the main gun (drive gun) allow us to study the generation of wakefields in dielectric lined structures and plasmas. The secondary gun (witness gun) generates low charge bunches (80 -300 pC) that are used to probe the wakefields excited by the drive bunches. We use insertable phosphor screens for beam position monitoring. Beam intensity is measured with Faraday cups and integrating current transformers. Quartz or aerogel Cerenkov radiators are used in conjunction with a Hamamatsu streak-camera for bunch length measurements. The beam emittance is measured with a pepper-pot plate and also by quadrupole scan techniques. We present a description of the various diagnostics and the results of the measurements. These measurements are of particular interest for the high current (drive) linac, which operates in a much higher charge regime than other photoinjector-based linacs.

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Section: Methodsmentioning

confidence: 99%

The Argonne Wakefield Accelerator: diagnostics and beam characterization

Conde

Gai²,

Konecny³

et al.

Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)

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A high-charge and short-pulse RF photocathode gun for wake-field acceleration

Gai

Conde

et al. 1998

Nuclear Instruments and Methods in Physics Research Section A:

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THz-range cyclotron super-radiance from photoinjector-formed dense bunch of rotating electrons

Ginzburg,

Yurovskiy,

Zotova

et al. 2023

Physics of Plasmas

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We study the possibility of terahertz pulse generation based on cyclotron super-radiance (SR) of an extended (in the scale of the wavelength) bunch of rotating electrons, which moves in a cylindrical waveguide with a translational velocity close to the wave's group velocity. In the rest frame, this group synchronism regime corresponds to radiation of an unmoving bunch of excited cyclotron oscillators at a quasi-cutoff frequency of a waveguide mode. We develop the generalized self-consistent model of cyclotron SR in the group synchronism regime describing both the azimuthal self-bunching of rotating electrons and their longitudinal displacements under the action of Coulomb repulsive forces and recoil effects caused by high-frequency magnetic fields of the generated SR pulse. Within the framework of the developed analytical model and based on direct PIC simulations, we demonstrate the feasibility of generating picosecond SR pulses with a central frequency of 1 THz and a peak power of 90 MW by photoinjector-formed electron bunches guided in a strong magnetic field of 10.5 T. Simulations show that in the group synchronism regime, the SR pulse is less affected by longitudinal forces, as compared to the case of mismatched velocities. In addition, the Lorentz force can provide partial self-compression of the electron bunch with the formation of electron density filaments.

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The Argonne Wakefield Accelerator high current photocathode gun and drive linac

Cited by 8 publications

References 1 publication

The Argonne Wakefield Accelerator: diagnostics and beam characterization

The Argonne Wakefield Accelerator: diagnostics and beam characterization

A high-charge and short-pulse RF photocathode gun for wake-field acceleration

THz-range cyclotron super-radiance from photoinjector-formed dense bunch of rotating electrons

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