Abstract
We report experimental results on the high peak current electron beam generated at the Argonne Wakefield Accelerator facility for wakefield applications. The facility produces bunch charges in the range 15--100 nC by using a photocathode based RF electron gun. The energy of the beam is 14 MeV. Our measurements show that for bunches of 100 nC, the pulse length can be as short as 30 ps. A detailed systematic study of pulse length versus charge is reported, as well as comparisons with numerical simulations. Dark current beam loading in the high field RF gun is also discussed.
Highlights
Advanced particle acceleration methods have been a subject of intensive study in recent years, as evidenced by a series of workshops and conferences [1]
The plot shows the average value of charge and bunch length for seven bins, indicating that in this charge range the pulse length is almost constant, fluctuating between 15 and 20 ps
We have plotted FWHM of the bunch lengths and the 95% RMS values
Summary
Advanced particle acceleration methods have been a subject of intensive study in recent years, as evidenced by a series of workshops and conferences [1]. One of the prominent schemes is based on electron beam driven wakefields This method uses an intense short electron beam to excite wakefields in plasmas [2], in slow wave structures such as iris loaded metallic structures [3], or in dielectric loaded waveguides [4]. To achieve high gradient acceleration wakefields, electron bunches of 20–100 nC with pulse lengths of 5–30 ps FWHM are needed These types of electron sources have not been available until recently. FWHM of 15–40 ps, which have been used for initial wakefield experiments in both dielectric loaded structures [10] and plasmas [11] These unprecedented high-charge short-electron bunches, allied with the uniqueness of having two photocathode RF guns with adjustable delay between their beams, make AWA an ideal facility for the study of electron beam driven wakefield acceleration
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