107 research outputs found
Plasma Lens Prototype Progress: Plasma Diagnostics And Particle Tracking For ILC e+ Source
In recent years, the concept of high-gradient, symmetric focusing using
active plasma lenses has regained notable attention owing to its potential
benefits in terms of compactness and beam dynamics when juxtaposed with
traditional focusing elements. An enticing application lies in the optical
matching of extensively divergent positrons originating from the
undulator-based ILC positron source, thereby enhancing the positron yield in
subsequent accelerating structures. Through a collaboration between the
University of Hamburg and DESY Hamburg, a scaled-down prototype for this
purpose has been conceptualized and fabricated. In this presentation, we
provide an overview of the ongoing progress in the development of this
prototype. Furthermore, first insights into the development of a particle
tracking code especially designed for plasma lenses with implemented Bayes
optimization, are given.Comment: TALK PRESENTED AT THE INTERNATIONAL WORKSHOP ON FUTURE LINEAR
COLLIDERS (LCWS2023), 15-19 MAY 2023. C23-05-15.3., LCWS23, SLAC, Plasma
lens, ILC, 3 page
Generation of quasi continuous-wave electron beams in an L-band normal conducting pulsed RF injector for laboratory astrophysics experiments
We report on an approach to produce quasi continuous-wave (cw) electron beams
with an average beam current of milliamperes and a mean beam energy of a few
MeV in a pulsed RF injector. Potential applications are in the planned
laboratory astrophysics programs at DESY. The beam generation is based on field
emission from a specially designed metallic field emitter. A quasi cw beam
profile is formed over subsequent RF cycles at the resonance frequency of the
gun cavity. This is realized by debunching in a cut disk structure accelerating
cavity (booster) downstream of the gun. The peak and average beam currents can
be tuned in beam dynamics simulations by adjusting operation conditions of the
booster cavity. Optimization of the transverse beam size at specific positions
(e.g., entrance of the plasma experiment) is performed by applying magnetic
focusing fields provided by solenoids along the beam line. In this paper, the
design of a microtip field emitter is introduced and characterized in
electromagnetic field simulations in the gun cavity. A series of particle
tracking simulations are conducted for multi-parametric optimization of the
parameters of the produced quasi cw electron beams. The obtained results will
be presented and discussed. In addition, measurements of the parasitic field
emission (PFE) current (dark current) in the PITZ gun will be exemplarily shown
to distinguish its order of magnitude from the produced beam current by the
designed field emitter.Comment: 23 pages, 17 figure
Bunch Charge Stability & Cathoderesponse Time - Experimental investigations on bunch emission effects
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