100 research outputs found
Generation of Multi-Color Attosecond X-Ray Radiation Through Modulation Compression
In this paper, we propose a scheme to generate tunable multi-color attosecond
coherent X-ray radiation for future light source applications. This scheme uses
an energy chirped electron beam, a laser modulators, a laser chirper and two
bunch compressors to generate a multi-spike prebunched kilo-Ampere current
electron beam from a few tens Ampere electron beam out of a linac. Such an
electron beam transports through a series of undulator radiators and bunch
compressors to generate multi-color coherent X-ray radiation. As an
illustration, we present an example to generate two attosecond pulses with
nm and nm coherent X-ray radiation wavelength and more than MW
peak power using a Ampere nm laser seeded electron beam
Machine learning-based direct solver for one-to-many problems of temporal shaping of electron bunches
To control the temporal profile of a charged beam to meet requirements of
various accelerator applications, a widely-used technique is bunch compression
via 4-dipole chicanes that may sometimes have a one-to-many map. Current
approaches based on stochastic optimization or supervised learning can be
limited because of the one-to-many properties. Here we demonstrate how to
construct a direct and real-time solver with the aid of a semi-supervised
machine learning method, the conditional generative adversarial network (CGAN),
to solve one-to-many problems of temporal shaping. Unlike supervised learning
that can only learn one-to-one maps, the CGAN solver can learn the one-to-many
dynamics and accurately predict required longitudinal dispersion terms for a
chicane to realize desired custom temporal profiles without any priori
knowledge. Besides, the CGAN solver can simultaneously give multiple different
solutions for a one-to-many problem, which breaks the limitation of stochastic
optimization methods of finding one solution instead of many
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Linac Coherent Light Source (LCLS) Bunch-Length Monitor using Coherent Radiation
The Linac Coherent Light Source (LCLS) is a SASE x-ray Free-Electron Laser (FEL) based on the final kilometer of the Stanford Linear Accelerator. One of the most critical diagnostic devices is the bunch length monitor (BLM), which is to be installed right after each compressor utilizing coherent radiation from the last bending magnet. We describe the components and the optical layout of such a BLM. Based on the setup geometry, we discuss some issues about the coherent radiation signal
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