2007 IEEE Particle Accelerator Conference (PAC) 2007
DOI: 10.1109/pac.2007.4440133
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Time resolved phase space tomography at flash using a transverse deflecting RF-structure

Abstract: To initiate Self-Amplification of Spontaneous Emission (SASE) in single-pass Free Electron Lasers (FEL), electron bunches with high peak current and small slice emittance are necessary. At FLASH at DESY, this is accomplished by longitudinal shortening in two magnetic bunch compressors. The compression process may be accompanied by distortions from coherent synchrotron radiation (CSR) and space charge (SC) forces. Their effect on transverse phase space can be studied with a vertically deflecting RF-structure, w… Show more

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Cited by 3 publications
(2 citation statements)
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“…3 C). If the projections of the beam at the screen are analyzed using a tomographic algorithm, it is possible to retrieve the transverse-trace-space distribution of each slice [40].…”
Section: Direct Particle Measurementmentioning
confidence: 99%
“…3 C). If the projections of the beam at the screen are analyzed using a tomographic algorithm, it is possible to retrieve the transverse-trace-space distribution of each slice [40].…”
Section: Direct Particle Measurementmentioning
confidence: 99%
“…The calibration factor is defined as the ratio between the beam spot at the screen ( ) and the temporal bunch length ( ) and can be written as (5) By using (5), the time resolution of the measurement can be defined as (6) where is the normalized beam vertical emittance, is the Lorentz factor, and is the natural transverse beam size (i.e., without the transverse deflection). However, as described in [21] and [22], an RF deflecting device induces an additional energy spread proportional to the deflecting voltage, according to the following formula: (7) where keV is the electron rest energy. Fig.…”
Section: Longitudinal and Transverse Phase Space Characterizationmentioning
confidence: 99%