scholarly journals Evaluation of Bunch Length by Measuring Coherent Synchrotron Radiation with a Narrow-Band Detector at LEBRA

2020 ◽  
Vol 5 (2) ◽  
pp. 34
Author(s):  
Takeshi Sakai ◽  
Ken Hayakawa ◽  
Toshinari Tanaka ◽  
Yasushi Hayakawa ◽  
Kyoko Nogami ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Electron Bunch ◽  
Narrow Band ◽  
Bunch Length ◽  
High Time Resolution ◽  
Accelerator Facility ◽  
Coherent Synchrotron Radiation ◽  
Novel Technology ◽  
Time Observation ◽  
The Relationship

This study presents a novel technology to measure electron bunch length with a high time resolution by measuring coherent synchrotron radiation using a narrow-band detector at Laboratory for Electron Beam Research and Application (LEBRA)—an S-band linear accelerator facility for free-electron lasers. The form factor was observed to decrease exponentially with charge—in concordance with the relationship between the intensity of the coherent synchrotron radiation and the magnitude of electron bunch charge—in the region in which the effect of electron bunch charge on bunch length is negligible. The calculated root-mean-square bunch length was observed to agree well with the value determined from the spectral shape obtained. The aforementioned results are expected to be useful in real-time observation of small changes in electron bunches in advanced accelerators.

A fast coherent synchrotron radiation monitor for the bunch length of the short CEBAF bunches

1996 ◽  
Author(s):  
D. X. Wang ◽  
G. A. Krafft ◽  
E. Price ◽  
P. Wood ◽  
D. Porterfield ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Bunch Length ◽  
Radiation Monitor ◽  
Coherent Synchrotron Radiation

scholarly journals Cross-Correlation of THz Pulses from the Electron Storage Ring BESSY II

2020 ◽  
Vol 5 (2) ◽  
pp. 24
Author(s):  
Ulrich Schade ◽  
Peter Kuske ◽  
Jongseok Lee ◽  
Barbara Marchetti ◽  
Michele Ortolani
Keyword(s):  
Synchrotron Radiation ◽  
Storage Ring ◽  
Time Domain ◽  
Cross Correlation ◽  
Bunch Length ◽  
Pump Probe ◽  
Electron Storage ◽  
Coherent Synchrotron Radiation ◽  
Longitudinal Length ◽  
The Time Domain

Coherent synchrotron radiation from an electron storage ring is observed in the THz spectral range when the bunch length is shortened down to the sub-mm-range. With increasing stored current, the bunch becomes longitudinally unstable and modulates the THz emission in the time domain. These micro-instabilities are investigated at the electron storage ring BESSY II by means of cross-correlation of the THz fields from successive bunches. The investigations allow deriving the longitudinal length scale of the micro bunch fluctuations and show that it grows faster than the current-dependent bunch length. Our findings will help to set the limits for the possible time resolution for pump-probe experiments achieved with coherent THz synchrotron radiation from a storage ring.

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