Abstract
A method to monitor the length of a particle bunch, based on the combination of a Radio Frequency Deflector (RFD) with magnetic focusing elements, is presented. With respect to state-of-the-art bunch length measurement, the additional focusing element allows to measure also the correlations between the longitudinal and transverse planes in terms of both position and divergence. Furthermore, the quadrupole-based focusing increases the input dynamic range of the measurement system (i.e. allows for a larger range of beam Twiss parameters at the entrance of the RFD). Thus, measurement resolution and precision are enhanced, by simultaneously preserving the accuracy. In this paper, the method is first introduced analytically, and then validated in simulation, by the reference tool ELEctron Generation ANd Tracking, ELEGANT. Finally, a preliminary experimental validation at CLEAR (CERN Linear Electron Accelerator for Research) is reported.
Highlights
In monitoring LINear ACcelerators (LINACs), one of the main parameters to be precisely measured is the bunch length
In various accelerators, focusing elements are installed between the Radio Frequency Deflector (RFD) and the screen (e.g. CLEAR11, ATF31, and D ESY32) for various reasons
All the derived equations have been numerically validated by means of the ELEGANT code
Summary
In monitoring LINear ACcelerators (LINACs), one of the main parameters to be precisely measured is the bunch length. For the measurement (Fig. 1, bottom), a time-dependent transverse kick is given to the electron b unch[6]. In this way, the longitudinal and transverse bunch dimensions of the beam on the screen are correlated. The method allows to measure ultra-short electron beam bunches down to few fs[1,3,8,9]. The combination of an RFD and a dispersive element (i.e. a dipole) can be exploited to measure the longitudinal phase space distribution of the b eam[7,10]. In various accelerators, focusing elements are installed between the RFD and the screen The space between the RFD and the screen is just needed to deflect enough the bunch (Fig. 1). The impact on the RFD measurement quality of the position of the focusing element was not investigated until now
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