Abstract
A collaboration between DESY, PSI and CERN has developed and built an advanced modular X-band transverse deflection structure (TDS) system with the new feature of providing variable polarization of the deflecting force. The prototype of the novel X-band TDS, the polarizable $X$-band (PolariX) TDS, was fabricated at PSI following the high-precision tuning-free production process developed for the C-band Linac of the SwissFEL project. Bead-pull rf measurements were also performed at PSI to verify, in particular, that the polarization of the dipole fields does not have any rotation along the structure. The high-power test was performed at CERN and now the TDS is at DESY and has been installed in the FLASHForward beamline, where the first streaking experience with beam has been accomplished. We summarize in this paper the rf design of the TDS and its key components, such as the $X$-band pulse compressor, E-rotator, and phase shifter, the results of the bead-pull measurements and the high power test and finally the rf setup at DESY.
Highlights
Transverse deflection structures (TDS) are well known diagnostics devices for the characterization of the longitudinal properties of electron bunches in a linear accelerator [1,2,3,4,5,6,7,8,9,10,11,12,13,14]
The section starts by discussing the mechanical design and continues with the description of the manufacturing process and low-power measurements and in particular the bead-pull measurements to verify that the polarization of the dipole field does not rotate along the structure; Section V presents the results of the high-power conditioning of the transverse deflection structure (TDS) and XBOC carried out at CERN; Section VI describes the rf setup for the first experiment in the FLASHForward beamline at DESY where the expected performance of the structure was validated during the first commissioning with electron beam
Based on the recent development of compact high power X-band rf components at CERN, a new TDS design that enables the variable polarisation of the streaking field has been proposed
Summary
Transverse deflection structures (TDS) are well known diagnostics devices for the characterization of the longitudinal properties of electron bunches in a linear accelerator [1,2,3,4,5,6,7,8,9,10,11,12,13,14]. It is worthwhile noting that this technique could not be realized by using conventional TDSs and makes special use of the possibility of continuously tuning the streaking direction of the dipolelike field in the deflecting structure Combining these novel and more extended beam characterizations with the already proven capability of achieving fs and sub-fs longitudinal resolution of the X-band TDS [8], this diagnostic tool will be able to provide new insight on the multidimensional-beam-phase-space characterization with sub-fs resolution. The section starts by discussing the mechanical design and continues with the description of the manufacturing process and low-power measurements and in particular the bead-pull measurements to verify that the polarization of the dipole field does not rotate along the structure; Section V presents the results of the high-power conditioning of the TDS and XBOC carried out at CERN; Section VI describes the rf setup for the first experiment in the FLASHForward beamline at DESY where the expected performance of the structure was validated during the first commissioning with electron beam
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