Abstract
The 750 MHz PIXE-RFQ (radio-frequency quadrupole), developed and built at CERN, provides 2 MeV protons over a length of one meter for proton-induced X-ray emission analysis (PIXE) of cultural heritage artwork. In this paper, we report low-power rf measurements and tuning of the PIXE-RFQ, which have been completed mid-2020. Using a novel algorithm based on direct measurements of the response matrix, field and frequency could be tuned at the same time in only two steps to satisfying accuracy. Additionally, we report measurements of single modules, quality factors, and coupling strength. In all cases, very good agreement between rf measurement and design values was observed.
Highlights
Construction, and commissioning of the HF-RFQ, a compact 750 MHz radio-frequency quadrupole (RFQ) for medical applications [1,2,3,4,5,6,7,8], CERN initiated the development of a new RFQ operating at this high frequency in mid-2017
The proton-induced X-ray emission analysis (PIXE)-RFQ has been developed in the context of the MACHINA collaboration (Movable Accelerator for Cultural Heritage In-situ Nondestructive Analysis) between CERN and INFN [11,13]
The quality factors of the PIXE-RFQ were measured under vacuum to validate the design and provide information on the input power reflection originating in potential over- or under-coupling
Summary
Construction, and commissioning of the HF-RFQ, a compact 750 MHz radio-frequency quadrupole (RFQ) for medical applications [1,2,3,4,5,6,7,8], CERN initiated the development of a new RFQ operating at this high frequency in mid-2017. The PIXE-RFQ has been developed in the context of the MACHINA collaboration (Movable Accelerator for Cultural Heritage In-situ Nondestructive Analysis) between CERN and INFN [11,13]. The aim of the project is to build the first transportable system for proton-induced X-ray emission analysis (PIXE) of cultural heritage artwork, allowing deployment in museums, restoration centers, or even in the field. Lowpower rf measurements and tuning of the 750 MHz four-vane RFQ have been completed in mid-2020
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