Abstract
Along with the dose rate and the total irradiation dose measurements, the knowledge of the beam localization and the beam profile/energy distribution in the beam are parameters of interest for charged particle accelerator installations when they are used in scientific investigations, industrial applications or medical treatments. The transverse profile of the beam, its position, its centroid location, and its focus or flatness depend on the instrument operating conditions or on the beam exit setup. Proof-of-concept of a new type of charged particle beam diagnostics based on fiber Bragg gratings (FBGs) was demonstrated. Its operating principle relies on the measurement of the peak wavelength changes for an array of FBG sensors as function of the temperature following the exposure to an electron beam. Periodically, the sensor irradiation is stopped and the FBG are force cooled to a reference temperature with which the temperature influencing each sensor during beam exposure is compared. Commercially available FBGs, and FBGs written in radiation resistant optical fibers, were tested under electron beam irradiation in order to study their possible use in this application.
Highlights
Along with the dose rate and the total irradiation dose measurements, the knowledge of the beam localization and the beam profile/energy distribution in the beam are parameters of interest for charged particle accelerator installations when they are used in scientific investigations, industrial applications or medical treatments
The basic idea of the instrument relies on the wavelength change of fiber Bragg gratings (FBGs) exposed to an electron beam as their temperature increases because of the energy they receive from the incident charged particles
The beam diagnostics method and equipment we present here has several advantages over classical approaches: it is a non-invasive method; it can be operated remotely and under high electromagnetic fields; vacuum operation is achieved; daisy-chained and wavelength multiplexing setups make the extension of the number of sampling locations possible; and no moving parts are placed in the detection plane
Summary
Along with the dose rate and the total irradiation dose measurements, the knowledge of the beam localization and the beam profile/energy distribution in the beam are parameters of interest for charged particle accelerator installations when they are used in scientific investigations, industrial applications or medical treatments. The transverse profile of the beam, its position, its centroid location and its focus or flatness depend on the instrument operating conditions or on the beam exit setup. Various methods have been proposed to evaluate the beam transverse profile: arrays of Faraday cups [1,2]; ionization chamber and imaging plates [3]; micro strip metal detector [4]; pepper-pot device, slit-grid method [5] or rotating slits [6]; Optical Transition Radiation (OTR), Secondary. The present paper reports the proof-of-concept (the design and the implementation) of a beam profile instrument for electron beams, based on an array of fiber Bragg gratings (FBGs).
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