title: An electron beam profile instrument based on FBGs.
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.
authors.affiliation: National Institute Laser, Plasma and Radiation Physics, 409 Atomiştilor St., Măgurele, RO-077125, Romania. dan.sporea@inflpr.ro.
authors.forename: Dan
authors.initials: D
authors.lastname: Sporea
authors.affiliation: National Institute Laser, Plasma and Radiation Physics, 409 Atomiştilor St., Măgurele, RO-077125, Romania. andrei.stancalie@inflpr.ro.
authors.forename: Andrei
authors.initials: A
authors.lastname: Stăncălie
authors.affiliation: Apel Laser, 15 Vintila Mihăilescu St., Bucharest, RO-060394, Romania. nicu.becherescu@apellaser.ro.
authors.forename: Nicu
authors.initials: N
authors.lastname: Becherescu
authors.affiliation: Leibniz Institute of Photonic Technology, Albert Einstein Str. 9, Jena 07745, Germany. Martin.Becker@ipht-jena.de.
authors.forename: Martin
authors.initials: M
authors.lastname: Becker
authors.affiliation: Leibniz Institute of Photonic Technology, Albert Einstein Str. 9, Jena 07745, Germany. Manfred.Rothhardt@ipht-jena.de.
authors.forename: Manfred
authors.initials: M
authors.lastname: Rothhardt
mesh_terms: D004583:Electrons; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D011829:Radiation Dosage; D011874:Radiometry / Q000295:instrumentation*; D012031:Refractometry / Q000295:instrumentation*