Calibration of the low-energy channel Thomson parabola of the LMJ-PETAL diagnostic SEPAGE with protons and carbon ions

The SEPAGE diagnostic will detect charged particles (electrons, protons, and ions) accelerated in the interaction of the PETAL(PETawatt Aquitaine Laser) laser with its targets on the LMJ ( Laser MegaJoule)– PETALlaser facility. SEPAGE will be equipped with a proton-radiography front detector and two Thomson parabolas(TP), corresponding to different ranges of the particle energy spectra: Above 0.1 MeV for electrons and protonsin the low-energy channel, with a separation capability between protonsand 12C6+ up to 20 MeV protonenergy and above 8 MeV for the high-energy channel, with a separation capability between protonsand 12C6+ up to 200 MeV protonkinetic energy. This paper presents the calibration of the SEPAGE’s low-energy channel TP at the Tandem facility of Orsay (France) with protonbeams between 3 and 22 MeV and carbon-ion beams from 5.8 to 84 MeV. The magnetic and electric fields’ integrals were determined with an accuracy of 10−3 by combining the deflections measured at different energies wit...