Development of calibration sources for proton spectroscopy
Mardi 4 juillet 2017 10:00
- Duree : 1 heure
Lieu : ILL, Amphi Chadwick - 71 avenue des Martyrs - Grenoble
Orateur : Soutenance de Thèse de Romain VIROT
Proton spectroscopy in neutron beta decay gives a complementary access to λ (ratio of the weak coupling constants gA/gV ) and enables new searches for physics beyond the Standard Model. In experiment, low-energy protons (E< 751.4 eV) are usually guided and selected using electromagnetic fields. Precise knowledge of the electrostatic potentials (to a level of a few mV) is mandatory as they can drastically bias proton selection. Since experimental conditions directly impact the field (temperature effects on electrode position and work function, surface conditions, etc.), it is mandatory that electrostatic measurements are performed in-situ. Furthermore, in-situ detector calibration is important for systematic effects related to resolution, homogeneity, backscattering probability etc. The protons from neutron decay itself are not suitable for this purpose because of their broad energy distribution and insufficient localization.
CALIPSO (CALIbration Positron/proton Source) is a two-in-one calibration source developed to fulfill the requirements described above : comparing electrode potentials in-situ with an accuracy better than 10 mV using moderated positrons and calibrating proton detectors using a proton source based on Electron Stimulated Desorption.
This seminar details the concept, design and preliminary performances of the CALIPSO source as well as the design and characteristics of the test setup used to develop CALISPO : the aSPECTino spectrometer.
Contact : tellier@ill.fr
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