Speaker
Dr
Irakli Keshelashvili
(Forschungszentrum Jülich GmbH)
Description
In the upcoming Jülich Electric Dipole moment Investigations (JEDI) project, the essential point would be to measure tiny beam polarization change over a long period. The particle scarcity in the polarized deuteron or proton beams and its slow extraction rate puts very difficult experimental limitations on the polarimetry. At present, the EDDA detector (build with plastic scintillators) is being used to measure
proton and deuteron beam polarization at the COSY ring. But for the
future EDM measurements, a dedicated high precision polarimeter is
required. The new concept is based on the following principals:
Achieving maximum identification efficiency for the elastic events off carbon target, dead-time less data taking and avoiding strong magnetic and electric fields. Also, the experiment will last over several years,
so the long-term stability and strong radioactive hardness is required.
To fulfill this specifications, a fast, dense, high resolution (energy
and time), and radioactive hard novel crystal scintillating material
LYSO is supposed to be used for particle detection/identification. The
LYSO crystal samples, the PMT/SiPM photo-sensors and its HV dividers are under intensive tests/developments. Also, the SADC based readout system and the beam test of the first prototype is in preparation. In this
presentation, the new polarimetry concept and all above mentioned
activities at COSY will be presented.
Primary author
Dr
Irakli Keshelashvili
(Forschungszentrum Jülich GmbH)
