Cryogenic atomic beam source at VEPP-3
摘要
The experiment on elastic and inelastic scattering of 2 GeV electrons by internal polarized target is in progress at the VEPP-3 storage ring in Novosibirsk. It’s carried out by Novosibirsk/St.-Petersburg/Tomsk/Argonne/Illinois/NIKHEF collaboration. A cryogenic Atomic Beam Source having five superconducting sextupoles is under manufacturing to feed by polarized deuterium atoms an internal storage cell target. All the magnets have been manufactured and tested. The magnetic poletip field up to 4.8 T was measured at the cylindrical magnets having 44 mm inner diameter while 3.1 T and 4.0 T were measured for the tapered magnets. The dissociation degree of about 90% has been achieved for a gas throughput 1 mb×1/sec. The expected flux of polarized deuterium atoms into the storage cell is 1.0×1017 at/sec (in two substrates). The geometry of the magnetic system, results on the dissociation measurements, testing of the superconducting magnet and expected parameters of the target are presented.