Gießen 2007 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 44: Instrumentation und Anwendungen
HK 44.6: Talk
Thursday, March 15, 2007, 12:30–12:45, E
Droplet production from thin cryogenic jets with the Moscow-Jülich Pellet Target — •Pavel Fedorets1,2, Markus Büscher2, Alexander Bukharov3, Viacheslaw Chernetsky1, Valery Chernyshev1, Alexander Gerasimov1, and Alexander Semenov3 — 1ITEP, Moscow, Russia — 2Forschungszentrum Jülich, Germany — 3MPEI, Moscow, Russia
Targets of frozen droplets (“pellets”) from various liquefiable gases like H2, D2, N2, Ne, Ar, Kr and Xe are very promising for high luminosity experiments in a 4π detector geometry at storage-rings. High effective target densities (>1015atoms/cm2), a small target size (⊘≈20−30µm) and a narrow pellet beam are the main advantages of such targets.
A target has been under construction at the IKP of FZJ in collaboration with two institutes from Moscow, Russia. It is developed as a prototype for the future pellet target at the PANDA experiment at FAIR/HESR. This target uses liquid nitrogen and cold evaporated helium gas for cooling. The automatically refilled baths with liquid nitrogen and liquid helium are located inside the target cryostat. The main advantages of this method are the vibration-free cooling and the possibility for liquid cryogenic jet production from various gases in a wide range of temperatures. Different regimes of pellet production from H2 and N2 have been observed and their parameters have been measured during the tests.
Supported by FZJ, DFG, RFFI, COSY-FFE, EC.