Berlin 2005 – scientific programme
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HK: Physik der Hadronen und Kerne
HK 29: Instrumentation und Anwendungen
HK 29.5: Talk
Tuesday, March 8, 2005, 15:00–15:15, TU MA042
Observation and measurement of hydrogen and nitrogen frozen droplets at the ANKE Pellet Target⋆ — •P. Fedorets1,2, W. Borgs2, M. Büscher2, A. Bukharov3, V. Chernetsky1, and V. Chernyshev1 — 1ITEP, Moscow, Russia — 2Forschungszentrum Jülich, Germany — 3MPEI, Moscow, Russia
Targets of frozen hydrogen and deuterium droplets (“pellets”) have been proposed for high luminosity experiments at internal accelerator beams. Such a pellet target is under construction at COSY-Jülich to study meson production in hadronic interactions. The expected luminosities higher than L=1032 cm−2s−1 will be offer possibility for investigations in the sub-nb range. To produce nuclear micro targets, inside the cryogenic chamber of the target different gases can be liquefied with the help of liquid nitrogen and helium. Liquid jet with diameter down to ∼ 10 µm is formed inside a triple-point chamber (TPC), where conditions are kept close to the triple point values (Ttr=14 K, ptr∼ 100 mbar for hydrogen) with an accuracy of better than 0.1 K (and 5% of pressure). The liquid jet is broken into droplets by acoustic excitation. During flight into the accelerator vacuum the droplets freeze and a continuous flow of frozen pellets with diameters down to ∼ 20 µm is generated. The status of the ANKE pellet target and the results of tests on pellet production with hydrogen and nitrogen will be presented.
⋆Supported by FZJ, BMBF, DFG, RFFI, FFI, EU.