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HK: Physik der Hadronen und Kerne

HK 45: Instrumentation and Applications VI

HK 45.3: Talk

Thursday, March 11, 2004, 17:15–17:30, C

Status of the ANKE pellet target^⋆ — •P. Fedorets¹, V. Balanutsa¹, W. Borgs², M. Büscher², A. Bukharov³, V. Chernetsky¹, V. Chernyshev¹, M. Chumakov¹, A. Gerasimov¹, V. Goryachev¹, L. Gusev¹, and S. Podchasky¹ — ¹ITEP, Moscow, Russia — ²Forschungszentrum Jülich, Germany — ³MPEI, Moscow, Russia

The use of frozen micro spheres (“pellets”) of solid hydrogen or deuterium offers new possibilities for high luminosity experiments at internal accelerator beams. A pellet target is under construction at COSY-Jülich to study meson production in pp, pn, pd and dd collisions. It is expected that luminosities higher than L=10³² cm⁻²s⁻¹ can be obtained and, consequently, processes with cross sections in the sub-nb regime can be studied. In a pellet target, a jet of liquid hydrogen is produced inside a cryogenic chamber, the temperature of which is kept close to the triple point value (T_tr=14 K, p_tr∼ 100 mbar for hydrogen) with an accuracy of better than 0.1 K. The liquid hydrogen jet is broken into microdroplets by acoustic excitation. During flight into the accelerator vacuum the droplets freeze and a continuous flow of frozen hydrogen pellets with diameters down to ∼ 20  µm is generated. The status of the ANKE pellet target and the results of first tests on pellet production will be present. ^⋆Supported by FZJ, BMBF, DFG, RFFI, FFI.