Mainz 2012 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 26: Instrumentation

HK 26.7: Talk

Wednesday, March 21, 2012, 15:45–16:00, P 2

A Wide Temperature Range Irradiation Cryostat for Reasearch on Solid State Targets — Scott Reeve, •Hartmut Dutz, Stefan Goertz, Stefan Runkel, and Thomas Voge — Physikalisches Institut, Universität Bonn, Nußallee 12, 53115, Bonn

To qualitatively improve the data obtained in asymmetry measurements of scattering experiments the figure of merit (FOM) plays a major role and can reduce the data acquisition time when a certain precision in the measurement is needed. One of the defining factors for the improvement of the polarised experiment lies in the target choice and preparation, in particular the method employed to introduce the paramagnetic defects for the use of dynamic nuclear polarisation (DNP). To this end the Polarized Target Group in Bonn has developed a wide range temperature cryostat for the irradiation of potential target materials in which materials can be irradiated to varying doses at specified temperatures. The stable irradiation temperature of the materials can be controlled to within ±1 K over a range of 90 K < T < 270 K.