Liquid helium-free cryostat and hermetically sealed cryogenic microwave cavity for hyperfine spectroscopy of antiprotonic helium
| Autor: | O. Massiczek, Johann Zmeskal, B. Juhász, Eberhard Widmann, S. Friedreich |
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| Rok vydání: | 2011 |
| Předmět: |
Physics
Cryostat Nuclear and High Energy Physics Physics::Instrumentation and Detectors Liquid helium Cavity Antiproton Laser chemistry.chemical_element Cryocooler Helium Article Coolant law.invention Helium-4 chemistry law Physics::Atomic Physics Atomic physics Microwave Instrumentation Antiprotonic helium Microwave cavity |
| Zdroj: | Nuclear Instruments & Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment |
| ISSN: | 0168-9002 |
| DOI: | 10.1016/j.nima.2011.07.039 |
| Popis: | The design and properties of a new cryogenic set-up for laser–microwave–laser hyperfine structure spectroscopy of antiprotonic helium – an experiment performed at the CERN-Antiproton Decelerator (AD), Geneva, Switzerland – are described. Similar experiments for 4He have been performed at the AD for several years. Due to the usage of a liquid helium operated cryostat and therefore necessary refilling of coolants, a loss of up to 10% beamtime occurred. The decision was made to change the cooling system to a closed-circuit cryocooler. New hermetically sealed target cells with minimised 3He gas volume and different dimensions of the microwave resonator for measuring the 3He transitions were needed. A new set-up has been designed and tested at Stefan Meyer Institute in Vienna before being used for the 2009 and 2010 beamtimes at the AD. |
| Databáze: | OpenAIRE |
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