Massiczek O, Friedreich S, Juhász B, Widmann E, Zmeskal J
Stefan Meyer Institute for Subatomic Physics, Austrian Academy of Sciences, Boltzmanngasse 3, 1090 Vienna, Austria.
Nucl Instrum Methods Phys Res A. 2011 Dec 11;659(1-3):55-60. doi: 10.1016/j.nima.2011.07.039.
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 (4)He 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 (3)He gas volume and different dimensions of the microwave resonator for measuring the (3)He 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.
描述了一种用于反质子化氦的激光 - 微波 - 激光超精细结构光谱的新型低温装置的设计和特性——该实验在瑞士日内瓦的欧洲核子研究组织反质子减速器（AD）进行。多年来，在AD上对（4）He进行了类似实验。由于使用了液氦操作的低温恒温器，因此需要定期补充冷却剂，导致束流时间损失高达10%。于是决定将冷却系统改为闭路低温制冷机。需要新的气密密封靶室，其（3）He气体体积最小化，并且需要不同尺寸的用于测量（3）He跃迁的微波谐振器。在用于2009年和2010年AD的束流时间之前，一种新装置已在维也纳的斯特凡·迈耶研究所设计并进行了测试。
