Status report of the 1 MV AMS facility at the Centro Nacional de Aceleradores

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• 作者：Elena Chamizo Calvo^a ; ; Francisco Javier Santos^a ; José ; Marí ; a Ló ; pez-Gutié ; rrez^a ; ^b ; Santiago Padilla^a ; Manuel Garcí ; a-Leó ; n^a ; ^c ; Jan Heinemeier^d ; Christoph Schnabel^b ; Grazia Scognamiglio^a
• 关键词：AMS ; Status ; CNA ; Accelerator Mass Spectrometry ; HVEE
• 刊名：Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
• 出版年：2015
• 出版时间：15 October 2015
• 年：2015
• 卷：361
• 期：Complete
• 页码：13-19
• 全文大小：1259 K

文摘

SARA (Spanish Accelerator for Radionuclides Analysis) was the first multielemental AMS facility installed in Spain in 2005. Since then it has been dedicated to the routine analysis of several radionuclides, such as ¹⁰Be, ¹⁴C, ²⁶Al, ¹²⁹I and Pu isotopes. Tests have been carried out with other isotopes, such as ⁴¹Ca, ²³⁶U and ²³⁷Np, and several changes have been made to the original facility to improve performance. First, an upgraded version of the ion source SO-110 has allowed us more stable measurement conditions for volatile elements (i.e. iodine), and a better general performance. Besides, changes in the target geometry have improved the ionization efficiency and long-term stability of the source output. Moreover, different software upgrades have been introduced to meet our routine operational needs. Finally, changing the movable Faraday-cup associated electronics now allows the measurement of smaller currents (in the range of pA), which has been key for the study of ²³⁶U/²³⁸U atomic ratio in environmental samples. Apart from these modifications it has to be noted that routine radiocarbon measurements have been moved to a Micadas system (200 kV) installed at CNA in 2012. In this paper we will illustrate the evolution of the facility up to now, and our future prospects will be introduced.