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Status and applications of Tandetron AMS system-II at Nagoya University in 2007(Proceedings of the 20^<th> Symposium on Chronological Studies at the Nagoya University Center for Chronological Research in 2007)

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  • 名古屋大学タンデトロン2号機の現状と利用(2007年)(第 20回名古屋大学年代測定総合研究センターシンポジウム平成19(2007)年度報告)

Abstract

A second ^<14>C-AMS system (Model 4130-AMS), built by High Voltage Engineering Europe (HVEE), B.V., The Netherlands, was delivered to Nagoya University in 1996/97. Acceptance tests were completed in January of 1999, and routine measurements began in mid-2000. Since completion of the acceptance tests in early 1999, we have encountered a lot of troubles with the machine, particularly in 2002. Since the end of 2002, the machine has relatively worked well, expect for minor problems. However, since June in 2006, we had a serious problem with the high voltage generation system. We opened the accelerator tank twice, in October of 2006 and July of 2007, and replaced each time totally 154 diodes and 5 resistors, 230 diodes and 5 resistors, respectively, for the high-voltage generator system used to rectify the AC power source and stabilize the DC current. Thus the number of targets measured was 1384 in 2007, which was almost the two-third of that in normal year. We also encountered troubles with (1) spark-oriented damage of a high voltage controller module, (2) a cooling system of the power generator for the analyzing magnets both for high energy and low energy beams. The cooling-water flow for the power generator was disturbed by chemical deposits in water tubes, and was not plenty enough to cool down the generator. A thermo-switch stopped the generator for safety and thus we could not operate the analyzing magnets. We replaced the damaged tubes to new ones. This trouble also limited the number of targets measured. Since November 1^<st>, 2007, we had a scheduled shutdown of the AMS system, owing to the improvements of the building, Furukawa Memorial Hall, against earthquake invasion expected in near future around Tokai area, central Japan, In April of 2008, we will start ^<14>C measurements again, possibly in a new good condition of the building.

第20回名古屋大学年代測定総合研究センターシンポジウム平成19(2007)年度報告<第2部> Proceedings of the 20th symposiumon on Chronological Studies at the Nagoya University Center for Chronological Research\in 2007 日時:平成20 (2008)年1月10日(木)~11日(金) 会場:名古屋大学野依記念学術交流館 Date:January10th-11th, 2008 Venue:Nagoya Uhiversity Noyori Conference Hall

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