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51 st SNEAP Symposium, September 23-27, 2018

Current status of the single-stage AMS at the Atmosphere and Ocean Research Institute, The University of Tokyo. 51 st SNEAP Symposium, September 23-27, 2018. Takahiro Aze, Yosuke Miyairi, Yusuke Yokoyama. Atmosphere and Ocean Research Institute, The University of Tokyo, Japan. Outline.

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51 st SNEAP Symposium, September 23-27, 2018

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  1. Current status of the single-stage AMS at the Atmosphere and Ocean Research Institute, The University of Tokyo 51st SNEAPSymposium,September23-27, 2018 Takahiro Aze, Yosuke Miyairi, Yusuke Yokoyama Atmosphere and Ocean Research Institute, The University of Tokyo, Japan

  2. Outline • Introduction of our facility • SingleStageAMS and 14C-AMS system • Operating history of the first 5 years • Software development • Beamline alignment • Blackout accident due to lightning • Summary

  3. Introduction of AORI, the University of Tokyo Locationofcampus AtmosphereandOceanResearchInstitute AORI was established in the University of Tokyo by a merger of the Ocean Research Institute and the Center Of Climate System Research in 2010.

  4. Introduction of LAMS, AORI Laboratory for Accelerator Mass Spectrometry The first Single Stage AMS in Japan from National Electrostatics Corporation was installed at the AORI, the University of Tokyo in March 2013.

  5. History of LAMS

  6. Introduction of our facility Stability in the machine room Room temperature: ± 0.25 ℃ (1σ) Relative humidity: ± 1.3 %(1σ) Schematicdiagram of the facility Single-Stage AMS

  7. Outline of YS-AMS

  8. Sequential Injection system B: 100 ms A: 2.6 ms -3.5 kV 2.0 kV SPD(Sequential Post-accelerator Deflector)

  9. Calibration curve

  10. Facility activity history Overview of Fiscal Year 2017 (April to March) Operation time of the accelerator 7722 hour Number of measurement samples 3267(Include reference sample) Source cleaning 4times Exchange of cesium 2times Replace stripper gas cylinder 1times

  11. Characteristics of AORI 14C-AMS system

  12. YS-AMS View • GUI software for Windows • Easy and quick view of the measurement results • Three gate settings ( 14C event, transmission, cycle) • Rebuild the runlog

  13. New flattop software

  14. Beamline alignment 1 90°line Transit X: -0.3 mm, Y: 0.0mm X: -0.3 mm, Y: 0.0mm X: +0.5 mm, Y: 0.0mm X: +0.6 mm, Y: 0.0mm X: +1.3 mm, Y: 0.0mm X: +1.4 mm, Y: 0.0mm 180°line X: 0 mm Y: 0 mm X: -1.0 mm Y: 0.0 mm plummet July 2014

  15. Beamline alignment 2 0°line X: 0 mm Y: 0 mm 90°line Transit Transit X: -0.3 mm, Y: 0.0mm X: -0.3 mm, Y: 0.0mm X: +2.0 mm, Y: 0.0mm X: +2.0 mm, Y: 0.0mm X: +2.0 mm, Y: 0.0mm X: +0.0 mm, Y: 0.0mm X: +0.0 mm, Y: 0.0mm X: 0.0 mm Y: 0.0 mm 180°line X: 0 mm Y: 0 mm X: 0.0 mm Y: 0.0 mm plummet November 2015

  16. Beamline alignment 3 0°line X: +3.0 mm Y: +1.0mm 90°line Transit Transit X: -0.5 mm, Y: 0.2mm X: -0.5 mm, Y: 0.1mm X: -0.5 mm, Y: -0.2mm X: -0.5 mm, Y: 0.5mm X: -0.2 mm, Y: 0.0mm X: -1.0 mm, Y: +1.0mm X: -0.2 mm, Y: -0.2mm X: +0.1 mm, Y: -0.3mm X: +0.5 mm, Y: -0.3mm X: +0.2 mm, Y: 0.1mm X: +1.0 mm Y: 0.0mm 180°line X: +1.0 mm Y: +0.2mm X: 0.0 mm Y: 0.0 mm Transit X: +0.5 mm Y: +0.2 mm plummet July 2018

  17. Comparison before and after alignment after before The four position profiles in MBS for 12C

  18. Blackout accident A blackout occurred due to lightning on 31 August.

  19. Summary ・The Single-Stage AMS was Installed to AORIinMarch2013. ・High throughput and high precision measurements have been achieved. ・We continue to develop software for better measurement. ・Three beamline alignments were performed, and the performance was greatly improved. ・The MBS power supply made by TREK was broken down due to a lightning strike. The machine stopped for about a month.

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