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首页> 外文学位 >Improvement of ion-beam energy resolution in a solenoid-based radioactive nuclear beam facility.
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Improvement of ion-beam energy resolution in a solenoid-based radioactive nuclear beam facility.

机译：基于螺线管的放射性核束设施中离子束能量分辨率的提高。

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摘要

Two methods of improving the energy resolution in a solenoid-based radioactive nuclear beam (RNB) facility (TwinSol) are described in this dissertation. The test of the absorber-energy-compensation method revealed the misalignment of the TwinSol optical and magnetic axis which was further investigated using a custom-made Gafchromic RTM EBT medical X-ray film. This film was found to be ideal to image secondary RNBs in TwinSol and facilitate designing beam collimators to improve beam purity. In addition an MCP-ToF system was designed and tested along with development of a custom CAMAC-based data acquisition and analysis system. A new 32" ISO-250 vacuum chamber was designed, constructed and installed for facilitating the time-of-flight method with both intrinsic r.f. beam pulsing and cross-over timing detectors. An improved energy resolution (x 2) was obtained (ca. 1 MeV FWHM to 0.5 MeV FWHM). The Coulomb excitation of 8Li using gold targets was measured utilizing the ToF method with the new chamber. The results are consistent with earlier TwinSol measurements indicating an unusually large B(E2)↑ for 8Li* (Ex=0.98 MeV, Jpi=1+).
机译：本文介绍了两种提高螺线管式放射性核束装置（TwinSol）中能量分辨率的方法。吸收体能量补偿方法的测试表明，TwinSol光轴和磁轴未对准，并使用定制的Gafchromic RTM EBT医用X射线胶片进一步研究了该偏差。发现该膜非常适合在TwinSol中成像二次RNB，并有助于设计光束准直仪以提高光束纯度。此外，还设计并测试了MCP-ToF系统，并开发了基于CAMAC的定制数据采集和分析系统。设计，建造和安装了新的32英寸ISO-250真空室，以便于使用固有rf光束脉冲和交叉定时检测器的飞行时间方法。获得了改进的能量分辨率（x 2）（ca. 1 MeV FWHM至<0.5 MeV FWHM）。使用ToF方法在新腔室中使用金靶测量了8Li的库仑激发。结果与早期的TwinSol测量结果一致，表明8Li *的B（E2）↑非常大（ Ex = 0.98 MeV，Jpi = 1 +）。

著录项

  • 作者

    Jiang, Hao.;

  • 作者单位

    University of Michigan.;

  • 授予单位 University of Michigan.;
  • 学科 Engineering Nuclear.
  • 学位 Ph.D.
  • 年度 2010
  • 页码 207 p.
  • 总页数 207
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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