کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8042581 | 1518711 | 2013 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Short-time change of heavy-ion microbeams with different mass to charge ratios by scaling method for the JAEA AVF cyclotron
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سطوح، پوششها و فیلمها
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چکیده انگلیسی
The JAEA AVF cyclotron provides heavy-ion beams covering a wide range of linear-energy-transfers for microbeam formation. Two types of microbeam formation systems, one using a micro-aperture and the other focusing lenses, are installed on two vertical beam lines of the cyclotron. The average beam time for an experiment using the former system is usually less than 3Â h, that is comparable to the time for cyclotron tuning. The time ratio between experiment and tuning determines the usage efficiency of the facility. In order to reduce the tuning time, a scaling method has been introduced to change the ion species with various mass to charge ratios (M/Q) in a shorter total time. The principle of the scaling method is to keep the magnetic rigidity of ion beams constant. This requirement is easily achieved by adjusting the extraction voltage of an ion source proportionally to the M/Q in the beam injection line. Although some cyclotron adjustments, other than the magnetic field strength at the extraction radius, are required, the tuning can be completed within 20Â min, and no change is basically required in the beam transport line downstream of the cyclotron. Using the scaling method, 255Â MeV 20Ne7+, 335Â MeV 20Ne8+, and 440Â MeV 40Ar13+ beams were extracted from the cyclotron in sequence after the usual tuning of a 220Â MeV 12C5+. As a result, we have succeeded in changing the ion species of the heavy-ion microbeam within a total of 30Â min.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms - Volume 306, 1 July 2013, Pages 40-43
Journal: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms - Volume 306, 1 July 2013, Pages 40-43
نویسندگان
Satoshi Kurashima, Susumu Okumura, Nobumasa Miyawaki, Hirotsugu Kashiwagi, Takahiro Satoh, Tomihiro Kamiya, Mitsuhiro Fukuda, Watalu Yokota,