A vacuum-sealed compact x-ray tube based on focused carbon nanotube field-emission electrons

被引：116
作者：
Jeong, Jin-Woo [1 ]
Kim, Jae-Woo [1 ,2 ]
Kang, Jun-Tae [1 ]
Choi, Sungyoul [1 ]
Ahn, Seungjoon [1 ,3 ]
Song, Yoon-Ho [1 ,2 ]
机构：
[1] Elect & Telecommun Res Inst, Nano Electron Source Creat Res Ctr, Taejon 305700, South Korea
[2] Univ Sci & Technol, Sch Adv Device Engn, Taejon 305350, South Korea
[3] Sun Moon Univ, Dept Informat Display, Asan 336708, Chungnam, South Korea
来源：
NANOTECHNOLOGY | 2013年 / 24卷 / 08期
关键词：
D O I：
10.1088/0957-4484/24/8/085201
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
We report on a fully vacuum-sealed compact x-ray tube based on focused carbon nanotube (CNT) field-emission electrons for various radiography applications. The specially designed two-step brazing process enabled us to accomplish a good vacuum level for the stable and reliable operation of the x-ray tube without any active vacuum pump. Also, the integrated focusing electrodes in the field-emission electron gun focused electron beams from the CNT emitters onto the anode target effectively, giving a small focal spot of around 0.3 mm with a large current of above 50 mA. The active-current control through the cathode electrode of the x-ray tube led a fast digital modulation of x-ray dose with a low voltage of below 5 V. The fabricated compact x-ray tube showed a stable and reliable operation, indicating good maintenance of a vacuum level of below 5 x 10(-6) Torr and the possibility of field-emission x-ray tubes in a stand-alone device without an active pumping system.
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页数：8
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