Research on Electrostatic Self-focusing Lanthanum Hexaboride Electron Gun

doi:10.11804/NuclPhysRev.32.S1.38

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Volume 32 Issue S1

Nov. 2015

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Research on Electrostatic Self-focusing Lanthanum Hexaboride Electron Gun[J]. Nuclear Physics Review, 2015, 32(S1): 38-42. doi: 10.11804/NuclPhysRev.32.S1.38

Citation:

Research on Electrostatic Self-focusing Lanthanum Hexaboride Electron Gun[J]. Nuclear Physics Review, 2015, 32(S1): 38-42. doi: 10.11804/NuclPhysRev.32.S1.38

Research on Electrostatic Self-focusing Lanthanum Hexaboride Electron Gun

doi: 10.11804/NuclPhysRev.32.S1.38

1.
School of Opto-electronic Information, University of Electronic
2.
Science and Technology of China, Chengdu 610054, China;

Publish Date: 2015-11-20

Abstract

An electron gun for X-ray tube is designed and produced. The clamping type lanthanum hexaboride cathode with graphite heater is used in replace of the traditional tungsten cathode owing to its excellent electron emission ability. To avoid the leads of focusing electrode, we design a single focusing electrode with a trapezoidal focusing groove and a rectangular hole. Finally, other cathode structures such as cathode cover, cathode support and insulating ceramics are designed and the assembling of electron emitting system is completed. Thermionic emission test shows that when the lanthanum hexaboride emitting area is 4.5 mm0.8 mm, the temperature of cathode is 1500 ℃, and the distance between anode and cathode is 3.5 mm, the anode current is 65 mA at
anode voltage of 2 500 V, and the emission stability is excellent. The test of the X-ray tube based on lanthanum hexaboride electron gun shows that favorable switching performance is obtained at anode voltage of 120 kV.
- X-ray tube,
- electron gun,
- lanthanum hexaboride cathode,
- emitting performance,
- thermionic emitting current
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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

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Research on Electrostatic Self-focusing Lanthanum Hexaboride Electron Gun

doi: 10.11804/NuclPhysRev.32.S1.38

1. School of Opto-electronic Information, University of Electronic

2. Science and Technology of China, Chengdu 610054, China;

Publish Date: 2015-11-20

Key words:

Abstract: An electron gun for X-ray tube is designed and produced. The clamping type lanthanum hexaboride cathode with graphite heater is used in replace of the traditional tungsten cathode owing to its excellent electron emission ability. To avoid the leads of focusing electrode, we design a single focusing electrode with a trapezoidal focusing groove and a rectangular hole. Finally, other cathode structures such as cathode cover, cathode support and insulating ceramics are designed and the assembling of electron emitting system is completed. Thermionic emission test shows that when the lanthanum hexaboride emitting area is 4.5 mm0.8 mm, the temperature of cathode is 1500 ℃, and the distance between anode and cathode is 3.5 mm, the anode current is 65 mA at
anode voltage of 2 500 V, and the emission stability is excellent. The test of the X-ray tube based on lanthanum hexaboride electron gun shows that favorable switching performance is obtained at anode voltage of 120 kV.

Research on Electrostatic Self-focusing Lanthanum Hexaboride Electron Gun[J]. Nuclear Physics Review, 2015, 32(S1): 38-42. doi: 10.11804/NuclPhysRev.32.S1.38

Citation:

Research on Electrostatic Self-focusing Lanthanum Hexaboride Electron Gun[J]. Nuclear Physics Review, 2015, 32(S1): 38-42. doi: 10.11804/NuclPhysRev.32.S1.38