Fabrication and Evaluation of B4C/Cu FGM as Plasma Facing Materials

2005 ◽  
Vol 475-479 ◽  
pp. 1475-1478 ◽  
Author(s):  
Zhang Jian Zhou ◽  
Chang Chun Ge
Keyword(s):  
Load Resistance ◽  
High Heat ◽  
Plasma Irradiation ◽  
Physical Sputtering ◽  
Heat Loading ◽  
Graded Material ◽  
High Heat Load ◽  
Plasma Facing Materials ◽  
Distribution Water

B4C is a promising candidate for using as plasma-facing material in fusion devices. In this paper, both B4C/Cu coating FGM (Funetionally graded material) and B4C/Cu bulk FGM containing a spectrum of 0-100% compositional distributions of B4C were fabricated by atmosphere plasma spray and ultra-high pressure consolidation respectively. The microstructure of B4C/Cu FGM showed good graded composition distribution. Water quenching and high heat loading experiments using an electron beam were carried out to evaluate the high heat load resistance of B4C/Cu FGMs. The in situ plasma irradiation in a Tokamak facility showed that the B4C/Cu bulk FGM has higher physical sputtering performance than that of B4C/Cu coating FGM.

scholarly journals Vibration measurements of high-heat-load monochromators for DESY PETRA III extension

2015 ◽  
Vol 22 (4) ◽  
pp. 879-885 ◽  
Author(s):  
Paw Kristiansen ◽  
Jan Horbach ◽  
Ralph Döhrmann ◽  
Joachim Heuer
Keyword(s):  
Measurement Techniques ◽  
High Heat ◽  
Direct Drive ◽  
Double Crystal ◽  
Relative Pitch ◽  
Double Crystal Monochromator ◽  
Synchrotron Beam ◽  
High Heat Load ◽  
Low Emittance

The requirement for vibrational stability of beamline optics continues to evolve rapidly to comply with the demands created by the improved brilliance of the third-generation low-emittance storage rings around the world. The challenge is to quantify the performance of the instrument before it is installed at the beamline. In this article, measurement techniques are presented that directly and accurately measure (i) the relative vibration between the two crystals of a double-crystal monochromator (DCM) and (ii) the absolute vibration of the second-crystal cage of a DCM. Excluding a synchrotron beam, the measurements are conducted underin situconditions, connected to a liquid-nitrogen cryocooler. The investigated DCM utilizes a direct-drive (no gearing) goniometer for the Bragg rotation. The main causes of the DCM vibration are found to be the servoing of the direct-drive goniometer and the flexibility in the crystal cage motion stages. It is found that the investigated DCM can offer relative pitch vibration down to 48 nrad RMS (capacitive sensors, 0–5 kHz bandwidth) and absolute pitch vibration down to 82 nrad RMS (laser interferometer, 0–50 kHz bandwidth), with the Bragg axis brake engaged.

In situ surface monitoring system for synchrotron mirrors under high heat load

1997 ◽  
Vol 36 (22) ◽  
pp. 5546 ◽  
Author(s):  
Peter H. Mui ◽  
George Srajer ◽  
Dennis M. Mills
Keyword(s):  
Monitoring System ◽  
Heat Load ◽  
High Heat ◽  
High Heat Load ◽  
Surface Monitoring

Advantages of in-situ LTP distortion profile test on high heat load mirrors and applications

1996 ◽  
Author(s):  
Shinan Qian ◽  
Werner H. Jark ◽  
Giovanni Sostero ◽  
Alessandro Gambitta ◽  
Fabio Mazzolini ◽  
...  
Keyword(s):  
Heat Load ◽  
High Heat ◽  
High Heat Load

Layered and Graded Coatings as Plasma Facing Materials for Fusion in LSCPM

2008 ◽  
Vol 368-372 ◽  
pp. 1795-1798
Author(s):  
Shu Xiang Song ◽  
Zhang Jian Zhou ◽  
Wei Zhi Yao ◽  
Wei Wei Cong ◽  
Chang Chun Ge
Keyword(s):  
Powder Metallurgy ◽  
Boron Carbide ◽  
Plasma Spraying ◽  
Thermal Performance ◽  
High Heat ◽  
Water Quenching ◽  
Particle Sizes ◽  
Graded Coatings ◽  
Heat Loading ◽  
Plasma Facing Materials

This paper reports some new progresses on layered and graded coatings for plasma facing materials in fusion devices in Laboratory of Special Ceramics and Powder Metallurgy (LSCPM), University of Science and Technology Beijing (USTB), China. They included tungsten coatings made be various particle sizes of initial feedstock and interlayers and boron carbide graded coatings. All the coatings were fabricated on the oxygen free copper by plasma spraying. The microstructures and properties were investigated for PFM. Water quenching and high heat loading experiments were also carried out to estimate the thermal performance of these coatings.

Charged particle emission from plasma facing materials by high heat load

1992 ◽  
Vol 196-198 ◽  
pp. 1008-1012 ◽  
Author(s):  
K. Tokunaga ◽  
T. Fujiwara ◽  
S. Fukuda ◽  
T. Muroga ◽  
N. Yoshida
Keyword(s):  
Charged Particle ◽  
Heat Load ◽  
High Heat ◽  
Particle Emission ◽  
High Heat Load ◽  
Plasma Facing Materials ◽  
Charged Particle Emission
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