Simulation of Thermal Distortion of DCM Crystal Indirectly Cooled by LN<SUB>2</SUB>

WANG Na-Xiu; ZHU Yi; FU Yuan

Chinese Physics C> 2006, Vol. 30> Issue(8) : 802-805

Simulation of Thermal Distortion of DCM Crystal Indirectly Cooled by LN₂

Shanghai Institute of Applied Physics, CAS, Shanghai 201800, China

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Abstract：
The simulation result of thermal distortion of DCM crystal indirectly cooled by liquid nitrogen(LN₂) at Shanghai synchrotron radiation facility (SSRF) has been reported. The source is U27 undulator. The maximum of power density at 24m is 60W/mm². We give the correlation of the slope error of crystal surface vs. Bragg angle, the convection film coefficient, the bulk temperature of LN₂ and total power absorbed by the first crystal, respectively. The slope error is less than 3 arcsec when the Bragg angle is less than 30°, the thickness of crystal is larger than 30mm, the current of storage ring is up to 400mA and cooled by 78K LN₂.

References

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WANG Na-Xiu, ZHU Yi and FU Yuan. Simulation of Thermal Distortion of DCM Crystal Indirectly Cooled by LN₂[J]. Chinese Physics C, 2006, 30(8): 802-805.

WANG Na-Xiu, ZHU Yi and FU Yuan. Simulation of Thermal Distortion of DCM Crystal Indirectly Cooled by LN₂[J]. Chinese Physics C, 2006, 30(8): 802-805. shu

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Received: 2005-06-29
Revised: 2006-03-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Simulation of Thermal Distortion of DCM Crystal Indirectly Cooled by LN₂

Corresponding author: WANG Na-Xiu,

Shanghai Institute of Applied Physics, CAS, Shanghai 201800, China

Received Date: 2005-06-29
Accepted Date: 2006-03-01
Available Online: 2006-08-05

Abstract: The simulation result of thermal distortion of DCM crystal indirectly cooled by liquid nitrogen(LN₂) at Shanghai synchrotron radiation facility (SSRF) has been reported. The source is U27 undulator. The maximum of power density at 24m is 60W/mm². We give the correlation of the slope error of crystal surface vs. Bragg angle, the convection film coefficient, the bulk temperature of LN₂ and total power absorbed by the first crystal, respectively. The slope error is less than 3 arcsec when the Bragg angle is less than 30°, the thickness of crystal is larger than 30mm, the current of storage ring is up to 400mA and cooled by 78K LN₂.