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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

  • 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.
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    [1] . Donald H. Bilderback, Andreas K. Freund, Gordon S.Knapp et al. J. Synchrotron Rad., 2000, 7: 53-602. ZHANG Lin, Lee Wah-Keat. J. Synchrotron Rad., 2003,10: 313-3193. Lee Wah-Keat, Kamel Fezzaa, Patricia Fernandez et al. J.Synchrotron Rad., 2001, 8: 22-254. ZHANG Lin. Proc. SPIE 1993. 1997, 223-2355. WANG Na-Xiu et al. Nuclear Technique, 2002, 25(6):401-407(in Chinese)(王纳秀等.核技术,2002,25(6):401—407)

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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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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.

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