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Specifications:

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• Maximum beam size: 15 mm width x 50 mm height
• Collimation:
  • 60', 15' or 7' before monochromator
  • 20' before sample [30' for Ge(733)]
  • 7' before detectors
• Monochromators:
  

  Monochromator	in-pile Collimation (arcmin)	Monochr. 2Theta	Relative Bragg Intensities	Flux (n s-1cm-2)	Wavelength (Å)	Relative # of reflections
  Ge(311)	60'	75o	5.78	1,160,000	2.079	50
  Ge(311)	15'	75o	2.86	570,000	2.079	50
  Ge(311)	7'	75o	1.44	290,000	2.079	50
  Cu(311)	60'	90o	1.84	870,000	1.540	100
  Cu(311)	15'	90o	1.00	440,000	1.540	100
  Cu(311)	7'	90o	0.54	230,000	1.540	100
  Ge(733)	60'	120o	0.31	330,000	1.197	200
  Ge(733)	15'	120o	0.20	200,000	1.197	200
  Ge(733)	7'	120o	0.11	120,000	1.197	200

• Detectors:
  
  • 32 He-3 detectors at 5^o intervals
  • 13 degree scan range covering 2Theta from 0^o to 167^o
• Sample Environment:
  
  • temperature from 0.3 K to 2000 K
  • vertical magnetic fields
• Sample Can Size:
  
  • Vanadium sample cans are used and can be sealed using various thickness' of either Indium or Lead wire. Sample can sizes and volumes are detailed in the table below:

  Size	I.D. (mm)	Length (mm)	Volume (c.c.)
  A	6.0	50.0	1.5
  B	9.2	50.0	4.0
  C	10.8	50.0	5.5
  D	12.4	50.0	8.0
  E	15.6	50.0	11.5

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  Related Links:

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  • Layout of the BT-1 Instrument.
  • BT-1 resolution as FWHM(2theta) vs 2theta or FWHM(Q) vs Q(Å^-1).
  • Sample Requirements and Safety Considerations
  • View Sample BT-1 Data for Each Monochromator and Collimation Setting
  • What to include when publishing BT-1 results
  • Request time on BT-1
  • Current BT-1 schedule
  • Available Furnace Options at the NCNR
    
  • Available Refrigerator Options at the NCNR
    
  • Available Magnet Options at the NCNR
    
  • Contact a BT-1 Scientist

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  Additional Links:
  
  
  NCNR Home Page.
  NCNR Sample Environment Page.
  Safety Guidelines for Working at the NCNR
  
  
  
  Last modified 11-December-2012 by website owner: NCNR (attn: )