SwissNeutronics AG - Bruehlstrasse 28 - CH-5313 Klingnau - Switzerland - phone: +4156 245 02 02 - tech@swissneutronics.ch

2d focusing monochromators

The 2d focusing arrays are sophisticated mechanisms achieving high precision for the focusing. The crystal array is tilted in two directions to accomplish the 2-dimensional focusing. Each crystal is individually aligned. SwissNeutronics offers a standardized design with large flexibility to customize the device to the individual requirements.

Particular features are:

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High precision:

 

< ≈0.05° (RMS, absolute)

< ±0.02° (repeatability)

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Alignment provision for every individual crystal

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Design of mechanism with minimum material in the neutron beam

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Sintered B4C crystal platelets between crystals and crystal holders for low background

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Fully equipped with stepper motor, encoder/resolver, home/limit switches

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Combined with goniometer stage

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Additional features: shielding elements, integrated guide field, etc.

 

Downloads: Video doubly focusing monochromator

2d focusing monochromator - KOMPASS @ FRM-II (2012)

  • Monochromator array

     

    		Crystal:
    Crystal dimensions:
    Reflecting area:
    Number of rows:
    Number of columns:
    Gaps between rows:     		HOPG
    14 mm (w) x 14 mm (h) x 2.5 mm (t)
    275 mm (w) x 188 mm (h)
    13
    19
    0.5 mm
    Focusing features

     

    		Focusing direction:
    Focusing range vertical:
    Focusing range horizontal:
    Accuracy:
    Repeatability:     		2d (variable)
    flat -> Rv = 580 mm
    flat -> Rh = 1300 mm
    < 0.05° RMS (measured)
    < ±0.01° (measured)
    Actuation components

     

    		Motor:
    Rotary encoder:
    Switches:     		2 stepper motor
    2 magnetic multiturn encoder
    4 limit switches
    Specials

     

    		B4C platelets between crystal and crystal holder (t = 1 mm)
    Integrated magnetic guide field

2d focusing analyzer - KOMPASS @ FRM-II (2012)

  • Monochromator array

     

    		Crystal:
    Crystal dimensions:
    Reflecting area:
    Number of rows:
    Number of columns:
    Gaps between rows:     		HOPG
    10 mm (w) x 20 mm (h) x 2 mm (t)
    221.5 mm (w) x 230 mm (h)
    11
    21
    0.5 mm
    Focusing features

     

    		Focusing directions:
    Focusing range vertical:
    Focusing range horizontal:
    Accuracy:
    Repeatability:     		2d (variable)
    flat -> Rv = 600 mm
    flat -> Rh = 600 mm
    < 0.05° RMS (measured)
    < ±0.01° (measured)
    Actuation components

     

    		Motor:
    Rotary motor:
    Switches:     		2 stepper motor
    2 magnetic multiturn encoder
    4 limit switches
    Specials

     

    		Integrated magnetic guide field

2d focusing monochromator - FLEX @ HZB (2011)

  • Monochromator array

     

    		Crystal:
    Crystal dimensions:
    Reflecting area:
    Number of rows:
    Number of columns:
    Gaps between rows:    		HOPG
    20 mm (w) x 20 mm (h) x 2 mm (t)
    307 mm (w) x 144.5 mm (h)
    7
    15
    0.5 mm
    Focusing features

     

    		Focusing direction:
    Focusing range vertical:
    Focusing range horizontal:
    Accuracy:
    Repeatability:     		2d (variable)
    flat -> Rv = 700 mm
    flat -> Rh = 1500 mm
    < 0.05° RMS (measured)
    < ±0.01° (measured)
    Actuation components

     

    		Motor:
    Rotary encoder:
    Switches:     		2 stepper motor
    2 magnetic multiturn encoder
    4 limit switches
    Specials

     

    		Including rotation and tilt stage

2d focusing Si monochromator - CARR (2013)

  • Monochromator array

     

    		Crystal:
    Crystal dimensions:


    Reflecting area:
    Number of rows:
    Number of columns:
    Gaps between rows:     		Si (311)
    285 mm (w) x 38.5 mm (h) x6 mm (t)
    stacked from 10 Si wafer with
    t = 0.6 mm
    270 mm (w) x 200 mm (h)
    5
    1
    0.5 mm
    Focusing features

     

    		Focusing direction:
    Focusing range vertical:
    Focusing range horizontal:
    Accuracy:
    Repeatability:     		2d (hor. variable, vert. fixed)
    Rv = 1667 mm
    1800 mm < Rh < 5500 mm
    < 0.1° RMS (measured)
    < ±0.03° (measured)
    Actuation components

     

    		Motor:
    Rotary encoder:
    Switches:    		1 stepper motor
    1 magnetic multiturn encoder
    2 limit switches
    Specials

     

    		Including rotation and tilt stage

2d vertical focusing monochromators - IN4 @ ILL (2009)

  • Monochromator array

     

    		Crystal:
    Crystal dimensions:
    Reflecting area:
    Number of rows:
    Number of columns:
    Gaps between rows:     		PG (002), Cu (220), Cu (111)
    20 mm (w) x 40 mm (h) x 2/6 mm (t)
    230 mm (w) x 204 mm (h)
    1
    11
    1 mm
    Focusing features

     

    		Focusing direction:
    Focusing range vertical:
    Focusing range horizontal:
    Accuracy:
    Repeatability:     		2d (hor. variable, vert. fixed)
    Rv = 1270 mm
    flat -> Rh = 2000 mm
    0.03° RMS (measured)
    < ±0.01° (measured)
    Actuation components

     

    		Motor:
    Rotary encoder:
    Switches:     		stepper motor
    resolver
    2 limit switches, 1 home switch

     

    Specials

     

    		Base plate for a rotary changer system incl. absorbing elements (borated aluminium) between monochromators