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

1d focusing monochromators

The 1d focusing of the monochromator is accomplished by tilting rows (vertical) or columns (horizontal) of the crystal holder. 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:

 

< ≈0,010° (RMS, absolute)

< ±0,005° (repeatability)

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Design of frame without interference with neutron beam

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Miss-cut Si crystal holders for high transparency, e.g. application at intermediate positions of a neutron guide

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Sintered B4C 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 focusing monochromator

1d vertical focusing monochromator - CARR (2016)

  • Monochromator array

     

    		Crystal:
    Crystal dimensions:
    Reflecting area:
    Number of rows:
    Number of columns:
    Gap between rows:    		HOPG
    32 mm (w) x 22 mm (h) x 2 mm (t)
    105 mm (w) x 157mm (h)
    7
    1 (3 HOPG per row)
    0.4 mm
    Focusing features

     

    		Focusing direction:
    Focusing range:
    Accuracy:
    Repeatability:    		vertical (variable)
    flat -> Rv = 500 mm
    < 0.015° RMS (measured)
    < ±0.005° (measured)
    Actuation components

     

    		Motor:
    Rotary encoder:
    Switches:    		stepper motor
    absolute encoder
    2 limit switches

     

    Specials
     Crystal holder made from single crystal Si
    HOPG Crystals soldered to holder

Focusing monochromator/analyser - CARR (2016)

  • Monochromator array - vertical focusing

     

    		Crystal:
    Crystal dimensions:
    Reflecting area:
    Number of rows:
    Number of columns:
    Gap between rows:    		HOPG
    35 mm (w) x 22 mm (h) x 2 mm (t)
    105 mm (w) x 160mm (h)
    7
    1 (3 HOPG per row)
    0.4 mm
    Focusing features of monochromators array

     

    		Focusing direction:
    Focusing range:
    Accuracy:
    Repeatability:    		vertical (variable)
    flat -> Rv = 500 mm
    < 0.009° RMS (measured)
    < ±0.005° (measured)
    Analyser array - variable horizontal & fixed vertical focusing

     

    		Crystal:
    Crystal dimensions:
    Reflecting area:
    Number of rows:
    Number of columns:
    Gaps between rows:    		HOPG
    17 mm (w) x 22 mm (h) x 2 mm (t)
    155 mm (w) x 154 mm (h)
    1 (7 HOPG per row)
    90.4 mm
    Focusing features of analyser array

     

    		Focusing direction:
    Horizontal focusing range:
    Vertical focusing:
    Accuracy:
    Repeatability:    		horizontal (variable) & vertical (fixed)
    flat-> Rv = 500 mm
    Rv = 950 mm
    < 0.016° RMS (measured)
    < ±0.005° (measured)
    Actuation components

     

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

     

    Specials
     Crystal holder of monochromators made from sintered B4C single crystal Si
    Titanium screws for fixation of crystals
    Magnetic yoke with permanent magnets integrated into frame of monochromators

1d vertical focusing monochromator - TriCS @ PSI (2013)

  • Monochromator array

     

    		Crystal:
    Crystal dimensions:
    Reflecting area:
    Number of rows:
    Number of columns:
    Gaps between rows:    		HOPG
    65 mm (w) x 11.2 mm (h) x 1.5 mm (t)
    65 mm (w) x 127 mm (h)
    1
    11
    0.4 mm
    Focusing features

     

    		Focusing direction:
    Focusing range:
    Accuracy:
    Repeatability:    		vertical (variable)
    flat -> Rv = 1000 mm
    0.006° RMS (measured)
    < ±0.005° (measured)
    Actuation components

     

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

     

    		Crystal holder made from single crystal Si
    Titanium screws for fixation of crystals

1d vertical focusing monochromator - DIANE @ LLB (2013)

  • Monochromator array

     

    		Crystal:
    Crystal dimensions:
    Reflecting area:
    Number of rows:
    Number of columns:
    Gaps between rows:    		HOPG
    75 mm (w) x 12 mm (h) x 2 mm (t)
    75 mm (w) x 137 mm (h)
    1
    11
    0.4 mm
    Focusing features

     

    		Focusing direction:
    Focusing range:
    Accuracy:
    Repeatability:    		vertical (variable)
    flat -> Rv = 500 mm
    0.010° RMS (measured)
    < ±0.005° (measured)
    Actuation components

     

    		Motor:
    Rotary encoder:
    Switches:
    Goniometer:    		stepper motor
    resolver
    2 limit switch
    1 rotation and 1 tilt stage
    Specials

     

    		Crystal holder made from single crystal Si
    Titanium screws for fixation of crystals
    Asymmetric design to make it fit into the gap in the neutron guide

1d focusing Cu monochromator - Mumbai (2007)

  • Monochromator array

     

    		Crystal:
    Crystal dimensions:
    Reflecting area:
    Number of rows:
    Number of columns:
    Gaps between rows:    		Cu (220)
    60 mm (w) x 10 mm (h) x 10 mm (t)
    60 (w) x 136.6 mm (h)
    1
    13
    0.55 mm
    Focusing features

     

    		Focusing direction:
    Focusing range vertical:
    Accuracy:
    Repeatability:     		vertical (variable) 1000 mm
    < Rh < ∞
    0.05° RMS (measured)
    < ± 0.01° (measured)
    Actuation components

     

    		Motor:
    Rotary encoder:
    Switches:
    Goniometer:    		stepper motor
    encoder
    2 limit switches
    1 rotation and 1 tilt stage

     

    Specials

     

    		Crystal orientation provides also monochromatization of transmitted beam