Design challenges and performance of nested neutron mirrors for microfocusing on SNAP

Gene E. Ice; Judy W.L. Pang; Chris Tulk; Jamie Molaison; Jae Young Choi; Cody Vaughn; Lauren Lytle; Peter Z. Takacs; Ken H. Andersen; Terry Bigault; Ali Khounsary

doi:10.1107/S0021889809037595

Design challenges and performance of nested neutron mirrors for microfocusing on SNAP

Gene E. Ice, Judy W.L. Pang, Chris Tulk, Jamie Molaison, Jae Young Choi, Cody Vaughn, Lauren Lytle, Peter Z. Takacs, Ken H. Andersen, Terry Bigault, Ali Khounsary

Research output: Contribution to journal › Article › peer-review

23 Scopus citations

Abstract

Kirkpatrick-Baez (KB) neutron supermirrors can efficiently focus poly-chromatic neutron beams to micrometre dimensions. The ultimate size is determined mainly by the perfection of the mirrors and by the size of the beam needed to have sufficient experimental signal. Nested or Montel KB mirrors can collect 2.6 times more beam than standard sequential KB optics, but require good figure perfection at the edge of one mirror. This paper describes the characterization of the figure errors over the important reflective portions of the two mirrors needed for a Montel focusing pair. The measurements are placed in context with theoretical predictions and are used to predict mirror focusing performance. Strategies to improve on the focusing of this class of optics are suggested and early results from these mirrors installed on the Spallation Neutrons at Pressure (SNAP) Beamline 3 at the Spallation Neutron Source (SNS) at Oak Ridge are presented.

Original language	English
Pages (from-to)	1004-1008
Number of pages	5
Journal	Journal of Applied Crystallography
Volume	42
Issue number	6
DOIs	https://doi.org/10.1107/S0021889809037595
State	Published - 2009
Externally published	Yes

Keywords

Focusing performance
Nested mirrors
Neutron supermirrors
Spallation neutrons

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title = "Design challenges and performance of nested neutron mirrors for microfocusing on SNAP",

abstract = "Kirkpatrick-Baez (KB) neutron supermirrors can efficiently focus poly-chromatic neutron beams to micrometre dimensions. The ultimate size is determined mainly by the perfection of the mirrors and by the size of the beam needed to have sufficient experimental signal. Nested or Montel KB mirrors can collect 2.6 times more beam than standard sequential KB optics, but require good figure perfection at the edge of one mirror. This paper describes the characterization of the figure errors over the important reflective portions of the two mirrors needed for a Montel focusing pair. The measurements are placed in context with theoretical predictions and are used to predict mirror focusing performance. Strategies to improve on the focusing of this class of optics are suggested and early results from these mirrors installed on the Spallation Neutrons at Pressure (SNAP) Beamline 3 at the Spallation Neutron Source (SNS) at Oak Ridge are presented.",

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author = "Ice, {Gene E.} and Pang, {Judy W.L.} and Chris Tulk and Jamie Molaison and Choi, {Jae Young} and Cody Vaughn and Lauren Lytle and Takacs, {Peter Z.} and Andersen, {Ken H.} and Terry Bigault and Ali Khounsary",

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language = "English",

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AU - Ice, Gene E.

AU - Pang, Judy W.L.

AU - Tulk, Chris

AU - Molaison, Jamie

AU - Choi, Jae Young

AU - Vaughn, Cody

AU - Lytle, Lauren

AU - Takacs, Peter Z.

AU - Andersen, Ken H.

AU - Bigault, Terry

AU - Khounsary, Ali

PY - 2009

Y1 - 2009

N2 - Kirkpatrick-Baez (KB) neutron supermirrors can efficiently focus poly-chromatic neutron beams to micrometre dimensions. The ultimate size is determined mainly by the perfection of the mirrors and by the size of the beam needed to have sufficient experimental signal. Nested or Montel KB mirrors can collect 2.6 times more beam than standard sequential KB optics, but require good figure perfection at the edge of one mirror. This paper describes the characterization of the figure errors over the important reflective portions of the two mirrors needed for a Montel focusing pair. The measurements are placed in context with theoretical predictions and are used to predict mirror focusing performance. Strategies to improve on the focusing of this class of optics are suggested and early results from these mirrors installed on the Spallation Neutrons at Pressure (SNAP) Beamline 3 at the Spallation Neutron Source (SNS) at Oak Ridge are presented.

AB - Kirkpatrick-Baez (KB) neutron supermirrors can efficiently focus poly-chromatic neutron beams to micrometre dimensions. The ultimate size is determined mainly by the perfection of the mirrors and by the size of the beam needed to have sufficient experimental signal. Nested or Montel KB mirrors can collect 2.6 times more beam than standard sequential KB optics, but require good figure perfection at the edge of one mirror. This paper describes the characterization of the figure errors over the important reflective portions of the two mirrors needed for a Montel focusing pair. The measurements are placed in context with theoretical predictions and are used to predict mirror focusing performance. Strategies to improve on the focusing of this class of optics are suggested and early results from these mirrors installed on the Spallation Neutrons at Pressure (SNAP) Beamline 3 at the Spallation Neutron Source (SNS) at Oak Ridge are presented.

KW - Focusing performance

KW - Nested mirrors

KW - Neutron supermirrors

KW - Spallation neutrons

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JF - Journal of Applied Crystallography

IS - 6

ER -

Design challenges and performance of nested neutron mirrors for microfocusing on SNAP

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Keywords

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