NB3-EQ-30-0001-R00.pdf

NB3-EQ-30-0001-R00

NB-3 Bio-SANS & Standby

Neutron Velocity Selector Systems

Equipment Specification

Author(s):

Bill McHargue

Date Published:

April 2026

Prepared by

OAK RIDGE NATIONAL LABORATORY

Oak Ridge, TN 37831-6283 managed by

UT-BATTELLE, LLC

for the

US DEPARTMENT OF ENERGY

under contract DE-AC05-00OR22725

This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof.

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CONTENTS

1. APPROVALS

2. INTRODUCTION

3. SCOPE OF WORK

4. NEUTRONIC REQUIREMENTS

1. APPROVALS

Rev 00 Rev 01 Rev 02 Rev 03

Approvals Neutron Scattering Division

LV3 Scientist NSD Group Lead LV3 Scientist NSD Group Lead NSD Section Head NSD Division Director

Neutron Technologies Division Instrument Engineering Group Lead

Neutron Technologies Engineering Section Head

HBRR Project Controls

HBRR Project Manager HBRR Science Lead

Technical Concurrence

LV3 Engineer LV2 Engineer Neutronics SME Neutron Chopper/VS SME

Revision Description of Changes

00 Initial Release per NB3-DCN-00-0001

5:04 pm 27-Apr-2026

R. AARON HANKS | HANKSRA@ORNL.GOV

10:34 am 21-Apr-2026

IAN TURNBULL | TURNBULLIS@ORNL.GOV

3:43 pm 27-Apr-2026

MATTHIA D. FRONTZEK | FRONTZEKMD@ORNL.GOV

3:35 pm 27-Apr-2026

VOLKER S. URBAN | URBANVS@ORNL.GOV

12:50 pm 21-Apr-2026

MARK S. LYTTLE | LYTTLEMS@ORNL.GOV

10:47 am 21-Apr-2026

WILLIAM T. HELLER | HELLERWT@ORNL.GOV

10:42 am 21-Apr-2026

LISA DEBEER-SCHMITT | DEBEERSCHMITTLM@ORNL.GOV

5:50 pm 28-Apr-2026

AMY JONES | BLACKA@ORNL.GOV

1:39 pm 23-Apr-2026

WILLIAM MCHARGUE | MCHARGUEWM@ORNL.GOV

10:24 am 29-Apr-2026

THOMAS HUEGLE | HUEGLET@ORNL.GOV

1:39 am 30-Apr-2026

MARK CHAMPION | CHAMPIONMS@ORNL.GOV

12:43 pm 30-Apr-2026

MARK D. LUMSDEN | LUMSDENMD@ORNL.GOV

12:59 pm 30-Apr-2026

SAI VENKATESH PINGALI | PINGALIS@ORNL.GOV

1:26 pm 03-May-2026

HUGH O'NEILL | ONEILLHM@ORNL.GOV

2. INTRODUCTION

Two velocity selector systems shall be manufactured for use at the High Flux Isotope Reactor (HFIR) at the Department of Energy’s Oak Ridge National Laboratory (ORNL) in Oak Ridge, Tennessee, USA.

The first one for the Biological Small-Angle Neutron Scattering instrument (Bio-SANS) and a second, Standby velocity selector system.

The Bio-SANS instrument provides unique insights into the structure of biological systems across multiple scales of length. This includes the nano- to mesoscale structure and dynamics of functional complexes and hierarchical assemblies within a cell. The scientific challenges span from fundamental mechanistic studies of biomolecular function to complex hierarchical materials and in-cellulo systems.

3. SCOPE OF WORK

This equipment specification establishes the neutronic requirements for the Bio-SANS and the Standby neutron velocity selector systems, hereafter referred to as “velocity selectors”.

The velocity selectors include mechanical components that interact with the neutron beam, as well as the electrical control system required for operation. The Seller shall manufacture, inspect, assemble, balance, helium leak test, package, and ship the velocity selectors in accordance with all requirements in the statement of work XGH-SW-30-0001.

4. NEUTRONIC REQUIREMENTS

The neutronics requirements of the velocity selectors are as follows:

− Wavelength:

o 4 Å ≤ λ ≤ 20 Å without operating in any resonance speed of the velocity selector − Beam divergence (value at FWHM):

o Vertical 0.46° o Horizontal 0.46°

− Based on beam divergence, the Δλ/λ or resolution (value at FWHM):

o +5° Tilt 7% (but can accept 10%) o 0° Tilt 10% (but can accept 11%) o -5° Tilt 20% (but can accept 15%)

− Peak transmission through velocity selector (including area loss and divergence loss):

o 0° Tilt 80% o ±5° Tilt 70%

− Transmission of a fully stopped velocity selector rotor at 2.3 Å wavelength neutrons:

o < 5.0x10⁻⁴ %

The neutron beam windows shall be located at the three o’clock position on the velocity selector housing endplates when looking from the reactor towards the detectors.

The neutron beam windows shall have a minimum aperture of 45 mm both horizontal and vertical to accommodate a 40 mm square neutron beam.

If tilt stages are required to achieve the neutronic requirements listed for these velocity selectors, the tilt stages shall be listed as separate, unique line items in the quotation.

If new lamellae molds are required for fabrication of these velocity selectors to achieve the neutronic requirements listed, the lamellae molds shall be listed as separate, unique line items in the quotation.