![](media/image1.png){width="6.785416666666666in"
height="8.36736111111111in"}

**SNS INSTRUMENTS**

**NEXT GENERATION -- (SING)**

**Bandwidth Limiting Disk Chopper Specification\
**

**HYSPEC Highly Oriented\
Pyrolitic Graphite Crystals\
**

**Document Number**

**SING14B-20-EQ0008-R00A**

#  {#section .unnumbered}

  -----------------------------------------------------------------------
  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.

  -----------------------------------------------------------------------

SNS SING14B-20-EQ0008-R00A

**SNS INSTRUMENTS**

**NEXT GENERATION (SING)**

**HYSPEC Highly Oriented Pyrolitic Graphite Crystals**

Date Published: August 2006

Prepared by

OAK RIDGE NATIONAL LABORATORY

P.O. Box 2008

Oak Ridge, Tennessee 37831-6285

managed by

UT-Battelle, LLC

for the

U.S. DEPARTMENT OF ENERGY

Office of Science

Basic Energy Science

under contract DE-AC05-00OR22725

+-----------+----------+---+------------+---------+---+---------+-----------+
| Spec      |          |   |            |         | I |         |           |
| ification |          |   |            |         | s |         |           |
| for       |          |   |            |         | s |         |           |
|           |          |   |            |         | u |         |           |
|           |          |   |            |         | e |         |           |
|           |          |   |            |         | D |         |           |
|           |          |   |            |         | a |         |           |
|           |          |   |            |         | t |         |           |
|           |          |   |            |         | e |         |           |
+-----------+----------+---+------------+---------+---+---------+-----------+
| HYSPEC    |          |   |            |         | 0 |         |           |
| HOPG      |          |   |            |         | 8 |         |           |
| FOCUSING  |          |   |            |         | / |         |           |
| CRYSTALS  |          |   |            |         | 1 |         |           |
|           |          |   |            |         | 0 |         |           |
|           |          |   |            |         | / |         |           |
|           |          |   |            |         | 0 |         |           |
|           |          |   |            |         | 6 |         |           |
+-----------+----------+---+------------+---------+---+---------+-----------+
| L         |          |   | Division / |         | S |         |           |
| aboratory |          |   | Group      |         | p |         |           |
|           |          |   |            |         | e |         |           |
|           |          |   |            |         | c |         |           |
|           |          |   |            |         | i |         |           |
|           |          |   |            |         | f |         |           |
|           |          |   |            |         | i |         |           |
|           |          |   |            |         | c |         |           |
|           |          |   |            |         | a |         |           |
|           |          |   |            |         | t |         |           |
|           |          |   |            |         | i |         |           |
|           |          |   |            |         | o |         |           |
|           |          |   |            |         | n |         |           |
|           |          |   |            |         | N |         |           |
|           |          |   |            |         | o |         |           |
+-----------+----------+---+------------+---------+---+---------+-----------+
| ORNL      |          |   | Ex         |         | S |         |           |
|           |          |   | perimental |         | I |         |           |
|           |          |   | Facilities |         | N |         |           |
|           |          |   | /          |         | G |         |           |
|           |          |   | Instrument |         | 1 |         |           |
|           |          |   | Systems    |         | 4 |         |           |
|           |          |   |            |         | B |         |           |
|           |          |   |            |         | - |         |           |
|           |          |   |            |         | 2 |         |           |
|           |          |   |            |         | 0 |         |           |
|           |          |   |            |         | - |         |           |
|           |          |   |            |         | E |         |           |
|           |          |   |            |         | Q |         |           |
|           |          |   |            |         | 0 |         |           |
|           |          |   |            |         | 0 |         |           |
|           |          |   |            |         | 0 |         |           |
|           |          |   |            |         | 8 |         |           |
|           |          |   |            |         | - |         |           |
|           |          |   |            |         | R |         |           |
|           |          |   |            |         | 0 |         |           |
|           |          |   |            |         | 0 |         |           |
|           |          |   |            |         | A |         |           |
+-----------+----------+---+------------+---------+---+---------+-----------+
| Prepared  |          |   | Level IV   |         | L |         |           |
| by        |          |   | Manager    |         | e |         |           |
|           |          |   |            |         | a |         |           |
|           |          |   |            |         | d |         |           |
|           |          |   |            |         | E |         |           |
|           |          |   |            |         | n |         |           |
|           |          |   |            |         | g |         |           |
|           |          |   |            |         | i |         |           |
|           |          |   |            |         | n |         |           |
|           |          |   |            |         | e |         |           |
|           |          |   |            |         | e |         |           |
|           |          |   |            |         | r |         |           |
+-----------+----------+---+------------+---------+---+---------+-----------+
| M.E.      |          |   |            |         | D |         |           |
| Hagen     |          |   |            |         | . |         |           |
|           |          |   |            |         | M |         |           |
|           |          |   |            |         | . |         |           |
|           |          |   |            |         | W |         |           |
|           |          |   |            |         | i |         |           |
|           |          |   |            |         | l |         |           |
|           |          |   |            |         | l |         |           |
|           |          |   |            |         | i |         |           |
|           |          |   |            |         | a |         |           |
|           |          |   |            |         | m |         |           |
|           |          |   |            |         | s |         |           |
+-----------+----------+---+------------+---------+---+---------+-----------+
| Other WBS |          |   |            |         |   |         |           |
| elements  |          |   |            |         |   |         |           |
| affected  |          |   |            |         |   |         |           |
+-----------+----------+---+------------+---------+---+---------+-----------+
|           |          |   |            |         |   |         |           |
+-----------+----------+---+------------+---------+---+---------+-----------+
|           |          | S |            |         |   |         |           |
|           |          | i |            |         |   |         |           |
|           |          | g |            |         |   |         |           |
|           |          | n |            |         |   |         |           |
|           |          | a |            |         |   |         |           |
|           |          | t |            |         |   |         |           |
|           |          | u |            |         |   |         |           |
|           |          | r |            |         |   |         |           |
|           |          | e |            |         |   |         |           |
|           |          | / |            |         |   |         |           |
|           |          | D |            |         |   |         |           |
|           |          | a |            |         |   |         |           |
|           |          | t |            |         |   |         |           |
|           |          | e |            |         |   |         |           |
+-----------+----------+---+------------+---------+---+---------+-----------+
|           |          | R |            | Rev 1   |   | Rev 2   | Rev 3     |
|           |          | e |            |         |   |         |           |
|           |          | v |            |         |   |         |           |
|           |          | 0 |            |         |   |         |           |
+-----------+----------+---+------------+---------+---+---------+-----------+
| Prepared  |          | M |            |         |   |         |           |
| by:       |          | . |            |         |   |         |           |
|           |          | E |            |         |   |         |           |
|           |          | . |            |         |   |         |           |
|           |          | H |            |         |   |         |           |
|           |          | a |            |         |   |         |           |
|           |          | g |            |         |   |         |           |
|           |          | e |            |         |   |         |           |
|           |          | n |            |         |   |         |           |
+-----------+----------+---+------------+---------+---+---------+-----------+
|           |          |   |            |         |   |         |           |
+-----------+----------+---+------------+---------+---+---------+-----------+
| Level IV  |          |   |            |         |   |         |           |
| Manager:  |          |   |            |         |   |         |           |
+-----------+----------+---+------------+---------+---+---------+-----------+
|           |          |   |            |         |   |         |           |
+-----------+----------+---+------------+---------+---+---------+-----------+
| Lead      |          | W |            |         |   |         |           |
| Engineer  |          | . |            |         |   |         |           |
|           |          | J |            |         |   |         |           |
|           |          | . |            |         |   |         |           |
|           |          | L |            |         |   |         |           |
|           |          | e |            |         |   |         |           |
|           |          | o |            |         |   |         |           |
|           |          | n |            |         |   |         |           |
|           |          | h |            |         |   |         |           |
|           |          | a |            |         |   |         |           |
|           |          | r |            |         |   |         |           |
|           |          | d |            |         |   |         |           |
|           |          | t |            |         |   |         |           |
+-----------+----------+---+------------+---------+---+---------+-----------+
|           |          |   |            |         |   |         |           |
+-----------+----------+---+------------+---------+---+---------+-----------+
| En        |          | D |            |         |   |         |           |
| gineering |          | . |            |         |   |         |           |
| Manager:  |          | M |            |         |   |         |           |
|           |          | W |            |         |   |         |           |
|           |          | i |            |         |   |         |           |
|           |          | l |            |         |   |         |           |
|           |          | l |            |         |   |         |           |
|           |          | i |            |         |   |         |           |
|           |          | a |            |         |   |         |           |
|           |          | m |            |         |   |         |           |
|           |          | s |            |         |   |         |           |
+-----------+----------+---+------------+---------+---+---------+-----------+
|           |          |   |            |         |   |         |           |
+-----------+----------+---+------------+---------+---+---------+-----------+
| Senior    |          |   |            |         |   |         |           |
| Team      |          |   |            |         |   |         |           |
| Leader:   |          |   |            |         |   |         |           |
|           |          |   |            |         |   |         |           |
| (if       |          |   |            |         |   |         |           |
| required) |          |   |            |         |   |         |           |
+-----------+----------+---+------------+---------+---+---------+-----------+
| QA        |          | M |            |         |   |         |           |
| Repres    |          | . |            |         |   |         |           |
| entative: |          | L |            |         |   |         |           |
|           |          | . |            |         |   |         |           |
|           |          | G |            |         |   |         |           |
|           |          | i |            |         |   |         |           |
|           |          | l |            |         |   |         |           |
|           |          | d |            |         |   |         |           |
|           |          | n |            |         |   |         |           |
|           |          | e |            |         |   |         |           |
|           |          | r |            |         |   |         |           |
+-----------+----------+---+------------+---------+---+---------+-----------+
| Other     |          |   |            |         |   |         |           |
| approvals |          |   |            |         |   |         |           |
| as        |          |   |            |         |   |         |           |
| required: |          |   |            |         |   |         |           |
+-----------+----------+---+------------+---------+---+---------+-----------+
| Rev No    | Revision |   |            |         |   |         |           |
|           | Des      |   |            |         |   |         |           |
|           | cription |   |            |         |   |         |           |
+-----------+----------+---+------------+---------+---+---------+-----------+
| R00       | Original |   |            |         |   |         |           |
|           | Issue    |   |            |         |   |         |           |
+-----------+----------+---+------------+---------+---+---------+-----------+
|           |          |   |            |         |   |         |           |
+-----------+----------+---+------------+---------+---+---------+-----------+
|           |          |   |            |         |   |         |           |
+-----------+----------+---+------------+---------+---+---------+-----------+
|           |          |   |            |         |   |         |           |
+-----------+----------+---+------------+---------+---+---------+-----------+

TABLE OF CONTENTS

[1 Scope 6](#scope)

[2 Introduction 6](#introduction)

[3 Technical Requirements 7](#technical-requirements)

# Scope

# This specification defines the requirements for crystals of High Oriented Pyrolitic Graphite (HOPG) to be used in a focusing crystal array on the HYSPEC beamline at the Spallation Neutron Source facility (SNS) at Oak Ridge National Laboratory (ORNL).  {#this-specification-defines-the-requirements-for-crystals-of-high-oriented-pyrolitic-graphite-hopg-to-be-used-in-a-focusing-crystal-array-on-the-hyspec-beamline-at-the-spallation-neutron-source-facility-sns-at-oak-ridge-national-laboratory-ornl. .unnumbered}

# Buyer shall be defined in the solicitation and the equipment specified herein shall be delivered to the Buyer at the Spallation Neutron Source facility (SNS) of the Oak Ridge National Laboratory (ORNL) under the U.S. Department of Energy (DOE). Seller shall refer to all parties responsible for providing the HOPG crystals. {#buyer-shall-be-defined-in-the-solicitation-and-the-equipment-specified-herein-shall-be-delivered-to-the-buyer-at-the-spallation-neutron-source-facility-sns-of-the-oak-ridge-national-laboratory-ornl-under-the-u.s.-department-of-energy-doe.-seller-shall-refer-to-all-parties-responsible-for-providing-the-hopg-crystals. .unnumbered}

# Introduction

# The SNS facility, being constructed in Oak Ridge, Tennessee, is a new neutron scattering facility with a powerful, pulsed neutron source. From the target or core of the facility, neutrons will be guided to various instruments via mirrored neutron guides creating a "neutron beam". Along these guides, various neutron choppers will be inserted to filter neutrons of a desired velocity or wavelength. {#the-sns-facility-being-constructed-in-oak-ridge-tennessee-is-a-new-neutron-scattering-facility-with-a-powerful-pulsed-neutron-source.-from-the-target-or-core-of-the-facility-neutrons-will-be-guided-to-various-instruments-via-mirrored-neutron-guides-creating-a-neutron-beam.-along-these-guides-various-neutron-choppers-will-be-inserted-to-filter-neutrons-of-a-desired-velocity-or-wavelength. .unnumbered}

# This specification refers to the HYSPEC instrument, which is located on beamline 14B at the SNS. In Figure 1 a schematic rendering of beamline 14B is shown. The neutron beam is carried from the SNS moderator out to an external building via a curved neutron guide and passes through 4 beam defining choppers. In the external building the beam enters a drum shield that contains a focusing array of HOPG crystals that will be used to focus the beam onto the sample. This specification sets out the requirements for the HOPG crystals in this array. {#this-specification-refers-to-the-hyspec-instrument-which-is-located-on-beamline-14b-at-the-sns.-in-figure-1-a-schematic-rendering-of-beamline-14b-is-shown.-the-neutron-beam-is-carried-from-the-sns-moderator-out-to-an-external-building-via-a-curved-neutron-guide-and-passes-through-4-beam-defining-choppers.-in-the-external-building-the-beam-enters-a-drum-shield-that-contains-a-focusing-array-of-hopg-crystals-that-will-be-used-to-focus-the-beam-onto-the-sample.-this-specification-sets-out-the-requirements-for-the-hopg-crystals-in-this-array. .unnumbered}

#  {#section-1 .unnumbered}

  -----------------------------------------------------------------------
  ![](media/image2.png){width="6.5in" height="3.517322834645669in"}

  Figure 1: A 3-d rendering of the HYSPEC beamline from the Pro-E model.
  -----------------------------------------------------------------------

# It should be noted that this specification only covers the crystals and that the focusing array mechanism is not part of this specification. {#it-should-be-noted-that-this-specification-only-covers-the-crystals-and-that-the-focusing-array-mechanism-is-not-part-of-this-specification. .unnumbered}

# Technical Requirements

# The crystals required are of a flat plate shape as illustrated in Figure 2. The length (L), height (H) and thickness (T), as defined in Figure 2 for the crystals required along with the appropriate tolerances are given in Table 1. {#the-crystals-required-are-of-a-flat-plate-shape-as-illustrated-in-figure-2.-the-length-l-height-h-and-thickness-t-as-defined-in-figure-2-for-the-crystals-required-along-with-the-appropriate-tolerances-are-given-in-table-1. .unnumbered}

+-----------------------------------------------------------------------+
| #  {#section-2 .unnumbered}                                           |
+-----------------------------------------------------------------------+
| # Figure 2: The dimensions of the HOPG crystal plate                  |
| s. {#figure-2-the-dimensions-of-the-hopg-crystal-plates. .unnumbered} |
+-----------------------------------------------------------------------+

#  {#section-3 .unnumbered}

Table 1: Dimensions of the crystals required

+-----------------------+-----------------------+-----------------------+
| # Dimension {#d       | # Value (mm) {#       | #                     |
| imension .unnumbered} | value-mm .unnumbered} | Tolerance (mm) {#tole |
|                       |                       | rance-mm .unnumbered} |
+-----------------------+-----------------------+-----------------------+
| # Length (L) {#       | # 50 {#s              | # ±0.1 {#s            |
| length-l .unnumbered} | ection-4 .unnumbered} | ection-5 .unnumbered} |
+-----------------------+-----------------------+-----------------------+
| # Height (H) {#       | # 12 {#s              | # ±0.1 {#s            |
| height-h .unnumbered} | ection-6 .unnumbered} | ection-7 .unnumbered} |
+-----------------------+-----------------------+-----------------------+
| # Thickness (T) {#thi | # 2 {#s               | # ±1 {#s              |
| ckness-t .unnumbered} | ection-8 .unnumbered} | ection-9 .unnumbered} |
+-----------------------+-----------------------+-----------------------+

#  {#section-10 .unnumbered}

# The crystals should have a mosaic spread of 0.8°±0.2° full width at half maximum (FWHM). {#the-crystals-should-have-a-mosaic-spread-of-0.80.2-full-width-at-half-maximum-fwhm. .unnumbered}

#  {#section-11 .unnumbered}

# A total number of 84 individual crystals, each of the dimensions given in Table 1, each with a mosaic spread of 0.8°±0.2° FWHM, are required. {#a-total-number-of-84-individual-crystals-each-of-the-dimensions-given-in-table-1-each-with-a-mosaic-spread-of-0.80.2-fwhm-are-required. .unnumbered}

#  {#section-12 .unnumbered}

#  {#section-13 .unnumbered}