**NASA GLENN SPECIFICATION FOR AN X-RAY DIFFRACTION SYSTEM, PR# 199480**

Proposed systems shall contain the following components and meet or
exceed the given specifications. Vendors shall provide descriptive
literature in the form of sales brochures and system information
verifying existing capabilities.

I.  **X-RAY - ENCLOSURE:**

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A.  The system x-ray enclosure shall have a large opening providing easy
    access for sample loading and goniometer configuration changes.

B.  The system shall have large leaded Plexiglas doors for optimum
    visibility and accessibility.

C.  The system shall have full radiation protection.

D.  The system shall have two independent security circuits.

E.  The system shall have x-ray radiation warning lights.

F.  The system when operational shall pass a radiation leakage test
    performed by the NASA Radiation

Safety Committee to verify radiation protection.

II. **GONIOMETER:**

> The goniometer shall be a vertical theta/theta design with the
> following capabilities:

A.  The controlling mechanism shall have both stepper motors and optical
    encoders for optimum scanning speed and positioning precision.

B.  The minimum step size shall be 0.0001 degree.

C.  The reproducibility of the system shall be plus or minus 0.0001
    degree.

D.  The goniometer shall have high precision dovetail tracks for
    variable positioning of all components.

E.  Shall accommodate scintillation, solid-state and position-sensitive
    detectors with quick and easy exchange without realignment.

F.  Shall accommodate monochromators for Cr, Fe, Co, Cu, and Mo,
    radiation.

G.  2 arm for detector shall allow for a variable sample to detector
    distance.

H.  Collimators and beam stop for use with K filter or monochromator.

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III. **X-RAY GENERATOR:**

A. X-ray generator shall be of solid-state design.

B. X-ray generator shall have a continuous output power of 3.0 kW
minimum.

C. X-ray generator shall have a voltage range of 10 to 60 kV, tube
current of 2 to 60 mA, with a stability of tube voltage and current of
less than 0.01 percent with 10 percent line fluctuation.

D. Computer controlled or manual operation.

1.  Permits remote software control of tube current and voltage.

2.  The kV and mA settings must be continuously adjustable, with digital
    readout of measured units.

3.  Transfers generator status and error messages to PC.

4.  Permits selection and locking of generator operating parameters and
    limit values.

5.  Permits current or default values to be used for tube voltage and
    current.

6.  Has diagnostics and operation time counter.

7.  The X-ray generator shall include a microprocessor with automatic
    startup and burn-in cycle for new X-ray tubes.

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IV. **X-RAY TUBE:**

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A.  A 2.2 kW Cu long fine focus tube (0.4 x 12 mm) that shall allow the
    tube to be rotated for point source without realignment.

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V.  **SAMPLE STAGE:**

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A.  All sample stages shall have a pre-aligned interface to allow
    interchange without the need for realignment**.**

B.  As a minimum the system shall have a multi-purpose sample stage with
    capability for a minimum of 20 mm sample height and method for rapid
    alignment.

C.  Sample stage shall be capable of future installation of a 1200^o^C
    sample chamber with ability to change in less than one hour.

**VI. INCIDENT BEAM OPTICS SHALL INCLUDE:**

A. A software controlled variable divergence slit.

B.  Appropriate Soller slits to limit the lateral divergence of the beam
    (along the goniometer axis) on the sample.

C.  Incident beam anti scatter slit to improve peak to background ratio.

**VII. DIFFRACTED BEAM OPTICS SHALL INCLUDE**:

A.  A beam knife to improve peak to background ratio for 2 theta values
    \< 10 degrees.

B.  Appropriate Soller slit with a slot available for placement of a
    K-Beta filter or manual beam attenuator.

C.  A flat graphite diffracted beam monochromator to reduce the effect
    of fluorescent radiation, also used with a higher speed detector
    system, shall also use optics with or without monochromator and not
    require realignment.

**VIII. DETECTOR SHALL BE CAPABLE** **OF:**

A.  Possessing a detector system that significantly performs faster
    measurements. Measurements that are a minimum of 15 times faster
    when compared to conventional electronics using a proportional
    counter, scintillating counter or equivalent, while maintaining or
    improving signal to noise characteristics and peak resolution.

**IX. SOFTWARE, THE SYSTEM SOFTWARE SHALL INCLUDE THE FOLLOWING:**

A.  The operating system shall be Microsoft®Windows 2000.

B.  Microsoft®Office 2000 or better, including Microsoft Access.

C.  Norton Systemworks.

D.  The system operation software shall be able to perform the following

    1.  Handle and maintain data collection and storage

    2.  Contain software for alignment and system performance evaluation

    3.  Search-match algorithm with peak identification and peak profile
        determination, including automatic phase identification

    4.  ICDD reference database, including user license and four (4)
        years of annual updates

    5.  Routines for crystallite size and micro-strain evaluation

    6.  Indexing of powder patterns

    7.  Structure determinations

    8.  Stress analysis software

    9.  Analytical software for crystallographic and Rietveld analysis

    10. Software that can implement a batch program, optimize
        calibration based on standards, customize the user interface,
        and allows customized presentation of results

**X. COMPUTER SYSTEM AND PRINTER AS A MINIMUM SHALL BE:**

A.  A 2.0 GHz Pentium 4 processor, 512 MB DRAM, 80 GB hard drive, 3Com
    ethernet card 100 Mbps, Iomega 250 MB Zip drive with five (5) 250 MB
    disks, CD ROM with 40x read speed, CD ROM recordable/rewritable/read
    with m 20x/10x/40x speeds, 18.1 inch LCD flat panel/screen monitor,
    HP color ink jet printer with cable.

**XI.** **OTHER INCLUSIONS THAT SHALL BE MADE A PART OF THIS PURCHASE:**

A.  Shipping and delivery of entire system, including any and all
    optional equipment and accessories.

    1.  Installation and set up of entire system to operational status.

    2.  Provide pre-installation guide and milestone with bid detailing
        our facility requirements.

    3.  After on-site operational status is achieved, a demonstration is
        required to show that the XRD is operating and providing data
        that meets the purchased specifications

B. System shall include a two (2) year warranty for parts, labor,
emergency and preventive maintenance.

C. Documentation shall include but not be limited to the following:

> 1\. Two (2) complete sets of printed manuals and tutorials for all
> system software.

2\. Data file structure to be provided.

3\. On-line Windows Help for system software.

4\. Two (2) complete sets of printed manuals for the system hardware

D. Training including travel, the following training shall be included
in the bid price:

1.  Minimum of two (2) customer/user training/class/instruction at
    manufacturer's site, preferably prior to system delivery to
    customer.

2.  Minimum of two (2) customer/user training/class/instruction on-site,
    4 days.

**XII. OPTIONS SHALL BE AVAILABLE BUT ARE NOT LIMITED TO THE
FOLLOWING:**

A.  Monocapillary collimator that converges and collimates beam size to
    at least 0.3mm, includes microscope to view the area of excitation.

B.  A high temperature stage capable of 1200^o^C operation, including
    automated software control of temperature and vacuum system.

C.  Texture cradle to perform pole figure analysis, including any
    additional required hardware and software.