Quality Assurance Plan

**for**

**The Spallation Neutron Source Super-Conducting Linac (SCL)**

**Beam Position Monitors (BPMs)**

![](media/image1.png){width="4.1715277777777775in"
height="4.916666666666667in"}

SCL BPM Assembly

Table of Contents

[1 Procure the specified materials.
4](#procure-the-specified-materials.)

[2 Fabricate piece parts according to LANL supplied drawings and
statement of work.
4](#fabricate-piece-parts-according-to-lanl-supplied-drawings-and-statement-of-work.)

[3 LANL to procure and provide the KAMAN vacuum feed throughs.
4](#lanl-to-procure-and-provide-the-kaman-vacuum-feed-throughs.)

[4 Fabricate any fixtures required for brazing.
4](#fabricate-any-fixtures-required-for-brazing.)

[5 Clean parts to be shipped out to the braze facility.
4](#clean-parts-to-be-shipped-out-to-the-braze-facility.)

[6 Procure the specified braze alloys.
4](#procure-the-specified-braze-alloys.)

[7 Weld Flange Weld Spacers to BPM Cover.
4](#weld-flange-weld-spacers-to-bpm-cover.)

[8 Ship the BPM to the Brazing facility.
5](#ship-the-bpm-to-the-brazing-facility.)

[9 Braze the BPM cover to the electrode.
5](#braze-the-bpm-cover-to-the-electrode.)

[10 Ship the BPM back to the Machine shop.
5](#ship-the-bpm-back-to-the-machine-shop.)

[11 Weld the mini-conflats onto the Weld Flange Spacers.
5](#weld-the-mini-conflats-onto-the-weld-flange-spacers.)

[12 Install Signal pins and pin collars along with feed throughs.
5](#install-signal-pins-and-pin-collars-along-with-feed-throughs.)

[13 Ship BPM to LANL for mapping. 5](#ship-bpm-to-lanl-for-mapping.)

[14 Map the BPM. 5](#map-the-bpm.)

[15 Ship BPM to SCL fabricator for installation in SCL intersegment.
6](#ship-bpm-to-tjnl-for-installation-in-scl-intersegment.)

[16 Install BPM in SCL intersegment.
6](#install-bpm-in-scl-intersegment.)

[17 Ship SCL to Oak Ridge. 6](#ship-scl-to-oak-ridge.)

[Appendices 7](#appendices)

[Appendix A -- Dimensional Inspection
7](#appendix-a-dimensional-inspection)

[Appendix B -- Machining 7](#appendix-b-machining)

[Appendix C -- Cleaning 7](#appendix-c-cleaning)

[Appendix D -- Shipping 7](#appendix-d-shipping)

[Appendix E -- Brazing 8](#appendix-e-brazing)

[Appendix F -- Leak Checking 8](#appendix-f-leak-checking)

[Appendix G -- Welding 8](#appendix-g-welding)

[Appendix H -- DC Resistance Measurement
8](#appendix-h-dc-resistance-measurement)

[Appendix I -- S-Parameter Measurements
9](#appendix-i-s-parameter-measurements)

[Appendix J -- TDR Measurements 9](#appendix-j-tdr-measurements)

[Appendix K -- SCL BPM Mapping Procedure
9](#appendix-k-scl-bpm-mapping-procedure)

[Description 9](#description)

[Calibration 10](#calibration)

[BPM support 11](#bpm-support)

[Mapping the BPM 12](#mapping-the-bpm)

[Data Products 12](#data-products)

[Appendix L Check off sheet for SCL BPM
14](#appendix-l-check-off-sheet-for-scl-bpm)

This document is a supplement to the Statement of Work for the purpose
of documenting the Quality Assurance efforts. If there is any
discrepancy between the two documents the Statement of Work shall
govern.

# Procure the specified materials.

Material certification shall be provided to a designated LANL
representative (shop liaison or responsible engineer) for the stainless
steel (ASTM 304L).

# Fabricate piece parts according to LANL supplied drawings and statement of work.

> Fabricate BPM 35.0 mm Radius Cover according to drawing number
> 155Y520132.
>
> Fabricate BPM 35.0 mm Radius Electrode according to drawing number
> 155Y520133.
>
> Fabricate BPM 35.0 mm Radius Probe Detail according to drawing number
> 155Y520134.
>
> Fabricate BPM 35.0 mm Radius Flange Weld Spacer according to drawing
> number 155Y520135.
>
> Fabricate BPM 35.0 mm Radius Del Seal Flange Mod according to drawing
> number 155Y520177.
>
> Fabricate BPM 15.0 mm Radius Alignment Plug according to drawing
> number 155Y520107.
>
> Fabricate Transition Region Cover according to drawing number
> 155Y520180.
>
> Fabricate Transition Region Electrode according to drawing number
> 155Y520181.
>
> Fabricate Transition Region Del Seal Flange Mod according to drawing
> number 155Y520160.

For each of the above-specified parts, a dimensional inspection shall be
performed in accordance with (IAW) Appendix A.

Machining and handling of the specified parts shall be IAW Appendix B.

# LANL to procure and provide the KAMAN vacuum feed throughs.

Los Alamos will provide the specified KAMAN vacuum feed throughs,
853890-001

> A certificate of conformance is provided by KAMAN stating that the
> shipped feed throughs have passed their internal QA checks.

# Fabricate any fixtures required for brazing.

These fixtures are provided by the vendor to facilitate brazing and
post-brazing machining operations, there is no QA requirement for the
fixturing.

# Clean parts to be shipped out to the braze facility.

Parts shall be cleaned prior to brazing in accordance with standard
brazing practice. The cleaning procedure shall be approved by the LANL
representative prior to brazing operations.

> The fabricator shall ship the specified parts IAW Appendix D.

# Procure the specified braze alloys.

The brazing facility shall provide certification of the brazing alloys
used to the designated LANL representative (shop liaison or responsible
engineer). For the brazing operation specified on "BPM 35.0 mm RADIUS
Subassembly" drawing number 155Y520131 or "BPM Transition Region Braze
Subassembly" drawing number 155Y520179, the specified alloy is similar
or equal to Wesgo Metals Copper (99.99% copper).

# Weld Flange Weld Spacers to BPM Cover.

Assemble the parts shown on "BPM 35.0 mm Radius Subassembly" drawing
number 155Y520131 or "BPM Transition Region Braze Subassembly" drawing
number 155Y520179. Use the alignment plugs to locate the "Weld Flange
Spacers" and weld the spacers into place. These four welds must be leak
tight.

> The joints produced by this operation must be tested to ensure that it
> is leak tight. Leak testing shall be done IAW Appendix F.

# Ship the BPM to the Brazing facility.

Shipping of the parts shall be IAW appendix D.

# Braze the BPM cover to the electrode.

Again referring to "BPM 35.0 mm Radius Subassembly" drawing number
155Y520131 or "BPM Transition Region Braze Subassembly" drawing number
155Y520179, use the alignment plugs to position the electrodes according
to note #904 and the specified dimension.

Braze the parts specified on "BPM 15.0 mm Radius Subassembly" drawing
number 155Y520121.

Brazing shall be done IAW Appendix E.

> The joint produced by this operation must be tested to ensure that it
> is leak tight. Leak testing shall be done IAW Appendix F.

A dimensional inspection shall be performed on the location of the
electrode fingers IAW Appendix A, to insure that the proper amount of
deflection was achieved.

# Ship the BPM back to the Machine shop.

Shipping of the brazed parts shall be IAW appendix D.

# Weld the mini-conflats onto the Weld Flange Spacers.

Referring to "BPM 35.0 mm Radius Assembly" drawing number 155Y520130 or
"BPM Transition Region Assembly" drawing number 155Y520178, weld the
Del-Seal Flanges (PN130003) to the weld flange spacers.

Welding shall be done IAW appendix G.

# Install Signal pins and pin collars along with feed throughs.

> Referring to "BPM 35.0 mm Radius Assembly" drawing number 155Y520100
> or "BPM Transition Region Assembly" drawing number 155Y520178, install
> pins, pin collars and KAMAN feed throughs. Machine pin length until
> the dimensional requirements of note #902 are satisfied.
>
> A dimensional inspection shall be performed on the location of the
> electrode fingers IAW Appendix A.
>
> A final leak test of the fully assembled BPM shall be preformed. Leak
> testing shall be done IAW Appendix F.
>
> Fabrication is complete, payment required to vendor.

# Ship BPM to LANL for mapping.

> Shipping of the BPM shall be IAW appendix D.

# Map the BPM.

> Map the BPM IAW appendix K.
>
> Perform DC resistance measurement IAW appendix H.
>
> Perform S11 parameter test IAW appendix I.
>
> Perform TDR response measurements IAW appendix J.

# Ship BPM to TJNL for installation in SCL intersegment.

> Shipping of the BPM shall be IAW appendix D.

# Install BPM in SCL intersegment.

> Perform DC resistance measurement IAW appendix H.
>
> Perform S11 parameter test IAW appendix I.
>
> Perform TDR response measurements IAW appendix J.

# Ship SCL to Oak Ridge.

> Perform DC resistance measurement IAW appendix H.
>
> Perform S11 parameter test IAW appendix I.
>
> Perform TDR response measurements IAW appendix J.

# Appendices {#appendices .unnumbered}

## Appendix A -- Dimensional Inspection {#appendix-a-dimensional-inspection .unnumbered}

The fabricator shall perform a 100% dimensional inspection of the
specified parts. A written report of all dimensions shall be provided.
Report documents shall be produced in electronic formats such as
Microsoft Word, Excel and or Adobe Acrobat PDF. Hard copies of written
inspection reports shall be included with each shipment.

## Appendix B -- Machining  {#appendix-b-machining .unnumbered}

The fabricator shall not use Sulfur based machining fluids or oils on
any parts.

## Appendix C -- Cleaning {#appendix-c-cleaning .unnumbered}

Cleaning operations on individual parts and sub-assemblies necessary for
brazing or electron beam welding shall be done in accordance with
standards particular to those industries. These cleaning procedures
shall be submitted to and agreed upon by LANL.

After all qualification tests are performed, all surfaces of the BPM
assemblies must be carefully cleaned for a high vacuum environment.
Prior to packaging the BPM assemblies, they must be cleaned according to
the following procedure: (Note, vinyl class 100 powder free gloves shall
be worn during this entire cleaning process and all wiping will take
place with 100% cotton cloth or white cleaning tissues)

1.  Acetone wipe all surfaces - use a new clean cloth/tissue.

2.  Isopropyl alcohol (IPA) wipe all surfaces - use a new clean
    cloth/tissue.

3.  Acetone wipe all surfaces a second time using grade GC RESOLVE GRADE
    Acetone and new clean cloth/tissue.

4.  Isopropyl alcohol (IPA) wipe all surfaces a second time - use a new
    clean cloth/tissue.

5.  Change from vinyl gloves to clean white cotton gloves before
    handling cleaned assembly.

Any deviation in this set of cleaning steps must have prior written
approval from the LANL representative. The deviation request must be
accompanied with sufficient documented proof that the alternative
cleaning process equals or is better than the proposed procedure.

## Appendix D -- Shipping {#appendix-d-shipping .unnumbered}

The seller shall be responsible for purchasing or fabricating shipping
containers for all transportation of machined components, BPMs,
subassemblies and completed assemblies during all stages of fabrication,
welding, brazing, and testing. The shipping container(s) shall be
designed to provide the contents protection from all damages, scratches,
marks and etc. during the packaging and shipping process. Contents shall
be stabilized against movement, and prevented from any mechanical or
chemical damage during transportation. Wooden, hard shell plastic or
metallic containers that prevent impact damage and bending shall be
used. The use of any type of plastic materials in the containers
requires approval of LANL due to the possible outgassing of such
materials and their permanent effect on the copper components.

## Appendix E -- Brazing {#appendix-e-brazing .unnumbered}

Furnace braze shall be in accordance with ANSI/AWS C3.6-1990, Class C.
Braze using alloy similar or equal to Wesgo Metals Copper (99.99%
copper). All dimensions on LANL supplied drawings apply after brazing.
Braze symbols on drawings shall be interpreted in accordance with AWS
A2.4. Any conflicts or questions related to application or
interpretation of weld symbols should be directed to LANL for
disposition and clarification. Clean all parts prior to brazing with the
accepted process. The cleaning process shall be capable of removing all
oxides from the braze joints prior to brazing.

## Appendix F -- Leak Checking {#appendix-f-leak-checking .unnumbered}

All welded and brazed joints, subassemblies, and completed BPM
assemblies (155Y520100) shall be leak checked using the following: Final
assembly shall be leak tight. All leak testing shall be done using a
Mass Spectrometer Leak Detector (MSLD) with a minimum sensitivity to
Helium of 9 x 10^-10^ std cc/sec or lower. The MSLD shall be calibrated
with a standard helium leak source possessing a leak rate of 10^-9^ std
cc/sec or lower. The part being tested will be evacuated to a (total)
pressure of not greater than 5 x 10^-5^ Torr before the leak testing is
performed. In addition, all leak testing shall be of the Tracer Probe
Type - using a Helium gas probe to introduce the Helium tracer gas to
the outside surface of the item being tested. At least one of the tests
must consist of placing the part inside a plastic bag with helium gas.
Helium shall be introduced inside the bag so as to bathe the evacuated
component in Helium. A component shall be deemed to pass testing if it
exhibits **[NO DETECTABLE LEAKS]{.underline}** at or above 2 x 10^-9^
std cc/sec after it has soaked in Helium for 1 minute. A certificate of
compliance traceable to national standards for the equipment being used
on this job must be maintained on file at the testing firm's place of
business and/or at the location where the testing is being performed.
These certificate(s) must be made available to LANL personnel or their
representatives for inspection. The MSLD shall be calibrated before and
after each series of tests. Testing shall be done in accordance to ASTM
E - 1603-99. Any exceptions to these instructions must be obtained in
writing from LANL.

## Appendix G -- Welding {#appendix-g-welding .unnumbered}

Weld in accordance with ANSI/AWS D1.1 & D10.4.-1996. Electron Beam (EB)
weld in accordance with MIL-STD-1595A. Weld procedures and fixtures
shall be selected to control distortion within dimensional limits
bounded by University drawings. All dimensions on University supplied
drawings apply after welding. Weld symbols on drawings shall be
interpreted in accordance with AWS A2.4. Any conflicts or questions
related to application or interpretation of weld symbols should be
directed to the University for disposition and clarification.

## Appendix H -- DC Resistance Measurement {#appendix-h-dc-resistance-measurement .unnumbered}

All resistance measurements are to be made to an accuracy of ± 0.001 Ω
or ± 5%, whichever is greater. All measurements shall be made with a
calibrated voltmeter/current meter, or verified with a second
measurement instrument to within ± 5%. All measurements are to be done
using the 4-point measurement technique such that measurement lead
contact resistances are not included in the measurements. If a
resistance measurement is made with respect to the center pin of a SMA
or other small connector, the correct mating pin is to be used for the
connection to the center pin. This mating pin shall have two connecting
points, one for the current connection and one for the sense (or
voltage) connection. The sense connection shall be as close as practical
to the mating portion of the pin, and the current connection should be
further away. If a resistance measurement is made with respect to the
ground/shield side of an SMA or other coaxial connector with a rotating
nut, the measurement shall be with respect to the non-rotating body of
the connector. Instrumentation calibration is not required to be
traceable to NIST or other calibration laboratories as the data taken is
for verification of proper assembly. This data is not intended to be
used for BPM calibration purposes. The data is for verification of
consistency between the four lobe circuits of each BPM.

## Appendix I -- S-Parameter Measurements {#appendix-i-s-parameter-measurements .unnumbered}

All S-parameter measurements shall be made with a network analyzer such
as a HP 8753C or equivalent-accuracy instrument. The instrument should
be calibrated using the appropriate calibration test kit (SMA or 3.5-mm)
immediately priorto making the measurements. All measurements shall be
at both 402.5 MHz and at 805 MHz. All data should be recorded with at
least 0.01 dB and 0.01 degree resolution. Instrumentation calibration is
not required to be traceable to NIST or other calibration laboratories
as the data taken is for verification of proper assembly. This data is
not intended to be used for BPM calibration purposes. The data is for
verification of consistency between the four lobe circuits of each BPM.

## Appendix J -- TDR Measurements {#appendix-j-tdr-measurements .unnumbered}

All measurements shall be made with a TDR with a rise time of either ≤50
ps, or as short as possible if the combined cable/lobe length is too
long for this resolution. If possible, the TDR instrument should be
calibrated and normalized data traces recorded. The data should be
averaged by a factor of at least 256. Vertical resolution shall be ≤0.1
ohms. Cable impedance measurements should be made over the first 1- to
2-ns of cable length from the TDR calibration point, due to the
relatively high series loss component of the KAP50-5 cable.
Instrumentation calibration is not required to be traceable to NIST or
other calibration laboratories as the data taken is for verification of
proper assembly. This data is not intended to be used for BPM
calibration purposes. The data is for verification of consistency
between the four lobe circuits of each BPM.

##  Appendix K -- SCL BPM Mapping Procedure {#appendix-k-scl-bpm-mapping-procedure .unnumbered}

SCL BPM Mapping Procedure

### Description {#description .unnumbered}

> The BPM will be mapped using the LANSCE-1 BPM mapping station. A
> schematic of the mapping station is shown below. The station consists
> of the following equipment:
>
> Hewlett Packard model 8640B signal (This instrument shall have an up
> to date calibration sticker or certificate).
>
> Boonton 4300 RF Power meter (This instrument shall have an up to date
> calibration sticker or certificate).
>
> 4 Boonton 51075 Power sensors (These devices shall have an up to date
> calibration sticker or certificate).
>
> Mapping fixture hardware
>
> 0.004 inch diameter stainless steel wire (antenna)
>
> 2, 8 inch travel, Parker Daedal precision linear bearing tables model
> number 406008LN
>
> 1, 4 inch travel, Parker Daedal precision linear bearing table model
> number
>
> 3 Compumotor 6000 series indexer/driver motor controllers
>
> PC based motion control using LabVIEW software
>
> PC based data acquisition using PCI card running LabVIEW software

![](media/image1.wmf)

Schematic of Mapper System

An RF signal either 402.5 or 805 MHz is generated by the HP 8640. This
signal is transmitted to the taut wire running through the BPM. The RF
signal on the wire is detected by the Boonton 51075 power sensors
connected to each electrode (T, B, L, R) of the BPM. The power on the
electrode is detected at the sensors and is read out at the Boonton 4300
power meter. This reading is acquired by the data acquisition card on
the PC under the control of National Instruments LabVIEW software. The
PC based motion control will position the wire at numerous places within
the bore of the BPM and a reading is taken at each position. The
positioning of the wire is also accomplished using a LabVIEW program,
which commands the Compumotor indexer/driver. The indexer/driver sends
electric pulses to the stepper motors, which drive the Parker/Daedal
precision linear bearing tables. The stepper motor positioning system
utilizes linear encoders to provide feedback to the Compumotor
controller. All of this functionality has been wrapped up into a single
program that automates the data acquisition process.

While it is expected that the mapping system will use the equipment
described herein, it is acceptable to substitute different instruments
as long as the absolute accuracy and performance of these are at least
as good as that of the original equipment.

### Calibration {#calibration .unnumbered}

> There are two items to calibrate during the BPM mapping process. The
> first is the Boonton power meter and the second is the wire
> positioning system.

#### Calibrating the Boonton 4300 RF Power Meter {#calibrating-the-boonton-4300-rf-power-meter .unnumbered}

> The power meter comes with an internal calibration system. You simply
> set the desired channel to calibrate and connect the calibration line
> to that channel's power sensor. The power meter sends out a series of
> signals of known power and the sensor's reading is compared/calibrated
> to the known value. The power sensors are calibrated over a range of
> --75 dB to 0 dB. Each sensor is in turn calibrated. This is done once
> a day prior to the first map.

#### Calibrating the wire positioning system {#calibrating-the-wire-positioning-system .unnumbered}

> The mapping fixture has two blocks that have been set square in
> relation to the motion of the precision linear positioning tables.
> These blocks define the X and Y axes of the system. A precision made
> standard is used to locate a pin an equal (+/- .0005") distance from
> each of the blocks. This pin defines the coordinates (0,0) of the
> positioning system. Two sets of Keyence lasers, aligned with each
> axis, are used to measure the position of this pin. The laser system
> is independent of the positioning system. Once the laser system reads
> the pin's position the value is set to zero. With the laser system now
> set to zero the standard is removed and the wire is placed into the
> fixture. Again using the LabVIEW program the wire can be placed at the
> same location as the standard pin was (0,0) and the positioning system
> is now set to zero. This calibration can be done as often as desired.
> Generally it is done three times for a set of 10 maps. This gives the
> operator some sense of the repeatability of the set up.

### BPM support {#bpm-support .unnumbered}

> The BPM support system is shown in the following figure.

![](media/image2.png){width="3.4in" height="3.8958333333333335in"}

> BPM Mechanical Support
>
> The BPM is supported by the fiducials provided built in flange of the
> BPM body. Four precision made flats with 1/8" holes are located
> according to top, bottom, left, and right. These holes correspond to
> the X and Y BPM axes. Two support blocks are used to locate the BPM on
> the mapping station. The support blocks have been dimensionally
> inspected on a coordinate measuring machine.

### Mapping the BPM {#mapping-the-bpm .unnumbered}

> The procedure for mapping a SCL BPM is as follows:
>
> Calibrate the Boonton RF Power meter as described above.
>
> Calibrate the wire positioning system as described above.
>
> Remove the wire from the mapper.
>
> Install the SCL mechanical support equipment.
>
> Install the SCL BPM.
>
> Install the wire into the mapper.
>
> Connect the cable from the HP 8640B Signal Generator to the wire.
>
> Connect the signal cables from the BPM to the Boonton 51075 Power
> sensors, taking care to connect the Top, Bottom, Left, and Right
> electrode cables to the appropriate power sensor.
>
> Set up the data acquisition program by typing in:
>
> The file path/name.
>
> The number of maps to run.
>
> The ID of the BPM.
>
> The current map number.
>
> The number of data points to be taken (size of the positional step).
>
> Select the write to file button.
>
> Select the four data point button.
>
> The diameter of the BPM (use 90% of the BPM bore).
>
> The delay time (time the wire sits at position for acquisition).
>
> Any comments appropriate may be entered as well.
>
> Turn on the RF from the signal generator.
>
> Run the VI.

### Data Products {#data-products .unnumbered}

> The data acquired by the system is the detected power level at each
> sensor. For each X, Y position there are four data points taken,
> corresponding to Top, Bottom, Left, and Right electrodes. The program
> will also calculate the differences between opposing electrodes as
> appropriate for the coordinate system being used. For example
> Top-Bottom (Y axis) and Left-Right (X axis) would be used for a
> right-handed coordinate system. The raw data file will contain the
> readings from all four sensors as well as the two subtracted values.
>
> Generally ten raw data files are taken for each BPM. Past practice has
> been to set up the mapper by following the steps outlined above, run
> three maps, break down the system, start over with step 1 from above,
> run three more maps, break down the system a second time, start over
> with step 1 again, and finally run the final four maps. This allows
> for better statistical analysis and also highlights the repeatability
> of the system.
>
> Each raw data set is then evaluated separately using the X and Y
> position data along with the differentiated power data along the X and
> Y axes, Rx and Ry. Two different types of 3^rd^ order polynomial fits
> are done to the data sets. The first type is a fit done using the X
> and Y positions to fit the power data in terms of Rx or Ry (forward
> fit). The second type of fit uses the X and Y power data to fit to the
> X or Y position data (reverse fit). Each of these fits can be done
> using either 4 coefficients or 10 coefficient functions. The following
> table summarizes the different fits used to analyze the data.

  ------------------- ------------------- --------------------------------
  Data Product Table                      

  Input               Data to fit         Result

  X and Y position    Rx differentiated   4 coefficient polynomial fit
                      power               (A~0~ -- A~3~)

                                          10 coefficient polynomial fit
                                          (A~0~ -- A~9~)

  X and Y position    Ry differentiated   4 coefficient polynomial fit
                      power               (B~0~ -- B~3~)

                                          10 coefficient polynomial fit
                                          (B~0~ -- B~9~)

  Rx and Ry diff      X position          4 coefficient polynomial fit
  power                                   (C~0~ -- C~3~)

                                          10 coefficient polynomial fit
                                          (C~0~ -- C~9~)

  Rx and Ry diff      Y position          4 coefficient polynomial fit
  power                                   (D~0~ -- D~3~)

                                          10 coefficient polynomial fit
                                          (D~0~ -- D~9~)
  ------------------- ------------------- --------------------------------

##  Appendix L Check off sheet for SCL BPM  {#appendix-l-check-off-sheet-for-scl-bpm .unnumbered}

BPM serial number \_\_\_\_\_\_\_\_\_\_\_\_\_\_:

  ------ ----------------------------- --------------------- ---------- ----------
  Item   Item description              Testing to be done    Date       Initials
                                                             Complete   

  1      Material certification        Certification                    

  2      Fabricate piece part          Dim Inspection                   
         155Y520132                                                     

         Fabricate piece part          Dim Inspection                   
         155Y520133                                                     

         Fabricate piece part          Dim Inspection                   
         155Y520134                                                     

         Fabricate piece part          Dim Inspection                   
         155Y520135                                                     

         Fabricate piece part          Dim Inspection                   
         155Y520177                                                     

         Fabricate piece part          Dim Inspection                   
         155Y520180                                                     

         Fabricate piece part          Dim Inspection                   
         155Y520181                                                     

         Fabricate piece part          Dim Inspection                   
         155Y520160                                                     

  3      KAMAN feed through            QA certification                 
                                       (from KAMAN)                     

  4      Brazing fixtures              N/A                              

  5      Clean parts                   Verify                           

  6      Braze alloy material          Certification                    
         certification                                                  

  7      Weld Flange Weld Spacers to   Vacuum Leak Check                
         BPM Cover                                                      

  8      Ship parts to braze facility  N/A                              

  9      Braze the BPM Cover to the    Vacuum Leak Check                
         Electrode                                                      

         155Y520131                    Dim Inspection                   

         155Y520179                    Dim Inspection                   

  10     Ship BPM back to Machine Shop N/A                              

  11     Weld mini-conflats onto the   Vacuum Leak Check                
         Weld Flange Spacers                                            

  12     Install Signal pins along                                      
         with feed throughs                                             

         155Y520130                    Dim Inspection                   

         155Y520178                    Dim Inspection                   

                                       Vacuum Leak Check                

  13     Ship BPM to LANL              N/A                              

  14     Map assembly                  Data from mapping                

                                       DC resistance                    

                                       S11 parameters                   

                                       TDR response                     

  15     Ship BPM to SCL Fabricator    N/A                              
         for installation in SCL                                        
         intersegment                                                   

  16     Install/Align BPM in SCL      DC resistance                    
         intersegment                                                   

                                       S11 parameters                   

                                       TDR response                     

  17     Deliver SCL to Oak Ridge for  DC resistance                    
         installation                                                   

                                       S11 parameters                   

                                       TDR response                     

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