### LARP: Magnet-Connection Interface Documentation Guidelines

**Author: A.F. Lietzke (LBNL)**

(Adapted from R. Carcagno, VMTF-01-001, FNAL)

"VMTF Test Stand: Magnet/DAQ System Interface"

Review History:

  ---------------------------------------------------- ------------------
  Revision A:                                          Date: 06/09/2005

  Revision B:                                          Date: 06/30/2005

  Revision C:                                          Date: 07/06/2005

  Revision D:                                          Date: 07/28/2005

  Revision E:                                          Date: 07/28/2005

  Last Reviewed: P. Wanderer, S. Feher, M. Nyman, A.   Date: 07/28/2005
  McInturff                                            

  Approved for Trial: P. Wanderer, S. Feher, M. Nyman, Date: 07/28/2005
  A. McInturff                                         

  Final Approval:                                      Date:
  ---------------------------------------------------- ------------------

Please route feedback and revision requests to AFLietzke@lbl.gov.

\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-- TABLE OF
CONTENTS \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\--

LARP: Magnet-Connection Interface Documentation Guidelines
[1](#larp-magnet-connection-interface-documentation-guidelines)

PURPOSE OF Document: [3](#purpose-of-document)

SCOPE OF DOCUMENT [3](#scope-of-document)

DOCUMENTATION EXPECTATIONS: [3](#documentation-expectations)

DIVISION OF RESPONSIBILITIES: [3](#division-of-responsibilities)

Summary of MAGNET & Magnet-test Sub-document
[4](#summary-of-magnet-magnet-test-sub-document)

MECHANICAL INTERFACE Sub-document
[5](#mechanical-interface-sub-document)

POWER INTERFACE Sub-document [6](#power-interface-sub-document)

PROTECTION INTERFACE Sub-document
[6](#protection-interface-sub-document)

Diagnostics INTERFACE Sub-document
[6](#diagnostics-interface-sub-document)

DIAGNOSTIC DEVICE CALIBRATIONs Sub-document
[7](#diagnostic-device-calibrations-sub-document)

PRE-SHIPMENT Q-A MEASUREMENTS Sub-document
[7](#pre-shipment-q-a-measurements-sub-document)

Magnet-Diagnostic Interface Conventions
[7](#magnet-diagnostic-interface-conventions)

RECOMMENDED DIAGNOSTIC WIRING PRACTICE
[8](#recommended-diagnostic-wiring-practice)

Heater ConnectorS [9](#heater-connectors)

Voltage-Tap Connectors [10](#voltage-tap-connectors)

Low Voltage (Strain-Gauge & RTD) Connectors
[12](#low-voltage-strain-gauge-rtd-connectors)

Schematics AND MAPS [14](#schematics-and-maps)

# PURPOSE OF Document:

##### The purpose of this document is to present explicit guidelines and templates for creating the "Magnet-Connection Interface Documents". The magnet test "Connector-DAQ" interface will be addressed in a separate document.

# SCOPE OF DOCUMENT

This document specifies the following interface-connection documentation
aspects and sub-sections:

1)  Documentation expectations

2)  Division of responsibilities.

3)  Sub-document description and guidelines.

4)  Documentation examples

# DOCUMENTATION EXPECTATIONS:

The "Magnet-Connection Interface" documentation is expected to include
the following sub-documents:

1)  Introduction to magnet: magnet description, feature emphasis,
    primary testing purpose(s), principle test goal(s), performance
    expectations and operational limitations.

2)  Mechanical interface: requirements and features, recommended
    procedures for safe transportation, lifting, tilting, suspending,
    and securing against mechanical hazards.

3)  Power interface: wiring diagrams & requirements, PS requirements,
    appropriate current connections, insulation integrity limits.

4)  Protection interface: internal and connector wiring diagrams and
    heater-PS requirements.

5)  Diagnostic interface: sensor/transducer information, internal and
    connector wiring diagrams; internal and connector wiring labels
    and/or specifications)

6)  Diagnostics calibration tables.

7)  Pre-shipment magnet diagnostic performance and Q-A measurements.

# DIVISION OF RESPONSIBILITIES:

The "Magnet-Connection Interface" documentation is expected to be
prepared by the magnet builder, in collaboration with personnel at the
proposed test facility, in accordance with the guidelines in this
document, including the following sequence and division of
responsibilities:

1)  Magnet mfg: Follow the applicable guidelines herein described, while
    designing and building the magnet, paying especial attention to
    those mechanical, electrical, and diagnostic constraints that may
    impact the ability to safely test the magnet, or jeopardize the
    validity of the measurements or their interpretation.

2)  Magnet mfg. and test facility: Jointly create a goal-directed
    diagnostic plan that specifies the number, kind, and location of
    magnet diagnostics (voltage taps, temperature sensors, strain
    gauges, heaters, etc) that are consistent with test facility
    constraints, and the test goals for the magnet.

3)  Magnet mfg: Create all required magnet electrical schematics, up to
    (but not including) the interface connectors, with accurate,
    unambiguous labels for individual devices (V-tap, temp sensor etc.),
    and their associated wiring, according to the standards described in
    these guidelines.

4)  Test facility: Review the above documentation, and, after agreement,
    specify the wiring and connector pin assignment portion of the
    documentation, and return the associated documentation to the magnet
    builder for implementation.

5)  Magnet builder: After the diagnostics devices, and their intended
    interconnection has been approved by all parties, generate the
    diagnostic calibration document file and transmit it to the test
    facility, so the test facility can complete their signal interface
    documentation before the magnet test is scheduled to begin.

6)  Magnet builder: Perform all the relevant Q-A and diagnostics
    measurements before shipping the magnet.

7)  Magnet builder: Bundle a hard copy and electronic copy of the
    accumulated interface documentation, for arrival with the magnet at
    the test facility.

8)  Test Facility: All documentation generated for signal creations and
    acquisition, or generated after magnet arrival at the test facility.
    The guidelines for this documentation are documented in a separate
    document.

# Summary of MAGNET & Magnet-test Sub-document

The "Summary of Magnet..." sub-document is expected to contain
information that will orient its readers to the general information,
background, and R&D goals of the associated magnet. The following
information is expected to be included in this summary:

1)  Summary of "Magnet Production Report":

    a.  Magnet ID/name.

    b.  Description of magnet (e.g., first 1 meter long prototype, 90 mm
        bore, accelerator-quality, Cos-Theta quadrupole magnet for
        upgrading the LHC's interaction region...).

    c.  List of noteworthy magnet features (e.g., aluminum
        shell-supported Nb~3~Sn coils; Coils assembled with 300K
        pre-stress that should develop 180MPa at 4.5K; ...).

    d.  List of noteworthy diagnostic features (e.g., first attempt to
        measure onset of coil-separation via coil-mounted strain-gauges;
        Protection heater only in the outer layer; ...).

    e.  List, description, and significance of noteworthy production
        anomalies (e.g., ramp area de-cabled in coil-C; Coil-D had
        unusual fluffiness in its return-end; Potting voids in Coil-A's
        lead-end; ...).

    f.  Short-sample I(B) plot(s) of un-degraded strand performance at
        requested test temperature(s) (EXCEL format).

    g.  Peak-field load-line B(I) plot.

    h.  Anticipated RRR, dR/dl(300K), 4.2K joint resistance(s).

    i.  Anticipated ramp-rate sensitivity features (if available).

    j.  Table of calculated B-field harmonics at fields where
        measurements are desired.

2)  List of primary purposes of magnet test (e.g. compare magnet
    training and magnetic-field harmonics of a shell-type
    support-structure, and its end-support system, against a collared
    structure and its end-support system)\...

3)  List of principle test goals (e.g., strain-gauge ratcheting before
    first training quench, quench-training curve, ramp-rate sensitivity,
    magnetic-field harmonic analysis, comparison of SG-ratcheting inside
    and outside the coils, comparison of SG-ratcheting with slip-stick
    frequency).

4)  Hipot limitations (voltage, duration, and expected safety
    procedures).

    a.  Coil to heater(s).

    b.  Coil to insulated support structure.

    c.  Coil to insulated diagnostics (assumed to be at diagnostic
        reference potential).

    d.  Coil to cryostat (and anti-cryostat, if applicable).

    e.  Heater to insulated support structure.

    f.  Heater to insulated diagnostics.

    g.  Heater to cryostat (and anti-cryostat, if applicable).

    h.  Insulated support structure to insulated diagnostics.

    i.  Insulated support structure to cryostat (and anti-cryostat, if
        applicable).

    j.  Insulated diagnostics to cryostat (and anti-cryostat, if
        applicable).

5)  Testing limitation information:

    a.  "Out-of-spec" conditions (e.g., coil Q4 had a short to its
        winding island; coil Q2 broke-over to its strain-gauges at
        200 V).

    b.  Maximum allowed conductor temperature (MIIT's, deg.C).

    c.  Maximum protection-heater delay (MIIT's).

    d.  Maximum energy extraction delay (MIIT's)

    e.  Maximum energy extraction voltage.

# MECHANICAL INTERFACE Sub-document

The "Mechanical--Interface" sub-document is expected to contain all the
mechanical information that is relevant for safely and efficiently
lifting, transporting, mounting, securing the magnet for testing,
demounting, and repacking for its return to the manufacturer. While the
test facility is expected to supply the means for holding and securing
the magnet from a cryostat's top-plate, the magnet supplier is expected
to supply the following information in a manner that facilitates timely,
cost-effective magnet testing (i.e., no "last-minute" changes; or
significant alteration of previous agreements, without substantial
justification):

1)  Lifting and attachment specifications and pictures:

    a.  Drawings that will facilitate reliable, secure attachments at
        the test facility.

    b.  Magnet weight.

    c.  Recommended lifting points and requirements.

    d.  Recommended tilting methods and procedures.

    e.  Special care instructions.

    f.  Description of particular mechanical hazards.

2)  Transportation requirements:

    a.  Crate requirements

    b.  Packing and unpacking checklists.

    c.  Special care instructions.

    d.  Transportation tracking and monitor requirements.

    e.  Recommended transportation.

    f.  

3)  Mechanical requirements for attaching and securing the magnet during
    testing:

    a.  Bolt patterns.

    b.  Hole sizes.

    c.  Bolt requirements.

    d.  Cryostat-support rigidities.

    e.  Maximum dimensions.

    f.  Minimum bore diameter

4)  Misc. mechanical:

    a.  

# POWER INTERFACE Sub-document

The "Power Interface" sub-document is expected to contain all
power-related information that is relevant for safe and efficient magnet
testing, including the following:

1)  Intra-coil wiring diagram.

2)  Maximum expected voltage & current required.

3)  Inductance and maximum stored energy

4)  Maximum MIITS delay before attempting energy-extraction.

5)  Maximum safe energy-extraction voltage.

6)  Terminal voltage polarity and reference requirements/preferences.

7)  Splicing requirements, instructions, and/or limitations.

8)  Table of insulation integrity limitations.

9)  

# PROTECTION INTERFACE Sub-document

The "Protection Interface" sub-document is expected to contain all
magnet-protection-related information that is relevant for safe and
efficient magnet testing, including the following:

1)  Desired (or delivered) intra-heater and connector wiring diagram(s),
    and Heater-PS redundancy

2)  Maximum expected current for quenching at 30% of I~ss~.

3)  Expected heater-circuit resistance(s)

4)  Maximum-permitted heater terminal voltages.

5)  Polarity and voltage-reference requirements or preferences (if
    relevant).

6)  MIIT's curve for the magnet.

7)  Maximum MIITS delay before heater discharge

8)  

# Diagnostics INTERFACE Sub-document

The "Diagnostics Interface" sub-document is expected to contain all
diagnostics-related information that is relevant for safe and efficient
magnet testing, including the following:

1.  Listing(s) of physical devices:

    a.  Type (v-tap, strain-gauge, RTD, spot-heaters, ect.)

    b.  Description of physical location

    c.  Device-ID names (preferably coded via type and physical
        location).

2.  Wiring tables, relating the above information with:

    a.  Wire-ID and/or color

    b.  Interface- connector's ID and pin #.

3.  Maps of all physical device locations (e.g., coil, layer, turn-#,
    location relative to significant coil features).

4.  Detailed electrical schematic (showing electrical significance of
    above information).

    a.  Intra-coil diagnostics.

    b.  Structural diagnostics .

    c.  Environmental diagnostics

5.  

# DIAGNOSTIC DEVICE CALIBRATIONs Sub-document

1)  RTD: calibration curves, look-up tables, excitation limits.

2)  Strain-gauge: gauge-factors, calibration curves and curve fits
    (quadratic and cubic)

# PRE-SHIPMENT Q-A MEASUREMENTS Sub-document

1)  V-tap: 300K resistance sequence (wrt indicated reference).

2)  Temperature sensors: 4-wire resistance & temperature, full accuracy.

3)  Strain gauges: 4-wire resistance & strain, full accuracy.

4)  Heaters: 4-wire resistance

5)  Magnet's R, L, Q (100Hz, 1kHz)

6)  Recent 300K hipot results.

7)  All of the pre-assembly strain-gauge results.

```{=html}
<!-- -->
```
1)  

# Magnet-Diagnostic Interface Conventions

Magnet/coil instrumentation is connected to the test facility's DAQ
system via several blocks of Hypertronic connectors that reliably mate
with blocks located within the cryostat's magnet chamber. Subsequent
sections describe each connector in detail, with tables and schematics
that document the relationships between devices, device-locations, and
the assignment of device wires to connector pins. The magnet-half of
each connector module is built from Hypertronic modules that are wired
to the magnet's diagnostic and protection wires. All modules in a block
of modules are assumed to have the same sex, in a manner that the
dominant power/information flow flows out of the female, into the male:

1)  Voltage-tap output (female): 5-pin modules, #LAFST, maximum of 20
    V-taps/coil.

2)  Heater input and monitor (male):

    a.  Quench-heater: 2-pin modules, #LCMSTH??.

    b.  Spot-heater (& heater-status): 5-pin modules #LAMST, 10
        pins/coil.

3)  Low-voltage diagnostics output (female): 17-pin modules, \# LDFSTAH.

4)  Multi-pin, multi-module sequence and voltage-polarity conventions:

    a.  Multi-Pin voltage-sequence: When paired (or otherwise related)
        lower numbered pins are more positive.

    b.  Modules supplying external power: When one or more pin-groups
        are powered, the first two pins in the group supply the power
        (I+, I-).

    c.  Multi-module sequence: Lower numbered modules are more positive.

    d.  4-wire pin-sequence: I+, I-, V+, V- (in order of increasing
        pin-#).

5)  Wires & connectors: uniquely labeled/coded according to the supplied
    schematics.

6)  Pin-diagrams and labels unambiguously describe the orientation of
    each connector.

7)  No connector can be plugged in backward.

# RECOMMENDED DIAGNOSTIC WIRING PRACTICE

1)  Basic Connection-Reliability Rule: Provide sufficient strain-relief
    that will ensure connection integrity despite differential cool-down
    displacements and accidental cable tugging and pulling

2)  Basic Low-Noise Rule: Route each monitor wire along whatever path
    minimizes the net enclosed noise-flux between it and its reference
    wire.

3)  Low-noise voltage-tap wire-routing: Whenever possible, route a V-tap
    monitor wire toward its reference V-tap, as close as possible to the
    coil-segment it is intended to monitor. Upon reaching the reference
    V-tap, route as close as possible to its reference wire (twisting
    whenever possible) until reaching the associated
    diagnostic-attachment plug that connects to the test-facility's
    DAQ-system.

4)  The lowest noise signals result from choosing a magnet-connector
    pin-sequence whose cryostat and test-facility twisted pair wiring
    matches the magnet's twisted pairs. As the twisted-pair sequencing
    usually starts with every connector's #1 pin (check with the
    test-facility), one can choose a magnet connector pin-sequence that
    matches the magnet's twisted-pairs by careful chose of pin-pairs.
    For example, test-facility connector pin-pair 15-16 connect to a
    twisted pair, while pair 16-17 are each connected to a member of
    adjacent twisted-pairs in the test facility. In order to transmit
    all low-noise signals along twisted pairs in the test facility, one
    may occasionally need to parallel adjacent pins on the magnet side
    of the connector.

5)  Splice and lead monitor wiring should be tightly routed along their
    respective leads (taped to the lead if needed), in a manner to
    minimize the loop area.

6)  Reliable, low-noise resistance measurements:

    a.  Minimize the flux-coupling area between V-sensing wires.

    b.  Minimize the flux-coupling area between I-excitation wires.

    c.  Match magnet twisted-pairs with test-facility twisted-pairs.

    d.  Bundle and route "low-voltage" wires well-separated from
        "high-voltage" wires, using extra insulation if required).

7)  Low-noise heater wiring: As heaters are usually pulsed with voltages
    between 50-500V, they generate considerable noise in nearby
    circuits. For minimum inductive and capacitive coupling:

    a.  Twist the heater excitation wires and heater monitor wires as
        tightly as practical, for as far as practical, matching the
        test-facility twisted-pairs in the manner described above (#5).

    b.  Group all heater wires together, and maximize their distance
        from all other diagnostic wires.

8)  High-voltage reliability of Hypertronic V-tap and heater monitor
    connectors is improved by wrapping Kapton tape on the connector's
    side-rails.

9)  Strain-relieve wires with shrink tubing at each connector-pin's
    soldering-cups.

10) Magnet connector conventions:

    a.  Manufacturer: Hypertronics, gold-plated pins.

    b.  Modularity:

        i.  Each coil has its own connector

        ii. Facilitates R&D coil swapping w/o altering any connectors).

    c.  Sex:

        i.  All modules in a connector have the same sex (determined by
            the connector's dominant Poynting/information vector, out
            the female).

        ii. V-tap connector: Female.

        iii. Heater connector: Male (even for heater monitor/status)

        iv. Low-voltage diagnostic modules: Female.

11) Multiple Hypertronic module-ordering and connector alignment:

    a.  Module/pin sequence follows the 17-pin Hypertronics
        pin-sequence:

        i.  Bottom to top within columns

        ii. Female: column \# increases to the right (solder-cup view).

        iii. Male: column \# increases to the left (solder-cup view).

    b.  Connector alignment pins:

        i.  An alignment pin with the same sex as the connector is
            installed nearest to pin-1, module-1 (to facilitate locating
            pin-1, module-1 during trouble-shooting and low-visibility
            conditions).

        ii. A second, opposite sex alignment pin is diagonally opposite
            (to facilitate reliable connector mating low-visibility
            conditions).

# Heater ConnectorS

The LARP convention (power and information out the female) requires that
the magnet's heater connections be male, while voltage-tap and
low-voltage diagnostic connectors be female. The magnet side of the
Heater-interface" connector (Fig.1) is representative of the type of
high-voltage interface connector that must be matched by the magnet's
coil connector-modules (when they exist).

Table 1 illustrates the voltage-tap and heater pin assignment table that
is provided by the magnet mfg. Accompanying circuit schematics (e.g.,
Fig. 4) are expected to unambiguously show the electrical relationship
between all devices and all nearby relevant magnet elements, and the
interface connector pins. Physical layout maps (e.g., Fig. 5, 6) and/or
photos are expected to unambiguously show the mechanical relationship
between all devices and all nearby relevant magnet elements. How the
pins are associated with test-facility signals is determined by the test
facility and is documented in a subsequent signal tables. Explicit
signal requests must be negotiated with the test-facility.

![](media/image1.wmf)

####### FIGURE 1: FNAL's Heater Connector Layout. Magnet side uses male (pins). Modules are numbered according to the Hypertronics convention.

####### 

####### TABLE 1: A Hypertronic Magnet-Plug Pin Assignment Table. Wires are grouped into pairs whenever possible, with the lower pin-# of a pair being the (+) signal voltage/current, the second being its reference or return.

+---------------+-------------------------------+-------+-------+-----+
| **Schematic   | **Magnet tap/wire color/label | *     | **Mod | *   |
| Wire label**  | ID**                          | *Wire | ule** | *Pi |
|               |                               | Co    |       | n** |
|               |                               | lor** | *     |     |
|               |                               |       | *\#** | **\ |
|               |                               |       |       | #** |
+---------------+-------------------------------+-------+-------+-----+
| H             | S.heater Coil-A Outer I+      | Red-Y | 1     | 1   |
| Aouter.spotI+ |                               |       |       |     |
+---------------+-------------------------------+-------+-------+-----+
| H             | " " I-                        | Blk-Y | 1     | 2   |
| Aouter.spotI- |                               |       |       |     |
+---------------+-------------------------------+-------+-------+-----+
| H             | " " V+                        |       | 1     | 3   |
| Aouter.spotV+ |                               |       |       |     |
+---------------+-------------------------------+-------+-------+-----+
| H             | " " V-                        |       | 1     | 4   |
| Aouter.spotV- |                               |       |       |     |
+---------------+-------------------------------+-------+-------+-----+
|               |                               |       |       | 5   |
+---------------+-------------------------------+-------+-------+-----+
| HAouterI+     | Q.heater Coil-A Outer I+      | Red   | 5     | 1   |
+---------------+-------------------------------+-------+-------+-----+
| HAouterI-     | " " I-                        | Blk   | 5     | 2   |
+---------------+-------------------------------+-------+-------+-----+
| HBouterI+     | Q.heater Coil-B Outer I+      | Red-W | 6     | 1   |
+---------------+-------------------------------+-------+-------+-----+
| HBouterI-     | " " I-                        | Blk-W | 6     | 2   |
+---------------+-------------------------------+-------+-------+-----+
|               |                               |       |       |     |
+---------------+-------------------------------+-------+-------+-----+
|               |                               |       |       |     |
+---------------+-------------------------------+-------+-------+-----+
|               |                               |       |       |     |
+---------------+-------------------------------+-------+-------+-----+
|               |                               |       |       |     |
+---------------+-------------------------------+-------+-------+-----+
|               |                               |       |       |     |
+---------------+-------------------------------+-------+-------+-----+

# Voltage-Tap Connectors

Figure 2 illustrates a coil-module's V-tap (female) connector layout.
The magnet builder is expected to wire each connector's pins and modules
in a manner whereby higher pin-#'s and higher module-#'s always have
higher (or equal) 300K resistance relative to the magnet's reference
(negative) terminal. The modular arrangement shown in Fig. 2 allows up
to 20 (or 40) V-taps/coil. Excess coil V-taps may spill into an adjacent
coil's connector, provided the sequential voltage rule is obeyed. All
departures from the sequential voltage rule must be explicitly noted and
negotiated with the relevant test facility, as they may increase the
cost of test preparation and signal debugging.

Table 2 shows a typical voltage-tap wiring table that explicitly details
the wiring path from voltage-tap in the magnet to a pin in a module of
an interface connector. Accompanying circuit schematics (e.g., Fig. 4)
are expected to unambiguously show the electrical relationship between
all devices and all nearby relevant magnet elements, and the interface
connector pins. Physical layout maps (e.g., Fig. 5, 6) and/or photos are
expected to unambiguously show the mechanical relationship between all
devices and all nearby relevant magnet elements. The method of
monitoring "½-magnet", "¼ magnet"\... imbalance voltages is at the
discretion of the test facility (unless otherwise negotiated
beforehand).

![](media/image2.wmf)

####### FIGURE 2: Voltage Tap Connector Layout (solder-cup view of female)

####### TABLE 2: TQS01 Coil-A's Voltage-Tap Connector Wire/Pin Assignment Table

+--------------+--------------------------------+-------+-------+----+
| **Schematic  | **V-Tap Location/Description** | *     | **Mod | *  |
| Wire Label** |                                | *Wire | ule** | *P |
|              |                                | Co    |       | in |
|              |                                | lor** | *     | ** |
|              |                                |       | *\#** |    |
|              |                                |       |       | ** |
|              |                                |       |       | \# |
|              |                                |       |       | ** |
+--------------+--------------------------------+-------+-------+----+
| VA101        | Coil-A Layer-1,Splice-Ti       | Blk   | 1     | 1  |
+--------------+--------------------------------+-------+-------+----+
| VA102        | Coil-A Layer-1,Splice-Sn       | Wht   | 1     | 2  |
+--------------+--------------------------------+-------+-------+----+
| VA103        | "" Layer-1 Turn-16 Lead-side   | Red   | 1     | 3  |
+--------------+--------------------------------+-------+-------+----+
| VA104        | "" Layer-1 Turn-1 Lead-end     | Blu   | 1     | 4  |
+--------------+--------------------------------+-------+-------+----+
| VA105        | "" Layer-1 Turn-1 Ret-end      | Yel   | 1     | 5  |
+--------------+--------------------------------+-------+-------+----+
| VA106        | "" Layer-1 Turn-1 Ramp         | Grn   | 2     | 1  |
+--------------+--------------------------------+-------+-------+----+
| VA206        | "" Layer-2 Turn-1 Ramp         | Blk-W | 2     | 2  |
+--------------+--------------------------------+-------+-------+----+
| VA205        | Layer-2 Turn-1 Ret-end         | W     | 2     | 3  |
|              |                                | ht-Bk |       |    |
+--------------+--------------------------------+-------+-------+----+
| VA204        | Layer-2 Turn-1 Lead-end        | Red-W | 2     | 4  |
+--------------+--------------------------------+-------+-------+----+
| VA203        | Layer-2 Turn-21 Lead-side      | Blu-W | 2     | 5  |
+--------------+--------------------------------+-------+-------+----+
| VA202        | Coil-A Layer-1,Splice-Sn       | Y     | 3     | 1  |
|              |                                | el-Bk |       |    |
+--------------+--------------------------------+-------+-------+----+
| VA201        | Coil-A Layer-1,Splice-Ti       | Grn-W | 3     | 2  |
+--------------+--------------------------------+-------+-------+----+
|              |                                |       | 3     | 3  |
+--------------+--------------------------------+-------+-------+----+
|              |                                |       | 3     | 4  |
+--------------+--------------------------------+-------+-------+----+
|              |                                |       | 3     | 5  |
+--------------+--------------------------------+-------+-------+----+
|              |                                |       | 4     | 1  |
+--------------+--------------------------------+-------+-------+----+
|              |                                |       | 4     | 2  |
+--------------+--------------------------------+-------+-------+----+
|              |                                |       | 4     | 3  |
+--------------+--------------------------------+-------+-------+----+
|              |                                |       | 4     | 4  |
+--------------+--------------------------------+-------+-------+----+
|              |                                |       | 4     | 5  |
+--------------+--------------------------------+-------+-------+----+
|              |                                |       |       |    |
+--------------+--------------------------------+-------+-------+----+

# Low Voltage (Strain-Gauge & RTD) Connectors

All low voltage connectors are constructed from one or more 17-pin
Hypertronic module(s) (Fig. 3). The magnet side is female. Each 17-pin
module accommodates 8-twisted pairs, with the 17^th^ pin available to
continue any shield (if desired). Each unit (each module and each
connector) is expected to be unambiguously labeled with a name that
indicates it coil origin and relative sequence (if there is more than
one module/connector per coil). If power is supplied by a module,
pins 1 & 2 are reserved for I+ & I-, respectively. If additional power
is supplied, the first two pins in the new set supply the power, and are
appropriately indicated in the wire-table (Table 3). Accompanying
circuit schematics (e.g., Fig. 4) are expected to unambiguously show the
electrical relationship between all devices and all nearby relevant
magnet elements, and the interface connector pins. Physical layout maps
(e.g., Fig. 5, 6) and/or photos are expected to unambiguously show the
mechanical relationship between all devices and all nearby relevant
magnet elements. External (e.g., series/parallel) connections are the
responsibility of the test facility.

![](media/image3.wmf)

####### FIGURE 3: Strain Gauge Connector Layout

####### TABLE 3: Example of a Strain-Gauge Connector Wire/Pin Assignment Table

+---------------+----------------------------+-------+--------+------+
| **Schematic   | **Functional               | *     | **Mo   | **P  |
| Wire Label**  | location-description**     | *Wire | dule** | in** |
|               |                            | Co    |        |      |
|               |                            | lor** | **\#** | **   |
|               |                            |       |        | \#** |
+---------------+----------------------------+-------+--------+------+
| SG0101I+      | I+ for coil-01 SG-01       | Blk   | 1      | 1    |
+---------------+----------------------------+-------+--------+------+
| SG0101I-      | I- for coil-01 SG-01       | Wht   | 1      | 2    |
+---------------+----------------------------+-------+--------+------+
| SG0101V+      | V+ for coil-01 SG-01       | Red   | 1      | 3    |
+---------------+----------------------------+-------+--------+------+
| SG0101V-      | V- for coil-01 SG-01       | Blu   | 1      | 4    |
+---------------+----------------------------+-------+--------+------+
| SG0102I+      | I+ for coil-01 SG-01       | Blk   | 1      | 5    |
+---------------+----------------------------+-------+--------+------+
| SG0102I-      | I- for coil-01 SG-01       | Wht   | 1      | 6    |
+---------------+----------------------------+-------+--------+------+
| SG0102V+      | V+ for coil-01 SG-01       | Red   | 1      | 7    |
+---------------+----------------------------+-------+--------+------+
| SG0102V-      | V- for coil-01 SG-01       | Blu   | 1      | 8    |
+---------------+----------------------------+-------+--------+------+
| TS0101I+      | I+ for coil-01 TS-01       | Blk   | 1      | 9    |
+---------------+----------------------------+-------+--------+------+
| TS0101I-      | I- for coil-01 TS-01       | Wht   | 1      | 10   |
+---------------+----------------------------+-------+--------+------+
| TS0101V+      | V+ for coil-01 TS-01       | Red   | 1      | 11   |
+---------------+----------------------------+-------+--------+------+
| TS0101V-      | V- for coil-01 TS-01       | Blu   | 1      | 12   |
+---------------+----------------------------+-------+--------+------+
| TS0102I+      | I+ for coil-01 TS-01       | Blk   | 1      | 13   |
+---------------+----------------------------+-------+--------+------+
| TS0102I-      | I- for coil-01 TS-01       | Wht   | 1      | 14   |
+---------------+----------------------------+-------+--------+------+
| TS0102V+      | V+ for coil-01 TS-01       | Red   | 1      | 15   |
+---------------+----------------------------+-------+--------+------+
| TS0102V-      | V- for coil-01 TS-01       | Blu   | 1      | 16   |
+---------------+----------------------------+-------+--------+------+
| **EMPTY**     |                            |       | 1      | 17   |
+---------------+----------------------------+-------+--------+------+
| SG0201I+      | I+ for coil-02 SG-01       | Blk   | 2      | 1    |
+---------------+----------------------------+-------+--------+------+
| SG0201I-      | I- for coil-02 SG-01       | Wht   | 2      | 2    |
+---------------+----------------------------+-------+--------+------+
| SG0201V+      | V+ for coil-02 SG-01       | Red   | 2      | 3    |
+---------------+----------------------------+-------+--------+------+
| SG0201V-      | V- for coil-02 SG-01       | Blu   | 2      | 4    |
+---------------+----------------------------+-------+--------+------+
| SG0202I+      | I+ for coil-02 SG-01       | Blk   | 2      | 5    |
+---------------+----------------------------+-------+--------+------+
| SG0202I-      | I- for coil-02 SG-01       | Wht   | 2      | 6    |
+---------------+----------------------------+-------+--------+------+
| SG0202V+      | V+ for coil-02 SG-01       | Red   | 2      | 11   |
+---------------+----------------------------+-------+--------+------+
| SG0202V-      | V- for coil-02 SG-01       | Blu   | 2      | 10   |
+---------------+----------------------------+-------+--------+------+
| TS0201I+      | I+ for coil-02 TS-01       | Blk   | 2      | 9    |
+---------------+----------------------------+-------+--------+------+
| TS0201I-      | I- for coil-02 TS-01       | Wht   | 2      | 8    |
+---------------+----------------------------+-------+--------+------+
| TS0201V+      | V+ for coil-02 TS-01       | Red   | 2      | 7    |
+---------------+----------------------------+-------+--------+------+
| TS0201V-      | V- for coil-02 TS-01       | Blu   | 2      | 12   |
+---------------+----------------------------+-------+--------+------+
| Ts0202I+      | I+ for coil-02 TS-01       | Blk   | 2      | 13   |
+---------------+----------------------------+-------+--------+------+
| Ts0202-       | I- for coil-02 TS-01       | Wht   | 2      | 14   |
+---------------+----------------------------+-------+--------+------+
| Ts0202V+      | V+ for coil-02 TS-01       | Red   | 2      | 15   |
+---------------+----------------------------+-------+--------+------+
| Ts0202V-      | V- for coil-02 TS-01       | Blu   | 2      | 16   |
+---------------+----------------------------+-------+--------+------+
| **EMPTY**     |                            |       | 2      | 17   |
+---------------+----------------------------+-------+--------+------+

# Schematics AND MAPS

Figure 4 illustrates a coil wiring sequence, and how voltage-taps are
wired to an interface connector at FNAL. Similar schematics are needed
for the all devices, so the appropriate meaning and significance can be
determined and assigned to the signals that are recorded.

![](media/image4.wmf)

####### FIGURE 4: Fixed Voltage Taps, Twisted Pair & Connector-Pin Assignments at FNAL.

Pictures and maps with readable, reliable labels are worth a thousand
words of description (Fig.5, 6).

####### ![](media/image5.wmf)

####### FIGURE 5: Physical map of voltage taps, and heater layout for layer-2 of LBNL TQ01 quadrupole coil.

![](media/image6.wmf)

####### FIGURE 6: Enlarged physical map of lead-end voltage-taps shown in Fig. 5.