**[1) More Voltage-Tap Channels (priority 1)]{.underline}**

1A) More Cryostat Access Wires:

+-----------------------+----------------------+----------------------+
| **Option**            | **Plus**             | **Minus**            |
+-----------------------+----------------------+----------------------+
| 1.  No change:        | -   No hassle, no    | -   Lose info on     |
|                       |     risk.            |     quench-origin.   |
+-----------------------+----------------------+----------------------+
| 2.  Add wires:        | -   No risk to       | -   More heat load,  |
|                       |     present system.  |     difficult.       |
+-----------------------+----------------------+----------------------+
| 3.  Replace           | -   Quick, cheap.    | -   More heat-load   |
|     "1.8K-direct      |                      |     to 1.8K.         |
|     wires" with more, |                      |                      |
|     smaller Cu wires: |                      |                      |
+-----------------------+----------------------+----------------------+
| 4.  Replace           | -   Less heat load   | -   Some bronze-wire |
|     "1.8K-direct      |     to 1.8K          |     risk.            |
|     wires" with more, |     reservoir.       |                      |
|     bronze wires:     |                      | -   No room for      |
|                       |                      |     strain-gage      |
|                       |                      |     wires.           |
+-----------------------+----------------------+----------------------+
| 5.  Replace all V-tap | -   Min. heat to     | -   Maximum          |
|     wires with        |     both systems.    |     bronze-wire      |
|     bronze.           |                      |     risk.            |
|                       | -   Room for         |                      |
|                       |     strain-gage      |                      |
|                       |     wires.           |                      |
+-----------------------+----------------------+----------------------+

Plan: Option #5, to minimize the anomalously large heat-load by the
maximum amount.

1B) More Amplifier Access Wires:

+-----------------------+----------------------+-----------------------+
| **Option**            | **Plus**             | **Minus**             |
+-----------------------+----------------------+-----------------------+
| 1.  No change:        | -   No hassle, no    | -   Lose info on      |
|                       |     risk.            |     quench-origin.    |
+-----------------------+----------------------+-----------------------+
| 2.  Add RG-58 wires:  | -   No risk to       | -   Bulky, not        |
|                       |     present system.  |     twisted-pairs.    |
|                       |                      |                       |
|                       |                      | -   Requires SHV      |
|                       |                      |     panel at cryostat |
|                       |                      |                       |
|                       |                      | -                     |
+-----------------------+----------------------+-----------------------+
| 3.  Replace RG-58     | -   Improve          | -   More work.        |
|     tangle with       |     signal/noise     |                       |
|     shielded twisted  |     ratio.           |                       |
|     wires:            |                      |                       |
+-----------------------+----------------------+-----------------------+

Plan: Option #3, to improve the chances of getting a meaningful measure
of the splice resistance.

1C) More Quench-Origin Amplifiers:

+-----------------------+----------------------+-----------------------+
| **Option**            | **Plus**             | **Minus**             |
+-----------------------+----------------------+-----------------------+
| 1.  No change:        | -   No hassle, no    | -   Lose info on      |
|                       |     risk.            |     quench-origin.    |
+-----------------------+----------------------+-----------------------+
| 2.  Add derivative    | -   Easy derivative  | -   New derivative    |
|     amplifiers:       |     data.            |     amplifiers:       |
|                       |                      |     made              |
|                       | -   High frequency   | /finished/calibrated. |
|                       |     data for free.   |                       |
+-----------------------+----------------------+-----------------------+
| 3.  Add old           | -   Some old         | -   More difficult    |
|     conventional      |     amplifiers       |     derivative info.  |
|     amplifiers:       |     available.       |                       |
+-----------------------+----------------------+-----------------------+
| 4.  Add SSC           | -   Won't have to    | -   May not come in   |
|     conventional      |     build or fix as  |     time.             |
|     amplifiers        |     many amplifiers. |                       |
|                       |                      | -   Some extra work   |
|                       |                      |     to utilize.       |
+-----------------------+----------------------+-----------------------+

Plan: A combination of options 2, 3, 4, to minimize the effort required
to get a full set of data.

1D) Splice Amplifiers:

+-----------------------+----------------------+-----------------------+
| **Option**            | **Plus**             | **Minus**             |
+-----------------------+----------------------+-----------------------+
| 1.  Use conventional  | -   Min. hassle,     | -   Probably no       |
|     amplifiers:       |     min. cost.       |     splice info .     |
+-----------------------+----------------------+-----------------------+
| 2.  Install high-gain | -   Improved chances | -   Additional        |
|     amplifiers        |     of getting       |     equipment and     |
|     immediately above |     readable signal. |     maintenance       |
|     cryostat:         |                      |     costs.            |
+-----------------------+----------------------+-----------------------+
| 3.  Install high-gain | -   Best             | -   Additional        |
|     amplifiers inside |     signal/noise     |     equipment and     |
|     cryostat:         |     ratio.           |     maintenance       |
|                       |                      |     costs.            |
+-----------------------+----------------------+-----------------------+

Plan: Option #2, with a high amplifier gain (G \> 1000) and easy
(remote) offset adjustment.

1E) More Data-Logger Channels:

+-----------------------+---------------------+------------------------+
| **Option**            | **Plus**            | **Minus**              |
+-----------------------+---------------------+------------------------+
| 1.  Live with 64      | -   Min. hassle,    | -   Lose info on       |
|     channels:         |     min. cost.      |     quench-origin.     |
+-----------------------+---------------------+------------------------+
| 2.  Install a third   | -   Full 96 channel | -   Need DAQ/Viewer    |
|     block:            |     capability.     |     channel capacity   |
|                       |                     |     upgrade.           |
+-----------------------+---------------------+------------------------+
| 3.  Install a third   | -   Best chance of  | -   Above , plus       |
|     block plus        |     maintaining     |     additional storage |
|     back-up           |     full capability |     and transfer       |
|     capability:       |     during test.    |     costs.             |
+-----------------------+---------------------+------------------------+

Plan: Option #3, for maximum insurance against hardware failure; but
settle for option #2.

1F) Data-Acquisition Upgrade:

+-----------------------+---------------------+------------------------+
| **Option**            | **Plus**            | **Minus**              |
+-----------------------+---------------------+------------------------+
| 1.  Collect only      | -   Min. hassle,    | -   Lose info on       |
|     channels 1-64:    |     min. cost.      |     quench-origin.     |
+-----------------------+---------------------+------------------------+
| 2.  Acquire a third   | -   Full 96 channel | -   More data-storage  |
|     data-block with   |     capability.     |     space used.        |
|     GETDATA:          |                     |                        |
|                       |                     | -   Minor software     |
|                       |                     |     modifications.     |
+-----------------------+---------------------+------------------------+
| 3.  Acquire all V-tap | -   Windows         | -   Major software     |
|     data via LabView: |     capability.     |     modifications.     |
|                       |                     |                        |
|                       | -   Test future     |                        |
|                       |     capability now. |                        |
+-----------------------+---------------------+------------------------+

Plan: Option #2, to minimize the effort to store all the data.

1G) Data-Viewer Upgrade:

+-----------------------+---------------------+------------------------+
| **Option**            | **Plus**            | **Minus**              |
+-----------------------+---------------------+------------------------+
| 1.  View only         | -   Min. hassle,    | -   Lose info on       |
|     channels 1-64:    |     min. cost.      |     quench-origin.     |
+-----------------------+---------------------+------------------------+
| 2.  Read 64 channels  | -   Minimum         | -   Probably           |
|     at a time:        |     software        |     inconvenient.      |
|                       |     change.         |                        |
+-----------------------+---------------------+------------------------+
| 3.  Read 96 channels  | -   Convenient data | -   No QBX capability  |
|     at a time:        |     access.         |     likely.            |
+-----------------------+---------------------+------------------------+
| 4.  Read all V-tap    | -   Windows         | -   Major software     |
|     data via LabView: |     capability.     |     modifications.     |
|                       |                     |                        |
|                       | -   Test future     |                        |
|                       |     capability now. |                        |
+-----------------------+---------------------+------------------------+

Plan: Option #3, to minimize the effort to read all the data; settle for
option #2.

**[2) More Strain-Gage Channels (priority 1)]{.underline}**

2A) More Cryostat Access Wires:

+-----------------------+---------------------+------------------------+
| **Option**            | **Plus**            | **Minus**              |
+-----------------------+---------------------+------------------------+
| 1.  No change:        | -   Min. hassle,    | -   Lose info on coil  |
|                       |     min. cost.      |     strains, or lose   |
|                       |                     |     cryostat           |
|                       |                     |     diagnostics.       |
+-----------------------+---------------------+------------------------+
| 2.  Add wires:        | -   No risk to      | -   More heat load,    |
|                       |     present system. |     difficult.         |
+-----------------------+---------------------+------------------------+
| 3.  Replace           | -   Quick, cheap.   | -   More heat-load to  |
|     "1.8K-direct      |                     |     1.8K.              |
|     wires" with more, |                     |                        |
|     smaller Cu wires: |                     |                        |
+-----------------------+---------------------+------------------------+
| 4.  Replace           | -   Less heat load  | -   Some bronze-wire   |
|     "1.8K-direct      |     to 1.8K         |     risk.              |
|     wires" with more, |     reservoir.      |                        |
|     bronze wires:     |                     |                        |
+-----------------------+---------------------+------------------------+
| 5.  Run all S-gage    | -   Min. heat to    | -   Maximum            |
|     wires along-side  |     both systems.   |     bronze-wire risk.  |
|     new bronze V-tap  |                     |                        |
|     wires.            | -   Neatest 300K    |                        |
|                       |     transition.     |                        |
+-----------------------+---------------------+------------------------+

Plan: Option #5, to minimize the total heat-load to 1.8K and 4.5K
systems.

**2B) More Scanner Access Wires: (Ready for testing)**

**2C) More Scanner DAQ-Channels: (Ready for testing)**

**2D) More Scanner Read-Channels: (Ready for testing)**

**[3) More Temperature Channels (priority 2)]{.underline}**

**3A) More Cryostat Access Wires: (same as strain-gage)**

**3B) More Scanner Access Wires: (same as strain-gage)**

3C) More Scanner DAQ-Channels:

+---------------------+-----------------------+-----------------------+
| **Option**          | **Plus**              | **Minus**             |
+---------------------+-----------------------+-----------------------+
| 1.  No change:      | -   Min. hassle, min. | -   Borrow channels.  |
|                     |     cost.             |                       |
+---------------------+-----------------------+-----------------------+
| 2.  Add another     | -   Get full signal   | -   More data,        |
|     scanner:        |     complement.       |                       |
|                     |                       | -   Slower DAQ.       |
|                     |                       |                       |
|                     |                       | -   DAQ software      |
|                     |                       |     upgrade.          |
+---------------------+-----------------------+-----------------------+

Plan: Option #2, for maximum data.

**[4) Magnet Transport/Restraint System (priority 1)]{.underline}**

4A) 2000 Pound Pusher/Puller:

+---------------------+-----------------------+-----------------------+
| **Option**          | **Plus**              | **Minus**             |
+---------------------+-----------------------+-----------------------+
| 1.  Ball screw:     | -   Easy              | -   Bulky (1.5x       |
|                     |     power-assist.     |     magnet length).   |
|                     |                       |                       |
|                     | -   Easy direction    | -   Interference with |
|                     |     reversal.         |     diagnostics.      |
|                     |                       |                       |
|                     | -   No forces on      | -   Pushing???        |
|                     |     sealing surfaces. |                       |
|                     |                       | -   Reach???          |
+---------------------+-----------------------+-----------------------+
| 2.  Block & Tackle: | -   Useable for B58   | -   Cumbersome.       |
|                     |     transport.        |                       |
|                     |                       | -   Danger to         |
|                     |                       |     diagnostics.      |
+---------------------+-----------------------+-----------------------+
| 3.  Come-Along:     | -   Small space       | -   Cumbersome.       |
|                     |     requirement.      |                       |
|                     |                       | -   Protection for    |
|                     | -   Useable for B58   |     sealing surface.  |
|                     |     transport.        |                       |
+---------------------+-----------------------+-----------------------+
| 4.  Electric winch: | -   Convenient        | -   More expensive.   |
|                     |     operation.        |                       |
|                     |                       |                       |
|                     | -   Useable for B58   |                       |
|                     |     transport.        |                       |
+---------------------+-----------------------+-----------------------+

Plan: Option #4, for maximum ease and flexibility. Winch is capable of
being bolted to the floor or the cryostat.

4B) 90-Degree Transport Capability:

+---------------------+-----------------------+------------------------+
| **Option**          | **Plus**              | **Minus**              |
+---------------------+-----------------------+------------------------+
| 1.  Present cart &  | -   Min. hassle, min. | -   No 90 degree       |
|     pry-bars:       |     cost.             |     capability.        |
+---------------------+-----------------------+------------------------+
| 2.  Leap-frogging   | -                     | -   Leap-frogging      |
|     ball plates,    |    Multi-directional. |     ball-plates.       |
|     with winch:     |                       |                        |
|                     | -   Minimal friction. | -   Rolls too easily.  |
|                     |                       |                        |
|                     |                       | -   Hard to control    |
|                     |                       |     direction.         |
|                     |                       |                        |
|                     |                       | -   Leap-frogging      |
|                     |                       |     ground-plates.     |
+---------------------+-----------------------+------------------------+
| 3.  Steerable,      | -   Steerable.        | -   Steering coord.    |
|     corner-mounted  |                       |     required??         |
|     roller-wheels,  | -   Safer.            |                        |
|     with winch:     |                       | -   Steering causes    |
|                     | -   Easy height/angle |     translation??      |
|                     |     adjustment.       |                        |
|                     |                       | -   Leap-frogging      |
|                     |                       |     ground-plates.     |
+---------------------+-----------------------+------------------------+

Plan: Option #3, with electric or drill-operated winch.

4C) Angle/Height Mating Adjustment System:

+---------------------+-----------------------+------------------------+
| **Option**          | **Plus**              | **Minus**              |
+---------------------+-----------------------+------------------------+
| 1.  Shims &         | -   Min. change, min. | -   Time consuming.    |
|     pry-bars:       |     cost.             |                        |
|                     |                       | -   Dangerous??        |
+---------------------+-----------------------+------------------------+
| 2.  Two (front)     | -   Easy height       | -   Imprecise          |
|     jacking screws: |     adjustment.       |     transverse adjust. |
+---------------------+-----------------------+------------------------+
| 3.  Corner jacking  | -   Relatively easy   | -   "Stumbling"        |
|     screws on       |     transverse        |     problem??          |
|     independent     |     movement.         |                        |
|     roller-plates:  |                       |                        |
|                     | -   Easy height       |                        |
|                     |     adjustment.       |                        |
+---------------------+-----------------------+------------------------+
| 4.  Corner jacking  | -   Less "stumbling   | -   More parts.        |
|     screws on       |     problem.          |                        |
|     railed          |                       |                        |
|     roller-plates:  |                       |                        |
+---------------------+-----------------------+------------------------+

Plan: Option #3, for maximum adjustment capability, with #4 as a
back-up.

4D) Insertion/Removal Friction Reduction Alterations:

+---------------------+-----------------------+------------------------+
| **Option**          | **Plus**              | **Minus**              |
+---------------------+-----------------------+------------------------+
| 1.  No change:      | -   Min. hassle, min. | -   Excessive          |
|                     |     cost.             |     friction.          |
|                     |                       |                        |
|                     |                       | -   Potential          |
|                     |                       |     insertion delay.   |
+---------------------+-----------------------+------------------------+
| 2.  Third rail:     | -   Potentially less  | -   Requires rework of |
|                     |     friction.         |     cryo-              |
|                     |                       | diagnostics/protection |
|                     |                       |     system.            |
|                     |                       |                        |
|                     |                       | -   New parts needed.  |
+---------------------+-----------------------+------------------------+
| 3.  Reassemble      | -   Potentially less  | -   Considerable       |
|     present rails   |     friction.         |     labor.             |
|     with thrust     |                       |                        |
|     washers:        |                       | -   Danger to          |
|                     |                       |     diagnostics.       |
|                     |                       |                        |
|                     |                       | -   Protection for     |
|                     |                       |     sealing surface.   |
+---------------------+-----------------------+------------------------+
| 4.  Replace         | -   Potentially less  | -   New parts needed.  |
|     cylinder        |     friction.         |                        |
|     rollers with    |                       |                        |
|     balls in a      | -   Self aligning.    |                        |
|     groove:         |                       |                        |
+---------------------+-----------------------+------------------------+

Plan: Evaluate present system with 2000# LBQF1. Extrapolate to D20 and
modify as needed to stay below 1500# pull. Evaluate extrapolation
assumptions with D19B (5000#).

4E) Seismic Restraint:

+---------------------+-----------------------+-----------------------+
| **Option**          | **Plus**              | **Minus**             |
+---------------------+-----------------------+-----------------------+
| 1.  Current (frozen | -   Min. hassle, min. | -   Danger to         |
|     grease):        |     cost.             |     end-domes.        |
+---------------------+-----------------------+-----------------------+
| 2.  Pinned, hard    | -   Relatively easy.  | -   Rail damage with  |
|     end-stops:      |                       |     big quake.        |
+---------------------+-----------------------+-----------------------+
| 3.  Pinned,         | -   Less rail         | -   Locate springs    |
|     end-stop        |     damage??          |                       |
|     springs:        |                       |                       |
+---------------------+-----------------------+-----------------------+

Plan: Option #3, for maximum safety; but settle for #2.

**[5) Miscellaneous Improvements:]{.underline}**

5A) North-End Extension Umbilical (priority 3)

+---------------------+-----------------------+-----------------------+
| **Option**          | **Plus**              | **Minus**             |
+---------------------+-----------------------+-----------------------+
| 1.  No change:      | -   Min. Hassle; Min. | -   More labor and    |
|                     |     effort.           |     risk every magnet |
|                     |                       |     change.           |
+---------------------+-----------------------+-----------------------+
| 2.  North-end       | -   Less magnet       | -   Lacks             |
|     access only:    |     change            |     flexibility.      |
|                     |     labor/risk.       |                       |
+---------------------+-----------------------+-----------------------+
| 3.  Mirror image:   | -   Less magnet       | -   More effort       |
|                     |     change            |                       |
|                     |     labor/risk.       | -   Less north end    |
|                     |                       |     radial clearance. |
|                     | -   Maximum           |                       |
|                     |     flexibility       |                       |
+---------------------+-----------------------+-----------------------+

Plan: Option #3, for maximum ease and flexibility.

5B) LHe Displacer (priority 3)

+---------------------+-----------------------+-----------------------+
| **Option**          | **Plus**              | **Minus**             |
+---------------------+-----------------------+-----------------------+
| 1.  No change:      | -   Min. Hassle; Min. | -   Expensive if no   |
|                     |     Effort.           |     user ready.       |
|                     |                       |                       |
|                     |                       | -   Slow sub-cooling. |
+---------------------+-----------------------+-----------------------+
| 2.  Logs of Stycast | -   Recovers capital  | -   Might fail.       |
|     coated          |     investment.       |                       |
|     ping-pong       |                       | -   Not optimum       |
|     balls:          |                       |     displacer.        |
+---------------------+-----------------------+-----------------------+
| 3.  Logs of         | -   Better displacer. | -   More cost.        |
|     teflon-sealed   |                       |                       |
|     tubing:         | -   Auto-pressure     |                       |
|                     |     relief.           |                       |
+---------------------+-----------------------+-----------------------+
| 4.  Logs of         | -   Best displacer.   | -   More cost.        |
|     teflon-sealed   |                       |                       |
|     hexagonal       | -   Auto-pressure     |                       |
|     tubing:         |     relief.           |                       |
+---------------------+-----------------------+-----------------------+

Plan: Option #3, for maximum ease and flexibility.

**[6) Cryo-System Maintenance]{.underline}**

**[6A) Priority 1:]{.underline}**

1.  Install two check-valves down-stream from Auto Kick-Back regulator.

2.  Fix leak detector.

3.  Check/replace belts on sub-cooling pump.

4.  Prepare 80K bed.

5.  Fix east ion-gage.

6.  Check WX leak-rates.

7.  Check DX leak-rates.

**[6B) Priority 2:]{.underline}**

1.  Change compressor room R-V from 5psi to 10 psi.

2.  Add vacuum relief valve around roughing pump.

3.  Graph data from subcooling system flow-test.

4.  Graph data from cryo system pressurized leak-test.

5.  Assemble spare DX.

6.  Update procedural manual.

7.  Install DX hydraulic pressure transducers.

**[6C) Priority 3:]{.underline}**

1.  Install differential-pressure gauge across Make-Up filter.

2.  Improve LN control system.

3.  Calibrate each ion gage with its controller.

4.  Make protective box for Mag. Meas. bench.

5.  Change Make-Up regulator gauges to 100psi (max.).

6.  Repair leak in DX hydraulic system; add oil.

7.  Record distance of dead-bands in LHe level gauges.

8.  Replace R-V's and gauges on roof-tanks.

**[7) DAQ-System Maintenance]{.underline}**

**[7A) Priority 1:]{.underline}**

1.  
2.  

**[7B) Priority 2:]{.underline}**

1.  
2.  

**[7C) Priority 3:]{.underline}**

1.  
2.  

**[8) Operating-System Maintenance]{.underline}**

**[8A) Priority 1:]{.underline}**

1.  
2.  

**[8B) Priority 2:]{.underline}**

1.  
2.  

**[8C) Priority 3:]{.underline}**

1.  
2.