Small bore magnetic measurement system, method for measuring small bore magnets

1. A system for measuring magnets, the system comprising:

a) a guide tube removably received by a beam chamber tunnel, wherein said guide tube has a first end terminating at a first end of the tunnel and a second end terminating at a second end of the tunnel;

b) a flexible substrate slidably received by the tube, wherein the flexible substrate has a first end and a second end;

c) a first rotary stage removably attached to the first end of said flexible substrate and a second rotary stage removably attached to the second end of said flexible substrate wherein the first rotary stage and the second rotary stage effects movement of the substrate through the tube; and

d) a Hall probe supported by the flexible substrate.

2. The system as recited in claim 1 wherein the flexible substrate defines a scale.

3. The system as recited in claim 1 wherein the flexible substrate comprises a plurality of markings to be read by an encoder read head.

4. The system as recited in claim 3 wherein the first rotary stage comprises a torque motor and the second rotary stage comprises a servo motor, wherein the torque motor maintains tension to the flexible substrate and the servo motor is controlled by the encoder read head.

5. The system as recited in claim 1 wherein the guide tube defines a longitudinally extending void and the void is maintained at ambient temperature and pressure.

6. The system as recited in claim 1 wherein the guide tube is maintained at a first temperature that is higher than a second temperature of the beam chamber tunnel.

7. The system as recited in claim 1 wherein the beam chamber tunnel is housed in a cryostat.

8. The system as recited in claim 7 wherein the flexible substrate simultaneously passes through the beam chamber tunnel and outside the cryostat.

9. The system as recited in claim 1 wherein the guide tube defines a nonsymmetrical cross section.

10. The system as recited in claim 1 wherein the guide tube is adapted to receive a means for heating.

11. The system as recited in claim 1 wherein the guide tube is thermally insulated from the beam chamber tunnel.

12. A method for measuring magnetic fields, the method comprising:

a. removably inserting a guide tube into a magnetic core;

b. extending a measuring probe, supported on a flexible substrate having a first end and a second end, into the tube while maintaining the probe at ambient temperature and pressure; and

c. effecting movement of the substrate through the tube via a first rotary stage removably attached to the first end of said flexible substrate and a second rotary stage removably attached to the second end of said flexible substrate.

13. The method as recited in claim 12 wherein the magnetic core is maintained at temperatures between 0 K and 300 K.

14. The method as recited in claim 12 wherein the measuring probe is supported by a flexible substrate.

15. The method as recited in claim 12 wherein the measuring probe is supported by a flexible encoder scale.

16. The method as recited in claim 15 wherein the flexible encoder scale has a first end and a second end.

17. The method as recited in claim 16 wherein the first end is in rotatable communication with a torque motor take up reel and the second end is in rotatable communication with a servo motor take up reel.

18. The method as recited in claim 17 wherein the servo motor is supported by an x, y, z stage.

19. The method as recited in claim 18 wherein the stage and the flexible encoder scale each have a resolution of between 20 nanometers and 100 microns.

20. The method as recited in claim 12 wherein the magnetic core is enclosed in a cryostat.