DESIGN AND CONSTRUCTION OF A NOVEL 600-MHZ NMR MAGNET

THE LONG-TERM GOAL OF THIS RESEARCH IS TO PRODUCE A SHORTER GEOMETRY HIGH-FIELD MAGNET THAT WILL BE USEFUL TO THE IMAGING RESEARCHER AS WELL AS THE HIGH-RESOLUTION NMR SPECTROSCOPIST AT A LOWER COST THAN CURRENTLY AVAILABLE DESIGNS. ADVANCES IN NMR MICROSCOPY AND MR IMAGING OF SOLIDS DEMAND INCREASED FIELD STRENGTH FOR IMPROVEMENT OF THE SIGNAL-TO-NOISE RATIO AND, HENCE, INCREASED SENSITIVITY. DESIGN OF A SUPERCONDUCTING NB3SN INSERT FOR AN EXISTING NBTI OUTER MAGNET USING A NEW JOINTING TECHNIQUE WILL ENABLEA STABLE SHORT MAGNET TO EVOLVE. FOLLOWING FEASIBILITY STUDIES OF THE NEW JOINTING TECHNIQUE, THE PHASE II GOAL IS TO PRODUCE A 600-MHZ, 1-H-FREQUENCY MAGNET BASED ON A FOUR-COIL GEOMETRY RATHER THAN THE END-CORRECTED, SIXTH-ORDER LONG SOLENOID TRADITIONALLY USED FOR HIGH-RESOLUTION NMR MAGNETS. THE LARGER BORE OF THE FOUR-COIL GEOMETRY WILL PERMIT THE INSERTION OF GRADIENT COILS FOR IMAGING PURPOSES WHILE LEAVING REASONABLE SPACE FOR THE PROBE AND SAMPLE. A PREREQUISITE FOR THE FOUR-COIL GEOMETRY IS A SOLUTION TO THEOVERALL JOINT LENGTH PROBLEM.