FIBER OPTIC PARTICLE BEAM MONITOR

NON-INTRUSIVE BEAM MONITORS AND PRECISE INSTRUMENTS FOR CALIBRATING BEAM INTENSITY MONITORS WOULD BE OF TREMENDOUS VALUE IN HIGH ENERGY ACCELERATORS DURING ACCELERATOR OPERATIONS AND EXPERIMENTS. WE PROPOSE TO INITIATE A PROGRAM OF STUDY TO EVALUATE THE FEASIBILITY OF USING VERY RECENTLY DEMONSTRATED INTERFEROMETRIC FIBER OPTIC MAGNETIC TRANSDUCTION MECHANISMS IN A PRACTICAL INSTRUMENT FOR BEAM MONITORING. THIS INSTRUMENT WILL MEASURE THE SMALL MAGNETICFIELDS INDUCED BY THE CHARGED PARTICLE BEAMS AS AN INDIRECT MEASUREMENT OF THEIR CURRENTS. THE NOVEL ASPECT OF SUCH AN INSTRUMENT IS IN THE USE OF POTENTIALLY INEXPENSIVE FIBER OPTIC MAGNETIC SENSORS WHOSE SENSITIVITIES ARE PROJECTED TO SURPASS THAT OF THE MOST SENSITIVE EXISTING SENSORS. THE MOST IMMEDIATE ISSUE CONFRONTING THE APPLICATION IS A DETERMINATION OF THE SENSITIVITY LEVEL ACHIEVABLE WITH A FIBER OPTIC MAGNETIC SENSOR IN AN ACCELERATOR NOISE ENVIRONMENT FOR THE VARIATIONS IN WEAK MAGNETIC FIELDS CHARACTERISIC OF THE PARTICLE BEAMS. OUR INITIAL EFFORTS WILL BE DIRECTED TOWARD TESTING SOME NOISE REDUCTION SCHEMESIN OUR LABORATORY. THE RESULTS FROM THESE MEASUREMENTS, TOGETHER WITH INFORMATION ON THE NOISE CONDITIONS IN ACCELERATORS, WILL BE USED IN DESIGNING AND BUILDING AN INSTRUMENT IN PHASE II.