Monitoring High Energy Proton Beams by Narrow-Band Synchrotron Radiation

We consider the possibility of monitoring spatial distribution and energy of very high energy proton beams in storage rings (or synchrotrons) by the visible narrow-band synchrotron radiation they should emit in transverse, static, spatially periodic magnetic fields. More than 1011 visible photons per second per milliradian would be emitted by a 400 GeV - 6 A beam in a 5 meters long 300 Gauss field with a period of 13 cm.