Patent ID: 6972551

Claim:
In an energetic particle beam profile scanner having a probe constructed of a material that emits electrons when struck by the particle beam, a detection means for detecting the electrons emitted from the probe, and drive means for rotating the probe about an axis such that the probe passes through the particle beam at first and second positions along the particle beam axis, and wherein the probe provides two mutually perpendicular scans of the particle beam, the profile scanner further comprising: a second probe constructed of a material that emits electrons when struck by the particle beam, said detection means capable of detecting the electrons emitted from said second probe, said drive means capable of rotating said second probe about said axis such that said second probe passes through the particle beam at said first and second positions along the particle beam axis, said second probe providing two additional mutually perpendicular scans of the particle beam, such that two mutually perpendicular beam scans are obtained at said first position along the particle beam axis, and two mutually perpendicular beam scans are obtained at said second position along the particle beam axis.