eprobe data

This work investigates an innovative magnetic field probe especially suitable but not limited to the characterization of insertion devices for light sources such as undulators and wigglers. Examples of such systems include the undulators planned for the Advanced Light Source Upgrade (ALS-U), where a complete magnetic characterization of the device is an integral part of their construction and certification. Current magnetic field measurement technologies for such hardware include Hall effect probes, wire-based systems, and sensing coils. This work simulates and validates this novel sensing technology based on a micro–Cathode Ray Tube (mCRT) integrated with an image sensor. This magnetometer utilizes an electron beam that emulates the actual beam traversing the insertion device when in operation but with lower energy. The micro cathode-ray tube shoots a stream of electrons at the imager mounted perpendicularly to the beam and located at the opposite end of the tube. Electrostatic plates are used to enhance the performance of the magnetic probe by bringing the beam spot back to the imager when it goes out of the boundary. The projected beam spot is dependent on the magnetic environment present at the beam path and can be translated to magnetic field measurements. With this unique approach, many limitations inherent to Hall probes are eliminated, resulting in a state-of-the-art magnetometer that will improve magnetic metrology in the future.