Microtron
A microtron is a type of
In a microtron, due to the electrons' increasing momentum, the particle paths are different for each pass. The time needed for that is proportional to the pass number. The slow electrons need one electric field oscillation, the faster electrons need an integer multiple of this oscillation.
Racetrack microtron
A racetrack microtron is a larger-scale microtron which uses two electromagnets instead of one. Both electromagnets supply a homogeneous magnetic field in a half-circle formed region, and the particles path between both magnets is thus straight. One advantage of this is that the accelerator cavity can be larger, enabling the use of different
The linac is placed near the edge of the gap between the dee-shaped magnets. The remainder of the gap is used for focusing devices. The electron is readmitted to the linac after each revolution. This procedure can be repeated until the increasing radius of the particle's path makes further acceleration impossible. The particle beam is then deflected into an experiment area or a further accelerator stage. The world's largest racetrack-microtron is the Mainz Microtron.[3]
Applications
Microtrons provide high-energy electron beams with a low beam emittance (no radiation equilibrium) and a high repetition rate (equal to the operation frequency of the linac).
References
- S2CID 123023847.
- ^ Veksler, V.I. (1944). "A New Method of Accelerating Relativistic Particles" (PDF). Dokl. Akad. Nauk SSSR (in Russian). 43: 346–348.
- ^ (in German) MAMI-Prospectus, p. 13ff