Title :
Emittance measurement in a magnetic field
Author_Institution :
Lawrence Livermore Nat. Lab., California Univ., CA, USA
Abstract :
Emittance can be measured by intercepting an electron beam on a range thick plate and then observing the expansion of beamlets transmitted through small holes. The hole size is selected to minimize space charge effects. In the presence of a magnetic field the beamlets have a spiral trajectory and the usual field free formulation must be modified. To interpret emittance in the presence of a magnetic field an envelope equation is derived in the appropriate rotating frame.<>
Keywords :
electrodynamics; particle beam diagnostics; beamlets; electron beam; field free formulation; magnetic field; range thick plate; space charge effects; spiral trajectory; Contracts; Cyclotrons; Equations; Frequency; Laboratories; Magnetic analysis; Magnetic field measurement; Space charge; Spirals; Thickness measurement;
Conference_Titel :
Particle Accelerator Conference, 1991. Accelerator Science and Technology., Conference Record of the 1991 IEEE
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-0135-8
DOI :
10.1109/PAC.1991.164326
