Characterizing the emittance contribution due to rotated quadrupoles and canonical angular momentum using the quadrupole scan technique in electron accelerators
Be. Carlsten, Characterizing the emittance contribution due to rotated quadrupoles and canonical angular momentum using the quadrupole scan technique in electron accelerators, REV SCI INS, 70(3), 1999, pp. 1672-1683
Standard emittance measurement techniques for bright electron beams are eit
her insensitive to the emittance due to correlated effects like misaligned
quadrupoles or a nonzero axial magnetic field at the cathode, or are unable
to differentiate that emittance from the beam's intrinsic emittance corres
ponding to the beam's actual entropy. We describe a technique based on the
standard quadrupole scan, in which the beam correlations leading to emittan
ce growth can be directly measured, and the emittance from these correlatio
ns can be found for special cases. (C) 1999 American Institute of Physics.
[S0034-6748(99)02603-9].