Abstract:A device has been designed and built to obtain the four dimensional emittance of a particle beam. Two rotating discs with hole patterns scan the beam using the Nipkov principle. The emittance is deter...A device has been designed and built to obtain the four dimensional emittance of a particle beam. Two rotating discs with hole patterns scan the beam using the Nipkov principle. The emittance is determined from 10.000 beam samples, each of which is taken in 1 ms. Dependent on the chosen hole pattern a complete cycle of 10.000 samples takes 20-40 s. A small computer is used to control the experiment and to store the measurement data. Beam samples of 1 nA and up can be measured with 1% accuracy. The emittance of a particle beam can be described as a function in the four dimensional phase space: E(x,x',y,y'), with E = dI/dV, where x and y are mutually perpendiculat and transverse to the beam direction z, I is the beam current, dV a volume element in phase space, and x' = dx/dz, y' = dy/dz. A much used representation of the emittance is given by E(x,x') = ∫ Edydy', E(y,y') = ∫ Edxdx'. phase space phase spaceRead More
Publication Year: 1971
Publication Date: 1971-06-01
Language: en
Type: article
Indexed In: ['crossref']
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