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12.1 Introduction to compressors theory

Figure 12.1: Evolution of a bunch though a compressor. The path of the particles of low momentum is longer than the ones of high momentum. Thus, if the initial distribution has a negative corelation between position and energy, this correlation will be reduced as the high momentum tail will travel along a smaller distance than the head, catching up with the head of the distribution. For a given correlated energy spread, the compression will be minimal. As we go far from this point, overcompression occurs.
Image dipoleNRJspread
Figure 12.2: Scheme of a compressor made of 4 dipoles and corresponding sign of the magnetic fields
Image compressor

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Emmanuel Branlard