Eric Prebys Accelerator Physics Center Fermilab 7/30/09.

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Presentation transcript:

Eric Prebys Accelerator Physics Center Fermilab 7/30/09

 Consider it axiomatic that some beam may be present anywhere in the admittance of the beam line  Historically very hard to predict or model.  Therefore, it’s important to have the beam admittance well defined by a collimation system, rather than rely on the limiting aperture of magnets, beam pipes, etc.  For the moment, assume that the defining admittance of the beam line is equal to the defining admittance of the collimation channel.  Assume gaussian shape for majority of beam  Usual FNAL 95% definition of emittance  Calculation not very sensitive to this 7/30/09 Mu2e Meeting 2

*al la FNAL-BEAM-DOC-2925 Beam fully extinguished when deflection equals twice full admittance (A) amplitude At collimator: At kicker: Full scale deflection Fraction of FS to extinguish 7/30/09 3 Mu2e Meeting

Phase space (live window  ): Full amplitude: Short live window -> large “extra” amplitude 7/30/09 4 Mu2e Meeting

 The amount of beam transmitted (or which hits the target) is given by  This can be expressed in a generic way as  Where Lateral displacement Half-aperture emittance admittance 7/30/09 5 Mu2e Meeting

7/30/09 6 Mu2e Meeting

 3 harmonic design of MECO  3 harmonics (1x, 2x, and 3x bunch rate) generate ~square wave.  Transmits at peak  Single harmonic design as in proposal  Runs at half of bunch rate  Transmits on the null  Modified sine wave  Add high harmonic to reduce slewing in transmission window.  Important questions  Transmission during 200 ns live window  Magnet design  Is second magnet necessary? 200 ns transmission window 7/30/09 7 Mu2e Meeting

 Normalized all waveforms to complete extinction at ±100 ns 7/30/09 8 Mu2e Meeting

7/30/09 9 Mu2e Meeting

 Our baseline design has significant issues with transmission efficiency unless bunches are very short (~10ns).  The MECO design is markedly superior in this regard.  A new proposal involving a small amount of 4.8MHz harmonic looks very promising.  In comparing the two proposals, consideration will be given to  Higher harmonic rate vs  Reduced number of harmonics and lower magnetic field. 7/30/09 Mu2e Meeting 10