Title :
Comments on the behavior of alpha 1 in main injector gamma /sub t/ jump schemes
Author :
Bogacz, S.A. ; Peggs, S.
Author_Institution :
Fermi Nat. Accel. Lab., Batavia, IL, USA
Abstract :
Tracking studies of transition crossing in the main injector have shown that the Johnsen effect is the dominant cause of beam loss and emittance blow up. To suppress this effect one must have control over alpha /sub 1/ (dispersion of the momentum compaction factor alpha ). Various gamma /sub t/ jump configurations are examined and the resulting changes in alpha /sub 1/-formulas are derived for a model FODO lattice with full chromaticity compensation in the presence of an eddy current sextupole component.<>
Keywords :
beam handling equipment; particle beam diagnostics; proton accelerators; FODO lattice; Fermilab; Johnsen effect; beam loss; chromaticity compensation; eddy current sextupole component; gamma /sub t/ jump schemes; main injector; momentum compaction factor; transition crossing; Azimuth; Contracts; Eddy currents; Educational institutions; Equations; Extraterrestrial measurements; Lattices; Phase measurement; Predictive models; Radio frequency;
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.1991.164735
