Title :
Transition crossing in the Fermilab Main Ring, past and present
Author :
Kourbanis, I. ; Ng, K.Y.
Author_Institution :
Fermi Nat. Accel. Lab., Batavia, IL, USA
Abstract :
A recent installation of passive mode dampers in the Booster has eliminated most of the longitudinal emittance blowup of intense bunches due to coupled-bunch instabilities. As a result, high intensity effects (negative-mass instability) dominate the present transition crossing in the Main Ring for the high-intensity cycles. A negative-mass stability limit is derived for transition crossing in the Main Ring and recent observations of high frequency signals around transition is presented. Finally, some predictions about the effect of the negative mass instability on the transition in the Main Ring with the future upgrades are attempted
Keywords :
beam handling techniques; particle beam diagnostics; proton accelerators; synchrotrons; Fermilab Main Ring; coupled-bunch instabilities; high intensity effects; longitudinal emittance blowup; negative-mass instability; negative-mass stability limit; passive mode dampers; Displays; Educational institutions; Frequency; Laboratories; Monitoring; Pulse amplifiers; Pulse generation; Radiofrequency amplifiers; Stability; Switches;
Conference_Titel :
Particle Accelerator Conference, 1993., Proceedings of the 1993
Conference_Location :
Washington, DC
Print_ISBN :
0-7803-1203-1
DOI :
10.1109/PAC.1993.309740
