Title :
The Fermilab Accumulator Ring lattice upgrade
Author :
O´Day, S. ; Church, M.
Author_Institution :
Fermi Nat. Accel. Lab., Batavia, IL, USA
Abstract :
The Fermilab Antiproton Source Accumulator ring lattice will be changed to accommodate the planned upgrade of the Accumulator stacktail momentum cooling system. The bandwidth of the stacktail system will increase from 1-2 GHz to 2-4 GHz. This bandwidth change will provide the system with the additional cooling force necessary to stack a factor of two more flux than the present system. The lattice must be modified to halve the slip factor η of the machine as a result. Reducing η from -.023 to -.012 will avoid the Schottky band overlap which causes excessive beam heating and will permit the use of conventional notch filters for gain shaping. The new η will be achieved by replacing six high dispersion region quadrupoles and installing thirty-six quadrupole current shunts. Machine aperture, pickup to kicker phase advance and injection/extraction efficiency have not been compromised in the new lattice
Keywords :
beam handling techniques; particle beam injection; proton accelerators; storage rings; Accumulator Ring; Antiproton Source Accumulator ring; Fermilab; Schottky band overlap; aperture; bandwidth; extraction efficiency; injection efficiency; lattice upgrade; notch filters; pickup to kicker phase advance; quadrupole current shunts; quadrupoles; revolution frequency; slip factor; stacktail momentum cooling system; tune; Apertures; Bandwidth; Cooling; Filters; Heating; Lattices; Protons; Stacking; Stochastic processes; Storage rings;
Conference_Titel :
Particle Accelerator Conference, 1997. Proceedings of the 1997
Conference_Location :
Vancouver, BC
Print_ISBN :
0-7803-4376-X
DOI :
10.1109/PAC.1997.749910
