Design, installation, and commissioning of the D0 overpass at the Fermilab main ring

Conference · Tue Oct 01 00:00:00 EDT 1985 · IEEE Trans. Nucl. Sci.; (United States)

OSTI ID:6120757

Gerig, R; May, M; Moore, C; Ohnuma, S; Pruss, S; Turkos, F

In order to accommodate large detectors for pp studies at the Tevatron, the Main Ring has been modified to be non-planar. A 700 foot-long portion of the ring has been reworked to create an overpass which displaces the beam orbit upwards by 51 inches at the D0 long straight section. The overpass region follows the ''screw'' geometry proposed by T. Collins. A set of four vertically bending dipoles were inserted into the Main Ring lattice; they are powered on a separate bus and operate at twice the current and field level of a standard bend. To make space for these vertical bends, at each vertical bend point two of the four standard dipoles in a half-cell are removed and the other two are powered at twice the current and field level of the rest of the ring. The vertical bends also have a set of trim coils powered by a separate supply so that any difference in the horizontal and vertical bending strengths can be compensated. The D0 overpass was commissioned with beam in NovemberDecember 1984. The principal effect on beam dynamics - predicted and observed - is the introduction of momentum dispersion in the vertical dimension of peak value 1.9m. To preserve closed orbit quality during acceleration, the vertical bends must track the rest of the ring with a precision of better than 0.1%. The Main Ring-Tevatron complex has now been running the fixed-target program for four months; the impact of the D0 overpass on accelerator performance has been minimal.

• Research Organization: Fermi National Accelerator Laboratory, Batavia, IL
• OSTI ID: 6120757
• Report Number(s): CONF-850504-; TRN: 86-004359
• Journal Information: IEEE Trans. Nucl. Sci.; (United States), Vol. NS-32:5; Conference: Particle accelerator conference, Vancouver, Canada, 13 May 1985
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
FERMILAB TEVATRON
DESIGN
PERFORMANCE
ANTIPROTON BEAMS
BEAM BENDING MAGNETS
BEAM DYNAMICS
BEAM MONITORS
BEAM-BEAM INTERACTIONS
COLLIDING BEAMS
ORBITS
PROTON BEAMS
ACCELERATORS
ANTINUCLEON BEAMS
ANTIPARTICLE BEAMS
BEAMS
CYCLIC ACCELERATORS
ELECTRICAL EQUIPMENT
ELECTROMAGNETS
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MAGNETS
MEASURING INSTRUMENTS
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NUCLEON BEAMS
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430303* - Particle Accelerators- Experimental Facilities & Equipment