Status of ISABELLE lattice

Conference · Mon Jan 01 04:00:00 EST 1979

OSTI ID:6062753

Claus, J; Cornacchia, M; Courant, E D; Parzen, G

ISABELLE, a facility for colliding protons with center of mass energies between 60 and 800 GeV, is presently under construction at Brookhaven National Laboratory. The device consists of two identical rings for the accumulation, acceleration and storage of proton beams, shaped and interlaced in the horizontal plane to intersect in six so-called crossing points where the beams that rotate in opposite directions in the two rings are exposed to each other. The overall dimensions of the facility are kept relatively small because advantage is taken of the large fields and gradients that are possible in superconducting magnets; the associated saturation effects in the magnet iron make a separated function lattice practically inevitable. The rings are to be filled from the AGS, using synchronous beam transfer; this forces their circumference to an integer multiple of the rf wavelength in the AGS (=67.26 m). The integer chosen is 57, about the lowest value possible, thus the circumference of each ring is 3833.85 m. The charge in each ring is expected to be about 6.4 x 10/sup 14/ protons, which requires about 250 AGS charges of 2.75 x 10/sup 12/ protons per pulse if the injection efficiency is 100%.The actual efficiency is unlikely to be better than 50%, so that in excess of 500 AGS pulses may be needed per ring. The beam is to be accumulated in synchrotron phase space by means of an injection and stacking procedure similar to one developed for the ISR at CERN; this leaves the betatron emittance of the circulating beams independent of its intensity and equal to that in the AGS just before extraction while its momentum spread increases with intensity.

• Research Organization: Brookhaven National Lab., Upton, NY (USA)
• DOE Contract Number: EY-76-C-02-0016
• OSTI ID: 6062753
• Report Number(s): BNL-25798; CONF-790327-56
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430400* -- Particle Accelerators-- Storage Rings
ACCELERATOR FACILITIES
BEAM DYNAMICS
BEAMS
COLLIDING BEAMS
ENERGY RANGE
GEV RANGE
GEV RANGE 10-100
GEV RANGE 100-1000
ISABELLE STORAGE RINGS
MAGNETIC FIELD CONFIGURATIONS
NUCLEON BEAMS
ORBITS
PARTICLE BEAMS
PROTON BEAMS
SPECIFICATIONS
STORAGE RINGS