An experimental study of the SSC (Superconducting Super Collider) magnet aperture criterion

Technical Report · Tue Jan 12 04:00:00 EST 1988

DOI:https://doi.org/10.2172/6750627· OSTI ID:6750627

Chao, A; Johnson, D; Peggs, S; Peterson, J; Schachinger, L ^[1]; Meller, R; Siemann, R; Talman, R ^[2]; Vos, L ^[3]; Morton, P ^[4]; Edwards, D; Finl,

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1. Lawrence Berkeley Lab., CA (USA). SSC Central Design Group
2. Cornell Univ., Ithaca, NY (USA). Newman Lab. of Nuclear Studies
3. European Organization for for Nuclear Research, Geneva (Switzerland). SPS Div.
4. Stanford Linear Accelerator Center, Menlo Park, CA (USA)

The magnetic field quality specification used in the SSC Conceptual Deign Report is based on the imposition of bounds to the departure from linear behavior in the oscillation of single particles about their closed orbits. The specification is physically reasonable, but it is important to give serious attention to the values assigned to the parameters in the criterion. This experiment is part of that effort. Nonlinearities in the magnetic fields will lead to gradual changes in the magnitudes of the transverse amplitude projections. The single point of the turn-by-turn plot will develop, in general, into an area. The distance of a point within this area to the mean position of all the points is a measure of the change of amplitude. The criterion places a limit on the ratio of this change to the mean amplitude. In particular, the rms value of this fractional excursion, termed the smear,''is to be less than 7% within the aperture used for routine beam operations. The principles aims of experiment E778 are to determine if the smear is predictable from calculation, if the 7% bound is appropriate, and if modification of the criterion is necessary. The Tevatron was considered a suitable laboratory for this activity because it is a proton accelerator with excellent linear behavior; moreover there was a substantial number of sextupole magnets already installed that could be used as controllable sources of nonlinearity. This progress report is a summary of the effort on this experiment to date and preliminary analysis of the data.

• Research Organization: Lawrence Berkeley Lab., CA (USA). SSC Central Design Group
• Sponsoring Organization: DOE/ER
• DOE Contract Number: AC02-89ER40486
• OSTI ID: 6750627
• Report Number(s): SSC-156; FN--471; ON: DE90013788
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430200* -- Particle Accelerators-- Beam Dynamics
Field Calculations
& Ion Optics
430300 -- Particle Accelerators-- Auxiliaries & Components
APERTURES
BEAM DYNAMICS
BEAM OPTICS
BETATRON OSCILLATIONS
DOCUMENT TYPES
ELECTRICAL EQUIPMENT
ELECTROMAGNETS
EQUIPMENT
MAGNETIC FIELDS
MAGNETS
MATHEMATICAL SPACE
OPENINGS
OSCILLATIONS
PHASE SPACE
PROGRESS REPORT
SPACE
SPECIFICATIONS
STORAGE RINGS
SUPERCONDUCTING DEVICES
SUPERCONDUCTING MAGNETS
SUPERCONDUCTING SUPER COLLIDER