Effects of enhanced chromatic nonlinearity during the AGS {gamma}{sub t}-jump
- and others
The {gamma}{sub t}-jump de-signed to reduce the bunch self-field mismatch and intensity loss during the AGS transition crossing can cause significant orbit and lattice distortions and dramatically enhance chromatic nonlinear effects. Employing a low-intensity, small emittance proton bunch crossing transition with the {gamma}{sub t}-jump quadrupoles excited, we found that the nonlinear momentum-compaction factor {alpha}{sub 1} increases from 2.2 to about 90 in the presence of the {gamma}{sub t}-jump. On the other hand, this enhancement can be effectively suppressed by properly exciting the chromaticity sextupoles, reducing {alpha}{sub 1} from 90 to 16. The experimental measurement agrees well with computer simulations using MAD and TIBETAN.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 64973
- Report Number(s):
- BNL-61755; CONF-950512-116; ON: DE95011703
- Resource Relation:
- Conference: 16. Institute of Electrical and Electronic Engineers (IEEE) particle accelerator conference, Dallas, TX (United States), 1-5 May 1995; Other Information: PBD: [1995]
- Country of Publication:
- United States
- Language:
- English
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