PAC09 - List of Authors (Zhang, W.)

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Zhang, W.

Paper	Title	Page
TU6RFP066	AGS Fast Spin Resonance Jump, Magnets and Power Supplies	1699
	J.W. Glenn, H. Huang, A.K. Jain, C.J. Liaw, I. Marneris, W. Meng, J.-L. Mi, S.P. Pontieri, P.J. Rosas, J. Sandberg, J.E. Tuozzolo, W. Zhang BNL, Upton, Long Island, New York
	Funding: Work supported by Brookhaven Science Associates, LLC underContract No. DE-AC02-98CH10886 with the U.S. Department of Energy. In order to cross more rapidly the 82 weak resonances caused by the horizontal tune and the partial snakes, we plan to jump the horizontal tune 82 times during the acceleration cycle, 41 up and 41 down. To achieve this, the magnets creating this tune jump will pulse on in 100 micro-seconds, hold the current flat for about four milli-seconds and zero the current in another 100 micro-seconds. The magnets are old laminated beam transport magnets with longitudinal shims closing the aperture to reduce inductance and power supply current. The power supply uses a high voltage capacitor discharge to raise the magnet current, which is then switched to a low voltage supply, and then the current is switched back to the high voltage capacitor to zero the current. The current in each of the magnet pulses must match the order of magnitude change in proton momentum during the acceleration cycle. The magnet, power supply and cabling will be described with coast saving features and operational experience. Overcome Horizontal Depolarizing Resonances in the AGS with Tune Jump

Paper

Title

Page

TU6RFP066

AGS Fast Spin Resonance Jump, Magnets and Power Supplies

1699

J.W. Glenn, H. Huang, A.K. Jain, C.J. Liaw, I. Marneris, W. Meng, J.-L. Mi, S.P. Pontieri, P.J. Rosas, J. Sandberg, J.E. Tuozzolo, W. Zhang
BNL, Upton, Long Island, New York

Funding: Work supported by Brookhaven Science Associates, LLC underContract No. DE-AC02-98CH10886 with the U.S. Department of Energy.

In order to cross more rapidly the 82 weak resonances caused by the horizontal tune and the partial snakes, we plan to jump the horizontal tune 82 times during the acceleration cycle, 41 up and 41 down*. To achieve this, the magnets creating this tune jump will pulse on in 100 micro-seconds, hold the current flat for about four milli-seconds and zero the current in another 100 micro-seconds. The magnets are old laminated beam transport magnets with longitudinal shims closing the aperture to reduce inductance and power supply current. The power supply uses a high voltage capacitor discharge to raise the magnet current, which is then switched to a low voltage supply, and then the current is switched back to the high voltage capacitor to zero the current. The current in each of the magnet pulses must match the order of magnitude change in proton momentum during the acceleration cycle. The magnet, power supply and cabling will be described with coast saving features and operational experience.

*Overcome Horizontal Depolarizing Resonances in the AGS with Tune Jump