AGS Circumference Change when Pulsing 3/2 Lamdba G10 Bump

Technical Report · Mon Jul 01 04:00:00 EDT 2002

DOI:https://doi.org/10.2172/1061674· OSTI ID:1061674

Glenn, J. W. ^[1]; Harvey, M. ^[1]

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1. Brookhaven National Laboratory (BNL), Upton, NY (United States). Relativistic Heavy Ion Collider (RHIC)

The original FEB bumps that move the beam into the G10 kicker and alongside the H10 ejector had two adverse side effects: They lengthen the circumference of the AGS thus requiring deceleration of the beam to keep the frequency constant for RHIC cogging; and they couple to the Main Magnet power supply causing current drift in the magnet. Changing to slowly pulsed ‘DC’ supplies eliminates these problems but raises concerns at G10 that high intensity power from the beam will be coupled into modulator electronics causing premature failures. All of the circulating beam in the AGS would travel through the G10 kicker magnet for of order hundreds of ms rather than for the few ms of the pulsed configuration. Following from this, the impedance that the high brightness Au or proton beams see while in the kicker could cause instabilities and dilution. Therefore, a third “hybrid” solution was found that employs a DC bump for the motion at H10 but retains a modified pulsed bump for G10. In this case the G10 bump is configured to interact only very weakly with the AGS main magnet power supply. Existing windings and power supplies were reconfigured to approximate a 3/2 lambda bump [two magnets were ~25° out of phase (meaning away from the spacing required for an ideal bump) ]. During the FY2002 HEP we ran tests of the 3/2 lambda G10 Bump at RHIC extraction energy. The windings were powered by existing supplies. We then measured the change in the AGS circumference and AGS field. The bump was configured using the F08, F09, G02, G03 magnets powered by BLWG09A ps and G16, G17, H08, H09 magnets by BLWH09A ps.

• Research Organization: Brookhaven National Laboratory (BNL), Upton, NY (United States). Relativistic Heavy Ion Collider (RHIC)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 1061674
• Report Number(s): BNL--99233-2013-IR; C-AD-80; KB0202011
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
Relativistic Heavy Ion Collider