Measuring Maximum Momentum Aperture Y. Luo, M. Bai, M. Blaskiewic, - - PowerPoint PPT Presentation

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Measuring Maximum Momentum Aperture Y. Luo, M. Bai, M. Blaskiewic, W. Fischer, A. Marusic (RHIC APEX Session: May 2, 2012) Backgrounds: 56 MHz RF Cavities Calculated Momentum Aperture Measurement with Radial shift Beam loss Observation

SLIDE 1

Measuring Maximum Momentum Aperture

Y. Luo, M. Bai, M. Blaskiewic, W. Fischer, A. Marusic

(RHIC APEX Session: May 2, 2012)

SLIDE 2

Backgrounds: 56 MHz RF Cavities

SLIDE 3

Calculated Momentum Aperture

SLIDE 4

Measurement with Radial shift

SLIDE 5

Beam loss Observation

SLIDE 6

Conclusion

With 2.0mm radial shift, we
bserved 500%/hour beam loss.

2.0mm corresponds to 0.0018 dp/p0 change.

There is no clear debunching

beam.

Considering the bunch dp/p0

spread is about 0.0004, the maximum dp/p0 of the beam is above 0.002.

( BTW, 1.75mm radial shift gives Blue beam 100%/hour decay, Yellow less than 20%/hours.)