M A Furman 2006 New J. Phys. 8 279 doi:10.1088/1367-2630/8/11/279
A preliminary assessment of the electron-cloud effect for the FNAL main injector upgrade
Focus on Accelerator and Beam PhysicsM A Furman
Show affiliationsPart of Focus on Accelerator and Beam Physics
We present results from a preliminary assessment, via computer simulations, of the electron-cloud (EC) density for the FNAL Main Injector upgrade at injection energy. Assuming a peak value for secondary emission yield δmax = 1.3, we find a threshold value of the bunch population, Nb,th
1.25 ×1011, beyond which the EC density ρe reaches a steady-state level that is ~104 times larger than for Nb<Nb,th, essentially neutralizing the beam, and leading to a tune shift ~0.05. Our investigation is limited to a field-free region and to a dipole magnet region, both of which yield similar results for both Nb,th and the steady-state value of ρe. Possible dynamical effects from the EC on the beam, such as emittance growth and instabilities, remain to be investigated separately.
- PACS
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29.27.Ac Beam injection and extraction
- Subjects
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Accelerators, beams and electromagnetism
- Dates
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Issue 11 (November 2006)
Received 27 March 2006
Published 28 November 2006
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A preliminary assessment of the electron-cloud effect for the FNAL main injector upgrade
M A Furman 2006 New J. Phys. 8 279