National Technical Reports Library

The National Technical Information Service acquires, indexes, abstracts, and archives the largest collection of U.S. government-sponsored technical reports in existence. The NTRL offers online, free and open access to these authenticated government technical reports. Technical reports and documents in its repository may be available online for free either from the issuing federal agency, the U.S. Government Publishing Office’s Federal Digital System website, or through search engines.

Details

Stochastic Boundary, Diffusion, Emittance Growth and Lifetime Calculation for the RHIC E-Lens.

DE2009946783

Publication Date	2009
Personal Author	Abreu, M. P.; Fischer, W.; Robert-Demolaize, G.
Page Count	14
Abstract	To compensate the large tune shift and tune spread generated by the head-on beam-beam interactions in polarized proton operation in the Relativistic Heavy Ion Collider (RHIC), a low energy electron beam with proper Gaussian transverse profiles was proposed to collide head-on with the proton beam. In this article, using a modified version of SixTrack, we investigate stability of the single particle in the presence of head-on beam-beam compensation. The Lyapunov exponent and action diffusion are calculated and compared between the cases without and with beam-beam compensation for two different working points and various bunch intensities. Using the action diffusion results the emittance growth rate and lifetime of the proton beam is also estimated for the different scenarios.
Keywords	Beam emittance Beam-beam interactions Diffusion Electron beams Heavy ions Lifetime Proton beams Protons Stability
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Brookhaven National Lab., Upton, NY. Collider-Accelerator Dept.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200911
Contract Number	DE-AC02-98CH10886

Stochastic Boundary, Diffusion, Emittance Growth and Lifetime Calculation for the RHIC E-Lens.

Stochastic Boundary, Diffusion, Emittance Growth and Lifetime Calculation for the RHIC E-Lens.
DE2009946783

Publication Date	2009
Personal Author	Abreu, M. P.; Fischer, W.; Robert-Demolaize, G.
Page Count	14
Abstract	To compensate the large tune shift and tune spread generated by the head-on beam-beam interactions in polarized proton operation in the Relativistic Heavy Ion Collider (RHIC), a low energy electron beam with proper Gaussian transverse profiles was proposed to collide head-on with the proton beam. In this article, using a modified version of SixTrack, we investigate stability of the single particle in the presence of head-on beam-beam compensation. The Lyapunov exponent and action diffusion are calculated and compared between the cases without and with beam-beam compensation for two different working points and various bunch intensities. Using the action diffusion results the emittance growth rate and lifetime of the proton beam is also estimated for the different scenarios.
Keywords	Beam emittance Beam-beam interactions Diffusion Electron beams Heavy ions Lifetime Proton beams Protons Stability
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Brookhaven National Lab., Upton, NY. Collider-Accelerator Dept.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200911
Contract Number	DE-AC02-98CH10886