Intermediate-Energy Electron Cooling for Antiproton Sources
- Wisconsin U., Madison
Electron-cooling at low energies ($$\gamma$$ slightly greater than one) has been shown to be an extremely effective means to increase the phase space density of proton beams. This document starts with a review of the progress made in low energy electron cooling, followed by a brief look at the parameters of intermediate energy electron cooling. ($$\gamma$$ of five to ten). The results of an emittance measurement done on an electrostatic accelerator are presented indicating that such a device would be ideal for intermediate energy electron cooling. A complete electron optics design of the system is done next, solving the beam envelope evolution problem in the presence of emittance, space charge, and acceleration. Application of intermediate energy electron cooling to the Fermilab antiproton source is theoretically studied. The amount of time it takes for the antiproton beam to cool is calculated including the effects of finite electron beam temperature, betatron oscillations, and intrabeam scattering. A four ampere electron beam will cool the Fermilab antiproton beam in half an hour. Lastly, the final equilibrium antiproton emittances obtainable are estimated. Equilibrium between the competing processes of intrabeam scattering and electron cooling exists when the transverse antiproton beam emittances are 0.12 $$\pi$$ mm-mr and the longitudinal antiproton beam emittance is $$\Delta$$ p/p = l x $$10^{-5}$$ This represents a phase space density increase of about 15 in each transverse plane, and an improvement of 20 in the energy resolution of the accumulator. Possible instabilities of such a dense beam are investigated.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1433232
- Report Number(s):
- FERMILAB-THESIS-1986-15; WISC-EX-86-271; 230586
- Country of Publication:
- United States
- Language:
- English
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