NASA Scientific and Technical Aerospace Reports

20060002069 Fermi National Accelerator Lab., Batavia, IL, USA
New Technique for Making Bright Proton Bunches Using Barrier RF Systems
Bhat, C. M.; January 2005; 8 pp.; In English
Report No.(s): DE2005-15017083; FERMILAB-CONF-05-140-AD; No Copyright; Avail.: National Technical Information
Service (NTIS)
I describe here a very promising scheme for producing bright proton bunches for proton-antiproton and proton-proton
colliders. The method is based on the use of wide-band barrier rf systems. First, I explain the principle of the method. The
beam dynamics simulations applied to the Fermilab Main Injector (MI) suggest that the scheme allows a wide range of bunch
intensities and emittances for ppbar collider. This method has the potential to increase the instantaneous luminosity by greater
than or equal to 30% at the Tevatron.
NTIS
Protons; Radio Frequencies; Proton-Antiproton Interactions; Emittance; Particle Accelerators
20060002070 Fermi National Accelerator Lab., Batavia, IL, USA
Iso-Adiabatic Merging of Pbar Stacks in the Fermilab Recycler
Bhat, C. M.; January 2004; 8 pp.; In English
Report No.(s): DE2005-15017084; FERMILAB-CONF-05-150; No Copyright; Avail.: Department of Energy Information
Bridge
Considerable longitudinal emittance (LE) dilution is seen during merging of two stacks of pbars in the Fermilab Recycler.
The emittance dilution results from the sequence of RF manipulations used for merging. Here the author presents a new
scheme for merging two stacks adiabatically. This involves energy matching of the two stacks before merging. An analytical
expression is derived for energy matching condition. The scheme is illustrated with multi-particle beam dynamics simulations
and beam measurements. The beam experiments have shown that one can preserve the emittance to better than 15%.
NTIS
Stacks; Particle Beams
20060002198 Fermi National Accelerator Lab., Batavia, IL, USA, New Mexico Univ., Albuquerque, NM, USA, Los Alamos
National Lab., NM USA, Rutherford Appleton Lab., Chilton, UK
8 GeV H- Ions: Transport and Injection
Chou, W.; Bryant, H.; Drozhdin, A.; Hill, C.; Kostin, M.; January 2005; 8 pp.; In English
Report No.(s): DE2005-15017059; FERMILAB-CONF-05-225-AD; No Copyright; Avail.: National Technical Information
Service (NTIS)
Fermilab is working on the design of an 8 GeV superconducting RF H(sup -) linac called the Proton Driver. The energy
of H(sup -) beam will be an order of magnitude higher than the existing ones. This brings up a number of technical challenges
to transport and injection of H(sup -) ions. This paper will focus on the subjects of stripping losses (including stripping by
blackbody radiation, field and residual gas) and carbon foil stripping efficiency, along with a brief discussion on other issues
such as Stark states lifetime of hydrogen atoms, single and multiple Coulomb scattering, foil heating and stress, radiation
activation, collimation and jitter correction, etc.
NTIS
Injection; Linear Accelerators; Protons
20060002200 Fermi National Accelerator Lab., Batavia, IL, USA
Feasibility Study of Beam-Beam Compensation in the Tevatron with Wires
Sen, T.; Erdelyi, B.; January 2005; 8 pp.; In English
Report No.(s): DE2005-15017078; No Copyright; Avail.: National Technical Information Service (NTIS)
We explore the possibility of compensating long-range beam-beam interactions in the Tevatron by current carrying wires.
Compensation strategies depend on whether the compensation is done close to the interaction or nonlocally, on the aspect ratio
of the strong beam and on other details. Strategies for each case have been developed and applied to the Tevatron. We discuss
the results of these strategies at injection and collision energy.
NTIS
Beam Interactions; Feasibility; Particle Accelerators; Wire
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