Calculation of beam sweeping effect for the Fermilab antiproton source

Antiproton production for Tevatron

“…Needs to improve the Fermilab Pbar Source for the Tevatron Upgrade and discrepancies [1,2] in predictions of the antiproton yields have forced us to develop the production model based on the modern data and to incorporate this model to the current version of MARSlO code [3]. The inclusive scheme of this code with the use of statistical weights allows the production of antiprotons to be enhanced within the phase -space region of interest, which is extremely effective for optimization of Pbar Source parameters and for developing of such an idea as a beam sweeping system [4].…”

Report on Plans of the Beams Division for TeV33

“…Figure 9 shows the scaling of the relative yield of antiprotons as a function of rms beam spot size. Also shown is the energy density in a copper target as a function of rms beam spot size as calculated by MARS10 6 for 5xl0 12 protons per pulse 7 . Estimates of the peak density of energy deposition per pulse achieved to date are in the range of 800 Jig.…”

Longitudinal phase-space coating of beam in a storage ring

“…However, during the Tevatron collider operations at the Fermilab between 2000 to 2011 none of the previously developed beam stacking methods could be used in the Recycler Ring [8], a permanent magnet 8 GeV storage synchrotron, which exclusively used barrier radio-frequency (rf) systems [9,10] in all of its beam manipulations. For this reason and in order to support luminosity upgrades [11] new methods needed to be developed for beam operation [12,13].…”

“…al., [9] in 1983 and the flexibility they provided in the handling the beam with very complex bunching formats, like that demonstrated in longitudinal momentum mining [14], has opened up new prospects in beam dynamics not possible with conventional harmonic rf systems. Over the past decade, substantial experimental and theoretical progress have taken place in the field of barrier rf systems because of their important role in the Fermilab Recycler Ring [12][13][14][15][16], induction accelerator at KEK [17], R&D effort at CERN and BNL [18] and the proposed future NESR facility at GSI [19].…”

“…It was imperative to keep the emittance of the cooled beam intact during the rf manipulations needed during beam stacking. All of the previously adopted beam accumulation techniques [12,13] encountered difficulty in preserving longitudinal emittance.…”