• R.J. Pasquinelli, B.E. Drendel, K. E. Gollwitzer, S.R. Johnson, V.A. Lebedev, A.F. Leveling, J.P. Morgan, V.P. Nagaslaev, D.W. Peterson, A.D. Sondgeroth, S.J. Werkema
  Fermilab, Batavia

Run II has been ongoing since 2001. Peak luminosities in the Tevatron have increased from approximately 10×10³⁰ cm^-2ses^-1 to 300×10³⁰ cm^-2ses^-1 – a factor of 30 improvement. A significant contributing factor in this remarkable progress is a greatly improved antiproton production capability. Since the beginning of Run II, the average antiproton accumulation rate has increased from 2×10¹⁰ p/hr to about 24×10¹⁰ p/hr. Peak antiproton stacking rates presently exceed 25×10¹⁰ p/hr. The antiproton stacking rate has nearly doubled in the last two years alone. A variety of improvements have contributed to the recent progress in antiproton production. The process of transferring antiprotons to the Recycler Ring for subsequent transfer to the collider has been significantly restructured and streamlined, allowing more time to be utilized for antiproton production. Improvements to the target station have greatly increased the antiproton yield from the production target. The performance of the Antiproton Source stochastic cooling systems has been enhanced by improvements to the cooling electronics, accelerator lattice optimization, and improved operating procedures.

• J.P. Morgan, B.E. Drendel, D. Vander Meulen
  Fermilab, Batavia

Funding: Operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy.

Since 2005, the Recycler has become the sole storage ring for antiprotons used in the Tevatron Collider. The operational role of the Antiproton Source has shifted exclusively towards producing antiprotons for periodic transfers to the Recycler. The process of transferring the antiprotons from the Accumulator to the Recycler has been greatly improved, leading to a dramatic reduction in the transfer time. The reduction in time has been accomplished with a net improvement in transfer efficiency and an increase in average stacking rate. This paper will describe the software improvements that streamlined the transfer process and other changes that contributed to a significant increase in the number of antiprotons available to the Collider.

• B.E. Drendel, J.P. Morgan, D. Vander Meulen
  Fermilab, Batavia

Funding: Operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy

Since the start of Fermilab Collider Run II in 2001, the maximum weekly antiproton accumulation rate has increased from 400·10¹⁰ Pbars/week to approximately 3,700·10¹⁰ Pbars/week. There are many factors contributing to this increase, one of which involves changes to operational procedures that have streamlined and automated antiproton source production. Automation has been added to our beam line orbit control, stochastic cooling power level management, and RF settings. In addition, daily tuning efforts have been streamlined by implementing sequencer driven aggregates.