Operating Procedure Changes to Improve Antiproton Production at the Fermilab Tevatron Collider*
B. Drendel#, J. P. Morgan, D. Vander Meulen, FNAL, Batavia, IL 60510, U.S.A.

Stacking Performance

The Antiproton Source has doubled the rate at which Antiprotons are produced in just three years. The three plots below show the stack rate as a function of stack size, the weekly antiproton production and average stacking rate over a number of years.

Abstract
Since the start of Fermilab Collider Run II in 2001, the maximum weekly antiproton accumulation rate has increased from 400 x 1010 Pbars/week to approximately 3,700 x 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 the beam line orbit control, stochastic cooling power level management, and RF settings. In addition, daily tuning efforts have been streamlined by implementing sequencer driven tuning software.

The Flusher

The Flusher is an Accelerator Command Language (ACL) script is used to improve beam stability in the Accumulator by changing the voltage and modulating the phase of the Stabilizing RF. The plot on the left shows a typical large stack instability when the flusher is not run. Accumulator Transverse emittances increase and beam starts to fall out of the Accumulator. The plot on the right shows the flusher operating on large stack. In this case the Accumulator transverse emittances stay under control and we continue to stack.

Tuning

Daily Antiproton Source tuning efforts have been streamlined by implementing sequencer driven tuning procedures. The upper left plot shows the Pbar Sequencer. Each tuning procedure is selected on the left and when that aggregate is launched, the individual commands on the right are sequentially executed.

Beam Line Tuner

The Beam Line Tuner (called the “Oscillation Overthruster”) is an application that corrects the 120 GeV proton beam orbit in the P1, P2 and AP1 lines, as well as the secondary 8 GeV beam orbit in the AP2 line.

Stacktail Monitor

*Operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy
#drendel@fnal.gov

The Stacktail Monitor is an Accelerator Command Language (ACL) script that regulates stacktail power based on stack size. The plot on the left shows the stacktail trunk attenuator changing with stack size to regulate the stacktail power.