Upward and onward: Tevatron, NuMI reach records
The plot shows the record antiproton stash from April 19.
Just when Accelerator Division staff thought they couldn't do any better, the laboratory, with their help, gets a trio of records.
Fermilab is producing and storing more antiprotons and colliding them with protons faster than ever. The laboratory achieved three records within the last two weeks: for Tevatron delivered record luminosity, antiprotons stashed in the Recycler and most protons sent to the NuMI target.
The latest record was reached between April 13 and 20, when the Accelerator Division achieved 73.1 inverse picobarns of weekly integrated luminosity, a 25 percent increase from the same time last year.
Cons Gattuso, Fermilab's run coordinator, attributed the record to a handful of factors, including improved antiproton stacking rates and the abundant supply of antiprotons. The extra antiprotons were produced during an equipment failure that prevented them from being used then. Along with good stable running, each of the 10 stores the we put into the Tevatron survived to termination.
He also attributes the record to improved antiproton production.
"Integrated luminosity is a function of how fast we make antiprotons," Gattuso said. "We get more luminosity when we utilize more antiprotons per shot."
The record for the number of antiprotons stashed at one time ,498e10 was set on April 19. That record, Gattuso said, was possible because of the application of a new technique: partial mining.
Partial mining allows the operators more freedom to extract only the portion of the beam they need, leaving antiprotons behind in the Recycler, and reducing the risk of losing large stacks of antiprotons from the Accumulator.
"We normally mine all of the beam out into the recycler," Gattuso said. "But we had too many antiprotons and we needed to come up with a way to leave some beam behind."
The most accumulated protons on target, 7e20, was reached by the NuMI experiment on Monday, April 6. The Accelerator Division also provided the NuMI experiment with the most beam in a single day on Tuesday, April 14.
"The experiment continues to work really well, and we continue to get a lot of beam from the Accelerator Complex," said NuMI/MINOS spokesperson Rob Plunkett.
-- Rhianna Wisniewski