Tevatron Collider Operations Model

Elliott McCrory

A model of the Tevatron Collider at Fermilab has been implemented using Monte Carlo simulation techniques. This effort, which began during the Tevatron Collider Run I in 1990, has enabled us to understand the dynamics of operating the Collider. The plot to the left shows a smaple run of the Model for one week. I hope to have more charts available Real Soon Now. The scales are mushed here. Stack (green) is full scale Integrated (blue), Multiply by 50 (Fullscale=10000) Luminosity (red): Divide by 2 (Fullscale=100).

A listing of some recent plots of end-store optimizations is availble here.

What's going on here?

This is a phenomenological model of Collider operations, with key elements of the operation randomized. In particular, failure and downtimes occur randomly, in agreement with the rates observed in Reality. Also, performances are randomized, also in agreement with the range of possibilities in Reality. For example, the following items represent some of the performance measures that are randomized in this Model:

• Proton emittance at Low Beta
• Proton intensity at Low Beta
• Shot setup time
• Antiproton emittance growths and transmissions from the Accumulator to Low Beta
• The fraction of antiprotons removed from the Stack
• The emittance of the anitprotons as they are being extracted from the Stack
• The antiproton stacking rate
• The luminosity lifetime
• The growth of the luminosity lifetime

All fluctuations in performance as depicted in the Modeal are random, that is, performance cannot "improve" in a Model run. The primary use of the Model seems to be, so far, to help to develop intuition on Run Coordinator decisions, like when to end stores and why, and to develop strategies for recovery from failures.

Running the model yourself

A web interface for you to run the Model for yourself is being developed. You may try it here, but don't expect too much, yet.

Other Documents on this Model

All papers in BeamDocs by McCrory. The following talks have been added to the BeamDocs database on this topic:

• Beams Division Seminar on incorporating the Recycler into the model, Operations Model: Incorporating the Recycler.
• Update on The Tevatron Collider Operations .
• September 16, 2003 note on Tevatron Downtime
• Presentation to the Shot Analysis Meeting on September 11, 2003 on A Tevatron Monte Carlo Model. A preliminary version of this talk is also available, here.