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Choosing End of Store Times

Learn about the factors that impact end of store (EOS) time in particle accelerators and how to choose the optimal EOS time. Explore tools such as Excel and JAS plots, luminosity decay analysis, and more. Balance between operational efficiency and experimental requirements.

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Choosing End of Store Times

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  1. Choosing End of Store Times • When things are running smoothly: • Choosing Accumulator to Recycler Transfer Times (Morgan Data) • Choosing Store Lengths (McGinnis Model) • Other Factors That Impact EOS Time • Balance between what is best for operations and what is best for the experiments • Events that impact Pbar production • Events that impact Tevatron operations • Events that impact the experiments. • Examples of Some of Our Tools • Excel and JAS Plots • Luminosity Decay • Datalogger • SDA • Future Tools • What would be useful to the Run Coordinator Team? How to chose an End of Store Time? Brian Drendel

  2. Optimizing Transfers from Accumulator to Recycler • Effective Stacking Rate • Stack rate as a function of stack size • Transfer Efficiency • Time per transfer • Recycler Lifetime (as a function of stash size?) How to chose an End of Store Time? Brian Drendel

  3. How to chose an End of Store Time? Brian Drendel

  4. Tool to Optimize EOS Time • McGinnis Excel Luminosity Tool • Document Database #2022 • http://beamdocs.fnal.gov/AD-public/DocDB/ShowDocument?docid=2022 • An Excel Tool that allows you to generate plots by modifying parameters that impact integrated luminosity How to chose an End of Store Time? Brian Drendel

  5. McGinnis Tool Optimal Store Length How to chose an End of Store Time? Brian Drendel

  6. It’s not a perfect world • When things are running smoothly: • Choosing Accumulator to Recycler Transfer Times (Morgan Data) • Choosing Store Lengths (McGinnis Model) • Other Factors That Impact EOS Time • Balance between what is best for operations and what is best for the experiments • Events that impact Pbar production • Events that impact Tevatron operations • Events that impact the experiments. • Examples of Some of Our Tools • Excel and JAS Plots • Luminosity Decay • Datalogger • SDA • Future Tools • What would be useful to the Run Coordinator Team? How to chose an End of Store Time? Brian Drendel

  7. It’s a balancing game What’s Good for Operations What’s Good for the Experiments How to chose an End of Store Time? Brian Drendel

  8. Injector Chain/Pbar/Recycler Downtime Inefficiencies (When do you stop and fix it?) Accesses (Time constraints?) Dropped transfers Pbar/Recycler instabilities and beam losses. Maximum Stash and Stack Sizes Stack rate as a function of stack size Sharing the Beam NuMI and SY120 Studies (Time constraints?) Pbar Factors that Alter EOS Times How to chose an End of Store Time? Brian Drendel

  9. Tevatron Factors the Influence EOS Times • In Store Events that reduce luminosity (i.e. TRF trips, TEL trips, Separator Sparks…) • Tevatron Access Time (F-Sector access turns off stacking and the Neutrino Program). • Machine Stability (how often do we lose a store? How often do we lose a store up the ramp versus later during the store?) • Inefficiencies (when do we stop for repairs?) • Studies and Upgrades (how to balance gains made with lost luminosity?) How to chose an End of Store Time? Brian Drendel

  10. Experiment Factors that influence EOS times • Collision Hall Accesses (Access time limitations?) • Minimum and maximum useful Luminosity for Collision Halls (What is the current trigger table range?) • One Collision Hall on, one Collision Hall off dilemma. How to chose an End of Store Time? Brian Drendel

  11. Choosing End of Store Times • When things are running smoothly: • Choosing Accumulator to Recycler Transfer Times (Morgan Data) • Choosing Store Lengths (McGinnis Model) • Other Factors That Impact EOS Time • Balance between what is best for operations and what is best for the experiments • Events that impact Pbar production • Events that impact Tevatron operations • Events that impact the experiments. • Examples of Some of Our Tools • Excel and JAS Plots • Luminosity Decay • Datalogger • SDA • Future Tools • What would be useful to the Run Coordinator Team? How to chose an End of Store Time? Brian Drendel

  12. Plots we look at every day! • A few sample plots that we look at: • Initial Luminosity as a function of available pbars. • Initial Luminosity as a function of protons*pbars. • Protons at the start of stores over time. • Pbars at the start of stores over time How to chose an End of Store Time? Brian Drendel

  13. How to chose an End of Store Time? Brian Drendel

  14. How to chose an End of Store Time? Brian Drendel

  15. How to chose an End of Store Time? Brian Drendel

  16. How to chose an End of Store Time? Brian Drendel

  17. When we we get to 30e30 cm-2 s-1? • When things are running smoothly: • Choosing Accumulator to Recycler Transfer Times (Morgan Data) • Choosing Store Lengths (McGinnis Model) • Other Factors That Impact EOS Time • Balance between what is best for operations and what is best for the experiments • Events that impact Pbar production • Events that impact Tevatron operations • Events that impact the experiments. • Examples of Some of Our Tools • Excel and JAS Plots • Luminosity Decay • Datalogger • SDA • Future Tools • What would be useful to the Run Coordinator Team? How to chose an End of Store Time? Brian Drendel

  18. Predicting Luminosity • Luminosity Decay Fits • Simple approximation method • Compare with a similar store • Excel Decay Fit • Elliott Decay Fit Web How to chose an End of Store Time? Brian Drendel

  19. How to chose an End of Store Time? Brian Drendel

  20. Predicting Luminosity • Luminosity Decay Fits • Simple approximation method • Compare with a similar store • Excel Decay Fit • Elliott Decay Fit Web How to chose an End of Store Time? Brian Drendel

  21. How to chose an End of Store Time? Brian Drendel

  22. Predicting Luminosity • Luminosity Decay Fits • Simple approximation method • Compare with a similar store • Excel Decay Fit • Elliott Decay Fit Web How to chose an End of Store Time? Brian Drendel

  23. Tevatron Decay Models • Modified Exponential (Elliott McCrory) • Modified Inverse Time (Vladimir Shiltsev) How to chose an End of Store Time? Brian Drendel

  24. Brian’s Decay Fit Excel Tool • Document Database # 2230 • http://beamdocs.fnal.gov/AD-public/DocDB/ShowDocument?docid=2230 • Get store luminosity date from the Datalogger. How to chose an End of Store Time? Brian Drendel

  25. How to chose an End of Store Time? Brian Drendel

  26. How to chose an End of Store Time? Brian Drendel

  27. How soon can I make a prediction? • How long into the store before we can make an accurate prediction? • Let’s look at some real store data. How to chose an End of Store Time? Brian Drendel

  28. How to chose an End of Store Time? Brian Drendel

  29. How to chose an End of Store Time? Brian Drendel

  30. Modified Exponential When can I trust my predictions? • Modified Inverse Time How to chose an End of Store Time? Brian Drendel

  31. Predicting Luminosity • Luminosity Decay Fits • Simple approximation method • Compare with a similar store • Excel Decay Fit • Elliott Decay Fit Web How to chose an End of Store Time? Brian Drendel

  32. Elliott’s Decay Fit Website • Elliott McCrory Decay Fit Tool • http://tomato.fnal.gov/fitimages/currentStore/ • Website updates every couple of hours with fits from each of the Tevatron decay fit models. • One version shows a plot with both • Modified Exponential Fit • Modified Inverse Time Fit How to chose an End of Store Time? Brian Drendel

  33. Elliott’s Web Luminosity Decay Fits How to chose an End of Store Time? Brian Drendel

  34. Choosing End of Store Times • When things are running smoothly: • Choosing Accumulator to Recycler Transfer Times (Morgan Data) • Choosing Store Lengths (McGinnis Model) • Other Factors That Impact EOS Time • Balance between what is best for operations and what is best for the experiments • Events that impact Pbar production • Events that impact Tevatron operations • Events that impact the experiments. • Examples of Some of Our Tools • Excel and JAS Plots • Luminosity Decay • Datalogger • SDA • Future Tools • What would be useful to the Run Coordinator Team? How to chose an End of Store Time? Brian Drendel

  35. Two Datalogger Examples • Putting it all together with two Datalogger examples • Example #1: Stable Running • Example #2: Stacking Downtime and Collision Hall Access. How to chose an End of Store Time? Brian Drendel

  36. How to chose an End of Store Time? Brian Drendel

  37. How to chose an End of Store Time? Brian Drendel

  38. Choosing End of Store Times • When things are running smoothly: • Choosing Accumulator to Recycler Transfer Times (Morgan Data) • Choosing Store Lengths (McGinnis Model) • Other Factors That Impact EOS Time • Balance between what is best for operations and what is best for the experiments • Events that impact Pbar production • Events that impact Tevatron operations • Events that impact the experiments. • Examples of Some of Our Tools • Excel and JAS Plots • Luminosity Decay • Datalogger • SDA • Future Tools • What would be useful to the Run Coordinator Team? How to chose an End of Store Time? Brian Drendel

  39. What would be useful to the Run Coordinator Team? • Models are great; Tools are better How to chose an End of Store Time? Brian Drendel

  40. Any future tools used to optimize end of store times should include: Items that impact Pbar production Items that impact the Tevatron operations Items that impact the experiments Future Tools? How to chose an End of Store Time? Brian Drendel

  41. Useful References • Drendel, Brian. Tevatron Decay Fit Excel Tool, Beams. Document Database # 2230 • <http://beamdocs.fnal.gov/AD-public/DocDB/ShowDocument?docid=2230> • McGinnis, Dave. Recycler-Only Operations Luminosity Projections. Beams Document Database #2022. <http://beamdocs.fnal.gov/cgi-bin/public/DocDB/ShowDocument?docid=2022>. • McCrory, Elliot. A Monte Carlo Model of the Tevatron, Beams Document Database #829. <https://beamdocs.fnal.gov/AD-private/DocDB/ShowDocument?docid=829>. • McCrory, Elliot. Tevatron Decay Fits. Home page. 2006. <http://mccrory.fnal.gov/tevatronDecayFits/key.html>. • McCrory, Elliot. Fitting the Luminosity Decay: Fits and Correlations. Beam Document Database #1305. <https://beamdocs.fnal.gov/AD-private/DocDB/ShowDocument?docid=1305> • Roman, Steven. Writing Excel Macros with VBA, Ed. Warren T. Reich. 4 vols. O’Reily Publishers, 2002. • Liengme, Bernard V. Microsoft Excel 2003 For Scientists and Engineers. Third Edition. Elsevier Butterworth Heinemann, 2004. • Walkenbach, John. Microsoft Excel 2000 Power Programming with VBA. Hungry Minds, Inc. 1999. How to chose an End of Store Time? Brian Drendel

  42. How to chose an End of Store Time? Brian Drendel

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