Run II Operational Issues f Elvin Harms Antiproton

Run II Operational Issues f Elvin Harms Antiproton Source

Engineering Run summary f • mechanics of 36 X 36 were demonstrated and refined • luminosity provided - 57. 6 nb-1 delivered to CDF • lessons continuously learned • kudos to all involved 11 December 2000 Run II Retreat/Operational Issues 2

Operational Issues for Run II • Mechanics • Physics 11 December 2000 f Run II Retreat/Operational Issues 3

Mechanics Issues • • • f Personnel Set up time Time Line Generator (TLG) Reliability Sequenced Data Acquisition (SDA) Sequencer 11 December 2000 Run II Retreat/Operational Issues 4

Mechanics - Personnel f • shot teams to provide around the clock coverage necessary at onset of run • expanded cadre of experts necessary, but. . . • experts cannot do shots forever • experts needed for analysis, luminosity improvements, Run IIb, and… – keep the complex working 11 December 2000 Run II Retreat/Operational Issues 5

Mechanics - Personnel f • Operations team is an invaluable commodity • concerted effort to train/assimilate MCR crews - variety of ways • teamwork & communication 11 December 2000 Run II Retreat/Operational Issues 6

Mechanics - Set up time f • set up time reduced from > 1 shift to ~3 hours, can do better • how much better? • Identify shortcuts – routine ‘express lane’ set up – detailed check-ups as needed 11 December 2000 Run II Retreat/Operational Issues 7

Mechanics - Set up time • Successes already f – loading protons: 9 seconds per bunch X 36 bunches = 324 seconds – loading antiprotons: 33. 6 seconds per transfer X 9 transfers (4 bunches/transfer) = 302. 4 seconds 11 December 2000 Run II Retreat/Operational Issues 8

Mechanics - Set up time • Bottlenecks f – beam lines tune up – Accumulator reverse proton TBT tune-up – diagnostics set up, working, data archived – Tevatron energy 11 December 2000 Run II Retreat/Operational Issues 9

Mechanics - TLG f • new paradigm needed – can we move further away from canonical 220 second Supercycle? – Greater use of specialized Timelines • Modules developed during Engineering Run • more discipline/planning a priori – how many times has this been discussed? 11 December 2000 Run II Retreat/Operational Issues 10

Mechanics - TLG f • ‘Meijer’ Timelines are not efficient! – editing – machine operation – planning – recalling previous modes of running – frustration 11 December 2000 Run II Retreat/Operational Issues 11

Mechanics - TLG f Meijer Timeline Load Pbars Timeline 11 December 2000 Shot Set-up Timeline Load Protons Timeline Run II Retreat/Operational Issues 12

Mechanics - TLG f • learn new TLG features – revisit ‘old’ plans • implement expanded TLG capabilities • continue looking at additional possibilities 11 December 2000 Run II Retreat/Operational Issues 13

Mechanics - Reliability f • pay attention to problems no matter how minor • anticipate/learn from past experience – new Fermilab attitude? • document • disseminate information/2 -way communication 11 December 2000 Run II Retreat/Operational Issues 14

Mechanics - Reliability f • address known sources of problems – LLRF processors, infrastructure – P 1 AP 3 reproducibility – Beam loss 11 December 2000 Run II Retreat/Operational Issues 15

Mechanics - SDA • • f Java SDA works to 0 th order continue to input devices SDA Editor fully commission SDA viewers fold in data from Applications/remote diagnostics 11 December 2000 Run II Retreat/Operational Issues 16

Mechanics - Sequencers f • Sequencers foster consistent shots • Machine sequencers must be coordinated Master Sequencer/States? • Sequencer code becoming more generic – rely less on ‘special’ commands – enhance Applications to handshake with Sequencer 11 December 2000 Run II Retreat/Operational Issues 17

• • • f Physics Issues Run II goals Current performance Tools Shortcomings Areas of Focus 11 December 2000 Run II Retreat/Operational Issues 18

Physics Issues - Run II parameters f 11 December 2000 Run II Retreat/Operational Issues 19

Physics Issues - Current performance f TOR 910/A: IBEAM = 89% TOR 105/A: IBEAM = 92% I: IBEAMS/A: IBEAM = 84% TOR 105/A: IBEAM = ? ? % TORF 16/A: IBEAM = 100+% I: IBEAMS/A: IBEAM = 84% I: TOR 902/I: IBEAMS = 91% I: TOR 914/I: IBEAMS = 69% Acceleration efficiency = 96% T: IBEAMS/I: IBEAMS = 57% 11 December 2000 Run II Retreat/Operational Issues 20

Physics Issues - Current performance f coalescing Uniform Pbar bunches Loaded Tevatron Collider Protons 11 December 2000 Run II Retreat/Operational Issues 21

Physics Issues - Areas of Focus f 11 December 2000 Run II Retreat/Operational Issues 22

Physics Issues - Tools f • make the most of new tools, share ideas and techniques AP 1 Wall Current Monitor TDS 640 Scope 11 December 2000 Accumulator Core Vector Signal Analyzer Run II Retreat/Operational Issues 23

Physics Issues - Tools f P 1 AP 3 tuner Accumulator TBT We’re sorry no Tevatron BLT display available Main Injector BLT 11 December 2000 Run II Retreat/Operational Issues 24

Physics Issues - Tools • flying wires • Ion Profile monitors • BPM’s 11 December 2000 f Run II Retreat/Operational Issues 25

Physics Issues - Shortcomings f • flying wires • Beam line BPM’s - must overcome timing overlap/conflicts • MI BPM’s - must be able to detect Pbars • Auto-tuning using developed tools • intensity monitor cross-calibration 11 December 2000 Run II Retreat/Operational Issues 26

Physics Issues - Areas of Focus f • Emittance growth during unstacking • Pbar injection into MI • Coalescing – efficiency – maximum bunch # limit – performance as a function of bunch intensity • Main Injector to Tevatron efficiency for Pbars 11 December 2000 Run II Retreat/Operational Issues 27

Physics Issues - Unanswered question f • Recycler - when/how to integrate 11 December 2000 Run II Retreat/Operational Issues 28

f Conclusion • Accomplishments to date – re-established the Tevatron as a Collider – assimilated the Main Injector into the Collider complex – commissioned a new Accumulator unstacking scheme – succeeded at 36 X 36 bunch operation – delivered luminosity to users 11 December 2000 Run II Retreat/Operational Issues 29

f Conclusion • What we need to do by 1 March – SDA up and running – Intensity monitors calibration – reduce longitudinal emittance during unstacking – improve coalescing efficiency – MI to Tevatron improved transmission – training – teams in place 11 December 2000 Run II Retreat/Operational Issues 30

f Conclusion • Assuring success in Run IIa – see above – sweat the details – we’re the only show on earth – collisions, luminosity, Higgs, etc. 11 December 2000 Run II Retreat/Operational Issues 31