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Understanding Integrated Luminosity at CLIC: Strategies and Challenges

Delve into the complexities of achieving peak luminosity at CLIC, exploring commissioning time, reliability, stability, and run scenarios. Learn from past projects like ILC, LEP, SLC, and Tevatron to stimulate further reflection and study.

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Understanding Integrated Luminosity at CLIC: Strategies and Challenges

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Presentation Transcript

  1. CLIC Luminosity Overview R. Corsini

  2. Or, rather: What integrated luminosity could we expect from CLIC?

  3. A warning: • I will not answer such question! • Which is indeed a very complex one, hiding behind it a number of other questions: • How long will it take to reach the nominal peak luminosity? • What will be the evolution of the peak luminosity during commissioning (and after)? • How much machine-time will be taken for tuning to peak performance? • How stable would be the machine, once tuned? • What will be the overall machine reliability? • How many, and how long, will be the shut-down periods? • What will be the physics run scenarios (variable energy, specific running conditions...)? • ... And – I fear – I don‘t know the answer to a single one among them. • However, I will attempt to give some hints, by using examples from the past, highlighting similarities and differences between CLIC and other past/existing/planned projects and, overall, trying to stimulate further reflections & studies.

  4. The ILC model (I) From Barry’s talk: • Luminosity ∫Ldt = 500 fb-1 in 4 years • Integrated luminosity was (rightly) considered a design requirement for ILC • Let‘s see how this is linked to peak luminosity, and to commissioning ramp-up

  5. The ILC model (II) During “mature” operation period ∫Ldt→ Lpeak × 1.1 107 sec /year

  6. The ILC model (III) • 1 year commissioning (not accounted for) • 4 years of ramp up in performance (25%, 50%, 75% and 100% of the peak) • Integrated luminosity during this period 500 fb-1 • Is it a reasonable model? • Can it be applied to CLIC?

  7. The LEP lesson (I) • Commissioning, ramp-up and nominal peak luminosity

  8. The LEP lesson (II) • Commissioning, ramp-up and nominal peak luminosity

  9. Uptime: 4059 hours = 1.47 107 sec / year Compared to 1.1 107 sec /year (ILC) Additional factor 26% → 1.4 107 sec / year The LEP lesson (III) • Up-time, availability 22 days (12%) 190 days (54%)

  10. The LEP lesson (IV) • Up-time, availability

  11. The SLC lesson

  12. Another example: Tevatron

  13. Another example: Tevatron

  14. The CLIC upgrades scenario 2nd phase: luminosity increase 500 GeV nominal parameters 4th phase: luminosity increase 3 TeV nominal parameters CLIC nominal ILC 3rd phase: 0.5 to 3 TeV energy upgrade 3 TeV conservative parameters CLIC conservative 1st phase: Initial operation 500 GeV conservative parameters

  15. The CLIC upgrades scenario

  16. The “LHC lesson”

  17. Conclusions This page was intentionally left blank

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