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Timing Issue for Mercury Target

Explore the timing issues for Mercury Target operation with super cycle structures and required precision adjustments at different beam shots and trigger delays. Understand the timing constraints and tolerance levels for beam operation.

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Timing Issue for Mercury Target

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  1. Timing Issue for Mercury Target 2006. 6. 14 Hee Jin Park (SUNY Stonybrook, BNL) Ilias Efthymiopoulos (CERN) Adrian Fabich (CERN)

  2. Super Cycle Structure SC 1 SC N SC 2 MERIT MERIT MERIT • • • ••• • • ~20 s ~20 s ~20 s Super Cycle User MERIT MERIT ••• ••• User Cycle1 User Cycle n User Cycle2 • • User Cycle15 Δt= n (# of slot)×1.2s Super Cycle Length (Currently foreseen for 2007) 16.8s (FT) 18s (FT+CNGS commissioning) 22.8s (FT+CNGS LI) 34.8s (FT+CNGS HI) 43.2s (LHC filling) Run for days, 2006 Run for 30 min or test period

  3. PS User Cycle warning xx (time delay to beam ms) : 2ms B(t) • • Triggering Signal : TTL standard logic • 800 ms • Finalized with hardware 1.2 s • time t=0 for MERIT Jitter : 250 ns Extraction time Beam Shape & Structure 50 ns Bunch length : 50 ns ••• • 131.25 ns ~800ms

  4. Time Delay Camera Trigger : n×1.2 s + 800 ms Super Cycle : 20 s – Time Delay Magnet Trigger Delay Unit Hg Trigger Proton Synchrotron MERIT ••• Distance ≈ 400 m Cable Delay = 5 ns/m = 2 μs/400m Beam Travel Delay = 3.3 ns/m = 1.32 µs/400m Signal to Beam Delay ≈ 1.32 – 2 = - 0.68 µs/400m SC for MERIT SC for MERIT • • • ••• 20 s 20 s Signal to MERIT Adjust at Next Beam Shot Beam

  5. Operation Flat Top Region of Magnetic Field : 8.5 s ~ 9.5 s (1 sec) ? What precision is required ? Tolerance ? • • Beam shot ? Mercury Jet Velocity Profile at Target Velocity V=20m/s • • 8.5 s Precision ? Tolerance ? Beam shot ? • Flat Top Region of Steady Jet flow : 8.5 s ~ 9.5 s (1 sec) ? 9.5 s Time 10 s

  6. Signal Sequence for Mercury Target SC Low Intensity Regular Intensity • • • Beam 20 s Δt Trigger Camera Delay : 20s - n×1.2 s - 800 ms – Jitter -1μs ± 300 ns Trigger Hg Loop Delay : Ex. 20 s – 9.0 s ± 1ms Trigger Magnet Delay : Ex. 20 s – 9.0 s ± 1ms Trigger Detector 20 s Delay : 20s - n×1.2 s - 800 ms – Jitter -1μs ± 300 ns variable Beam Inhibit (On/Off) Δt≤3.6 Δt_start ≥ 3.6s Δt_stop No Beam to MERIT MERIT Beam

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