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Design and Feasibility of Beam Instrumentation for 50 ns Ion Injection

This document outlines the design and feasibility study of beam instrumentation modifications for 50 ns ion injection in the LHC, focusing on the upgrades during LS2. It covers the status of existing Beam Transfer Views (BTVs), Beam Loss Monitors (BLMs), Beam Position Monitors (BPMs), and fast kicker synchronization strategies. Key findings show the need for new dump locations, updated electronics for precise intensity measurements, and enhancements to diagnostics capability. A cost estimate of approximately 70k CHF is provided, emphasizing the importance of integrating systems to optimize performance.

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Design and Feasibility of Beam Instrumentation for 50 ns Ion Injection

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  1. Beam instrumentation for 50nsec ion injection“Design and feasibility for LS2” • Outline: • BTVs • BLMs • BPMs • Fast kicker synchronisation • Conclusions Lars K. Jensen BE/BI

  2. Existing BTVs in LSS1 • Camera: radiation-hard “Vidicon” • Mainly for observation (beam is there) • Electronics and cables: • Consolidated during LS1 • Review screens • Radiation issue remains Lars K. Jensen BE/BI

  3. Position of Ion Dump #1 • 2m available for new dump (with BTV) • MDV, BPV and BLM no-longer to be used after LS2? ~2m available Lars K. Jensen BE/BI

  4. Position of Ion Dump #2 • Space available in sector 12160 (upstream of Schottky monitors) • Do we still need/use the BPSH/BPSV after LS2? • Viable option in terms of optics etc ? • Expect it to be fixed (no movement required) Lars K. Jensen BE/BI

  5. BLMs in LSS1 • All normal quadrupoles • Dedicated BLMs: Additional BLMs to be specified as required for Ion injection and beam-dump Lars K. Jensen BE/BI

  6. Injection of Batch 11 BPMs Position • ‘shoe-box’ orbit pick-ups in LSS1 • BPM on every quadrupole (BPV.121?) • ‘Bad’ BPD pickups replaced this shutdown • Minimum detectable intensity levels: • Single bunch ~2E9 charges • Batch ~1E8 charges • New electronics (under development/test) will provide: • Trajectory: 50 first turns (for each of up 13 programmable gates) • Orbit: averaged values at 1KHz (for 1 selected gate) for cycles up to 100s • LHC-type pick-ups • BPMs in position 513, 515 and 519 • Bunch by bunch programmable (25nsec slot) for many turns • Used to diagnose injection kicker fine timing Intensity Lars K. Jensen BE/BI

  7. Fast kicker synchronisation • Present MKP (protons) diagnostics uses analogue signal from: • BCTFI.100302 (TT10) (+ scintillator on BTV) • BCTFS.11640 (first turn) • Propose to use the same for ions Lars K. Jensen BE/BI

  8. Conclusions • Quick overview of BI equipment in LSS1 • BTV to be integrated on new dump • Cost estimate ~70kCHF • Best place to be identified • BLMs to be specified and placed for new injection septum and dump • New BPM electronics expected to bring new functionalities for injection oscillation and covering long cycles Lars K. Jensen BE/BI

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