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Exploring ERL: Collaborative Beauty and Innovation in Particle Acceleration

Discover the fascinating world of Energy Recovery Linacs (ERLs) for the Large Hadron electron Collider (LHeC) and the potential for collaboration in advancing particle acceleration technology. Delve into the efficiency, power consumption, frequency options, and research challenges in this cutting-edge field.

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Exploring ERL: Collaborative Beauty and Innovation in Particle Acceleration

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  1. The Beauty of an ERL for LHeC…and the interest to collaborate Erk Jensen, Ed. Ciapala (with lots of material provided by Rama Calaga, Joachim Tückmantel and many others) ASTeC/Cockcroft visit, 5 Sept 2012

  2. The Beauty of the ERL • e-beam power at IP: 384 MW (!) • Total power consumption: 80 MW! • “Efficiency” of 480% LHeC STFC/ASTeC Meeting

  3. LHeC ERL f Options Condition: n * 120.237 MHz 1.322 GHz (n=11) 721 MHz (n=6) SPL cryomodule 704 MHz BNL 704 MHz cavity (20 MV/m with high Q0 demonstrated) LHeC STFC/ASTeC Meeting

  4. Which frequency? Advantages 700 MHz Advantages 1300 MHz Synergy ILC, X-FEL Cavity smaller Larger R/Q Smaller RF power (assuming same Qext) Less Nb material needed • Synergy SPL, ESS, JLAB, eRHIC • Smaller BCS resistance • Less trapped modes • Smaller HOM power • Beam stability • Smaller cryo power • Power couplers easier • IOT and SSPA available/easier Personal preference: 700 MHz (stability threshold at higher beam current)! LHeC STFC/ASTeC Meeting

  5. Low Energy ERL’s/Test Facilities LHeC STFC/ASTeC Meeting

  6. Interesting, challenging R&D • ERL: (almost) no beam loading in steady state, so potentially small RF power. • R&D for highest possible Q0! • Technology? Thin film? Ingot? • R&D: How large Qext do you dare? • R&D: How to get to steady state? • influence of bunch amplitude jitter, phase jitter? • Compensation of SR radiation loss … • failure modes • … • … LHeC STFC/ASTeC Meeting

  7. An ERL Test facility @ CERN… … could help answer some of these questions! But also: • Physics motivation: • ERL demonstration, FEL, γ-ray source, e-cooling demo! • Ultra-short electron bunches • One of the 1st low-frequency, multi-pass SC-ERL • synergy with SPL/ESS and BNL activities • High energies (200 … 400 MeV) & CW • Multi-cavity cryomodule layout – validation and gymnastics • Two-Linac layout (similar to LHeC) • MW class power coupler tests in non-ER mode • Complete HOM characterization and instability studies! • Cryogenics & instrumentation test bed • … for CERN RF Group to re-establish practical expertise in SC-RF, train new people and get ready for the future. LHeC STFC/ASTeC Meeting

  8. ERL-TF @ CERN SCL2 Dump 200-400 MeV ERL Layout 4 x 5 cell, 721 MHz SCL1 5 MeV Injector ~6.5 m LHeC STFC/ASTeC Meeting

  9. ERL-TF (300 MeV) - Layout DE = 75 MeV 5 MeV DE = 75 MeV DC = l/2 5 MeV Two passes ‘up’ + Two passes ‘down’ Alex Bogacz ERL-TF at CERN Mtg, Jefferson Lab, August 21, 2012

  10. ERL-TF (300 MeV) - Layout DE = 75 MeV 5 MeV DE = 75 MeV DC = l/2 5 MeV Two passes ‘up’ + Two passes ‘down’ Alex Bogacz ERL-TF at CERN Mtg, Jefferson Lab, August 21, 2012

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