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ATLAS Intensity and Efficiency Upgrade ATLAS USERS MEETING

ATLAS Intensity and Efficiency Upgrade ATLAS USERS MEETING. Speaker: Mike Kelly Physics Division May 15, 2014. The Present ATLAS Accelerator Cryomodules 8 Cryomodules , 47 SC Accelerating Cavities. 109 MHz Energy Upgrade cryomodule. CARIBU. 5. 109 MHz Module. 5. 2. 3. 1. 2009.

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ATLAS Intensity and Efficiency Upgrade ATLAS USERS MEETING

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  1. ATLAS Intensity and Efficiency UpgradeATLAS USERS MEETING Speaker: Mike Kelly Physics Division May 15, 2014

  2. The Present ATLAS Accelerator Cryomodules 8 Cryomodules, 47 SC Accelerating Cavities 109 MHz Energy Upgrade cryomodule CARIBU 5. 109 MHz Module 5. 2. 3. 1. 2009 4. Split-ring cryomodules 1. 60 MHz RFQ 2. PII Cryomodules 3. 72 MHz Module 2013 1992 2013

  3. Clean Assembly (left) and Cryogenics Assembly (right) for ATLAS Intensity Upgrade Cryomodule (2013) Clean room assembly (south side of beamline) Assembly stand (north side of beamline) Jan. 2013 June 2013

  4. Charged Particle Acceleration in a 2-gap Accelerating Cavity z q

  5. RF Surface: (Simplified) Niobium Surface, Tc=9.2 Kelvin Superconductivity ~40 nm

  6. Electropolishing System for Low-beta Cavities A unique ANL technical capability to electropolish cavities as the final step in fabrication

  7. Subcomponents: RF Couplers 4 kW RF Power ATLAS 4 kW Couplers

  8. Issue of Maintaining the Clean Vacuum Space (a.k.a. Protection from the ATLAS Users) • 80 Kelvin ~1/2 meter long liquid nitrogen cooled cold traps installed at the entrance and exit for clean cryomodules • Volatiles, water, particulates adsorb to the surface of a 2.5” cm diameter copper tube • Gate valves at the entrance and exit of the cryomodule are interlocked to cold trap ion gauges • A fast acting valve (~10 mS) will isolate experimental areas from the accelerator in the event of a vacuum accident Cold trap Fast Valve RGA Cryomodule exit valve

  9. The First Beam Delivered with the 72 MHz Intensity Upgrade Cryomodule First beam to experiment 20Ne6+ on Feb. 18, 2014 (Ave. Cavity Voltage 2 MV/cavity, Ave. Power per Cavity 1.3 Watts) Also of note, all cavities stable with respect to quench with EACC>12 MV/m, average value for field emission onset, EACC~9 MV/m (EPEAK~45 MV/m)

  10. Testing at Liquid Helium Temperatures: Q versus E (Most Commonly Used Figure of Merit) Present Operations 2.5 MV/cavity

  11. Context and Impact: SARAF Proton/Deuteron Accelerator In operation since 2009

  12. Context and Impact: MSU Re-Accelerator (ReA3) In operation since 2011 C Planned for May 2014

  13. Context and Impact: ISAC-II Heavy-ion Linac, 6 Cryomodules Commissioned 2006-2010

  14. Team for ANL SRF Cavity/Cryomodule Work Peter Ostroumov – Accelerator R&D Leader Zachary Conway – Cryomodule assembly Michael Kelly – Clean assembly, cavity testing Scott Gerbick – Electropolishing design, up-to-air system Tom Reid – Chemistry operations Ryan Murphy – High-pressure rinsing, single-cavity assembly Mark Kedzie – Vacuum systems, cryomodule assembly Sang-hoon Kim – Alignment, diagnostics Gary Zinkann – SRF Cavity Testing Brahim Mustapha – Simulation support (e.g. cavity tuning) Sergey Kutsaev – Power simulations & qualification Also Acknowledge Efforts of Steve MacDonald – Cryogenics upgrade Sergey Sharmentov– New RF Control System

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