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Storage Rings Group Meeting

Storage Rings Group Meeting. Steve Werkema 10 March 2010. Our piece of the action. P1-P2-AP1-AP3. Accumulator. Acc - Deb. Debuncher. Abort line(s). Mu2e Cycle (Hybrid A). Beam intensity ( Tp ). 0 4 8 12. 0 4. Momentum Stacking. 0 1 2 3 4 5 6 7 8 9.

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Storage Rings Group Meeting

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  1. Storage Rings Group Meeting Steve Werkema 10 March 2010

  2. Our piece of the action • P1-P2-AP1-AP3 • Accumulator • Acc - Deb • Debuncher • Abort line(s)

  3. Mu2e Cycle (Hybrid A) Beam intensity (Tp) 0 4 8 12 0 4 Momentum Stacking 0 1 2 3 4 5 6 7 8 9 Acc injection every 66.7 ms Bunch with 2.5 MHz RF system Debuncher injection every ~150 ms Time (15 Hz ticks) 4 single (2.5 MHz) bunch extractions Accumulator Debuncher

  4. Momentum Stackingin the Accumulator Injection Central Orbit t = 0 sec One Booster batch injected. Decelerated with 52.8 MHz RF and debunched near cent orb. 53 MHz t = 67 msec 2nd batch injected and decelerated, debunched. 53 MHz DC t = 133 msec 3rd batch injected and decelerated, debunched. 53 MHz DC DC t = 133+ msec Bunched with 2.5 MHz (h=4) RF and extracted one bunch at a time 2.5 MHz

  5. ESME Simulations – Scenario-I Bunching using Barrier saw-tooth rf and 2.5 MHz rf. Beam is ready for the Mu2e experiment in 33 ms after the 3rd injection t=0.146 sec t=0.152 sec Saw-tooth rf using Barrier RF t=0.146s after the 1st injection Partial bunching with Barrier rf T= 0.152sec ~100% Duty factor Four bunches at t= 0.167 sec Capture with 2,5MHz rf, t= 0.167sec Vrf (2.5MHz) = 40kV t=0.167 sec FW= 100 MeV E(RMS)= 25MeV (RMS)~53ns, FW~220ns Chandra Bhat

  6. Implications • We need three 15 Hz kickers: • Accumulator injection • Accumulator extraction • Debuncher injection • Momentum stacking requires Accumulator extraction at zero dispersion {i.e. D-A (now A-D) line moves} • New RF systems in Accumulator and Debuncher • High intensities  space charge, coherent instabilities, radiation Single 2.5 MHz bunch extraction  400 nsec flattop

  7. Mu2e Organization 1 Mu2e project (Ron Ray) 1.1 Mu2e Management 1.2 Mu2e Accelerator (Mike Syphers) 1.2.1 Project Management 1.2.2 Proton Source (Bill Pelico) 1.2.3 Recycler (Ioanis Kourbanis) 1.2.4 Storage Rings (Steve Werkema) 1.2.5 Radiation Safety Improvements (Tony Leveling) 1.2.6 Resonant Extraction System (Leo Michelotti) 1.2.7 External Beamline (Carol Johnstone) 1.2.8 Extinction (Eric Prebys) 1.2.9 Target Station (Rick Coleman) 1.2.10 Operations Preparation 1.3 Conventional Construction (Tom Lackowski) 1.4 – 1.9 Experiment components 1.10 Project Management (Ron Ray)

  8. 1.2.4 Storage Rings Organization (1) 1.2.4 Storage Rings (Steve Werkema) 1.2.4.1 Storage Rings R&D (Werkema/Nagaslaev) 1.2.4.1.1 Momentum Stacking R&D (Peterson/Bhat) 1.2.4.1.2 Bunch formation R&D (Peterson/Bhat) 1.2.4.1.3 Injection / extraction kicker R&D (Dave VanderMeulen) 1.2.4.1.4 Space charge studies (Steve Werkema) 1.2.4.1.5 Coherent instabilities 1.2.4.1.6 Lattice adjustments 1.2.4.1.7 Accumulator / Recycler energy match 1.2.4.1.8 Beam studies 1.2.4.2 Beam lines (Jim Morgan) 1.2.4.2.1 Recycler to Accumulator beamline modifications 1.2.4.2.2 Ring-to-Ring transfer line 1.2.4.2.3 Injection and Extraction

  9. 1.2.4 Storage Rings Organization (2) 1.2.4 Storage Rings (Steve Werkema) 1.2.4.1 Storage Rings R&D (Werkema/Nagaslaev) 1.2.4.2 Beam lines (Jim Morgan) 1.2.4.3 RF Systems (Dave Peterson) 1.2.4.3.1 Low Level RF 1.2.4.3.2 Accumulator 2.5 MHz system 1.2.4.3.3 Accumulator 53 MHz system 1.2.4.3.4 Accumulator broadband system 1.2.4.3.5 Accumulator RF extraction kicker synch system 1.2.4.3.6 Acc-Deb transfer phase jump system 1.2.4.3.7 Debuncher 2.4 MHz system 1.2.4.3.8 RF systems for beam studies/tuning

  10. 1.2.4 Storage Rings Organization (3) 1.2.4 Storage Rings (Steve Werkema) 1.2.4.1 Storage Rings R&D (Werkema/Nagaslaev) 1.2.4.2 Beam lines (Jim Morgan) 1.2.4.3 RF Systems (Dave Peterson) 1.2.4.4 Instrumentation (Dave Peterson) 1.2.4.4.1 DC beam measurement 1.2.4.4.2 Debuncher tune measurement 1.2.4.4.3 BPM upgrades 1.2.4.4.4 Spill monitoring 1.2.4.5 Cooling removal (Brian Drendel) 1.2.4.6 Beam Damper systems (Dave Peterson) 1.2.4.7 Beam abort system (Jim Morgan) 1.2.4.8 Infrastructure improvements (Brian Drendel)

  11. Work to be Done • Immediate goal is to get CD-1 (1 Mar. 2011) • CD-1 requires a CDR (Conceptual Design Report) • CDR contributions submitted by 1 Dec. 2010 • Conceptual design of all systems • Resource loaded schedule that achieves the design  Work needs to begin nowto establish a working design and make cost estimates. Good news: Now is your chance to leave your mark on this experiment – changes will be much more difficult after CD-1 Bad news: We’ll have to live with all of the bad decisions made during the next year. Already in progress: NOnA kicker design (Chris Jensen) RF simulations (Chandra Bhat) Extraction R&D (Leo Michelotti et.al.)

  12. Beam Studies • Measure Debuncher betatron resonance strengths and stop band widths • 2.5 MHz bunch capture in Accumulator • Extinction via momentum collimation test with 2.5 MHz bunches in the Accumulator (How do we measure this?) • Determine why reverse protons blow up longitudinally on the Accumulator injection orbit.

  13. Project Management Wisdom of the Day Future Meeting schedule ?

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