1 / 23

FFAG RF for muon

FFAG RF for muon. C. Ohmori KEK. Contents. FFAG RF for 10-20 GeV muon Parameters Air-core system Multi-feed scheme by Iwashita FFAG RF for PRISM. FFAG RF for 10-20 GeV muon - RF parameters-. Kinetic Energy : 10 => 20 GeV Radius : 120 m (Circumference 754 m)

hafwen
Download Presentation

FFAG RF for muon

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. FFAG RF for muon C. Ohmori KEK nufact-J

  2. Contents • FFAG RF for 10-20 GeV muon • Parameters • Air-core system • Multi-feed scheme by Iwashita • FFAG RF for PRISM nufact-J

  3. FFAG RF for 10-20 GeV muon -RF parameters- • Kinetic Energy : 10 => 20 GeV • Radius : 120 m (Circumference 754 m) • Longitudinal Emittance : 5 eVs • RF freqeucney : 18 or 24 MHz (Fixed Frequency) • Bucket Height : 10 GeV • h : 0.003(Lattce 1), 0.002(Lattice 2) • Field Gradient 0.55-0.75 MV/m(average) • Cavity Length 1.6 m • Number of Cavity 120 (1 cavity/cell) • Gap Voltage : 1.8-2.43 MV • Beam Pipe : 360 f nufact-J

  4. RF Voltage for 2 X 5.4 GeV Bucket Height High gT is better for RF Voltage! But slow rotation. nufact-J

  5. Design of High Gradient Cavity 1-Air-core cavity- • Length 1.6 m /gap • Outer Diameter : 2m • Type of Cavity : Air –core • Driven by a 150 kW class tetrode • Driving Method: Loop Coupling • Feeding : Direct or Co-axial line nufact-J

  6. SUPERFISH Calculation(24MHz) • Frequency : 24.03 MHz • Shunt Impedance: 3.53 MW 2.2MW/m • Q: 26400 • Max. E field: 7.4MV/m 1.06Kilp. at 1 MV/m • Lattice 1 (Low gT) • Max. E field : 12MV/m1.7 Kilp. at 1.5 MV/m • Lattice 2 (High gT) • Max. E field : 8.3MV/m1.2 Kilp. at 1.1 MV/m nufact-J

  7. nufact-J

  8. Design of Amplifier(24 MHz) • Load : 3.53 MW • Vgap: 2.43 MV • 1 AMP per Cavity • Driven by 150 kW tube • Anode Voltage : 30kV • Peak Cathode Current: 120A (Max. 140 A) • RF Output Power: 0.84MW (duty < 0.16%) • Operation : Class B • Cathode DC Current: 38 A (peak) nufact-J

  9. Operation Line of Tube nufact-J

  10. SUPERFISH Calculation(18MHz) • Frequency : 18.16 MHz • Shunt Impedance: 2.43 MW 1.52 MW/m • Q: 23500 • Max. E field: 10.6MV/m 1.65Kilp. at 1 MV/m • Lattice 1 (Low gT) • Max. E field : 12MV/m1.85 Kilp. at 1.12 MV/m • Lattice 2 (High gT) • Max. E field : 8.7MV/m1.35 Kilp. at 0.82 MV/m nufact-J

  11. nufact-J

  12. Design of Amplifier(18 MHz) • Load : 2.43 MW • Vgap: 1.8 MV • 1 AMP per Cavity • Driven by 150 kW tube • Anode Voltage : 30kV (Max. 40kV) • Peak Cathode Current: 100A (Max. 140 A) • RF Output Power: 0.67MW (duty < 0.16%) • Operation : Class B • Cathode DC Current: 30 A (peak) nufact-J

  13. Air-core cavity • Superfish calculation seems OK (18 and 24 MHz systems), about 1.2 Kilp. • Vacuum tube can deliver enough power. • Many engineering issues • Large cavity (2m f) • Driving method, loop coupling at low frequency • Lifetime of tube: few 10000 hours => 15 tubes (12%) will die in 6 months=> OK nufact-J

  14. Design of High Gradient Cavity 2 -ferrite cavity- • Iwashita proposes a new approach, Multi-Feed by Switching Devices. • Type of Cavity : Ferrite cavity • Driven by FET switch • Driving Method: Loop Coupling • Feeding : Multi-Feed nufact-J

  15. nufact-J

  16. PRISM RF • MA (Magnetic Alloy) Cavity for high field gradient (-300kV/m) at 5MHz • High Power operation of small vacuum tubes • 1 MW by 150 kW tubes nufact-J

  17. MACavity • Will be used for JKJ synchrotron RF cavities • Characteristics of Magnetic Alloy • Thin Tape , 18 mm • High Field Gradient • Voltage limit: Brf <Bsat. (1T) and Voltage per layer < 5 V • High Curie Temperature • Large core, Rectangular Shape, (<4mX1.7m) • Large permeability(about 2000 at 5MHz) • Original Q value is small(0.6). • High Q is possible by cut core configuration • Thickness -35mm (50mm in future) nufact-J

  18. High Gradient Cavity Ferrites Magnetic Alloys B=V/wS=25kV/2pX5MHzX5cmX40cm=400Gauss Vlayer=25kV/(0.4mX0.7/18mm)=1.6V<5V(limit) nufact-J

  19. MA Cavities Himac Cavity: 50cm, 20kV, water cooling driven by 150kW tubes 5kV, CW, driven by 30kW tubes. Barrier Bucket Cavity: 2.6m, 40kV, 6% duty, air cooling, driven by 30kW tubes installed in BNL AGS. KEK-PS MA Cavity: 90cm, 30kV, Cut Core Fluorinate Cooling JKJ RF Cavity: 1.7m, 60kV, Cut Core Water cooling, driven by 600kW tubes PoP FFAG Cavity nufact-J

  20. Parameters of MA Cavity nufact-J

  21. MA core for 150MeV FFAG 1.7m X 0.985m X 30mm MA core nufact-J

  22. nufact-J

  23. Summary • Conceptual Design for 10-20 GeV m FFAG RF system • Air-Core Cavity • Ferrite Cavity using multi-feed • High gT is good for system design (-35% less voltage) but slow acceleration(35 % slower). • Need a prototype system. • System Design for PRISM RF is undergoing. nufact-J

More Related