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In Through the Out Door: Reconfiguring the NRL TEAMS Facility

In Through the Out Door: Reconfiguring the NRL TEAMS Facility. D.L. Knies, K.S. Grabowski, and C. Cetina Naval Research Laboratory, Washington, DC 20375. Outline. Introduction to TEAMS at NRL Addition of IMS-6f S vs. U bend and ramifications Beam Optics for the RBS and Implant Beamlines

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In Through the Out Door: Reconfiguring the NRL TEAMS Facility

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  1. In Through the Out Door:Reconfiguring the NRL TEAMS Facility D.L. Knies, K.S. Grabowski, and C. Cetina Naval Research Laboratory, Washington, DC 20375

  2. Outline • Introduction to TEAMS at NRL • Addition of IMS-6f • S vs. U bend and ramifications • Beam Optics for the RBS and Implant Beamlines • Conclusions

  3. NRL TEAMS Facility 110 feet Pretzel Magnet Mass Filter 3˚ Bend Selects Charge State 30˚ Electrostatic Analyzer Pelletron Accelerator Si +3 MV U - ions + ions C stripper foil Plasma Ion Source (4He) Beam Line Switching Magnet Switchable 45˚ electrostatic analyzer 27˚ Bend Ion Implantation Beam Line (500 keV–12 MeV) Sample 60 keV Accel. 40 cathode sputtering ion source 55˚ Bend Surface Analysis Beam Line SIMS Ion Source

  4. Key Elements of the NRL TEAMS Facility Along with fiber optic telemetry/control and LabView user interface, provides • Stable and convenient operation. • Isotope analysis with 10-15 sensitivity (e.g., 14C) • Trace element analysis with 10-11 sensitivity for multiple elements in parallel Pretzel Magnet Input H Si Fe Ce U Symmetry axis Output Factor of 8 Mass Range Mass Resolution M/M >2500 1.5 Meter Focal Plane

  5. IMS 6f as a Clean Ion Source

  6. Current Low End Configuration PretzelMagnet & Chopper EQT Switching ESA  8 ft MC-SNICS

  7. Current Configuration 3º Bend for Charge State Selection 3º Bend

  8. New Configuration 15º Bend for Charge Selection, Tank Flipped 180º

  9. New Injector Requirements • Maintain current capability (40-70 keV injection) • TEAMS (MC-SNICS) • 14C AMS (MC-SNICS) • Ion Implantation (tross/MC-SNICS) • RBS and ERD (tross) • HIBS (MC-SNICS) • Direct injection form IMS 6f (10 keV Injection) • Variable Terminal Voltage Operation

  10. Einzel Lenses in Tank

  11. 10 KeV to 60 KeV Injection 10 keV :1 MV Stripper L.E. Tube Einzel #1 Einzel #2

  12. 10 KeV to 60 KeV Injection 10 keV : 2.3 MV Stripper L.E. Tube Einzel #1 Einzel #2

  13. 10 KeV to 60 KeV Injection 40 keV :1 MV Stripper L.E. Tube Einzel #1 Einzel #2

  14. 10 KeV to 60 KeV Injection 60 keV :3 MV Stripper L.E. Tube Einzel #1 Einzel #2

  15. SIMION 7.0 in Transport

  16. 10 KeV C- Injection to Terminal 2.7 MV L.E. Tube Einzel #1 L.E. ESA Stripper Pretzel Einzel Einzel #2 Calculated, using SIMION 7.0 Electric Fields to Model the Einzel Lenses and Accelerator Tubes in Transport.

  17. 60 KeV C- Injection to Terminal 2.7 MV L.E. Tube Einzel #1 L.E. ESA Stripper Pretzel Einzel Einzel #2 Calculated, using SIMION 7.0 Electric Fields to Model the Einzel Lenses and Accelerator Tubes in Transport.

  18. 12C Optics 2.7 at High End 0.1% Momentum Spread at 2.7 MV Terminal 30º ESA 15º Bend Split-Pole H.E. Tube HE EQT 1 HE EQT 2 Stripper Calculated, using SIMION 7.0 Electric Fields to Model the Einzel Lenses and Accelerator Tubes in Transport.

  19. 15º Charge State Selection Source Voltage = 0.07 MV, Terminal Voltage = 3.00 MV, Total Plate Voltage 72.5 kV, Gap = 50 mm, Drift 2.90 M

  20. NRL High Energy Beamline Split-pole Stripper to Split-pole To form an angle- and energy-focusing spectrometer we require the image at x3 to be independent of k0. or The split-pole is a complicated magnet with, and . The -1/3 magnification requires an energy-to-charge dispersion from our high energy tube and compound ESA of ~ 2.8.

  21. U-Bend vs. S Bend2.7 MV Terminal 12C, q3+, With and without 0.1% Momentum Spread Focal Plane Energy Dispersion S- or U-Bend no spread U-Bend = 0.7 mm/% S-Bend = 10 mm/% S-Bend 0.1 % U-Bend 0.1 %

  22. U-Bend Bend Focal Plane m = 0.74% and δk = 0.0% m = δk = 0.0% m = 0% and δk = 0.1% m = 0.74% and δk = 0.1%

  23. 27º Implant Beamline2.7 MV Terminal 12C, q3+, with and without 0.1% Momentum Spread Switching Magnet Quadrupole Doublet Quadrupole Doublet EndStation Neutral Trap Scanner

  24. 55º Beamline2.7 MV Terminal 12C, q3+, with and without 0.1% Momentum Spread Switching Magnet Quadrupole Doublet Quadrupole Doublet End Station

  25. Conclusions • New IMS-6f as TEAMS ion source • Designed injector that can do it all • Improved charge state selection • Using all-natural focusing for the AMS beamline (removed two quads and ~10 meter of flight path) • Designed an energy-insensitive mass focusing spectrometer • Using Split-pole as the analyzing magnet for RBS and Implant Beamlines Work supported by ONR and NASA

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