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O. Kester, Jahrestagung des KHuK, Bad Honnef, 30.11.2012 FAIR accelerator R&D Oliver Kester GSI Helmholtzzentrum für Schwerionenforschung Darmstadt and.

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Presentation on theme: "O. Kester, Jahrestagung des KHuK, Bad Honnef, 30.11.2012 FAIR accelerator R&D Oliver Kester GSI Helmholtzzentrum für Schwerionenforschung Darmstadt and."— Presentation transcript:

1 O. Kester, Jahrestagung des KHuK, Bad Honnef, FAIR accelerator R&D Oliver Kester GSI Helmholtzzentrum für Schwerionenforschung Darmstadt and IAP Goethe-Universität Frankfurt

2 O. Kester, Jahrestagung des KHuK, Bad Honnef, Outline Introduction Challenges FAIR heavy ion accelerators Preparation of the injectors at GSI Accelerator challenges and R&D High current ion sources Beam dynamics and cavities Injection / Extraction Cryomodules SIS100 Outlook

3 O. Kester, Jahrestagung des KHuK, Bad Honnef, FAIR accelerator challenges FLAIR Superconducting magnets Rf-cavities Beam cooling Diagnostic and XHV at highest intensities

4 O. Kester, Jahrestagung des KHuK, Bad Honnef, UNILAC upgrade High power (high intensity), short pulses Increase of beam brilliance (Beam current / emittance) Increase of transported beam currents Improvements of high current beam diagnostics / operation SIS 18 upgrade Fast ramping, enhanced intensity per pulse Increase of injection acceptance Improvement of lifetime for low- charged U-ions Increase of beam-intensity per time due to reduction of SIS18- cycle time Exchange of 35 years old Alverez accelerator With modern interdigital H-type structures Higher intensities 28 GHz ECRIS Preparation of the injector chain

5 O. Kester, Jahrestagung des KHuK, Bad Honnef, Filament drivenVacuum Arc driven MUCIS, MUCIS New, CHORDIS MEVVA, VARIS Working material: Gases Metalls and Gases High Duty factor PIG Metalls and Gases GSI high current sources

6 O. Kester, Jahrestagung des KHuK, Bad Honnef, VARIS (Vacuum Arc Ion Source) Optimized for Uranium (67% of 238U 4+ ) Emission current density 170 mA/cm kV kV 20 mA in front of the RFQ 9 mA behind the RFQ Vacuum Arc Driven Sources Improving the beam quality at plasma extraction Improvement of beam transport Lifetime of cathodes 3 Hz operation

7 O. Kester, Jahrestagung des KHuK, Bad Honnef, UNILAC modifications and the HE-linac Ion source and beam transport upgrade 4 Alvarez tanks, almost 40 years old exchange by modern IH-structures Charge state stripper technology higher charge states (high intensities) High intensity beam diagnostics

8 O. Kester, Jahrestagung des KHuK, Bad Honnef, H-Mode Resonators for LINACs E-Field B-Field E-Field IH-Structure (interdigital H-type) 4-vane RFQ IH-RFQ CH-Structure (cross bar H-type)

9 O. Kester, Jahrestagung des KHuK, Bad Honnef, The FAIR Proton Injector Beam Energy Beam Current (design/oper.) Beam Pulse Repetition Rate Frequency Norm. Emittance at output Momentum Spread Beam Loading (peak) RF Power (peak) Klystron (3 MW Peak Power) Solid State Amplifier (50 kW) Total Length (RFQ + CH) 70 MeV 70 / 35 mA 36 µs 4 Hz MHz 2.1 / 4.2 µm ± MW 2.5 MW m CH-DTL Klystron

10 O. Kester, Jahrestagung des KHuK, Bad Honnef, Charge state stripper for intense heavy ion beams C-foil stripper - short lifetime at highest intensities, but highest charge states gas stripper - High intensity capabilities, but lower charge states - Equilibrium charge state (efficiency) MIT Plasma window in a test setup at BNL Plasma stripper - Need to increase the gas density – plasma window for differential pumping - Or dense plasma channel separated by plasma windows

11 O. Kester, Jahrestagung des KHuK, Bad Honnef, Emittance transfer Reminder: B x/y := (q/A)*Current / Emittance x/y emittance transfer from horizontal to vertical plane should help to increase the injection efficiency transfer should preserve x y

12 O. Kester, Jahrestagung des KHuK, Bad Honnef, The Synchrotron Quadrupole Sextupole bending correction focusing Magnetic field and rf-frequency are ramped synchronous to the particle energy. Magnetic field and rf-frequency are ramped synchronous to the particle energy. Magnets Dipole

13 O. Kester, Jahrestagung des KHuK, Bad Honnef, SIS high current (> 4 kA) quadrupoles SIS100 Injection/Extraction4 low current (< 1 kA) quadrupoles Main Characteristics of the SIS100 quadrupole: B = 27 T/m, Effective length = 1,3 m A modules comprises: two quadrupoles, multipole corrector, steerer, chromaticity sextupole cryocollimator beam position monitor (BPM) Complex system concerning: Girders, bus bars helium headers thermal shield, cryostat vacuum chamber SIS100 Quadrupole modules

14 O. Kester, Jahrestagung des KHuK, Bad Honnef, Cold beam position monitors In SIS100 quadrupole modules Signal transfer from 4 K level to room temperature level Cold BPMs QD BPM ST QD

15 O. Kester, Jahrestagung des KHuK, Bad Honnef, Cryocatcher in Quadrupole Module SIS100 Qaudrupole Cryostat L. Bozyk

16 O. Kester, Jahrestagung des KHuK, Bad Honnef, Dynamic Vacuum effect and collimation P. Puppel

17 O. Kester, Jahrestagung des KHuK, Bad Honnef, p trans t circulating, cooled beam rf-Barriers Creation of a gap for injection of additional particles New injected bunch Cooling Circulation time Stacking of particles in the FAIR storage rings

18 O. Kester, Jahrestagung des KHuK, Bad Honnef, Fast bunch rotation in the CR Challenges: Short bunch from SIS100 (50 ns) For stochastic cooling de-bunching required High voltage (200 kV) required for fast rotation and reduction of momentum spread after production target Gap voltage 40 kV Length 1 m Rotation time ~ 100 s

19 O. Kester, Jahrestagung des KHuK, Bad Honnef, Summary FAIR accelerator developments High current ion sources and optimized beam transport Cavity development for LINACS – H-type cavities p-Linac and HE-Linac Charge state stripper technologies Emittance transfer – injection into synchrotrons Cryogenic SIS100 modules and dynamic vacuum effect Accumulation of secondary particles via barrier bucket injection


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