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Institute for Nuclear Physics Ralf Gebel – PSTP 2007 – 10.-14.September 2007 Facility overview Ion sources at COSY R&D details.

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Presentation on theme: "Institute for Nuclear Physics Ralf Gebel – PSTP 2007 – 10.-14.September 2007 Facility overview Ion sources at COSY R&D details."— Presentation transcript:

1 Institute for Nuclear Physics (IKP)r.gebel@fz-juelich.de Ralf Gebel – PSTP 2007 – 10.-14.September 2007 Facility overview Ion sources at COSY R&D details Cs ionizer Extraction Actual investigations (ABS, LSP) Summary and outlook Polarized H - and D - Beams at COSY/J ü lich

2 Institute for Nuclear Physics (IKP)r.gebel@fz-juelich.de Ralf Gebel – PSTP 2007 – 10.-14.September 2007 The COSY Facility 0.6.. 3.65 GeV/c p and d polarized beams beam cooling internal and external detectors for the investigation of nuclear quark structure and dynamics, fundamental symmetries and e.g. exotic mesons, rare decays COoler SYnchrotron

3 Institute for Nuclear Physics (IKP)r.gebel@fz-juelich.de Ralf Gebel – PSTP 2007 – 10.-14.September 2007 The COSY Injector

4 Institute for Nuclear Physics (IKP)r.gebel@fz-juelich.de Ralf Gebel – PSTP 2007 – 10.-14.September 2007 Light Ions for COSY

5 Institute for Nuclear Physics (IKP)r.gebel@fz-juelich.de Ralf Gebel – PSTP 2007 – 10.-14.September 2007 Charge exchange reaction H 0 (D 0 ) + Cs 0  H - (D - ) + Cs + The COSY Polarized Source RF discharge Thermal ionizer 38 K 1150 K 550 K

6 Institute for Nuclear Physics (IKP)r.gebel@fz-juelich.de Ralf Gebel – PSTP 2007 – 10.-14.September 2007 The COSY Polarized Source

7 Institute for Nuclear Physics (IKP)r.gebel@fz-juelich.de Ralf Gebel – PSTP 2007 – 10.-14.September 2007 Atomic Beam Source Cesium Ionizer and Beam Line The COSY Polarized Source (II)

8 Institute for Nuclear Physics (IKP)r.gebel@fz-juelich.de Ralf Gebel – PSTP 2007 – 10.-14.September 2007 Cs Ionizer – Replacement of the Prototype S. Lemaitre’s and R. Reckenfelderbäumer’s Ph.D. theses NIM A 408, 345 (1998)

9 Institute for Nuclear Physics (IKP)r.gebel@fz-juelich.de Ralf Gebel – PSTP 2007 – 10.-14.September 2007 Tungsten Ionizer

10 Institute for Nuclear Physics (IKP)r.gebel@fz-juelich.de Ralf Gebel – PSTP 2007 – 10.-14.September 2007 Next Iterations M. Eggert’s Ph.D. thesis NIM A 454, 514 (2000)

11 Institute for Nuclear Physics (IKP)r.gebel@fz-juelich.de Ralf Gebel – PSTP 2007 – 10.-14.September 2007 Pulsed Version

12 Institute for Nuclear Physics (IKP)r.gebel@fz-juelich.de Ralf Gebel – PSTP 2007 – 10.-14.September 2007 dc and pulsed operation (0.5- 3 Hz) 6 mA routinely @ 45keV – 25 ms 0.5 Hz up to 1500 hours continuous operation for COSY and experiments 3 sources for exchange Development of Cs + Sources -4 kV -5 kV -6 kV -7 kV -7.5 kV 0 4 8 1212 mA Emitted Cs + current 5.5 mA 20 ms 55°C 60°C 65°C

13 Institute for Nuclear Physics (IKP)r.gebel@fz-juelich.de Ralf Gebel – PSTP 2007 – 10.-14.September 2007 A set of computer controlled wire scanners for Cs +/o diagnosis to judge the beam and the ionizer quality to optimize Cs +/o transmission space charge compensation by adding Argon Focusing the Cesium Beam

14 Institute for Nuclear Physics (IKP)r.gebel@fz-juelich.de Ralf Gebel – PSTP 2007 – 10.-14.September 2007 Field Gradient inside the Solenoid 1994 2005

15 Institute for Nuclear Physics (IKP)r.gebel@fz-juelich.de Ralf Gebel – PSTP 2007 – 10.-14.September 2007 Beam Current vs.  U and  B 

16 Institute for Nuclear Physics (IKP)r.gebel@fz-juelich.de Ralf Gebel – PSTP 2007 – 10.-14.September 2007 Extraction and Deflection

17 Institute for Nuclear Physics (IKP)r.gebel@fz-juelich.de Ralf Gebel – PSTP 2007 – 10.-14.September 2007 Improvement of Beam Extraction H - Cs +, Cs 0 Mounting the extraction elements

18 Institute for Nuclear Physics (IKP)r.gebel@fz-juelich.de Ralf Gebel – PSTP 2007 – 10.-14.September 2007 Focusing the Atomic (H, D) Beam Monte-Carlo simulation Integration over r, r’, spin and velocity 0 5 10 15 20 25 Radius [mm] 0.00.51.01.5 Distance to 2nd hexapole [m] 60 % 70 % 80 % 90 % Solenoid

19 Institute for Nuclear Physics (IKP)r.gebel@fz-juelich.de Ralf Gebel – PSTP 2007 – 10.-14.September 2007 Exchange of the EM hexapoles EM diameter 220 mm PM diameter 80 mm 220 mm M. Altmeier’s and O. Felden’s Ph.D. theses NIM A 626, 117 (1997)

20 Institute for Nuclear Physics (IKP)r.gebel@fz-juelich.de Ralf Gebel – PSTP 2007 – 10.-14.September 2007 Neutral Beam Profile Scanner Estimation of the atomic beam size and position by using the Cs scanner inside the atomic beam part and a compression tube

21 Institute for Nuclear Physics (IKP)r.gebel@fz-juelich.de Ralf Gebel – PSTP 2007 – 10.-14.September 2007 Estimation of density and velocity The density was measured with a TOF mass spectrometer. Figure of merit = density / v² (magnet acceptance ~ 1/T)

22 Institute for Nuclear Physics (IKP)r.gebel@fz-juelich.de Ralf Gebel – PSTP 2007 – 10.-14.September 2007 Dissociator Development

23 Institute for Nuclear Physics (IKP)r.gebel@fz-juelich.de Ralf Gebel – PSTP 2007 – 10.-14.September 2007 Dissociator Development

24 Institute for Nuclear Physics (IKP)r.gebel@fz-juelich.de Ralf Gebel – PSTP 2007 – 10.-14.September 2007 Dissociator Development

25 Institute for Nuclear Physics (IKP)r.gebel@fz-juelich.de Ralf Gebel – PSTP 2007 – 10.-14.September 2007 Improved Density with new Design

26 Institute for Nuclear Physics (IKP)r.gebel@fz-juelich.de Ralf Gebel – PSTP 2007 – 10.-14.September 2007 Lambshift Polarimeter

27 Institute for Nuclear Physics (IKP)r.gebel@fz-juelich.de Ralf Gebel – PSTP 2007 – 10.-14.September 2007 Lambshift Polarimeter Ready for first beam!

28 Institute for Nuclear Physics (IKP)r.gebel@fz-juelich.de Ralf Gebel – PSTP 2007 – 10.-14.September 2007 Summary: Intensity record for deuterons unpolarized deuterons switching to polarized deuterons

29 Institute for Nuclear Physics (IKP)r.gebel@fz-juelich.de Ralf Gebel – PSTP 2007 – 10.-14.September 2007 Summary: Intensity and polarization Beam current at the source exitPolarization inside COSY Data from Exp. EDDA (pp – elastic scattering) P avg = (91.4  2.2 ) %

30 Institute for Nuclear Physics (IKP)r.gebel@fz-juelich.de Ralf Gebel – PSTP 2007 – 10.-14.September 2007 Outlook Beam for the Lambshift Polarimeter Improved atomic beam stage for COSY Operation Thank you! Acknowledgments: A.S. Belov (ABS, LSP...) R. Engels (LSP)

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