Refurbishment of the Electrostatic Accelerators of ithemba LABS

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1 Refurbishment of the Electrostatic Accelerators of ithemba LABS SNEAP 2012 INFN Legnaro, Italy, 1-5 October J.L. Conradie, G. Badenhorst, F. Balzun, A. Crombie, G. De Villiers, H. Delsink, C. Doyle, C. Ellis, D. Fourie, M. Hogan, I. Kohler, S. Marsh, R. McAlister, H. Mostert, O. Pekar, J. Pilcher, S. Mullins, P. Van Schalkwyk, K. Springhorn, ithemba LABS, P.O. Box 722, Somerset West 7130, South Africa

2

3 Polarized ion source Separated-Sector Cyclotron Facility SSC Target vaults Spectrometer SPC2 ECR ion source SPC1 electronics electronics Radioisotope production Proton therapy Neutron therapy beam swinger m 3 RuPAC-2012, Saint-Petersburg, RUSSIA, September

4 Control Room 6MV CN Van de Graaff 2003 ithemba LABS

5 BEAMLINES OF THE 6MV CN VAN DE GRAAFF ACCELERATOR AEROSOL BEAMLINE NEW OBJECTS SLITS POSITION OF THE 90 0 BENDING MAGNET SOLID-STATE BEAMLINE IMAGE SLITS FOR ENERGY SELECTION ADDITIONAL QUADRUPOLE MICRO-PROBE BEAMLINE MACRO-PIXE BEAMLINE NEUTRON BEAMLINE

6 Layout HV Terminal Ion Source Steerer 3 Steerer 2 Steerer 4 Gap Lens Einzel Lens 2

7 Beam Envelope Calculated with the Program IGUN

8 Beam Profile in the Van De Graaff - 2 MeV Protons kev p+ --> 10 kev --> 2 MeV Einzel1=4.705; Buncher=2.6; Acc=-4.715; Einzel2=4.651 kv 6 4 R (mm) mrad 4 mrad 8 mrad 12 mrad 16 mrad 20 mrad -2 mrad -4 mrad -8 mrad -12 mrad -16 mrad -20 mrad Z (mm)

9 24 Digital Meters Installed in the Terminal of the 6 MV CN Van De Graaff

10 Faraday Cup

11 Scanner

12 Oscilloscope Picture of the Beam Profile measured on a scanner

13 Scanner System for ithemba LABS

14 Measured Beam Profile on 3 Different Scanners

15 New Grid Electronics

16 1 of 7 Oil Diffusion Pumps that were Modified for Remote Control Operation

17 Display of the Vacuum System

18 Terminal Potential Stabilizer

19 Terminal Potential Stabilizer Control Page

20 Display of Different Signals of the TPS

21 Energy Measurement at the Van de Graaff

22 Safety Interlock System

23 EPICS Control Pages

24 Power Supplies and Electronics

25 Control Room 6MV CN Van de Graaff 2012

26 ithemba LABS Gauteng 6MV Tandem Accelerator Facility Layout AMS Control Room Data Acquisition Electronics Micro Probe 0 Degree PIXE Nuclear Structure Physics

27 Injection Beam Line before the Refurbishment

28 Accelerator Injection

29 Injection Side of the Tandem Accelerator after Refurbishments

30 Refurbishment of the 6 MV EN Tandem Accelerator

31 High Energy Beam Lines of Tandem

32

33 Layout of AMS system for ithemba LABS Gauteng

34 Injection System for 6 MV EN Tandem Accelerator of ithemba LABS

35 Injection Beam Optics from AMS Ion Source to middle of Tandem Bouncer acceleration gaps Q-snout einzel lenses 90 degree electrostatic analyser r =300 mm Energy/charge state ratio = 90 kev 90 degree bending magnet r = 600 mm Maximum mass energy product =15.6 MeV amu einzel lenses Acceleration tube

36 Einzellens focus beam at Snout acceleration gap Beam spot of radius 3.5 mm at entrance to stripper pipe

37 90 Degree Bending Magnet

38 AMS Injection Beam Line

39 AMS Injection Beam Line

40 300 micro A Carbon 12 13/12/2009

41 Layout of the High Energy AMS System

42 AMS ACTIVITIES ON THE HIGH ENERGY SIDE Rebuild existing high energy beam lines: Replace analyzer magnet with larger magnet (better mass*energy product) Replace magnetic elements with electrostatic devices AMS requirement Replace magnetic doublet after analyzer magnet with triplet arrangement Project to be completed by end of March 2013

43 Thank you

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