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TEST OF A 3 GHz HIGH-GRADIENT ACCELERATING CAVITY

TEST OF A 3 GHz HIGH-GRADIENT ACCELERATING CAVITY. U. Amaldi , R. Bonomi , A Degiovanni , M. Garlasché , A. Garonna , I. Mondino , P. Pearce, P.L. Riboni , V. Rizzoglio and S. Verdù Andrès. General Concept of a Cyclinac. RF generators. gantry.

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TEST OF A 3 GHz HIGH-GRADIENT ACCELERATING CAVITY

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  1. TEST OF A 3 GHz HIGH-GRADIENT ACCELERATING CAVITY U. Amaldi, R. Bonomi, A Degiovanni, M. Garlasché, A. Garonna, I. Mondino, P. Pearce, P.L. Riboni, V. Rizzoglio and S. VerdùAndrès CTF3 Committee - UA - 24.3.11

  2. General Concept of a Cyclinac RF generators gantry fast-cycling beam for tumour multi-painting IBA linac Units computer controlled source (synchro)cyclotron chopped beam at 100-400 Hz beams used for other medical purposes The energy can be varied in 2-3 ms in the full range by changing the power pulses sent to the 16-22 accelerating modules (forming 8-11 RF Units) CTF3 Committee - UA - 24.3.11

  3. General Concept of a Cyclinac source LINAC CTF3 Committee - UA - 24.3.11

  4. Cyclinacs 30 MeV cyclotron 1993:first Cyclinac proposal CTF3 Committee - UA - 24.3.11

  5. Cyclinacs 30 MeV cyclotron 1993:first Cyclinac proposal 2001: IDRA-design CTF3 Committee - UA - 24.3.11

  6. Cyclinacs 30 MeV cyclotron 1993:first Cyclinac proposal 2001: IDRA-design 2003: test of LIBO-62 MeV (M. Weiss - TERA-CERN-INFN) CTF3 Committee - UA - 24.3.11

  7. Cyclinacs 30 MeV cyclotron 1993:first Cyclinac proposal 2001: IDRA-design 2007: firstCABOTO design 2003: test of LIBO-62 MeV (M. Weiss - TERA-CERN-INFN)

  8. Cyclinacs 30 MeV cyclotron 1993:first Cyclinac proposal 2001: IDRA-design 2007: firstCABOTO design 2003: test of LIBO-62 MeV (M. Weiss - TERA-CERN-INFN) 2008: Pediatric IDRA for Biella

  9. Cyclinacs 30 MeV cyclotron 1993:first Cyclinac proposal 2001: IDRA-design 2007: firstCABOTO design 2003: test of LIBO-62 MeV (M. Weiss - TERA-CERN-INFN) 2010: First Unit of LIGHT ADAM=Application of Detectors and Accelerators to Medicine 2008: Pediatric IDRA for Biella

  10. Cyclinacs 30 MeV cyclotron 1993:first Cyclinac proposal 2001: IDRA-design 2007: firstCABOTO design 2003: test of LIBO-62 MeV (M. Weiss - TERA-CERN-INFN) 2009: First Unit of LIGHT ADAM=Application of Detectors and Accelerators to Medicine 2008: Pediatric IDRA for Biella 2010 TULIP + CABOTO

  11. The last design of a cyclinac for carbon ions: CABOTO-C 150 MeV/u 150-400 MeV/u 400 MeV/u CABOTO – C = CArbon BOoster for Therapy in Oncology CTF3 Committee - UA - 24.3.11

  12. Dimensional comparison among carbon ion accelerators CTF3 Committee - UA - 24.3.11

  13. TULIP = TUrning LInac for Proton therapy 35 MeV cyclotron 3 or 5.7 GHz linac CTF3 Committee - UA - 24.3.11

  14. SW CellCoupledLinac for β= 0.25-0.60 74 MeV LIBO and LIGHT at 3 GHz: gradient E ≤ 20 MV/m Surface field Es ≤ 90 MV/m (Kilpatrick ≤ 2) 4 MW at 3 GHz Proton trajectory 62 MeV 15-20 MV/m LIBO CTF3 Committee - UA - 24.3.11

  15. SW CellCoupledLinac for β= 0.25-0.60 74 MeV LIBO and LIGHT at 3 GHz: gradient E ≤ 20 MV/m Surface field Es ≤ 90 MV/m (Kilpatrick ≤ 2) 4 MW at 3 GHz Proton trajectory 62 MeV 15-20 MV/m For CABOTO and TULIP: E ≤ 35-40 MV/m At 3 GHz or higher LIBO CTF3 Committee - UA - 24.3.11

  16. SW CellCoupledLinac for β= 0.25-0.60 74 MeV LIBO and LIGHT at 3 GHz: gradient E ≤ 20 MV/m Surface field Es ≤ 90 MV/m (Kilpatrick ≤ 2) 4 MW at 3 GHz Proton trajectory 62 MeV 15-20 MV/m For CABOTO and TULIP: E ≤ 35-40 MV/m At 3 GHz or higher LIBO Es / E ≤ 4.5 - 5 Problem: ‘the Nose’ CTF3 Committee - UA - 24.3.11

  17. SW CellCoupledLinac for β= 0.25-0.60 74 MeV LIBO and LIGHT at 3 GHz: gradient E ≤ 20 MV/m Surface field Es ≤ 90 MV/m (Kilpatrick ≤ 2) 4 MW at 3 GHz Proton trajectory 62 MeV 15-20 MV/m As far as Es is concerned: TERA’s 40 MV/m are equivalent to CLIC’s 100 MV/m For CABOTO and TULIP: E ≤ 35-40 MV/m At 3 GHz or higher LIBO Es / E ≤ 4.5 - 5 Problem: ‘the Nose’ ‘Nose’

  18. SW CellCoupledLinac for β= 0.25-0.60 74 MeV LIBO and LIGHT at 3 GHz: gradient E ≤ 20 MV/m Surface field Es ≤ 90 MV/m (Kilpatrick ≤ 2) 4 MW at 3 GHz Proton trajectory 62 MeV 15-20 MV/m BDR for TERA: Linac is 15 m long and a treatment is (20x100 Hz x120s) pulses BDR ≤ 3 10-7 For CABOTO and TULIP: E ≤ 35-40 MV/m At 3 GHz or higher LIBO Es / E ≤ 4.5 - 5 Problem: ‘the Nose’ CTF3 Committee - UA - 24.3.11

  19. SW CellCoupledLinac for β= 0.25-0.60 74 MeV LIBO and LIGHT at 3 GHz: gradient E ≤ 20 MV/m Surface field Es ≤ 90 MV/m (Kilpatrick ≤ 2) 4 MW at 3 GHz Proton trajectory 62 MeV 15-20 MV/m TERA is facing the same challenges as CLIC BUT cannot go to freguencies larger than 6 GHz: tranverse acceptance, distributed sources For CABOTO and TULIP: E ≤ 35-40 MV/m At 3 GHz or higher LIBO Es / E ≤ 4.5 - 5 Problem: ‘the Nose’ CTF3 Committee - UA - 24.3.11

  20. Since 2009 TERA has started an high gradient test Program Prototype test structures: • 3 GHz single-cell cavity • 5.7 GHz single-cell cavity • multi-cell structure CTF3 Committee - UA - 24.3.11

  21. 3 GHz Test Cavitygenerallayout • Single accelerating cell • H-coupled to WR284 waveguide • Cooling system (two plates, in-out pipes) CTF3 Committee - UA - 24.3.11

  22. Preliminaryhigh power test short position Low Power Measurments (Jan 2010) High Power Test (@CTF3 – Feb 2010) 1 µs 3 µs BD event Preliminary results compared with literature data [A. Grudiev et al, Phys. Rev. ST Accel. Beam 12 (2009)] S. Verdú Andrés et al. (2010) LINAC10 Proceedings Indirect measurments of field through Faraday Cup CTF3 Committee - UA - 24.3.11

  23. High power test: first results after few nights and no conditioning 150 – 170 MV/m acceptable range x = 30 (otherexpriments) x= 6 TERA @ 3 GHz CTF3 Committee - UA - 24.3.11 23

  24. Microscopy surface Inspection Microscope’s inside view on nose region: several craters and sparse activity can be observed. Difficulties in reconstructing the actual position of the craters. Final conclusion will come after cutting and opening the cavity. 0.5 mm CTF3 Committee - UA - 24.3.11 1 mm

  25. To complete the measurement we request 4 weeks for mounting, conditioning and testing this cavity CTF3 Committee - UA - 24.3.11

  26. The pieces of the 5.7 GHz test cavity are inhouse Low power tuning in 10 days To be tested after the 3 Ghz cavity in Frascati (L. Picardi) (with ADAM’s magnetron) CTF3 Committee - UA - 24.3.11

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