Partikel terapi accelerator (Siemens)

Transcription

1 Partikel terapi accelerator (Siemens) 1 Dose and intensity Range of Proton energy: Carbon energy: 30 cm (50-)250 MeV (100-)430 MeV/u=5GeV Dose of 2 Gy (=J/kg) in 2(10) l in 2 min. Particle intensity p in 2 min or C in 2 min

2 SIEMENS/DANFYSIK PT system 10m 3 Siemens facility in Marburg PT RKA Siemens: Also PT i Kiel and Shanghai

3 Kiel facility 5 Rhön-Klinikum Marburg 6

4 Rhön-Klinikum Marburg First accelerator installation in nov Building Layout 8

5 Main specs. to the PT accelerator system Proton energy range MeV/u Carbon ion energy range MeV/u Time to change between ion species <10 s Ramping time of synchrotron to highest magnetic field <1 s Extraction time from synchrotron <10 s (up to 30 s) Time for energy change (stop extraction to start extraction) <5 s Time to switch beam from room to room <8 s System uptime >95-98% Maximum number of protons at end of HEBT per spill Maximum number of carbon ions at end of HEBT per spill Intensity variation Stability during spill Extracted intensity (300 ms) sampling <+30%/-50% Max/min intensity for faster sampling (down to 10 µs) <3 Beam width at variations at isocenter <20% Position variations at isocenter (including feedback) <0.5 mm Integral intensity (fill) <30% Variations in mean energy from synchrotron <0.1% RKA i Marburg Linac Focusing Ion source quadrupole Radio Frequency Quadrupole Low-energy preaccelerator 10 m Deflection magnet 10

6 ECR Ion Source 11 12

7 Beam after ion source 13 LEBT Macro-pulse chopper 14

8 15 Solenoide 16

9 LINAC quadrupoles Ramped lenses with 5Hz 15ms ramp-up-time, 3ms flat-top, 25ms ramp-down-time 17 Radial Envelopes 5 radial envelopes x and y [mm] L L z[cm] beamaxis 18

10 MEBT debuncher Injection septum chopper Vertical correctors Stripper foil 19 MEBT Horizontal beam envelope [m] versus distance [m] Vertical beam envelope [m] versus distance [m] Betatron envelope Momentum envelope 20 Note: Linear optics

11 Chopper slit bend chop bend 21 Charge separation The most closely spaced ions, from a not complete stripping process, will be O 7+ and O

12 MEBT 25 dipole 23 Debuncher Beam at the stripper: After the debuncher: 24

13 RKA i Marburg 10 m Synchrotron cavity 2.5 kv, 1-7 MHz, Rev. freq MHz 25 Elektrostatisk DF synchrotron ekstraktions septum Magnetisk ekstraktio septa Bumper Elektrostatisk injektions 26

14 Synchrotron dipole 27 Synchrotron sextupole 28

15 Maximum field, Pre-prototype exit, y=0, 100% db0/b0 db/b0 Calculate db0/b0 (T) Non-linear EFB variation, Pre-prototype exit, y=0, 100% x (mm) dlres/lhalf dint_rel Calculated dlres/lhalf (T) x (mm) 29 Electrostatic injection septum 30

16 Electrostatic extraction Septum 31 Multi-Turn-Injection 32

17 Magnetic extraction septum 33 Extraction straight section 34

18 Synchrotron cycle 1,2 1 "chimney" B/Bmax 0,8 0,6 Extraction 1-10s low-energy protons high-energy protons low-energy carbon high-energy carbon 0,4 0,2 Injection db / dt / Bmax =1/s time (s) 35 Beam envelope at injection 36

19 Injection bump septum Bumper magnet #1 #2 #3 3.2 mrad. 6.3 mrad. 7.6 mrad. 37 Bumper supply Magnetic field 18 μs Turn 4 15 time 38

20 Synchrotron dump Vertical beam envelope [m] versus distance [m] Note: Linear optics Betatron envelope Momentum envelope Note: Linear optics 39 Slow Extraction 40

21 HEBT 41 HEBT HCPG2 HCVS4 HCHS4 HCHS3 HCPG1 HCVS2 HCHS2 HCVS1 HCHS1 HCPG3 HCHS5 HCVS5 HCPG4 H4PG2 H4VS2 H4HS2 H4VS1 H4HS1 H4HS3 H4VS3 H4PGT H1PGT H2PGT H3PGT Survey-Plot [mm]

22 Fast Beam Abort System 43 HEBT 44

23 HEBT quadrupole 45 RKA i Marburg 10 m TR-1 TR-2 TR-3 TR-4 46

24 Udfordringer ved et PT anlæg Kompleksitet Pålidelighed - QA Økonomi Logistik Billeder fra Marburg 48