First operational experiences with the SC cyclotron, degrader and beam lines at PSI s new proton therapy center
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1 First operational experiences with the SC cyclotron, degrader and beam lines at PSI s new proton therapy center Marco Schippers, Jürgen Duppich, Gudrun Goitein, Eugen Hug, Martin Jermann, Eros Pedroni, for the PROSCAN team (>50 persons) Marco Schippers, PTCOG Wanjie May 21-23,
2 PROSCAN: Stand-alone facility at PSI January-June 2007 Cyclotron Experiment OPTIS-2 Degrader Med. Pavillon Gantry-2 Energy selection Gantry-1 10 m Marco Schippers, PTCOG Wanjie May 21-23,
3 250 MeV SC-cyclotron Delivered by ACCEL an intensive collaboration Marco Schippers, PTCOG Wanjie May 21-23,
4 Acceptance tests and commissioning of cyclotron and beam lines Marco Schippers, PTCOG Wanjie May 21-23,
5 Levels of Quality Assurance of cyclotron Measurements for information & reference, not specified e.g.: field maps Acceptance of subsystems (factory acceptance by ACCEL) e.g.: coil-winding vacuum Acceptance tests (37) defined by PSI acceptance measurements e.g.: beam quality nr. of beam interruptions access to components / exchange time acceptance checks e.g.: documentation Marco Schippers, PTCOG Wanjie May 21-23,
6 Reliability: beam interruptions nr of interrupts unscheduled interrupts, automatic restart, 10 hour test Result: No beam during 3.0 minutes (spec: <6 min=1%), nr longer than 10 sec = 2 (spec: < 5) interrupt length (sec) Marco Schippers, PTCOG Wanjie May 21-23,
7 Beam on/off and stability Vertical deflector in cycl. Center -beam on/off Necessary for fast dynamic scanning (Gantry-2) Acceptance tests: repetition rate 1 khz beam off < 50 μsec intensity stability σ<5% (for Gantry-1 and München: ) Beam intensity On/off by means of Vertical deflector in center time (ms) 40 μs ms Marco Schippers, PTCOG Wanjie May 21-23,
8 Intensity stabilization: first results Intensity Arc current => emittance Beam from cold cathode source Intensity position Output fluctuations => Emittance fluctuations Arc current => intensity spread phase space selection by apertures σ=20% σ=40% Intensity position σ=6% proper phase space selection => intensity spread position Next step: -deal with high power in center of cyclotron Marco Schippers, PTCOG Wanjie May 21-23,
9 >80% extraction efficiency: Low dose to service staff 24 h after beam off, August 2006 (extr. beam int: 6 μa.h) : inside cyclotron on pole, closed cap: mid plane, open pole cap: degrader un/shielded: 230 μsv/h 88 μsv/h 235 / 10 μsv/h (no dramatic increase observed since) above unshielded degrader next to shielded degrader Marco Schippers, PTCOG Wanjie May 21-23,
10 Beam-energy adjustment Degrader unit Q Q Q Steerer Kicker dispersive focus; position E-error Carbon wedge degrader MeV 5 mm ΔRange in 50 ms Marco Schippers, PTCOG Wanjie May 21-23,
11 Energy scanning, Estep ~5 mm range in water. Current in Dipole Degrader Beam energy error 50 ms Marco Schippers, PTCOG Wanjie May 21-23,
12 Operation experience Marco Schippers, PTCOG Wanjie May 21-23,
13 Operation during patient treatment Marco Schippers, PTCOG Wanjie May 21-23,
14 Operation statistics first 10 weeks of patient treatment HF power, extracted beam, arc current of ion source. Machine Up when: HF on AND Ion source high Marco Schippers, PTCOG Wanjie May 21-23,
15 Analysis of Unsched. Down Time UDT per week: occurs as single events MTBF (UDT>0.5 h) weeks (typically at start up) Marco Schippers, PTCOG Wanjie May 21-23,
16 coming soon Marco Schippers, PTCOG Wanjie May 21-23,
17 Gantry-2: assembly started degr. magnet gantry structure Marco Schippers, PTCOG Wanjie May 21-23,
18 Beam switch yard: connect in June 2007 Marco Schippers, PTCOG Wanjie May 21-23,
19 Conclusions and Outlook: We are happy with performances of cyclotron and beam lines Last problems are being solved let s move on! June 2007: connection to Gantry-2, OPTIS-2 and Exp. Aug. 2007: restart patient treatment program at Gantry-1 start commissioning OPTIS-2 Patient treatments OPTIS-2: end 2007, Gantry-2: 2008 Thanks to: ACCEL crew & PSI staff Marco Schippers, PTCOG Wanjie May 21-23,
20 The End Marco Schippers, PTCOG Wanjie May 21-23,
21 Dose to service staff In cyclotron, closed cap January 2006: after 1h, 500 na extracted extracted beam integral: 1.6 μa.h 2:00 22:00 23:00 00:00 01:00 02:00 03:00 04:00 05:00 06:00 07:00 08:00 09:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00 20:00 21:00 22:00 23:00 00:00 01:00 02:00 03:00 04:00 05:00 06:00 07:00 08:00 09:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00 20:00 21:00 22:00 23:00 00:00 01:00 02:00 03:00 04:00 05:00 06:00 07:00 08:00 gamma Dose rate (usv/h) Unshielded degrader 1E Time after 500 na, 1 h (h) Zeit von ; ca. 21:00 Uhr bis ; 08:00 Uhr 1E4 1E3 1E Time after 500 na, 1 h (h) Marco Schippers, PTCOG Wanjie May 21-23,
22 Extraction efficiency I=100 % at R=30 cm Channel through yoke Routinely extracted beam = ~83% Marco Schippers, PTCOG Wanjie May 21-23,
23 Dual scattering system for OPTIS-2 Transmission = 0.5% at 70 MeV, dp/p=+/- 1% => Optimize scattering system Beam 1 st foil widens beam 2 nd foil flattens beam W Al Dual Ring: eff. = 36% Multiple Ring: eff. = 57% The Multiple Ring solution follows the ideas presented by Yoshihisa Takada (poster PTCOG43) Test foil made by laser ablation (Fachhochschule Windisch) Design model tested and confirmed at HMI Marco Schippers, PTCOG Wanjie May 21-23,
24 Milestones of PROSCAN project April 2001: Contract PSI-ACCEL, start detailed design Mar. 2004: Delivery cyclotron at PSI April 1, 2005: First beam extracted Dec. 2005: Routine beam, Start acceptance tests Mar. 2006: 33 out of 37 acceptance tests OK building reconstruction, connect Gantry-1 June 2006: restart of beam program; beam on Gantry-1 Sept. 2006: start of preparation for patient treatment Febr. 2007: start of patient treatment with Gantry-1 June 2007: building reconstruction, connect OPTIS-2, Gantry-2 Aug. 2007: restart of patient program, commissioning OPTIS-2 Marco Schippers, PTCOG Wanjie May 21-23,
25 Intensity control with deflector plate - Max intensity set by: Ion source + phase slits int. modulation Roles of deflector plate: - decrease drift of intensity - set requested intensity a slow feed back acting on the deflector plate Marco Schippers, PTCOG Wanjie May 21-23,
26 Dose to service staff 24 h after 500nA off, Jan (extr. beam int.: 1.6 μa.h) : on pole, closed cap: 450 μsv/h mid plane, open pole cap: 220 μsv/h degrader un/shielded: 465 / 17 μsv/h 24 h after beam off, August 2006 (extr. beam int: 6 μa.h) : on pole, closed cap: 230 μsv/h mid plane, open pole cap: 88 μsv/h degrader un/shielded: 235 / 10 μsv/h Marco Schippers, PTCOG Wanjie May 21-23,
27 Matching of extracted beam cyclo tron Emittance measurement Varying Quad method Phase space ellipse parameters at cyclotron exit (beam width) 2 Quad-strength Optimize setting of Quad triplet to focus at the degrader Marco Schippers, PTCOG Wanjie May 21-23,
28 Heating of coil by beam losses Calc. of power in coil per 100 na stopped : PSI (Atchison): W KVI (Beijers,Brandenburg): 0.3 W ACCEL/Framatom: 0.6 W Heater 270 na stopped He-pressure ( normal reserve cooling power ~2.5 W ) measured: P=0.38 (2) W per 100 na stopped Marco Schippers, PTCOG Wanjie May 21-23,
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