A CYCLOTRON TEST SITE FOR NEUTRINO EXPERIMENTS
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1 A CYCLOTRON TEST SITE FOR NEUTRINO EXPERIMENTS AND RADIOISOTOPE PRODUCTION Luciano Calabretta, A. Calanna, L. Cosentino, D. Campo, L.AC. Piazza, J. Alonso, W. Barletta,J. Conrad, M. Shaevitz SIF, Trieste Settembre
2 Main Goal: Construction of a cyclotron accelerators able to deliver 10 ma of proton beam Decay At rest Experiment for DAEδALUS: A Path to Measuring δ CP Using Decay-at-Rest Neutrino Sources, by J. Conrad & M. Shaevitz CP-violation in the neutrino sector δ cp studies At the Laboratory for Short baseline n μ matter effect n e experiment with no Underground Science novel design which provides highstatistics and low backgrounds SIF, Trieste Settembre
3 Shape driven by nature! Only the normalization varies from beam to beam is absent in the flux: look for its appearance! SIF, Trieste Settembre
4 SIF, Trieste Settembre
5 The duty factor is flexible, but beam-off is needed. SIF, Trieste Settembre
6 Cyclotrons: Viable technology? PSI is current world power leader in this energy range ~ 1.4 MW average, 590 MeV protons Extrapolation to higher power? Problems: 1. space-charge at injection 2. Clean extraction max loss 200 W (~10-4 ) Injector cyclotron Ring Superconducting cyclotron 800 MeV/amu 60 MeV/amu SIF, Trieste Settembre
7 Proposed Solution: H 2 + ions Two protons for every ion (1 ema = 2 pma) Perveance of 5 ema H 2 + at 35 kev/amu same as 2 ema of 30 kev protons Axial injection of 2 ema protons at 30 kev is well within state of the art Extraction with stripping foil Clean turn separation is not needed, only high-acceptance extraction channel SIF, Trieste Settembre
8 DAEdALUS Superconducting Ring Cyclotron has been investigated and Main technical problems sett! Coils and cryostat by J. Minervini (MIT), Stripper foil H. Okuno (Riken), Space Charge A. Adelman (PSI), Injection F. Meot (BNL) Injector cyclotron Stripper foil Ring Superconducting cyclotron Electrostatic deflector 120 kw SIF, Trieste Settembre
9 IsoDAR (Isotope Decay At Rest) Proton beam into neutron-producing target Secondary neutrons into ~50 kg pure 7 Li blanket 8 _ Li decay produces n e, high beta endpoint energy Good for discriminating background As with DAEdALUS, use IBD in liquid scintillator Good spatial, energy resolution GOAL: SEARCH STERILE NEUTRINO SIF, Trieste Settembre
10 Injector Cyclotron, normal conducting coils 60 MeV/amu, peak current 5 ma H 2 + Axial injection by spiral inflector Extraction by Electrostatic Deflectors ISODAR NEEDS CW BEAM POWER 600 KW! arxiv: SIF, Trieste Settembre
11 Beam dynamic simulations made by A. Adelman and J.Yang at PSI, by OPAL code including space charge effects cyclotron magnetic field map supplied by Catania Team 1 MeV/n 61.7 MeV/n Vertical beam size vs. turns number for different beam current SIF, Trieste Settembre
12 Beam dynamic simulations made by A. Adelman and J-Yang at PSI, by OPAL code including space charge effects cyclotron magnetic field map supplied by Catania Team Radial particle distributions (last 4 turns) SIF, Trieste Settembre
13 Stripper to remove the halo beam on the septum Deflector septum 0.5 mm thick Extraction efficiency 99.98%, if beam power is 600 kw on the septum 120 W! SIF, Trieste Settembre
14 Injection test at Best Cyclotron Inc. site in Vancouver CAPEN Experiment supported by Commissione 5 INFN Mini Cyclotron Solenoid Quads slits, emittance meter, buncher Gate Valve VIS on HV Platform Solenoid Vacuum Pumps Ion source VIS supplied by LNS-INFN SIF, Trieste Settembre
15 Central region and Spiral inflector designed by Catania Team liner dee #2 housing liner liner spiral inflector dee #1 TS - magnet beam injection in the median plane liner SIF, Trieste Settembre
16 The Vancouver set-up has not the same central region of IsoDAR and Daedalus injectorcyclotron Construction of a IsoDAR prototype cyclotron is convenient! Central field 1.07 T E= 7 MeV/amu Rex=0.7 m SIF, Trieste Settembre
17 20 cm 67 cm TEST SITE FOR HIGH POWER CYCLOTRON BYPRODUCT A POWERFUL RADIOISOTOPE GENERATOR Correction Coil Yoke This is a dual Cyclotron able to accelerate H - and ions with q/a=0.5 H 2 + and He ++ F 26 cm moving iron Pole Skirt Valley Main Coil Yoke 20 cm Proton beam is extracted by stripper at 28 MeV H 2+,D +, He ++ are extracted by Electrostatic deflector at 7 MeV/amu SIF, Trieste Settembre
18 Cyclotron parameters R axial hole 29 mm R pole 800 mm N. Sectors 4 Hill width Valley gap 1400 [mm] Pole gap 60 [mm] Diameter 2800 [mm] Full height 1800 [mm] Total weight 52 [tons] Vacuum 10-5 Pa Cavities λ/2 Double gap Acc. Voltage 70 [kv] Main Coil 200x240 [mm 2 ] 2 nd Coil size 30x240 [mm 2 ] size Parameters for ions with q/a=0.5, H + 2, He ++ E inj 70 [kev] E max 7 [MeV/amu] B [T] Bmax 1.90 [T] RF Harmonic 4th Freq [MHz] Main coil curr. density 2.8 [A/mm 2 ] 2 nd coil curr. density -1.1 [A/mm 2 ] Parameters for proton beam E inj [kev] E max 28 [MeV] B [T] Bmax 2.0 [T] RF Harmonic 2 nd Freq [MHz] Cur. density Main coil 2.3 [A/mm 2 ] Cur. density 2 nd coil 4 [A/mm 2 ] SIF, Trieste Settembre
19 Average field [T] dw/w 0 0, ,004-0,008-0,012 Protons H 2+, He R [cm] Isochronism plot SIF, Trieste Settembre
20 f Acceleration phase Protons H2+, He R [cm] SIF, Trieste Settembre
21 [cm] Beam Envelope along the extraction channel 3 2 E. Deflector M1 M radial envelope Axial envelope Large normalised emittance 6.5 p mm.mrad [q ] SIF, Trieste Settembre
22 Yoke Extracted Beam ED Cyclotron view with extraction trajectory for H2+ and He++ Stripper extraction (proton beam) is not yet studied Layout of vacuum chamber with holes for vacuum pumps, RF tuning and trimmer capacitors, diagnostic probes SIF, Trieste Settembre
23 2600 mm 1400 mm 288 mm Stem Diameter 80 mm 764 mm SIF, Trieste Settembre
24 Holes for the RF Cavities Extracted Beam Central Hole for axial injection On the other side For installation at LNS the vertical position is selected, but for commercial use the horizontal installation is the favorite SIF, Trieste Settembre
25 The central region will be optimised for injection and acceleration of ma beam current of H 2 + and He ++. Unfortunately not fit for H - injection! A solution for a dual operation is to use a central region optimised for H - and usable also for injection of He ++, but this solution allow accelerating low beam current for He ++ ( microa) The fast switch from a beam to the other, few hours, has to be optimised Red curve 2 nd harmonic proton, green curve 4 th harmonic D, He Kleeven, Nantes Cyclotron Switch from H- to He++, and delivering the highest beam current is feasible opening the cyclotron and replacing the central region, expected time for this operation less than one day SIF, Trieste Settembre
26 Liner Dee Liner Dee Dee Beam from SI Backintegrate d orbit Liner Dee Liner SIF, Trieste Settembre
27 Our Goal is to accelerate an H2+ beam with a current of 5 ma To achieve this goal we use our present existing Versatile Ion Source with some upgrading to deliver a beam current of about 50 ma A new injection beam line, including a RF buncher have to be build MIT supply the fund to build the new beam line The cyclotron is designed by INFN but will be built by BEST Cyclotron Inc. System, agreements are in progress SIF, Trieste Settembre
28 Beam current in the territory of 1-2 ma of proton beam are accelerated by commercial cyclotrons (2.1 p mm.mrad nor.) The use of H2+ beam and an higher injection energy should allow to increase this beam current (<1 p mm.mrad nor.) Expected bottle neck are the Buncher efficiency, electrostatic Spiral Inflector and central region acceptance Preliminary injection tests are in progress at Best Lab Study of a new generation of magnetic Spiral Inflector using Permanent magnet is in progress Injection of H- beam current in excess of 1 ma and acceleration up to 28 MeV is an additional commercial goal SIF, Trieste Settembre
29 How we can use this cyclotron, after our research activities? The cyclotron will be able to supply Proton beam 1 28 MeV and/or Deuteron 14 MeV, Helium MeV current intensity depends from the central region and from the ion sources Straightforward application is radioisotope production Physics Department of Catania University is interested to develop a laboratory for radioisotope purification SIF, Trieste Settembre
30 SIF, Trieste Settembre
31 Direct Production of Tc99m SIF, Trieste Settembre
32 Physical distillation In mini hot cell. Automate Separation of Mo and Tc specific activity SIF, Trieste Settembre
33 The separation of the Mo 100 target material and the Tc 99m is first accomplished by a dry distillation process as shown below. The irradiated target is transported to the processing unit The process steps correspond to converting the target material and radioisotope to their oxides, subliming the oxides and differentially distilling the oxides on different columns in the separation unit. The resulting Tc 99m oxide is then further purified in small columns for the final Tc 99m radiochemical. SIF, Trieste Settembre
34 IS POSSIBLE SATISFIES THE NEEDS OF ITALY WITH JUST 6 DEDICATED CYCLOTRONS LIKE OUR OR ALSO USING EXISTING COMMERCIAL CYCLOTRONS, BUT DISTRIBUTION MUST BE DAILY BASED FOR 99TC WHILE THE PRESENT 99 MO DISTRIBUTION IS WEEKLY BASED ADDITIONAL COSTS AND A LOT OF RADIOACTIVITY MATERIAL HAS TO BE TRANSPORTED THROUGH THE COUNTRY 99TC IS A NEW DRUG! YOU NEED NEW PERMISSION SIF, Trieste Settembre
35 cross section in mb yield in mci/uahr Could a high current alpha accelerator be useful? Zr96 (a,n)mo99 mo 99 from zr ,07 0, ,05 0,04 0,03 0,02 0, energy (MeV) energy (MeV) A 1 ma of He beam can produce a dose of 80 Ci/week Hospital generators needs a recharge of Ci/week We could supply generators per week SIF, Trieste Settembre
36 SIF, Trieste Settembre
37 A further interesting reaction is Bi 209 (alpha, 2n) At 211 At 211 decay scheme SIF, Trieste Settembre
38 210 At contaminant beta decay to 210 Po. T 1/2 138 days Energy range limited below 30 MeV to avoid this problem At 211 At 210 SIF, Trieste Settembre
39 Thanks for your attention! SIF, Trieste Settembre
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