New beams from the SPIRAL 1 upgrade: status and perspectives

Transcription

1 SPIRAL 1 Upgrade New beams from the SPIRAL 1 upgrade: status and perspectives P. Delahaye for the Upgrade SPIRAL 1 team

2 SPIRAL upgrade in a nutshell Extending the number of elements produced by the ISOL method at SPIRAL 1+ ionisation: VADIS from ISOLDE 1+ beams from metallic elements with T fusion <2000 C Conversion from 1+ to n+: Phoenix booster Almost chemistry independant, charge breeding times from 10 to ~200ms

3 SPIRAL upgrade in a nutshell Extending the number of elements produced by the ISOL method at SPIRAL Feb workshop in preparation of the GANIL PAC meeting: 103 beams discussed 5 accepted proposals and 12 LoIs submitted in June 2016 Beams Spokesperson Requested I (pps) Energy Experiment n Target and Ion source / Primary beam 38mK G. De France 5.00E+05 9 AMeV E737 C + FEBIAD / 40Ca 17F G. Grinyer 1.00E+05 7 AMeV E750 C + FEBIAD / 20Ne 20-21O De Souza et al 2E4/1E4 2.7 AMeV E739 C + Nanogan / 22Ne + 26Mg 14O I. Stefan 3.00E AMeV E744 C + Nanogan / 16O 32Ar B. Fernandez Domin. 1.00E AMeV E751 C + Nanogan / 36Ar New FEBIAD source! (ISOLDE VADIS) LoIs Including AGATA, AGATA/MUGAST, ACTAR and LISE experiments

4 first experiments with the new beams from the SPIRAL 1 upgrade Preparation of 2 upcoming experiments with the new beams of the upgrade E737: Isospin mixing measurement in at SPIRAL 1 using 38 K alkaline beam G.de France, E.Clément, P.Van Isacker et al. Coulomb excitation of a Feasibility 38m K beam early for a 2018 direct is measurement under evaluation of the Isospin mixing angle in the A=38 multiplet Silicon detector 38 K m Isomeric beam 0 + (T 1/2 =924 ms) Pb Minimum intensity of pps at 9 MeV/A EXOGAM De France, Clément et al. ACTAR TPC Resonance region Beam E750 :Study of the 6.15 MeV resonance in 18 Ne decay for X-ray bursts and novae (T 9 > 0.1) G. Grinyer, T. Roger et al. Recoil proton 14 If O ACTAR + α is operational! 18 Ne* 17 F + p : possible CNO cycle breakout Test foreseen in November 17 F+p reaction in inverse kinematics 17 F /s (SPIRAL upgrade) Excitation functions for 17 F+p scattering over a broad range of 18 Ne resonances Direct observation of 2p and α decays

5 ISOLDE VADIS 1+ beams from metallic elements with T fusion <2000 C FEBIAD source - reminder Different tests at SIRA and SPIRAL 1 Coupling of the SPIRAL 1 targets with the VADIS Dilatation problems are fixed Ion source sliding against its axis oven attached to container Record temperature of 2400 C attained Dec. 2013: tests at nominal power at SPIRAL 1 P. Chauveau et al, NIM B 376(2016)35 O. Bajeat et al, NIM B 317(2013)411 Day 1 beams from FEBIAD TIS test results with 36 Ar@95AMeV at nominal power at SPIRAL 1 Already 7 new elements Na, Mg, Al, P, Cl, Cu, Fe + many more to come : reliability tests Failing BeO insulators exchanged High voltage discharges at extraction fixed More than 3 weeks running with stable efficiencies

6 h% FEBIAD source - status 70 2 ion target ion sources 1 in assembly 1 conditioned on the SPIRAL 1 test bench Ionisation efficiency measurements Energy profile measurement ? With Xe injection? MK5 ISOLDE VADIS ISOLDE VADIS GANIL MK5 ALTO IRENA ALTO Comptage He Ne Ar Kr Xe Rn Ref: L. Penescu et al, Rev. Sci. Instrum. 81, P. Chauveau et al, NIM B 376, S. Essabaa et al NIM A 317 Intensity increase to be confirmed on long term *Yield estimates use conservative efficiencies* A GANIL Using a calibrated leak with gas injection: h= I1+/Igaz Tension des grilles (V) Simulations: M. Herbane, LPC Caen Charge breeding efficiency depends on de

7 Phoenix ECR charge breeder Former ISOLDE ECR charge breeder Upgraded with new Al plasma chamber, UHV vacuum,2 RF ports and gas injection, injection triplet, mobile injection and puller electrodes 1 + With contributions from Tested at LPSC in summer 2015 High efficiencies with stable beams Rare gases and alkalis L. Maunoury et al, Rev Sci Instrum. 87(2016)02B508

8 Phoenix ECR charge breeder 2016 installation in the GANIL beam lines Injection C. B Qpoles Extraction Cabling, supplies, RF and slow control tests: first semester of 2017 Commissioning tests: Run 1 & 2 ( July) First tests of the charge breeder with stable alkali ions at SPIRAL Degraded conditions: No gas control No standalone DV power supply No motorisation of injection and puller electrodes Discharges limiting the injection triplet L. Maunoury et al, to be presented at the ICIS 2017 conference

9 Phoenix ECR charge breeder Noble gases Alkaline elements Close to efficiencies measured in 2015 at LPSC Possible optimizations with higher B field at injection, as shown with LPSC CB

10 November - December September October Charge breeder: Ongoing work - Triplet repair -done - Additional steerer installation DC14HO - done - DV power supply consolidation -ongoing - Motorization of injection/extraction electrodes - ongoing - Injection yoke replacement for higher B field - done - Plasma electrode repositioning - done - On-off measurement - ongoing - Cable shaft sealing - done - Nuclear ventilation adjustment -ongoing - Tape station and gas storage automats -ongoing -FEBIAD preparation * Efficiencies verification * Energy dispersion measurement - Pursuing charge breeding stable beam tests - End of civil engineering work First quarter of 2018 Annual maintenance Internal safety authorization for RIB production: Documentation

11 Charge breeder: run 3 10/25 th 12/04 th 23/10/ /10/ /10/ /10/ /10/ /10/ /10/ /10/ /10/ /11/2017 Test Ventilation Nucléaire Redémarrage de tout l'ensemble SP1 Optique 39 Na + / 39 Na n+ 02/11/2017 Optique 39 Na + / 39 Na n+ 03/11/ /11/ Kr 17+ CIME 05/11/2017 G. France T /11/ /11/ /11/2017 Optique 39 K + / 39 K n+ Shooting through 39 K + 09/11/ /11/ /11/ Kr 17+ CIME 12/11/2017 A. Dubois T /11/ /11/ /11/ /11/ /11/ /11/ /11/ /11/ /11/ /11/ /11/ /11/ /11/ /11/ /11/ /11/ /11/ /11/ /12/ /12/2017 Faisceau accéléré CIME K n+ Test dq/m Tests PhD Arun Test dq/m K n+ Test PhD Arun Test 7 Li 1+ / 7 Li n+ Test 85 Rb 1+ / 85 Rb n+ 03/12/2017 Test PhD Arun 04/12/2017 Fin des Tests Nuclear ventilation tests Beam optics verification With repaired triplet Reproducing exp. results with cosy infinity Test of acceleration in CIME Test of A/q change Mimicing a change from stable to radioactive beams Completing tests with other alkali elements Li and Rb Investigation of charge breeding time (A. Annaluru s PhD) on-off measurements

12 SPIRAL 2 week 11/2016 Overall schedule Presentation M. Dubois RIB second semester of 2017 Delays

13 Present situation GANISOL meeting 18/09/2017 Overall schedule Presentation M. Dubois Delayed civil engineering: Cable shafts sealing Delays Delayed technical integration: Slow control tests to be finished Starting commissioning on time, but Delayed commissioning tests: Failing plasma electrode RIB commissioning first run of 2018 for experiments thereafter

14 Radioactive ion beam commissioning A - Preparation of first experiments Direct isospin mixing measurement in Coulomb excitation of an 38m K isomeric beam from SPIRAL1, G.De France et al (E737) 38m K from 58 Ni fragmentation ok but not from transfer reaction with 36 Ar Population of the isomeric state depends on the reaction mechanism! Testing 38m K from 40 Ca fragmentation Resonant proton elastic scattering on 17F and 2-proton emission from excited states in 18Ne, G. F. Grinyer et al (E750) 17F was observed as BeF molecule with dissociating BeO insulator F atomic beams in principle well produced with FEBIAD sources Testing 17 F production from 20 Ne/ 40 Ca fragmentation 2018 run 1

15 Beyond commissioning From day 1 beams ISOLDE FEBIAD + Graphite targets To longer term: New targets: Fragmentation targets Nb target design is ongoing Others under study (SiC, Al2O3, CaO ) Fusion evaporation targets thin Ni target (PhD thesis V. Kuchi) + ion source developments Collaborations within EURISOL/Beamlab within ENSAR2

16 Organisation of the target and ion source R&D Different developments Testing production with new primary beam on C target New Target or new ion source Already exists To be tested To be improved and tested To be designed and tested Difficult Evaluation in Delay Number (Month) of TISS to to >2 GANISOL ISOL beams for GANIL GPI HR (supply, assembling, test) MM (PhD student) Ressources for 1 TISS Cost Design Quotation Safety evaluation reviews after each PAC meeting 25->50k 4 MM 1 MM 1 MM Direction + TISS developpers + 4 external physicists (T. Stora, M. Assié, B. Blank, N. Orr) List of priorities - from Review 2016/07 Test of new beams with C targets 1) 30P and 25Al from 40Ca fragmentation 2) 56Ni, 48Cr from fragmentation of 58Ni. For 56Ni: 56Co contamination to evaluate. 3) Beams (79Se, 60Fe, 67As) from 86Kr fragmentation. Development of new targets All science driven (LoIs) 1) Nb for production of high intensities for beams with 30<Z<40 1) ex aequo Fusion evaporation targets (N=Z nuclei)

17 Radioactive ion beam commissioning C- First experiments - E737 ( 38m K) or E750 ( 17 F) A - Preparation of first experiments Direct isospin mixing measurement in Coulomb excitation of an 38m K isomeric beam from SPIRAL1, G.De France et al (E737) 38m K from 58 Ni fragmentation ok but not from transfer reaction with 36 Ar Population of the isomeric state depends on the reaction mechanism! Testing 38m K from 40 Ca fragmentation Resonant proton elastic scattering on 17F and 2-proton emission from excited states in 18Ne, G. F. Grinyer et al (E750) 17F was observed as BeF molecule with dissociating BeO insulator F atomic beams in principle well produced with FEBIAD sources Testing 17 F production from 20 Ne/ 40 Ca fragmentation B- Yield checks for future experiments - Priorities from GANISOL review 2016/7/4 From 40 Ca fragmentation: test of of production of 25 Al and 30 P (LoI De Séréville et al) 2018 run run 1 If possible test of production of 56 Ni from the fragmentation of 58 Ni (LoI Assié et al) test of production of isotopes heavier than A> 50 from the fragmentation of 86 Kr(LoI Beaumel et al, LoI Mengoni et al, LoI De Angelis et al) 2018 or 2019

18 Fragmentation targets List of priorities from the GANISOL review 2016, July 4 th Ongoing developments To be tested at SPIRAL at the earliest in 2019 A Nb target development A>60 isotopes such as 67 As, 72 Kr, 74 Rb, 79 Se Feasibility test 2018 First online test earliest in 2019 Stack of folded Nb foils Test in 2018: target heating in furnace - up to 2000 C Behavior of Nb foils stack at high temperature Adaptation of foil thickness and stacking procedure according to results Most pieces received for the tests Online version: cooled catcher for the power dissipation of the Bragg peak Primary beam: 12C at 95MeV/u

19 Fusion evaporation targets List of priorities from the GANISOL review 2016, July 4 th Ongoing developments To be tested at SPIRAL at the earliest in 2020 B Fusion evaporation target ion source development neutron deficient isotopes such as 74 Rb, 114 Cs, N=Z for DESIR Offline test Ionisation efficiency and rapidity measurement Online test at ALTO earliest 2019 Online test at SPIRAL earliest ECS fusion evaporation V. Kuchi, P. Jardin Collaboration with IPN Orsay first test possible in 2019 with the Tandem

20 Perspectives New targets New acceleration schemes Started, ongoing developments CIME upgrade for astrophysics EBIS charge breeder for higher energies Evaluation is required

21 Perspectives New targets New acceleration schemes CIME upgrade for astrophysics EBIS charge breeder for higher energies

22 (From F. Chautard internal report) Lower energy beams with CIME Astrophysical reactions Novae X-ray bursts CIME working Diagram no beam no data Budget SPIRAL1 estimated today to 20k 15 1 O year 1.2 MeV/u postdoc ~1 year work The limit is 1.75 MeV/u To maintain V source well above 10 kv (beam quality request) and to minimize the extraction energy W (physics request), one has to increase the injection radius R injec of the cyclotron for a fixed extraction radius. The design of a new inflector is necessary. Not a project: Evaluation is required

23 Perspectives New targets New acceleration schemes CIME upgrade for astrophysics EBIS charge breeder for higher energies

24 EBIS/T charge breeder principle E. D. Donets, V. I. Ilyushchenko and V. A. Alpert, JINR-P7-4124, 1968 E. D. Donets, Rev. Sci. Budget Instrum. estimated 69(1998)614to ~2M ~4/5 years project Investigation to be consolidated depending on interest! REX-EBIS Not a project: Evaluation is required TITAN EBIT J e ~10 4 A/cm 2 I e =5A SPIRAL 1: E~20 AMeV possible for most beams SPIRAL 2 Phase 2: AMeV possible

25 Conclusion SPIRAL 1 upgrade status The FEBIAD source has been thoroughly tested and is ready for on-line operation >3 weeks operation has been proven possible Stable efficiencies, some improvements possible (?) The SPIRAL 1 charge breeder has been installed in the beam lines and confirm performances shown in LPSC Efficiencies and charge breeding times are ok Optimized magnetic configuration may give higher efficiencies Ongoing work for reliable operation of slow control, beam optics Should be completed by Feb Documentation for internal safety authorization is being prepared Should be completed by Feb The RIB commissioning is planned in beginning of run 1 17 F and 38m K production test for accepted experiments First experiments in the course of 2018 depends on the availability of experimental setups

26 Conclusion Ongoing R&D for new beams Priorities of R&D within GANISOL reviews after every PAC meeting Beams from C target + FEBIAD Production tests of 25 Al, 30 P, possibly 56 Ni during the RIB commissioning Production tests of A> 50 beams from the fragmentation of 86 Kr to be scheduled New targets Nb targets for the production of high intensities for 30<A<40 First on-line tests at earliest 2019 Fusion evaporation targets (N=Z / neutron deficient isotopes) Program in collaboration with ALTO, first on-line test at SPIRAL earliest 2020 Perspectives Further Target ion sources developments for new beams (LoIs) Not evaluated: extending the acceleration capabilities Towards lower energies (E<=1AMeV): CIME inflector modifications Towards higher energies (E>15 AMeV): EBIS charge breeding

27 GANISOL ISOL beams for GANIL SPIRAL upgrade team O. Bajeat M. Babo P. Chauveau (now CSNSM) C. Couratin (now IKS leuven) M. Dubois (chef de projet) P. Delahaye (resp. scientifique) M. Fadil R. Frigot S. Hormigos P. Jardin P. Lecomte N. Lecesne L. Maunoury B. Osmond V. Toivanen (postdoc) E. Traykov (now IPHC) J. C. Thomas T. Stora C. Seiffert F. Wenander L. Penescu E. Lienard G. Ban X. Fléchard D. Durand J. Angot T. Lamy R. Vondrasek Acknowledgements to

28

29 UCx in SPIRAL 1 Backup slides

30 Comparison of scenarios SPIRAL 2 phase 2 : 40 MeV deuterons on a graphite converter density (g/cm3) Power on converter (kw) Nb of fissions/s Day 1 target Nominal target UCx at SPIRAL 2H at 2H at 3He at 12C at 95 Primary beam 40AMeV 95AMeV 95AMeV AMeV range (cm) Nb of fissions/s for 1kW 1.40E E E E+10 Nb of pps for 1kW 7.8E E E E+12 In target yield calculations: MCNPx : ISABEL + CEM + ABLA See M. Fadil s poster

31 Timeline, budget gross estimates Decree modification for The UCx targets The acceleration of light beams < 12 C with intensities > pps 6 to 7 years Modification of the infrastructure 10 M UCx targets handling, light beam acceleration Project contracting assistance: 2.4M Target Ion Source Systems (TISS) and RILIS 3M System of isobaric separation 2M Provisioning a new cavity for the CSS 3M Risks 2M 16 FTEs 1.2 M 22.6 M Year T0 T0+1 T0+2 T0+3 T0+4 T0+5 Study (M ) 1,3 Investment (M ) Human resources (M ) 0, ,9 0,5 0,25 0,125 0,125 0,125 0,075

32 Thanks a lot for your attention! WG2 participants Bertram Blank CENBG convener François De Oliveira GANIL Pierre Delahaye GANIL convener Mickaël Dubois GANIL Manssour Fadil GANIL Fanny Farget GANIL Hanna Franberg GANIL Georgi Georgiev CSNSM Orsay Fadi Ibrahim IPN Orsay Pascal Jardin GANIL Nathalie Lecesne GANIL Xavier Ledoux GANIL Marek Lewitowicz GANIL Bertrand Rannou GANIL Berta Rubio IFIC (CSIC, Valencia) Hervé Savajols GANIL Alain Savalle GANIL Franck Varenne GANIL David Verney IPN Orsay

33 EBIS beam debuncher Linear RFQ under UHV CW EBIS concept RF for radial confinement (400V, 2MHz) DC potentials on the segments for longitunal space phase manipulation (a few 100V) Ongoing R&D within

34 E744 Search for -transition in the unbound 15 F I. Stefan, V. Girard Alcindor, F. de Oliveira et al. 14 O(p,p) 14 O We observed a narrow resonance in 15 F De Grancey, F., Mercenne, A.. et al PLB, 758, (2016) A ½- state located above the Coulomb barrier and just above the 2p emission threshold. A new experiment accepted at GANIL/SPIRAL1 Search for -transition in this unbound nucleus. We propose to measure 14 O(p, ) 15 F(p) 14 O SPIRAL1 beam 14 O >10 5 AMeV LISE2017 experimental setup (MUST2+EXL) (E1) Motivations: Conflicting theoretical predictions (p, ) ~ 1 mb?? Astrophysical application Study of 2 proton emission mechanism Structure of 15 F