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Solid state laser system for the SPES RIB project (classic and novel approaches )

Solid state laser system for the SPES RIB project (classic and novel approaches ) Daniele Scarpa INFN-LNL. Overview. Introduction The SPES layout & devices TIS R&D activities Laser R&D activities Final remarks. . SPES Infra-structures Phases . Phase b

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Solid state laser system for the SPES RIB project (classic and novel approaches )

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  1. Solid state laser system for the SPES RIB project (classic and novelapproaches) Daniele Scarpa INFN-LNL

  2. Overview • Introduction • The SPES layout & devices • TIS R&D activities • Laser R&D activities • Final remarks.

  3. SPES Infra-structures Phases Phase b Beam Selection & Post Acceleration Phase a Cyc & ISOL Facility Phase g d Applications Facility 50 x 50 m2 Level 0 25 x 50 m2 Level -1 Artistic View of the facility

  4. The SPES maindevices Driver: Post Accelerator: Production Target: ‘Commercial’ cyclotron Piave- Alpi existing complex NEW CONCEPT (Multi-foil UCx target) ALPI RIB manipulation stage • Mass Separator (WF) • Beam Couler • HRMS • Charge Breeder • RFQ • Target-Ion Source Complex: • optimized for 8kW beam power • - Eproton = 40 MeV for RIB • 1013 fission/s. PIAVE

  5. The TIS R&D activities

  6. The TIS SPES Laboratories HT LNL Lab Test Bench LNL Lab UCx Chemistry PADOVA Lab Carbide Chemistry LNL Lab New ‘class A’ LNL Lab Laser PAVIA Lab

  7. The SPES off-line Front end 40 kV platform

  8. RIB ionization methods: 1 2 H He 3 4 5 6 7 8 9 10 Li Be B C N O F Ne 11 12 13 14 15 16 17 18 Na Mg Al Si P S Cl Ar 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe 55 56 57 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 Cs Ba La Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn 87 88 89 104 105 106 107 108 109 110 111 112 Fr Ra Ac Rf Db Sg Bh Hs Mt Selective method Not extracted Surface Ion source Surface Ionization Method Very selective method Laser beam Photo Ionization Method Plasma Ionization Method Laser with SIS nonselective method Main fission (p-> 238U) fragments Plasma Ion source

  9. Target and Ion Sources > The Surface Ion Source (SIS) adopted for the SPES facility Hot cavity: - Optimized for Surface Ionization (Re inner surface) - Optimized for Laser Ionization (Ta, naked)

  10. Target and Ion Sources > The Plasma Ion Source (PIS) adopted for the SPES facility Starting configuration Hybrid MK5 (CERN) – EBPIS (ORNL)

  11. SPES ROAD MAP Commissioning2015:Delivery of infrastructure2015-2016Commissioningof subsystem 2) Operational-> 2017 : 40 MeVCyclotron - 2017  I = 5   μA, UCx  (13 mm) ; (SIS) : Rbe Cs- 2018  I= 50 μ A, SiC(40 mm full scale); (PIS-LIS): Al- 2019  I= 150 μ A,UCx(40 mm full scale); (LIS): Sn

  12. Pavia Dye Laser Laboratory λ λ Aluminum laser ionization Two step, one color ionization path: Al [308.216;308.216 e−] Al+ Second step: Non – resonant towards continuum same wavelength λ =308,216 nm Typical transition linewidth First step: Resonant λ =308,216 nm

  13. Pavia Dye Laser Laboratory 5900 A 5970 A 5888 A 2010: Neodimiumlaser ionization Threestep, twocolor ionization path: fast signal (first wavelength fixed @ 588,806 nm)

  14. Pavia Dye Laser Laboratory 2012: Combination of laser beam For off-line facilities or where typical laser system – hot cavity distance is ≈ 1-5 m a possible solution: Fiber optics Each laser enters in 200 um core fiber SMA-SMA connection: 3 x 200 uminto 1 x 600 um + Optical fiber 3 in 1: optimal spatial overlap Easy final alignment Up to 1mJ in each 200um. fiber (pulse 15 ns.) Bad final beam collimation (but ok for short distance) WP03

  15. Laser test at LNL with excimer Aluminum ionization with a single wavelength Pulse. 15 ns λ=308 nm Al photo ionization Need of NEW TUNABLE Solid State Laser System for otherelements Laser Ionization!!! Laser beam LPX200XeClexcimerlaser Laser beam (phosphorescence on plastic dump) Hot Cavity The laser beam shape is focalized into hot cavity of 3 mm. diameter and 6 m. far away

  16. Beam for SPES According with the letters of intent So far, 24 LoI’s received for reaccelerated RIB

  17. SPES ROAD MAP Commissioning2015:Delivery of infrastructure2015-2016Commissioningof subsystem 2) Operational-> 2017 : 40 MeVCyclotron - 2017  I = 5   μA, UCx  (13 mm) ; (SIS) : Rbe Cs- 2018  I= 50 μ A, SiC(40 mm full scale); (PIS-LIS): Al- 2019  I= 150 μ A,UCx(40 mm full scale); (LIS): Sn

  18. Tin in other facilities Power and wavelength considerations: Contaminants considerations: Hot cavity high temperatures provides high rates of contaminants at first mass separator for 132Sn due to 132Cs. => Lower temperature for hot cavity => Engineering hot cavity materials (work functions) => Higher laser repetition rate Doubling rep rate (@ samepulseenergy) Doubling ioncurrent Doubling efficiency

  19. Target and Ion Sources > New Laser Ion Source Developments Laser ionization system requirements: Reference element: for Tin Possible requirements: Bandwith: Base: 5 GHz (< 0,2 cm-1) ; Narrow: 1 GHz (< 0,04 cm-1) Energy per Pulse: > 50 uJ (UV < 300 nm) ; > 500uJ (fund) Pulse duration: 20 < t < 30 ns Freq Rip: 20 kHz

  20. Target and Ion Sources > New Laser Ion Source Developments Laser ionization system requirements: Reference element: Al Possible requirements: Bandwith: Base: 5 GHz (< 0,2 cm-1) ; Narrow: 1 GHz (< 0,04 cm-1) Energy per Pulse: > 50 uJ (UV < 300 nm) ; > 500uJ (fund) Pulse duration: 20 < t < 30 ns Freq Rip: 20 kHz

  21. Company custom proposal for SPES TiSa laser system Master Oscillator + Power Amplifier (MOPA) Ti:Satunable laser. Proposedspecification. Repetition rate: 20 kHz Wavelength: 690 – 950 nm Output energy: 0.5 mJ Pulseduration: 15 ns Pulsejitter: <1 ns Linewidth: 5-10 GHz Narrow line option: 1 GHz

  22. Company alternative proposal for SPES laser system Master Oscillator + Power Amplifier (MOPA) OPG Power Amplifier In allcaseswhereshorterpulses are accepted, (range < 1 nsec), the OPG conceptmayrepresent a validpracticalapproach: spectralproperties are defined by the narrow band lowpowerseeder and the beamqualityisreasonablypreserved by the OPG stage. In allcaseswhereshorterpulses are accepted, the OPG conceptmayrepresent a validpracticalapproach: spectralproperties are defined by the narrow band lowpowerseeder and the beamqualityisreasonablypreserved by the OPG stage. Ideal sources for seeding are mW+ leveltunable laser dides, featuringsuperiorstability, narrow line scanning, relatively wide mode hop free operationranges. No jitter and pulsebuild-up variationbetweenpump and NIR output allow precise synchronization of severalchannels. The OPGconcept. An alternative approach to solid state laserstunable in the Near IR regioniscurrentlybeinginvestigated in R&D activitiesatBright Solutions. Itisbased on Optical Parametric Generation (OPG) in the range 680-1000 nm, whenpumped by 532 nm DPSS lasers. OPG isparticularlyefficientwhenpumped by high peakpowerlasers with pulselengthcomparable with the non-linear crystallength. Sub nspulses are ideal, 2 – 3 nspulses can also be used with reasonableefficiency. Itisnot the mostefficientchoicewhenpulsewidth >10 ns are desired. Nevertheless the tuningconcept and narrow band operationisgreatlysimplified.

  23. Conclusion

  24. Current status and overview • Letter of Intents: under discussion to select first-day-exp. • ISOL Target and Ion Source: working in off-line laboratory. • Layout for pre-acceleration: defined. • Authorizations ready for cyclotron operation. • Contract for cyclotron: signed November ‘10, final design accepted (June ’11), cyclotron under machining. • Building project: ready, financed (June ‘12), bid on the way. • Phase β and γ partially financed (July ‘12) • Starting of Laser System R&D • Expected ground breaking March 2013.

  25. Meanwhile….. New off-line laser lab in LNL under construction.. SPES Laboratory area New Laser (off-line) Lab

  26. Meanwhile….. New off-line laser lab in LNL under construction.. Estimated end of works: March ‘13

  27. Laser R&D at LNL • Beginning 2013: • Build of a new off-line solid state laser lab in LNL • 2013 – 2017: • Measure and tests with solid state solutions at 20 kHz rep rate • 2017: • First SPES beam laser ionization on-line

  28. Thank you! (Waiting for answers…)

  29. Pavia Laser Laboratory Setup Complete laser photoionization system structure • 1 Pump Laser: • Quanta System G.Y.L 101/102 • Nd:YAG laser • Impulse Energy up to 300mJ • Repetition rate max 10Hz Since April 2010: the 3 tuneable laser are ON • 3 Tuneable Dye Laser : • Lambda Physik FL3002E and Lambda • Physik LPD3002E • Bandwidth 0,2 cm-1 • Repetition rate according to pump complete 3λionization scheme

  30. Target and Ion Sources > Possible Italian partner for laser system developments Bright Solutions S.r.l was founded in 1998 by group of laser scientists and industry experts with significant experience in diode-pumped solid state laser engineering. From the origin the Company’s activity was oriented towards the development of the state-of-the-art DPSS laser sources with a goals of superior efficiency, compactness and reliability.

  31. Company custom products brief history Possible portfolio baseline for SPES laser project • CZMILUS Program • (Coastal Zone Mapping and Imaging Lidar) • Development of a custom laser source with 6mJ pulse energy in 2ns (3 MW) at 10 kHz. • Two collinear laser beams, 35W at 532nm and 25W at 1064nm, are provided at laser output. The beam at 532nm detects the sea bottom, radiation at 1064nm detects the sea surface. Several rugged units have been delivered, accumulating hundreds of flight hours each. 2010 WidelyTunableTi:Sa 750-900 nm 10 kHz ; 10 ns 0.5 – 1 W Application: In Vivo Medical Diagnostics (University of Arkansas for MedicalSciences).

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