Current status and future plans The LARIS Laboratory

Transcription

1 Current status and future plans The LARIS Laboratory

2 Production Ionization Mass separation

3 1) Applicable to a wide range of elements Use up to 3 tunable lasers 2) High peak power to ensure efficient excitation and ionization Storage of atoms Pulsed laser between pulses High repetition Hot Cavity rate laser (>10kHz) 3) Need to focus into 3 mm diameter tube, >15 m away. Good beam quality Beam shaping optics and telescopes HOT CAVITY TARGET

4 Copper vapour laser: High peak power (short pulse); high repetition rate, good beam quality Dye lasers: Wide tuning range, ionization schemes with up to 3 steps Beam transport and observation system: Beam focusing, overlap and optimization + continual observation with reflected reference beam

5 RILIS beams of 28 elements are available so far: elements available at ISOLDE LIS 1 2 H ionization scheme tested He Li Be ionization scheme untested B C N O F Ne Na Mg Al Si P S Cl Ar K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe Cs Ba La Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn Fr Ra Ac Rf Ha Sg Ns Hs Mt Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr 4 types of ionization scheme: 2-step: (1 resonance) (2 resonance) 3-step: (2 resonance) (3 resonance)

6 Element Step 1 Step 2 Step 3 Setting up* Efficiency days 1, nm Dye P 1 typ, mw 2, nm Dye P 2 typ, 3, nm / 3, cm -1 Dye P 3 typ, mw off-line Rhod Pyrr 597 W 300 >7% Rhod 6G Rhod & CVL % Rhod B & CVL Rhod B % 4Be 3 12Mg 2 13Al 20Ca 1 21Sc 2 25Mn 2 27Co 2 28Ni 3 29Cu 2 30Zn 3 31Ga 1 39Y 2 47Ag 2 48Cd 3 49In 1 50Sn 4 51Sb 3 65Tb 3 66Dy 2 70Yb 2 71Lu 3 79Au 3 80Hg 3 81Tl 2 82Pb 2 83Bi 2 84Po Rhod & CVL Phenox Rhod & CVL Pyrr Rhod / CVL Rhod B Rhod & CVL Rhod B Rhod B / Rhod Phenox Rhod 6G Phenox DCM & CVL Rhod 6G & CVL Styr Phenox / CVL Phenox Rhod & CVL Ox DCM / CVL Rhod B & CVL Rhod B Styr / Styr Phenox Rhod / CVL Rhod 6G Rhod / Rhod DCM Rhod / CVL Pyrr Rhod 6G / Rhod 6G Rhod 6G DCM Phenox Pyrr Rhod B / Phenox LDS DCM DCM Rhod & CVL Rhod 6G Rhod B & CVL Rhod B Rhod & CVL Rhod Styr CVL Rhod Pyrr CVL % 15% 19% >3.8% >6% >7% 4.90% 21% 14% 10.40% 9% 2.70% 20% 15% >3% 0.10% 27% >3% 6%

7 Increasing demand 2007 Operation limited to ~1600 hours in 2007 This is due to the limited manpower (and uncertain reliability of the CVL based system)

8 2-5 exp. Per element Exp. (one per RILIS setup) OFF-line work RILIS start Run start Date stop Sep. Estimate of Setup (hours) Valentin REX tuning / Stable runs Scheduled Physics shifts Element Cu Hg Po Counted LASER hours (Valentin) 120 Counted total "shifts" IS Apr 25-Apr 30-Apr GPS Mg IS358 4-May 10-May 11/12 MayGPS 20 3 Cu IS May 12/13 May 16-May HRS 10 7 Ag IS413 6-Jun 9-Jun GPS 20 5 Mn IS368 GPS 3 Mn IS443 GPS 7 Mn IS432 GPS 3.5 Mn IS Jun GPS 1 Mn IS Jun 23-Jun GPS Mg IS Jul 17-Jul GPS Zn IS Jul 20-Jul HRS 20 6 Cd IS434 9-Aug HRS Sb IS Aug 11-Aug GPS Cu IS431 4-Sep 4-Sep GPS 5 16 Cu IS Sep 20-Sep 27-Sep GPS Sn IS411 2-Oct 4-Oct 11-Oct GPS Cd IS Oct 19-Oct 24-Oct GPS Mg LoI57 26-Oct 30-Oct 3-Nov GPS Po IS438 6-Nov 9-Nov HRS Be w/o MD FINAL Total shifts elements!

9 Advantages: Better beam quality Stability of operation Spectral coverage UV-NIR without gaps Questions: New ionization schemes Reliability Service Shift free RILIS operation and reduced maintenance/setup time = More RILIS runs

10 pulsed solid state lasers for ISOLDE RILIS providing visible and UV beams with total power up to 100 W at the pulse repetition rate of 10 khz and with a pulse duration of <20 ns - Extract from the abstract of the Invitation to Tender Beam A nm Beam B 532 nm Beam C 355 nm High quality beam for ionization Medium quality beam for dye laser pumping Medium quality beam for dye laser pumping Pulse repetition rate 8-15 khz 8-15 khz 8-15 khz Pulse duration ns ns ns Output pulse timing jitter < 3 ns < 3 ns < 3 ns Average power 40 W W W Power stability +/- 5% over 24 hours +/- 5% over 24 hours +/- 5% over 24 hours Beam divergence or M 2 < 0.1 mrad after expanding to 20 mm diameter M 2 = 5-20 M 2 = Beam pointing stability < 0.02 mrad after expanding to 20 mm diameter

11 Enquiries and contacts in : Coherent Inc. USA Lambda Physik AG Germany Spectra-Physics LAS GmbH Germany Lightwave Electronics USA Quantronix Corporation USA Positive Light, Inc USA - sent Spectron Laser GmbH Germany Groupe QUANTEL France LEE LASER, Inc USA THALES LASER S.A. France Photonics Industries International USA Powerlase Limited UK EdgeWave GmbH Germany General Atomics Photonics USA + Contacts with other companies at Laser exhibitions at Munich (2003, 2005) and CLEO Conference

12 DIODE Pumped Nd:YAG, Nd:YLF and Nd:YVO4 lasers 3 lasers: 2 x Green + 1 x UV - Short cavity : naturally shorter pulses - Specifications more or less satisfied in previously supplied lasers - CERN member state - Separate laser system - Small, relatively new company - Long term availability of parts/service? IS8II-E: Nd:YLF, pulse length 16ns at 10kHz, output average power 42W, M 2 = 1,7 IS8III-E: Nd:YLF, pulse length 17ns at 10kHz, output average power 20W, M 2 = 4,

13 DIODE Pumped Nd:YAG, Nd:YLF or Nd:YVO4 lasers 1 laser in a oscillator/amplifier configuration green and UV output beams - Possibly lower cost - Large, well established company - Close to required specifications allegedly already supplied to a defense company. - No convincing evidence of ability to produce required laser - Single laser system would mean no RILIS or complete setup of CVL in event of failure - Non CERN member state

14 Primary objectives: Investigate new ionization schemes (free from ISOLDE scheduling) Improve upon current schemes that rely on non-resonant ionization - search for auto-ionizing states Prepare for RILIS transition Solid State Laser system - different wavelength range (532 nm and 355 nm pumped dye lasers) Secondary objectives: Investigate RILIS selectivity improvements - HFS measurements (isomer selectivity) - Hot cavity optimization / material testing Tertiary objectives: Questions related to fundamental atomic spectroscopy, e.g. accurate determination of atomic ionization potentials. CERN/KTH collaboration FEDOSSEEV, Valentine (CERN) LINDROOS, Mats (CERN) LOSITO, Roberto (CERN) MARSH, Bruce (CERN) BERG, Lars-Erik (Royal Institute of Technology) LAUNILA, Olli (Royal Institute of Technology) PAUCHARD, Thomas (Royal Institute of Technology) TRANSTRÖMER, Göran (Royal Institute of Technology) VANNESJÖ, Johanna (Royal Institute of Technology) ÖSTERDAHL, Fabian (Royal Institute of Technology) Funding: Knut and Alice Wallenberg Foundation

15 Auto-ionizing state IP 1 2 Boxcar Integrator CEM 3 Wavelength Meter DC 3 kv (MS) Pulsed 32 V Nd:YAG 3 PDL Nd:YAG 2 OPO 2 2 generators Nd:YAG 1 OPO 1

16 Laser 1: (Continuum PowerLite OPO Mirage) Tuning range: nm (fund.), nm (2w) 532 nm, 10 Hz

17 Laser 2 (Spectra Physics Quanta-Ray PRO MOPO HF) Tuning range: nm (signal), nm (idler) 355 nm, 10 Hz MOPO-HF

18 Laser 3 - YAG pumped pulsed dye laser (532 nm Nd:YAG Dye tuning ranges: nm (fund.), >200 nm(2w) Quantel YAG Pump laser Hz Pulse energy: 350 mj (1064 nm) 160 mj (532 nm) 60 mj (355 nm) Pulse nm: 4.4 ns Lumonics Hyperdye Pulsed dye laser

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20 Ablation chamber Ulf Sassenberg - Summer 2007

21 Ablation laser Optical spectrometer Fluorescence excitation laser Gate valve Skimmer Reflectron TOF-MS Extraction optics Carrier gas Rotating rod, pulsed valve assembly Pump Bellow Ionizing laser beams Electrodes Pump Optional laser beam Questions related to fundamental atomic spectroscopy, e.g. accurate determination of atomic ionization potentials. Olli Launila

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23 Wider applicability LARIS Higher efficiency Greater selectivity New cavities/list Greater demand for RILIS beams RILIS upgrade Improved reliability Reduced setup time Thanks to: Knut and Alice Wallenberg Foundation