FAIR - A Status Report + A Concept for Collinear Spectroscopy at TRIGA Mainz. Wilfried Nörtershäuser GSI Darmstadt & Universität Mainz

Transcription

1 FR - Status Report Concept for Collinear Spectroscopy at TRG Mainz Wilfried Nörtershäuser GS Darmstadt & Universität Mainz

2 Outline Collinear Laser Spectroscopy Basics LaSpec at FR / GS Concept Status MaSTER / University Mainz General idea and concept Summary and outlook

3 The LaSpec Collaboration Spokesperson: P. Campbell Deputy:W. Nörtershäuser Project Manager: Christopher Geppert Members: uha Äystö, onathan Billowes, Klaus Blaum, Bruce. Bushaw, osé R. Crespo López-Urrutia, ndreas Dax, Kieran T. Flanagan, Dietrich Habs, Gerhard Huber, Mark Huyse, ri okinen, Thomas Kessler, ouri Koudriavtsev, Magdalena Kowalska, Thomas Kühl, Francois Le Blanc, David Lunney, ain Moore, Gerda Neyens, Kari Perajarvi, Christoph Scheidenberger, Dieter Schneider, Maxim Seliverstov, Michael Sewtz, erzy Szerypo, Peter G. Thirolf, Marco Tomaselli, oachim Ullrich, Piet Van Duppen, Klaus Wendt, Claus Zimmermann Leuven, yväskylä, Orsay, GS, Munich, Mainz, Heidelberg, Manchester CERN, Livermore, Pacific Northwest

4 Nuclear Properties from tomic Spectroscopy im: determination of... nuclear g-factor and magnetic dipole moment g l and µ ) electric quadrupole moment Q) charge radius r 2 ) spin, parity p ) by measurement of... hyperfine structure isotope shift NMR in magnetic and electric gradient fields E HFS = ' ', ' δν = K ) NMS K SMS F E = K B 2 mag µ H e 0) = g 3 4 K K 22 2 where K = F F B = eqv zz 0) 1 2 µ N B Q V zz δ r 2, '

5 Collinear Laser Spectroscopy ion beam E kin <60 kev electrostatic deflection electrostatic lenses for retardation charge exchange cell Na) excitation & observation region laser beam fixed frequency o photo multiplier

6 ccessible sotopes LaSpec MaSTeR off-line on-line

7 LaSpec Experimental Setup 1 we are here low energy beam hall at the SuperFRS

8 LaSpec Experimental Setup 2 10 m LaSpec ions atoms 13 m LaSpec laser laboratory 55 m² MTS 210 m² RFQ dipole annex building 6b --second floor-- gas catcher? inverse cyclotron? ions from Super-FRS???

9 Scheme of LaSpec Techniques & Responsiblities ions from SFRS gas catcher dipole magnet rfq cooler & buncher switch yard collinear ion spectroscopy laser desorption RS GS, Germany resonance ionization laser ion source yväskylä, Finland GS & Mainz, Germany Orsay, France Manchester, UK opt. pumping & fast atom beam Mainz, Germany β -asymmetry NMR Mainz, Germany Leuven, Belgium Total cost: ~ 590 k Commitment by collab.: 540 k MTS spectr. on highly charged ions Heidelberg, Germany

10 ccessible sotopes at LaSpec LaSpec examples: Yields of S-FRS 80 Zr Zr, 216 Pb, 207 u 10 5 /s 10 5 /s, 10 4 /s, 10 5 /s

11 Status of LaSpec status 16 pril 2007: current timeline: start of FR building construction Phase 2008 completion FR low energy branch 3 ) LaSpec under operation ) Completion of FR ) 1 year = tight scedule! idea: development of LaSpec components decoupled from FR construction

12 deal Scenario for LaSpec Development Development of a collinear laser spectroscopy experiment independent from FR timeline without beam time pressure during construction phase inside an area capable of handling radioactive isotopes off-line) with access to short-lived radioactive isotopes on-line) with good and uncomplicated availability of on-line beam time TRG research reactor, institute for nuclear chemistry, University of Mainz

13 "MaSTER" & "TRG-TRP" Mainz Spectroscopy Test TRG Reactor Experiment at the Klaus Blaum, Frank Herfurth, Wilfried Nörtershäuser, Christopher Geppert, ens Ketalaer, örg Krämer laser table Penning trap collinear laser beam line dipole mass separator ion source Support by: K. Eberhardt, H.-. Kluge, R. Neugart, N. Trautmann TRG reactor

14 ccessible sotopes LaSpec MaSTER off-line off-line Np Pu m Cm Cf on-line on-line thermal fission of 235 U or 252 Cf in the reactor, 1 10 mg target material thermal neutron flux: ~10 11 /s cm 2 ) yields of ~ /s on selected fission isotopes

15 RB Formation at the reactor carrier gas interspersed with aerosol particles laser table ion source options: collinear laser beam line surface ion source C plasma ion source ECR source...to be discussed Penning trap dipole mass separator ion source ion source reactor core fission target fission fragments on aerosol carrier breakup and ionization of fission products TRG reactor extraction & acceleration dc or pulsed)

16 LaSpec MaSTER Timetable LaSpec MaSTER 2008 start of construction phase 1 at FR transfer of MaSTER beamline components 2014 LaSpec on-line 2007 design of beamline 2008 start of beamline construction 2009 first test measurements, cont. beamline improvement 2009 off-line measurements 2010 on-line measurements 2013 transfer of MaSTER beamline components end

17 Thank you for your attention!

18 ccessible sotopes LaSpec MaSTER off-line off-line 237 Np 239,240,242,244 Pu 241,243 m 248 Cm 249,252 Cf on-line on-line thermal fission of 235 U or 252 Cf in the reactor, 1 10 mg target material thermal neutron flux: ~10 11 /s cm 2 ) yields of ~ /s on selected fission isotopes

19 Nuclear Properties from tomic Spectroscopy im: determination of... nuclear g-factor and magnetic dipole moment g l and µ ) electric quadrupole moment Q) charge radius r 2 ) spin, parity p ) by measurement of... hyperfine structure isotope shift NMR in magnetic and electric gradient fields E HFS = ' ', ' δν = K ) NMS K SMS F E = K B 2 mag µ H e 0) = g 3 4 K K 22 2 where K = F F B = eqv zz 0) 1 2 µ N B Q V zz δ r 2, '