precision measurements of very-short lived nuclei using an advances trapping system for...
TRANSCRIPT
Precision Measurements of Very-Short Lived Nuclei
Using an Advances Trapping System for Highly-Charged Ions
q / A - selection Cooling process Mass measurement
Ion productionFRS Low
Energy Branch
DetectionBeam bunching Charge breeding
PreparationPenning trapMass Analyzer
PrecisionPenning trap
Time-of-flightdetector
c Q
TOF
EBITRFQ
Frank Herfurth, GSI-Darmstadtfor the MATS Collaboration
MATS
CSNSM-IN2P3-CNRS Orsay: G. Audi, C. Bechelet, D. Lunney, C. Guénaut, M. Sewtz
Universität Greifswald: A. Herlert, G. Marx, L. Schweikhard
Universität Erlangen-Nürnberg: P.-G. Reinhard
GSI-Darmstadt: D. Beck, M. Block, H. Geissel, F. Herfurth, Yu.A. Litvinov,Yu. N. Novikov, C. Scheidenberger, M. Winkler, C. Yazidjian
CERN/GSI-Darmstadt: A. Kellerbauer
Universität Mainz: K. Blaum, I.Bloch, S. Djekic, R. Ferrer, S. George,S. Kreim, W. Nörtershäuser, S. Stahl, J. Verdu, C. Weber
Universität Gießen: W. Plass
Universidad de Huelva: D. Rodríguez
University of Jyväskylä: J. Äystö, A. Jokinen, I. Moore, A. Nieminen
LLNL-Livermore: D. Schneider
LMU München: D. Habs, S. Heinz, O. Kester, V. Kolhinen, J. Szerypo, P.G. Thirolf
Michigan State University: M. Bender, G. Bollen, M. Matos, S. Schwarz
MPI KP Heidelberg: J. Ullrich, J. R. Crespo López-Urrutia
Universite Libre de Bruxelles: P.-H. Heenen
Stockholm University: T. Fritioff, R. Schuch, N. Szilard
Kolkata India: A. Ray
The MATS collaboration
16 Institutes53 Members
effective use of rare species
extended observation & interaction time
high quality q/m selection
manipulation of charged particles at low E
accumulation & bunching
charge breeding
polarization
EFFICIENCY
ACCURACY
SENSITIVITY
Mass measurements and trap assisted nuclear spectroscopy
Trapping
0.0
0.1
m
0.1
m
PreparationPenning trap
M easurem entPenning trap
EBIT
Side V iew
H V C age
G round F loor
H V C age
10.5 m
EBIT:charge breeding
Magn. deflector:q/m separation
Cooler trap:beam preparationspectroscopy
Precision trap:mass measure-ments
Detectors:- FT-ICR- TOF-ICR- Si(Li) electron
Bm
qfc
2
1
Setup
0.0
0.1
m
0.1
m
PreparationPenning trap
M easurem entPenning trap
EBIT
Side V iew
H V C age
G round F loor
H V C age
10.5 m
EBIT:charge breeding
Magn. deflector:q/m separation
Cooler trap:beam preparation& spectroscopy
Precision trap:mass measure-ments
Detectors:- FT-ICR- TOF-ICR- Si(Li) electron
Bm
qfc
2
1
Experiments with Exotic Nuclei
Mass
T1/2 ...
Laser Spectroscopy
X- ray Spectroscopy
In-Trap Spectroscopy
RFQ and Mass Analyzer/Separator
T. Dickel, W.R. Plaß, Univerisität Gießen
• Electron-impact ion source• Analyzer with two grid-free electrostatic reflectors based on a four-electrode design (A. N. Verentchikov et al., Tech. Phys. 50 (2005) 73)
• MCP-detector• Kinetic energy 1.5 keV, overall length ~ 0.5 m• Short time of flight (~ 1 ms)
Currently:• Uncooled ion population• No differential pumping
Aberration limitwith uncooled ionsm/m = 70,000
with cooled ionsm/m > 105 (expected)
0 500 1000 1500 2000 2500
0
20000
40000
60000
80000 Simulation Experiment
m = 28 u
Number of Turns
Ma
ss R
eso
lvin
g P
ow
er
m/
m
PreparationPenning trapMass Analyzer
PrecisionPenning trapRFQ EBIT
T. Dickel, W.R. Plaß, Univerisität Gießen
RFQ and Mass Analyzer/Separator
T. Dickel, W.R. Plaß, Univerisität Gießen
PreparationPenning trapMass Analyzer
PrecisionPenning trapRFQ EBIT
PreparationPenning trapMass Analyzer
PrecisionPenning trapEBITRFQ
Charge Breeding
• cryogenic – XHV• Helmholtz coils – open access
Titan EBIT, J. Crespo et al.
z
Voltage/Current Amplifier
Pe nning Tra p(c ro ss se c tio n)
ra d ia lly sp lit e le c tro d eslit
FFTFou rie r-Transfo rm - spectra l analyser
excited ion
m agnetic fie ld
low noiseAm p.
timetime-domain frequency-domain
I
frequency
d P /d fion current signal
mass spectrum
FFT
PreparationPenning trapMass Analyzer
PrecisionPenning trapEBITRFQ
Single Ion FT-ICR
Resonance of the unloaded LC-circuit at T = 4K
C. Weber et al., Eur. Phys. J A 25, 65 (2005)816500 817000 817500 818000 818500
1E-3
0,01
0,1
Frequency / Hz
Am
plitu
de A
U
c = 817380.61(12) Hz
Q = 14900
Amplification: 50000
RIS ion
C
QR
2
Universität Mainz, K. Blaum et al.
4-fold Penning Trap System
Ions from HITRAP or an EBIT
~75
mm
Monitor trap
Preparation trap2
Measurement trap
Preparation trap1
~10 mmB = 7 T
4.2 K
77 K
20 K
4.2 K
Universität Mainz, K. Blaum et al.
High precision trap for HITRAP (<10-11)New trapping and measurement techniques
Design parameters:
Overall efficiency 1-5%Maximum resolving power 108
Accessable half-life 10 msRelative mass uncertainty 10-9
Mainz, Greifswald, Jyväskylä, Stockholm: Penning trap systemGSI, Munich, Huelva: RFQ cooler and buncherHeidelberg, GSI, Livermore, Seattle: EBITGiessen, Mainz, Orsay: Detection system and electronicsMainz, Munich: Trap assisted spectroscopy
Organisation and responsibilities
MATS will be an advances trapping system for mass spectrometry, laserspectroscopy, and in-trap decay spectroscopy with highly-charged, short-lived ions.
PreparationPenning trapMass Analyzer
PrecisionPenning trapEBITRFQ
Summary
MOU prepared – to be signedSimulations ongoing