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Control Systems around Penning trapmass spectrometry
Mikhail Goncharov
CS-Workshop 2013GSI, Darmstadt
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Cyclotron frequency:
c
1
2
qB
π m V
B
q/mqm
B
Ring electrode
End-capelectrodes
z0r0
B
ν+
νz
ν-
z 2
1
2
qV
md
Axial frequency:
2 2c c z
2 4 2
Modified radial frequencies:
2 2 2 2c z -
c + -
Invariance theorem gives:
and for mass spectrometry:
Quadrupolar E-field
Penning Trap Mass Spectrometry
Basic trapping principles
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Penning Trap Mass Spectrometry
Frequency measurement techniques
Phase Imaging ICR Detection
8 mm
1 mm
Image Charge FFT Detection
Time-of-Flight ICR Detection
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Penning Trap Mass Spectrometry
Control Systems for ToF-ICR (e.g. CS-SHIPTRAP)
Voltage Sourcesand Switches FPGA-Based
PPG and MCS
rf-synthesizers Data Analysis
Data Acqusition(incl. automation)
mm6 (sequences,scans, etc…)
Time-of-Flight ICR Detection
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Penning Trap Mass Spectrometry
Control Systems for FT-ICR (e.g. CS-PENTATRAP)
Voltage Sources and Switches
FPGA-Based PPGs
rf-synthesizersData Acqusition
(incl. automation)
Image Charge FFT Detection
FFT-Analyzers
ORTEC MCS
…sequencers
…scanners
…data archivers
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1. Main Front Panel (for ‘end-users’)
2. Measurement Data Base – PHELIX?
3. Providing scans of several objects in parallel (rel. to 1.)
4. ‘Online’ data analysis tool (fitting routines)
5. FFT Analyzer – record of a time domain signals is still under a question mark
The setup still does not operate!
too small experiment
no systematics yet
the very last step to implement
…from CS-Workshop 2012
CS-PENTATRAP ToDo?
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Penning Trap Mass Spectrometry
Phase Imaging Ion Cyclotron Resonance (PI-ICR)
position-sensitive detector
B
Penning trap
Rt
A
tR
R
tt
n
2 ;
2 ;
2
2
slides provided by Dr. S. Eliseev
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Penning Trap Mass Spectrometry
Phase Imaging Ion Cyclotron Resonance (PI-ICR)
active diameter 42 mmchannel diameter 25 m
position resolution 70 m
Delay-Line MCP-based position-sensitive detector © RoentDek GmbH
slides provided by Dr. S. Eliseev
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Penning Trap Mass Spectrometry
PI-ICR Control SystemDAQ is based on RoentDek TDC8HP
high-resolution multi-hit Time-to-Digital Converter
time resolution < 100 ps with 25 ps LSBgroup range -209 us to +209 usThroughput up to 500 000 particles / s
double-hit dead-time < 10 ns
Channel Purpose1 X12 X23 Y14 Y25 MCP-plate signal (tMCP)
6 Trap ejection trigger (t0)
Variable MeaningX1 – X2 x-coordinateX1 + X2 x-delay-line lengthY1 – Y2 y-coordinateY1 + Y2 y-delay-line lengthtMCP – t0 tTime-of-Flight
TDC DataProcessing
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Penning Trap Mass Spectrometry
PI-ICR Control System
X1 – X2 x-coordinateY1 – Y2 y-coordinatetMCP – t0 tTime-of-Flight
X1 + X2 x-delay-line lengthY1 + Y2 y-delay-line length
Calibration histograms
Cartesian Phase Imagingand ToF for completeness
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Penning Trap Mass Spectrometry
Preliminary Data Analysis
PI-ICR Control System & CS-SHIPTRAP
Gaussian Fits in Cartesian and polar coordinates
FPGA-Based PPGAgilent rf-synthesizersfor phase scans etc.
mm6 (sequences,scans, etc…)
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Penning Trap Mass Spectrometry
PI-ICR Preliminary Results(Mass differences between 129Xe and 130Xe with ToF-ICR and PI-ICR*)
* see S. Eliseev et al., PRL 110, 082501 (2013)
7.3
ICRPI
ICRToF
r
r
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Acknowledgments
Dietrich Beck, Klaus Blaum, Michael Block, Christine Böhm, Holger Brand, Andreas Dörr,
Christian Dröse, Sergey Eliseev, Frank Herfurth, Dmitriy Nesterenko, Yuri Novikov,
Enrique Minaya Ramirez, Julia Repp, Christian Roux, Lutz Schweikhard, Stefan
Stahl, Sven Sturm, Stefan Ulmer and many others
Thank you for attention!
