Mikhail Goncharov
CS-Workshop 2013
GSI, Darmstadt
STORED AND COOLED IONS DIVISION
Control Systems around Penning trap
mass spectrometry
Penning Trap Mass Spectrometry
Basic trapping principles
Cyclotron frequency:

B B
1 q
c 
B
2π m
Quadrupolar E-field
B
z0
r0
V
Ring electrode
νz
Axial frequency:
1
z 
2
qV
2
md
Modified radial frequencies:
ν+
c  
  

2
4 2
2
c
ν-
    
and for mass spectrometry:  c   +  Invariance theorem gives:
2
c
2
z
2

2
-
2
z
STORED AND COOLED IONS DIVISION
q
q/mm

End-cap
electrodes
Penning Trap Mass Spectrometry
Frequency measurement techniques
Time-of-Flight ICR Detection
Phase Imaging ICR Detection
8 mm
1 mm
STORED AND COOLED IONS DIVISION
Image Charge FFT Detection
Penning Trap Mass Spectrometry
Control Systems for ToF-ICR (e.g. CS-SHIPTRAP)
Time-of-Flight ICR Detection
rf-synthesizers
Data Acqusition
(incl. automation)
Voltage Sources
and Switches
mm6 (sequences,
scans, etc…)
FPGA-Based
PPG and MCS
STORED AND COOLED IONS DIVISION
Data Analysis
Penning Trap Mass Spectrometry
Control Systems for FT-ICR (e.g. CS-PENTATRAP)
rf-synthesizers
Data Acqusition
(incl. automation)
Voltage Sources and Switches
…sequencers
FFT-Analyzers
…data archivers
Image Charge FFT Detection
FPGA-Based PPGs
ORTEC MCS
STORED AND COOLED IONS DIVISION
…scanners
…from CS-Workshop 2012
CS-PENTATRAP ToDo?
1. Main Front Panel (for ‘end-users’) the very last step to implement
too small experiment
3. Providing scans of several objects in parallel (rel. to 1.)
4. ‘Online’ data analysis tool (fitting routines)
no systematics yet
5. FFT Analyzer – record of a time domain signals is still
under a question mark
The setup still does not operate!

STORED AND COOLED IONS DIVISION
2. Measurement Data Base – PHELIX? 
Penning Trap Mass Spectrometry
Phase Imaging Ion Cyclotron Resonance (PI-ICR)
Penning trap
position-sensitive detector
STORED AND COOLED IONS DIVISION
B
  2n

;
2t
slides provided by Dr. S. Eliseev
 R
 

;
2t tR
A
 
2Rt
Penning Trap Mass Spectrometry
Phase Imaging Ion Cyclotron Resonance (PI-ICR)
Delay-Line MCP-based positionsensitive detector © RoentDek GmbH
42 mm
25 mm
position resolution
70 mm
slides provided by Dr. S. Eliseev
STORED AND COOLED IONS DIVISION
active diameter
channel diameter
Penning Trap Mass Spectrometry
PI-ICR Control System
DAQ is based on RoentDek TDC8HP
high-resolution multi-hit Time-to-Digital Converter
Channel
1
2
3
4
5
6
Purpose
X1
X2
Y1
Y2
MCP-plate signal (tMCP)
Trap ejection trigger (t0)
TDC Data
Processing
Variable
X1 – X2
X1 + X2
Y1 – Y2
Y1 + Y2
tMCP – t0
< 100 ps with 25 ps LSB
-209 us to +209 us
up to 500 000 particles / s
< 10 ns
Meaning
x-coordinate
x-delay-line length
y-coordinate
y-delay-line length
tTime-of-Flight
STORED AND COOLED IONS DIVISION
time resolution
group range
Throughput
double-hit dead-time
Penning Trap Mass Spectrometry
PI-ICR Control System
Cartesian Phase Imaging
and ToF for completeness
x-coordinate
y-coordinate
tTime-of-Flight
STORED AND COOLED IONS DIVISION
X1 – X2
Y1 – Y2
tMCP – t0
Calibration histograms
X1 + X2
Y1 + Y2
x-delay-line length
y-delay-line length
Penning Trap Mass Spectrometry
Preliminary Data Analysis
Gaussian Fits in Cartesian and polar coordinates
mm6 (sequences,
scans, etc…)
FPGA-Based PPG
Agilent rf-synthesizers
for phase scans etc.
STORED AND COOLED IONS DIVISION
PI-ICR Control System & CS-SHIPTRAP
Penning Trap Mass Spectrometry
PI-ICR Preliminary Results
(Mass differences between
129Xe
and
130Xe
with ToF-ICR and
*
PI-ICR )
STORED AND COOLED IONS DIVISION
rToF  ICR
 3.7
rPI  ICR
* see S. Eliseev et al., PRL 110, 082501 (2013)
Acknowledgments
Thank you for attention!
STORED AND COOLED IONS DIVISION
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