a ln2-cooled electrostatic ring -...
TRANSCRIPT
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A LN2-COOLED ELECTROSTATIC RING
T. Azuma, S. Jinno, T.Takao, K. Hanada, H. Tanuma, K. OkunoDept. of Physics, Tokyo Metropolitan Univ., JAPAN
Y. Yasuda, M. Gotou, H. ShiromaruDept. of Chemistry, Tokyo Metropolitan Univ., JAPAN
“COOL05” at Galena IL,USA (Sep.21,2005)
A progress report since COOL-03 (POSTER presentation)
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He+, Ne+, Ar+, Kr+, Xe+
CO+, CO2+ , CO2+ , CO2
2+
C60+, C70
+, C84+ , C60
-, C70-, porphyrin-
What we have stored in TMU E-ring
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Ion storage for more than 1 min.
Ion storage at LN2 temperature
Magnet-free ion injection system in combination ofpulsed-HV and Laser desorption ion source.
Simultaneous storage of several kinds of ions, andselection of a specific ion by bunching technique
We started spectroscopy of cluster/molecular ionsby introducing tunable visible OPO-LASER
- metastable molecular ion- cluster/biomolecular ions
Outline
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30 keV C60+ :
2.7 T
30 keV C60+ :
distance between electrodes: 30 mm, voltage 7.2 kV
qE /ε∝qmB /ε∝
For bending 20kV(=V0) ions at the radial curvature of r0 = 25cm Magnetic control Electric control
ion mass m and charge q dependence
Characteristics of E (electrostatic) -Ring
storage of very heavy ions
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High Luminosity
Vibrationally cooling down to LN2 temp.
Detection of neutral product
Beam or Laser
Characteristics of E (electrostatic) -Ring
suitable for atomic physics, chemistry, solid state physics of huge molecular ions (cluster, biomolecule, nano-particle )
No mass restriction of stored ions
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SECOND (KEK Tanabe)
Electrostatic Ion Storage RingsFIRST (ELISA, Aarhus(DEN))
THIRD (TMU)
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Manne Siegbahn Institute
(Stockholm, Sweden)LHe temp. Double ring:
Max Planck Institute
(Heidelberg, Germany)
LHe temp.
Hugh complex of various
ion sources etc..
E-ring under construction
10 m
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TMU E-Ring under Construction at Toshiba
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total length: 7.7 m( 30 keV H+ period: 3.2 µs )
vacuum 10-9 Pa order
TMU E-Ring
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160º deflector
quadrupole
design/manufacturing/assembly
taking heat shrinking into account
(0.5 mm precision)
electrode: Au plated
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Neutrals
Neutrals
Ion beam
DEF 10QDQFViewer
Scraper
BPM
Merging beam
LN2 LN2
RF
VST
Fragments
DEF 160
trajectory control
160ºdeflector(DEF160) ×210ºdeflector(DEF10) ×4Quadrupole (QD,QF) ×4Deflector (VST) ×4
Totally 52 electrodes
TMU E-Ring
total length: 7.7 m( 30 keV H+ period: 3.2 µs )
vacuum 10-9 Pa order
similar lattice structure to ELISA, and KEK-ring
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regular operation at 80 K
Characteristics of TMU E-Ring
magnet-free ion injection system1) TOF-mass selection of pulsed beam at the injection region2) FT-mass selection of all ions after injection to the ring
enough spaceat the bending region to insert the detection system of product ions(mass/charge changed)
(2 round chamber of diameter in 80cm,height 40cm)
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fin-heater
coveringby heat-insulation material
temp. averagingby fan
Baking
5 kW6 kW×2
Temp. monitoring•mantle heater•fin heater•linear section
analysis section
linear section
•mantle heater
UHV is critical
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In OutPipe 2 Pipe 1
Cooling
InOut
Cooling of low-temp. shield and electrodes by circulation of LN2 through pipes1,2
(CF. Whole ring in a pool of LN2 at Aarfus)in the ring: radiation >> conduction
Cooling of electrodes by circulated LN2 in the ring
automatic production and circulation system of LN2
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Three-folded Structure for Heat-InsulationLN2 cooling of low temp.
shielding
connection of low temp. shield and electrodes by insulator
sustention of low temp. shielding by titanium-alloy rod with high insulation
reflector for preventing from radiation between low temp. shielding and vacuum wall
design/manufac./assembly considering heat shrink (0.5mm precision)
surrounding of 80% of beam trajectory by LN2
Electrode
Shield
Reflector
Pipe for LN2
Rod
100 mm
Large gas emission volume
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Ion Injection System
E×B ion selection
Chopping deflector for pulsed beam extraction
4-stage differential pumping
1m
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10°DEF
dlectrostatic 4-pole deflector
Duoplasmatron
Einzel lens
Chopping deflector
Wien filter
ion lens
Laser ablation cluster ion source
Ring
laserDuoplasmatron
ion current :µA ~ mApositive/negative ion
Cluster ion sourcecarbon cluster ion fullerene ionpositive/negative ion
Ion Sources and Ion Injection System
+/-30 KV
TOF mass selection
ESI ion source (in prep.)
+/-30 KV
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HV(~13.5kV)
PulsedHV
(3.5kV)
LASER(266nm, 10Hz , 5ns)
Carbon Cluster Ion Source
acc. tubeInte
nsity
(arb
.uni
t)
Time of flight
C60+
Laser desorption
Laser
Inte
nsity
(arb
. uni
t)
Time of flight
C3+
C4+
C5+
C6+
C7+
C8+
Laser ablation
Laser
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Rare gas atomic ions from Duoplasmatron: He +, Ne +, Ar +, Kr +, Xe +
Neutral Product Detector- useful both for DC and BUNCHED beam
Pickup Detector- useful for BUNCHED beam(useless for DC beam )
Beam Storage Test
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Monitor for Beam Diagnosis
Pickup Detector
Neutral Detector
Neutral Detector x 1Pickup Detector x 4
scaler PC
PC
Pre-Amp
CCD camera
TIME
POSITION
NeutralParticle
2nd.e-Fluo. PlateMCP
φ 45 mm
Acc. Vol. 3.0 kV
Φ50 mm
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Neutral Detector [2D-position]
Neutral 2ndary e
Phosphor ScreenMCP
Position-Information
CCD camera
micro-channel Plate (MCP) ( 2stage, 45mmφ)+ Phosphor Screen + CCD camera
-20
-10
0
10
20
-20 -10 0 10 20
y /m
m
x /mm
CCD
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0 200 400time (ms)
105
103
10
coun
ts
350 µs
2 µs
10°DEF
chopper
50 µs/channel
0V3kV
0V150V
σ~10-15cm2
τ~100 ms
2 µs/channel
2 µs
18 µs FT
FEB. 26/2004
20keV Ne+ 106 ions/pulse, 6.5×10-6 Pa FIRST STORAGE
Neutral Detector [time]
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124Xe: 0.1%126Xe: 0.09%128Xe: 1.91%129Xe: 26.4%, 89.6 kHz130Xe: 4.1%131Xe: 21.2%, 88.8 kHz132Xe: 26.9%, 88.4 kHz134Xe: 10.4%, 21.9 kHz136Xe: 8.9%
Separation of isotopes
FT mass spectroscopy of Xe+ JULY / 2004
86 87 88 89 90 91 92
Sign
al a
mpl
itude
/arb
. uni
t
F requency /kH z
4th H arm onics
136Xe+
134Xe+
132Xe+
131Xe+
130Xe+
129Xe+
∆E/E=565
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X+ + H2 → X0
5×10-9 Pa20 keV
Storage Time of Rare Gas Ions~5.0×10-9 Pa, observation of storage = ~ a few min.
Xe+ 23s Kr+ 17s
Ar+ 7.5s
He+ 4s
Ne+ 12s 8.0 x 10-16Ar+
6.0 x 10-17Ne+
2.5 x 10-16He+
σcap /cm2
electron capture
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Beam Intensity Dependence of Storage Time
Ar+
space charge effect ?
400 nA180 nA
90 nA
30 nA
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q1
q4
q3
q2
O x
y
Φ50 mm
4 segmented electrodes: beam position
SEP / 2004Beam Position Monitor (BPM) TYPE II
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Beam Center Observed by 2D-Position Monitor
-10
-5
0
5
10
-10 -5 0 5 10
BPM 2
down
in out
x /mm
up
y /m
m
-10
-5
0
5
10
-10 -5 0 5 10
BPM 3
down
in out
x /mm
up
y /m
m
-10
-5
0
5
10
-10 -5 0 5 10
BPM 1up
x /mm
y /m
m
down
outin
-10
-5
0
5
10
-10 -5 0 5 10
BPM 4up
x /mm
y /m
m
down
outin
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Room temperatureNeutral detectorBPM4BPM1 BPM2 BPM3
Beam trajectory under room temp. and LN2
Influence of the thermal shrinking: yes but not much
LN2 temperature
1/2
shrinking of electrodes: max.~ 1mmdeviation form the center
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Beam trajectory under room temp. and LN2
LN2 temperature
After adjusting the parameters (less than 1%)
2/2
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Bunching of DC-beam: Ar +
Selection of a specific ion after simultaneous storage of severalkinds of ions : C60
+ , C70+
De-Bunching and Bunching DEC / 2004
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Ar+
20 keVwidth10 µs~107ions/pulsePeriod 25 µs
OSCILLO
Bunch Structures for Different Time Windows
DC after 60ms
0 50 100 150 200
Am
plitu
de (a
rb. u
nit)
Time (µs)
x 10
x 10
0 ms
60 ms
30 ms
15 ms
5 ms
1 ms
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RF offRF on
Ar+ 20 keVPulse Width~25 msequiv. to single circulation
~25 µs
20 bunches300 µs after RF-on
Good for merging experiments with a pulsed LASER due to Better S/N ratio in coincidence
RF (f = 800 kHz, Vpp = 20 V)
Bunching of DC-beam DEC / 2004
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OPO LASER
Laser spectroscopy with OPO tunable LASER
AUG / 2005
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Carbon Cluster IonPositive C60
+ , C70+
selection of specific ions for simultaneous storage of several species of ions
Negative C60- , C70
-
Large Molecular IonNegative Porphyrin H2TPP-
LASER spectroscopy
PHYSICS and CHEMISTRY under way
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10nA(105ions/pulse)
132840C70+122720C60+2940Ar+
T (μs/period)Mass(amu)
Fullerene Cations C60+, C70
+ Simultaneous Storage
0.5 1 1.5 2 2.5
Inte
nsity
T ime(m s)
C60+ C70
+
MAR / 2005
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Bunching of Specific Ions
1.8 1.9 2.0 2.1 2.2
Sign
al a
mpl
itude
(arb
.init)
Storage time (ms)
△△
△
( :C60+, :C70
+)
0.4 0.5 0.6 0.7 0.8
Sign
al a
mpl
itude
(arb
.uni
t)
Storage time (ms)
△
△
△
○ ○
○
RF on
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long range profile
Ion storage profile of fullerene anions C60-
storage time [msec]
neutral detector:
short lifetime : autodetachment of electronlong lifetime : collision with residual gas
1 sec
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FT
Ion storage profile of fullerene anions C60-
pickup detector:
105 per bunch
200 msecC60
-
C58-
fragments
C60-
C58-
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M- + hv M + e-
highly-sensitive
selective electron detachment
M-
M-*
M + e-
(Resonance Enhanced Multi Photon Electro Detachment Spectrum)
carbon cluster anions
(C5- ~ C21
- , C60-,C70
- )
Electronic state of anions and structure of cluster
REMPED Spectrum
Negative ions + tunable LASER: Electron Detachment
REMPED Spectra
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(Resonance Enhanced Multi Photon Electro Detachment Spectrum)
Gas phase C60-
C60- Solution
T. Kodama et al, (1994) TMU Cluster-chemistry Group
Broad spectra due to high temperature of ions
REMPED Spectrum
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REMPED Spectrum
Tomita et al PRL 94, 053002, 2005ELISA
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Porphyrin anions H2TPP-
H2TPP(5,10,15,20 tetraphenyl-21H,23H porphyrin)Anion made by MALDI technique (matrix assisted laser desorption )
absorption of570 nm photon
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Ion storage profile of Porphyrin anions H2TPP-
long lifetime comp.: 1.7sec
short lifetime comp.: 5.3msec
storage time [ x 10msec]
short lifetime : autodetachment of electronlong lifetime : collision with residual gas
Neutral detector
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1
10
100
1000
104
0 50 100 150
H2TPP_neutral
counts
蓄積時間 / ms
5.3 ms
1.7 s
merging with OPO-tunable LASER
absorption of 570 nm photon
Storage time
9.3 ms
LASER merging exp. of Porphyrin anions H2TPP-
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Meta-stable IonDoubly charged molecular ion: CO2+, CO2
2+
check of proper operation of lifetime measurementscomparison with previously reported data
LASER spectroscopy
PHYSICS and CHEMISTRY under way
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12C18O2+
20kev
0.76 ms
8.1 ms3.6 s
lifetime of metastable state: msec~sec
Storage of Positive Doubly Charged Ions: CO2+
4.26×10-9 Pa
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L H Andersen, et. al., Phys. Rev. Lett. 71 (1993) 1812
0.76 ms
8.1 ms3.6 s
CO2+
20kev
4.26×10-9 Pa
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-111.65
-111.60
-111.55
-111.50
-111.45
-111.40
-111.35
-111.30
1 2 3 4 5 6
CO2+ Potential
Ener
gy /H
artre
e
Internuclear distance /au
1∆
1Π
1Σ+
3Π
3Σ+
21Σ+
3Σ-
12C18O2+
3.6 s3Π
3Πv=0
8.1 ms1Σ+
1Σ+v=0
0.76 ms3Π
3Πv=0
C++O+
Decay rate through tunneling depends on the electronic states.
Storage of Positive Doubly Charged Ions: CO2+
Calc. by K.Ohtsuki
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-111.65
-111.60
-111.55
-111.50
-111.45
-111.40
-111.35
-111.30
1 2 3 4 5 6
CO2+ Potential
Ener
gy /H
artre
e
Internuclear distance /au
1∆
1Π
1Σ+
3Π
3Σ+
21Σ+
3Σ-
12C18O2+
3.6 s3Π
3Πv=0
8.1 ms1Σ+
1Σ+v=0
0.76 ms3Π
3Πv=0
LASER-excitation
C++O+
LASER spectroscopy of CO2+ Now under way / 2005
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Ion storage for more than 1 min.
Ion storage at LN2 temperature
Magnet-free ion injection system in combination ofpulsed-HV and Laser desorption ion source.
Simultaneous storage of several kinds of ions, andselection of a specific ion by bunching technique
We started spectroscopy of cluster/molecular ionsby introducing OPO-LASER
- metastable molecular ion- cluster/biomolecular ions
Summary
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The end
終