Transcript Slide 1

First measurements for SPECTRAP
Bettina Sommer
GSI, Uni Giessen
„my“ beamline
Argon+ ions
~10-8 mbar
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Schematik beamline
Source
Kollimator
Faradaycup
Bender
Einzel-Lenses
Measured beam profile
Steerer
0
0
-20
~ 0,5cm
Y
X
VakuumPumps
-20
-40
-40
-60
-60
Koll above
Koll left
0,0
0,5
1,0
1,5
0,0
2,0
0,5
1,0
1,5
2,0
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Beamline overview
Source
Bender
Faradaycup
Steerer
Einzel-Lenses
Kollimator
VakuumPumps
Einzel-Lens &
Deflector
Valve
Pulsed drift tubes
Magnet
Penningtrap
HelmholtzCoils
Floureszenz
Detector
Laser
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Simulations of the beamline
● first simulations with COSY
Einzel-Linsen
Einzel-Linsen
x-Richtung
Ablenker
y-Richtung
Ablenker
● further simulations with SIMION
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Simulations in SIMION
EinzelLinsen
Ablenker
EinzelLinsen
Deflektor
gepulste
Driftröhren
EinzelLinsen
Falle
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using the drift tubes
Grid
Ions
Ion cloud
-For 1µs 500V on grid: length of cloud = ~5cm
-Number ions: ~105
- cross section: ~1cm
-Pulser for drift tubes: rise time ~ 200ns
 Cloud of 2,5cm better and still possible
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