Download - Variable Mode High Acceptance Spectrometer
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M. Rejmund/Ch. Theisen INTAG June 2005
Variable Mode High Variable Mode High Acceptance SpectrometerAcceptance Spectrometer
Detection and Tracking in VAMOS
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M. Rejmund/Ch. Theisen INTAG June 2005
Studies with VamosStudies with Vamos
In dispersive mode- direct transfer reactions: 24Ne(d,3Heγ…), 26Ne(d,pγ…), 56Ni(d,pγ)- multi nucleon transfer/deep inelastic reactions: 48Ca + 238U- fusion reactions: 76Kr + 58Ni In non-dispersive mode
- fusion reactions: 18O + 208Pb
Measures :- Bρ - angular distributions
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M. Rejmund/Ch. Theisen INTAG June 2005
VAMOS SpectrometerVAMOS SpectrometerSchematic ViewSchematic View
QUADRUPOLES
EXOGAM
BEAM
Focal Plane detection at 60°
DIPOLE
Velocity Filter
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M. Rejmund/Ch. Theisen INTAG June 2005
VAMOS in realityVAMOS in reality
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M. Rejmund/Ch. Theisen INTAG June 2005
VAMOS MeasurementVAMOS Measurement(dispersive mode)(dispersive mode)
YfXf
TOF
ΔE
E
φfθf
V
BρM/q
Mq
Z
φθ
M/q ~ Bρ x TOFM ~ E x TOF2
Z2 ~ E x ΔE ~ ΔE/TOF2
ResolutionΘ 0.1°
Φ 0.3°Bρ 0.5%M/q 0.5%q 1/30M 1/200Z 1/30
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M. Rejmund/Ch. Theisen INTAG June 2005
Light/Fast Ion Light/Fast Ion DetectionDetection Dispersive PlaneDispersive Plane
Drift ChamberX: charge distribution
2 x 64 pads (6.3x50) mmXFWHM ~200 μm
Y: drift timeYFWHM ~ 500 μm
Ionisation Chamber2 x 7 pads (50x50) mm1 x 7 pads (50x 170)mm
ΔEFWHM ~ 3%Plastic Detector
EFWHM ~ 4%
Silicon Wall
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M. Rejmund/Ch. Theisen INTAG June 2005
Light/Fast Ion Light/Fast Ion DetectionDetection Dispersive PlaneDispersive Plane
Drift Chamber
Plastic Detector
Ionisation Chamber
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M. Rejmund/Ch. Theisen INTAG June 2005
Heavy/Slow Ion Heavy/Slow Ion DetectionDetection
Ionisation Chamber Secondary electron Detector
Se-DXFWHM ~ 1 mm YFWHM ~ 2 mm TFWHM ~ 300 ps
Mylar emissive foil
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M. Rejmund/Ch. Theisen INTAG June 2005
Very heavy/slow Ion Very heavy/slow Ion Detection – non dispersiveDetection – non dispersive
Secondary electron DetectorSilicon Wall
QQWFD Mode
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M. Rejmund/Ch. Theisen INTAG June 2005
ExamplesExamples
Recoil Tagging – non dispersive Deep inelastic - dispersive
40Ca at 13.7 MeV/u + natTa 238U at 5.5 MeV/u + 48Ca
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M. Rejmund/Ch. Theisen INTAG June 2005
Very-heavy systems: RT and Very-heavy systems: RT and RDTRDT
Test experiment : Asymmetric reaction
208Pb(18O,4n)222Th
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M. Rejmund/Ch. Theisen INTAG June 2005
Energy loss versus ToFEnergy loss versus ToF
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M. Rejmund/Ch. Theisen INTAG June 2005
Recoil TaggingRecoil Tagging
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M. Rejmund/Ch. Theisen INTAG June 2005
Recoil Decay TaggingRecoil Decay Tagging
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M. Rejmund/Ch. Theisen INTAG June 2005
Deep Inelastic CollisionsDeep Inelastic Collisionsmeasured with VAMOSmeasured with VAMOS
40Ca at 13.7 MeV/u + natTa
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M. Rejmund/Ch. Theisen INTAG June 2005
Energy Loss versus Energy Loss versus EnergyEnergy
CaAr
SSi
MgN
eOC
Be
KCl
PAl
NaF
NBLi
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M. Rejmund/Ch. Theisen INTAG June 2005
Charge versus Proton Charge versus Proton NumberNumber
CaAr
SSi
MgN
eO
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M. Rejmund/Ch. Theisen INTAG June 2005
Mass versus Mass versus Mass/ChargeMass/Charge
All charge states
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M. Rejmund/Ch. Theisen INTAG June 2005
Mass versus Mass versus Mass/ChargeMass/Charge
40Ca
41Ca
42Ca
36Ar32S28Si
24Mg20Ne160
Fully stripped
One electron
Two electrons
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M. Rejmund/Ch. Theisen INTAG June 2005
MassMass
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M. Rejmund/Ch. Theisen INTAG June 2005
Deep Inelastic CollisionsDeep Inelastic Collisions(inverse kinematics)(inverse kinematics)
238U at 5.5 MeV/u + 48Ca
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M. Rejmund/Ch. Theisen INTAG June 2005
Online spectra of Online spectra of 5050CaCa
48Ca
49Ca
50Ca
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M. Rejmund/Ch. Theisen INTAG June 2005
ContinuationContinuation- Experimentally explore the limits of the existing setup to fully identify the nuclei within the M, Z, Q and E coordinates- Recoil Decay Tagging
To be obtained by- Short runs with the deep inelastic reactions induced by Ni, Ge, Kr … beams - Include ΔE measurement of nuclei stopped in gas- Improve the ToF resolution that limits the M/Q measurement
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M. Rejmund/Ch. Theisen INTAG June 2005
How to improve ?How to improve ?M/q ~ Bρ x TOF
M ~ E x TOF2
Z2 ~ E x ΔE ~ ΔE/TOF2Bρ : spectrometer resolution ~1/1000 Improve algorithm (easy)
ToF : ~ 1/100 (versus HF) « start » detector, e.g. in the W.F.
E : Plastic Silicon
ΔE : silicon detector ?
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M. Rejmund/Ch. Theisen INTAG June 2005
The MUSETT projectThe MUSETT project
MUr de Silicium pour l’Etude desTransfermium par Tagging(Silicon Wall for Transfermium Studies using
Tagging)Goals:• Detection of very-heavy/slow ions for RDT• Improved detection for light ions
(transfer, deep inelastic)
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M. Rejmund/Ch. Theisen INTAG June 2005
MUSETT ConfigurationsMUSETT ConfigurationsMusett Musett + SeDRDT
Z,A identification (transfer, deep inelastic)
Musett +CHIO
Musett +CHIO+SeD
40x10cm4x128x128 strips
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M. Rejmund/Ch. Theisen INTAG June 2005
SpecificationsSpecifications
Granularity (Decay tagging, ray tracing) Size (Focal plane coverage) Energy resolution (Alpha spectroscopy,
identification) Window-less (Slow and heavy ions)
Low noise and compact electronics (ASICs) Fast readout
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M. Rejmund/Ch. Theisen INTAG June 2005
MUSETT : Cost and planningMUSETT : Cost and planning
2006 : detector prototype; tests with existing electronics
2007-2008 : full setup (4 det.) with ASICs electronics
Cost : ~220 k€
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M. Rejmund/Ch. Theisen INTAG June 2005
SummarySummary
Dispersive mode : transfer, deep-inelastic SeD, Drift chamber, CHIO, SiWall
Non dispersive : very-heavy elements Asymmetric reactions, SeD, SiWal
Developments : Improved ToF (dispersive Mode) MUSETT : RDT; A,Z,Q identification