Transcript Front-end and VME / VXI readout electronics for ASICs

MUSETT: the segmented Si array
for the focal plane of the
VAMOS spectrometer
Ch. THEISEN – CEA Saclay
[email protected]
May 25th, 2007
CEA DSM Dapnia SPhN - Christophe THEISEN - INTAG Workshop GSI
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What is MUSETT
• MUr de Silicium pour l’Etude des Transfermium par Tagging
• Collaboration Saclay - Ganil
• Spectroscopy of heavy element with VAMOS and EXOGAM using the RDT technique
Motivations :
• VAMOS : well adapted to asymmetric reactions
– Large angular acceptance
– Large transmission
– Beam rejection with the Wien Filter
• EXOGAM : high efficiency (single and coincidences).
Constrains:
– Very slow and very heavy ions
– Optics of Vamos
– Alpha particle spectroscopy
– Segmentation for the RDT technique
– Time stamping
– Option : energy loss and tracking of heavy ions
May 25th, 2007
CEA DSM Dapnia SPhN - Christophe THEISEN - INTAG Workshop GSI
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MUSETT at VAMOS + EXOGAM
May 25th, 2007
CEA DSM Dapnia SPhN - Christophe THEISEN - INTAG Workshop GSI
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VAMOS optics
Wien Filter tuned on residues; dipole on
Beam dispersion  background
Wien Filter tuned on beam; dipole off
Beam focused
Optics optimized on residues in both cases
May 25th, 2007
CEA DSM Dapnia SPhN - Christophe THEISEN - INTAG Workshop GSI
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VAMOS optics
WF tuned on recoils
Beam
WF tuned on beam
Beam
1+ 5+ 10+
May 25th, 2007
CEA DSM Dapnia SPhN - Christophe THEISEN - INTAG Workshop GSI
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Si detectors
(Not a MUST II detector, this is a MUSETT one…)
May 25th, 2007
CEA DSM Dapnia SPhN - Christophe THEISEN - INTAG Workshop GSI
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Si detectors
• Characteristics
– 300 μm thick
– 10 x 10 cm2
– 128 + 128 strips
– 3 % Al grid
– Front side : No Aluminum layer. < 0.25 μm B implantation
– Depletion ~ 30 V. Nominal voltage ~ 60 V.
– Provided by Micron Semiconductor
– 2 evaluation detector + 1 prototype received
May 25th, 2007
CEA DSM Dapnia SPhN - Christophe THEISEN - INTAG Workshop GSI
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Si detectors
May 25th, 2007
CEA DSM Dapnia SPhN - Christophe THEISEN - INTAG Workshop GSI
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Si detectors mechanics
May 25th, 2007
CEA DSM Dapnia SPhN - Christophe THEISEN - INTAG Workshop GSI
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Electronics and DAQ for Si detectors
• See next presentation…
ATHED
MUVI
CVM
May 25th, 2007
CEA DSM Dapnia SPhN - Christophe THEISEN - INTAG Workshop GSI
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Gas detectors
Energy loss
IC
D
DSSD
5-10 Torr Iso
16 MeV
57 MeV
Bi 150MeV
55 MeV
α
Elect
Elect
Elect
Escaped radioactivity
May 25th, 2007
CEA DSM Dapnia SPhN - Christophe THEISEN - INTAG Workshop GSI
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Gas detector
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May 25th, 2007
Constrains
Large dynamics : heavy ions + escaped radioactivity
– Hybrid detector Ionisation Chamber + Drift Chamber
Small energy loss of heavy ions
– Low pressure
Small effect on/off Si Wall
Coexistence of IC/DC fields
Integration in HARPEE mechanics
CEA DSM Dapnia SPhN - Christophe THEISEN - INTAG Workshop GSI
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Mechanics integration
• Integration in the HARPEE mechanics : easy installation / maintenance
– Si Wall module
– Gas detector module
May 25th, 2007
CEA DSM Dapnia SPhN - Christophe THEISEN - INTAG Workshop GSI
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Status
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May 25th, 2007
3 Si detectors received
ATHED ASICs : ready
COFEE Front-end being tested
CVM VME readout and DAQ ready. Need to be tested with COFEE.
MUVI VXI readout : prototypes OK. Production soon
Mechanics for Si : drawing ready, prototype soon
Gas detector : R & D phase. Prototype 2007
CEA DSM Dapnia SPhN - Christophe THEISEN - INTAG Workshop GSI
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Perspectives
SPIRAL2
S3 focal plane
May 25th, 2007
CEA DSM Dapnia SPhN - Christophe THEISEN - INTAG Workshop GSI
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