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MUSETT: the segmented Si array for the focal plane of the VAMOS spectrometer. Ch. THEISEN – CEA Saclay Christophe.theisen@cea.fr. What is MUSETT. MU r de S ilicium pour l’ E tude des T ransfermium par T agging Collaboration Saclay - Ganil - PowerPoint PPT Presentation
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- Christophe THEISEN - INTAG Workshop GSICEA DSM Dapnia SPhNMay 25th, 2007 1
MUSETT: the segmented Si array for the focal plane of theVAMOS spectrometer
Ch. THEISEN – CEA Saclay
Christophe.theisen@cea.fr
- Christophe THEISEN - INTAG Workshop GSICEA DSM Dapnia SPhNMay 25th, 2007 2
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
- Christophe THEISEN - INTAG Workshop GSICEA DSM Dapnia SPhNMay 25th, 2007 3
MUSETT at VAMOS + EXOGAM
- Christophe THEISEN - INTAG Workshop GSICEA DSM Dapnia SPhNMay 25th, 2007 4
VAMOS optics
Wien Filter tuned on residues; dipole on
Wien Filter tuned on beam; dipole off
Beam dispersion background
Beam focused
Optics optimized on residues in both cases
- Christophe THEISEN - INTAG Workshop GSICEA DSM Dapnia SPhNMay 25th, 2007 5
VAMOS optics
Beam
1+ 5+ 10+
Beam
WF tuned on recoils WF tuned on beam
- Christophe THEISEN - INTAG Workshop GSICEA DSM Dapnia SPhNMay 25th, 2007 6
Si detectors
(Not a MUST II detector, this is a MUSETT one…)
- Christophe THEISEN - INTAG Workshop GSICEA DSM Dapnia SPhNMay 25th, 2007 7
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
- Christophe THEISEN - INTAG Workshop GSICEA DSM Dapnia SPhNMay 25th, 2007 8
Si detectors
- Christophe THEISEN - INTAG Workshop GSICEA DSM Dapnia SPhNMay 25th, 2007 9
Si detectors mechanics
- Christophe THEISEN - INTAG Workshop GSICEA DSM Dapnia SPhNMay 25th, 2007 10
Electronics and DAQ for Si detectors
•See next presentation…
ATHED
CVM
MUVI
- Christophe THEISEN - INTAG Workshop GSICEA DSM Dapnia SPhNMay 25th, 2007 11
Gas detectors
Bi 150MeV55 MeV
D DSSD
Elect
16 MeV
Elect
57 MeV
α
IC
Elect
5-10 Torr Iso
Energy loss
Escaped radioactivity
- Christophe THEISEN - INTAG Workshop GSICEA DSM Dapnia SPhNMay 25th, 2007 12
Gas detector
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
- Christophe THEISEN - INTAG Workshop GSICEA DSM Dapnia SPhNMay 25th, 2007 13
Mechanics integration
•Integration in the HARPEE mechanics : easy installation / maintenance
– Si Wall module
– Gas detector module
- Christophe THEISEN - INTAG Workshop GSICEA DSM Dapnia SPhNMay 25th, 2007 14
Status
•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
- Christophe THEISEN - INTAG Workshop GSICEA DSM Dapnia SPhNMay 25th, 2007 15
Perspectives
S3 focal plane
SPIRAL2
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