Riccardo Raabe – IKS, KU Leuven HIE-ISOLDE Physics Coordination Group Meeting – September 3, 2012
ACTAR @ HIE-ISOLDEExperimental requirements
Riccardo Raabe
Instituut voor Kern- en Stralingsfysica, K.U.Leuven
Riccardo Raabe – IKS, KU Leuven HIE-ISOLDE Physics Coordination Group Meeting – September 3, 2012
The active target detector
Time-projection chamberwith detection gas as target
Thick targetHigh efficiencyTracking, identificationSpatial resolutionLow thresholds
Well-adapted for usewith the weakest RIBs
Riccardo Raabe – IKS, KU Leuven HIE-ISOLDE Physics Coordination Group Meeting – September 3, 2012
The active target detector
Time-projection chamberwith detection gas as target
Thick targetHigh efficiencyTracking, identificationSpatial resolutionLow thresholds
Well-adapted for usewith the weakest RIBs
Beam
Riccardo Raabe – IKS, KU Leuven HIE-ISOLDE Physics Coordination Group Meeting – September 3, 2012
Experience with Maya@REX-ISOLDE (IS520)
Problems encountered
Beam contamination (12C in 12Be beam)→ Possibilities at HIE-ISOLDE: degraders, separators
High instantaneous rateand correlation between particles→ Faster electronics to count beam→ Reduce beam signal (mask)→ Focus on off-beam tracks
Lots of lessons learntACTAR at HIE-ISOLDE will work!
Riccardo Raabe – IKS, KU Leuven HIE-ISOLDE Physics Coordination Group Meeting – September 3, 2012
Beam requirements
Instantaneous rate is a limit
Creation of ionisation charges
Count rate
Actual limit ≈105-106 pps inst.
< 103 pps
• Spread the beam pulses as much as possible
• Keep contaminationto a minimum
• Divergence < 10 mrad
• E resolution <1%
• AstrophysicsEnergy < 0.7 MeV/nucleon
Riccardo Raabe – IKS, KU Leuven HIE-ISOLDE Physics Coordination Group Meeting – September 3, 2012
Setup and footprint
In combination with the solenoid?
Riccardo Raabe – IKS, KU Leuven HIE-ISOLDE Physics Coordination Group Meeting – September 3, 2012
Setup and footprint
Stand-alone
Riccardo Raabe – IKS, KU Leuven HIE-ISOLDE Physics Coordination Group Meeting – September 3, 2012
Setup and footprint
Stand-alone
