ACTAR HIEISOLDE Experimental requirements Riccardo Raabe Instituut voor

ACTAR @ HIE-ISOLDE Experimental 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 chamber with detection gas as target Thick target High efficiency Tracking, identification Spatial resolution Low thresholds Well-adapted for use with the weakest RIBs Riccardo Raabe – IKS, KU Leuven HIE-ISOLDE Physics Coordination Group Meeting – September 3, 2012

The active target detector Time-projection chamber with detection gas as target Thick target High efficiency Tracking, identification Spatial resolution Low thresholds Well-adapted for use with the weakest RIBs Riccardo Raabe – IKS, KU Leuven Beam HIE-ISOLDE Physics Coordination Group Meeting – September 3, 2012

Experience with Maya@REX-ISOLDE (IS 520) Problems encountered Beam contamination (12 C in 12 Be beam) → Possibilities at HIE-ISOLDE: degraders, separators High instantaneous rate and correlation between particles → Faster electronics to count beam → Reduce beam signal (mask) → Focus on off-beam tracks Lots of lessons learnt ACTAR 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 contamination to a minimum • Divergence < 10 mrad Riccardo Raabe – IKS, KU Leuven • E resolution <1% • Astrophysics Energy < 0. 7 Me. V/nucleon 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 Riccardo Raabe – IKS, KU Leuven HIE-ISOLDE Physics Coordination Group Meeting – September 3, 2012