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