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Enhancing RIB Experiments: The ACTAR Active Target Detector at HIE-ISOLDE

The ACTAR active target detector, housed in a time-projection chamber, is designed for high-energy research with radioactive isotope beams (RIBs). Utilizing detection gas as the target in a thick configuration, it boasts high efficiency, excellent tracking, and spatial resolution with low thresholds, making it ideal for studies with the faintest RIBs. This paper discusses the challenges faced during beam experiments at REX-ISOLDE, such as contamination and correlation issues, suggesting improvements for efficient operation, including electronic updates and beam management strategies.

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Enhancing RIB Experiments: The ACTAR Active Target Detector at HIE-ISOLDE

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  1. ACTAR @ HIE-ISOLDEExperimental requirements RiccardoRaabe Instituutvoor Kern- en Stralingsfysica, K.U.Leuven

  2. The active target detector Time-projection chamberwith detection gas as target Thick targetHigh efficiencyTracking, identificationSpatial resolutionLow thresholds Well-adapted for usewith the weakest RIBs

  3. 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

  4. 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 learnt ACTAR at HIE-ISOLDE will work!

  5. Beam requirements Instantaneous rate is a limit Creation of ionisation charges Count rate Actual limit ≈105-106pps inst.  < 103pps • Spread the beam pulses as much as possible • Keep contaminationto a minimum • Divergence < 10 mrad • E resolution <1% • AstrophysicsEnergy < 0.7 MeV/nucleon

  6. Setup and footprint In combination with the solenoid?

  7. Setup and footprint Stand-alone

  8. Setup and footprint Stand-alone

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