CNS active target (CAT) for missing mass spectroscopy with intense beams.

Area of Science:

• Nuclear Physics
• Particle Detectors
• Experimental Physics

Background:

• Active targets are crucial for studying nuclear reactions.
• Time projection chambers (TPCs) offer 3D tracking capabilities.
• Detecting both beam and recoil particles simultaneously is challenging, especially at high beam intensities.

Purpose of the Study:

• To introduce a new gaseous active target detector named CAT.
• To present a novel dual gain THGEM (Thick Gas Electron Multiplier) technology.
• To enable simultaneous detection of beam and recoil particles with a wide dynamic range.

Main Methods:

• Development of a gaseous active target based on a time projection chamber (TPC).
• Implementation of a dual gain THGEM structure.
• Measurement of effective gain in low and high gain regions.

Main Results:

• The CAT detector effectively reduces gain for beam particles while maintaining high gain for recoil particles.
• The measured effective gain in the low gain region was 100 times smaller than in the high gain region.
• The detector demonstrated a wide dynamic range, capable of handling beam intensities > 10^5 Hz.

Conclusions:

• The dual gain THGEM technology in the CAT detector significantly enhances its dynamic range.
• This advancement allows for simultaneous detection of beam and recoil particles in high-intensity experiments.
• The CAT detector is a promising tool for future nuclear physics research.