STARK (Silicon Telescope Array for Reaction studies in inverse Kinematics)
1. Motivation
- One of the powerful experimental method to study nuclear reactions
- An ejectile reflects the properties of residual nucleus
- Measure energy, angular momentum, cross-section, spectroscopic factor
![In center of mass frame](/img/cens_en/contents/stark_fig01.png)
Schematic overview of the transfer reaction
![ORRUBA (+ GRETINA), ORNL SHARC(+TIGRESS), TRIUMF , T-REX(+Miniball), ISOLDE](/img/cens_en/contents/stark_fig02.png)
Silicon telescope array for reaction studies in the world
2. Detector design
![Beam Target(Solid, Gas)](/img/cens_en/contents/stark_fig03.png)
STARK conceptual design
![STARK design with a cryogenic gas cell chamber](/img/cens_en/contents/stark_fig04.png)
STARK design with a cryogenic gas cell chamber
- Charged particle detection from collision (E,p)
- Barrel type array, 12 + 16 + 12 sided ring
- Φ = 92.5, 118.8, 107 mm, 28.4 mm gap for target
- Δθlab < 1˚ expected with wide coverage (43˚ ~ 78˚, 105˚ ~ 150˚) => Comparable or better than
state-of-the-art detectors
- Newly designed resistive silicon strip detector, X6
- Useful for many rare isotope facilities (ex. RIKEN, FRIB and RAON)
3. Detector specification
![X6 (by Micron),BB10 (by Micron),QQQ5 (by Micron)](/img/cens_en/contents/stark_fig05.png)
![STARK design with a cryogenic gas cell chamber](/img/cens_en/contents/stark_fig06.png)
- Junction side : 8 resistive strips, 5.6 mm pitch (2 read-outs)
- Ohmic side : 4 normal strips
- Active area : 75 × 40.3 mm2 (1 mm thickness)
- Position : (QH – QL) / (QH + QL) ~ 1 mm resolution expected
- Energy : (QH + QL)
4. Detector performance test
![Depletion voltage test](/img/cens_en/contents/stark_fig07.png)
Depletion voltage test
![Resolution test](/img/cens_en/contents/stark_fig08.png)
Resolution test
5. Current status & future plan
- X6 detector is arrived and testing the performance
- Assembly structure was delivered
- Preparing electronics for DAQ system
- Detector and DAQ test on 2022
- System commissioning on 2023
![Geant4 simulation](/img/cens_en/contents/stark_fig09.png)
Geant4 simulation
![STARK assembly](/img/cens_en/contents/stark_fig10.png)
STARK assembly
![Future plan](/img/cens_en/contents/stark_fig11.png)
Future plan