Center for Exotic Nuclear Studies

1. Physics motivation

Study of nucleosynthesis processes to produce heavy elements in the universe such as αp-, r- and rp-process

Schematic overview of the nuclear processes on nuclear chart (H. Schatz, 2016)

2. Goal

Development of a cryogenic gas cell target, CryoSTAR, to be utilized in future experiments at various RI facilities including KoBRA

KoBRA beamline

3. Specification of the CryoSTAR

• Temperature: 40 K
• Pressure: 0.3~2 atm
• Gas: H2, D2, 3He, 4He
• Target thickness: 3, 6 mm
• Window size (diameter): 20 mm
• Window material: Haver, Mo, Ti, Mylar
• Window thickness: 2~50 μm

4. Schematic diagram of the CryoSTAR system

Schematic diagram of the CryoSTAR system

5. Development status

• Operation test of the compressor and chiller for the cryogenic system
• Vacuum test of the vacuum chamber
• Construction of the cryocooler at the vacuum chamber
• Completion of the target cell design

Inner design of the vacuum chamber and target cell design

GM cooler

Vacuum chamber

Compressor and chiller for the cryogenic system

6. Development timeline

Development timeline

	2021		2022
Research plan	Gas cell target system R&D	Cryogenic system order	System completion	Gas cell production	Test experiment
Status	▲(present)