Experimental Technique and Equipment

  • 论文详细
Annual Report for China Institute of Atomic Energy 1996年00期

摘要:4.1 A Tritium Gas Target for Neutron Production at HI-13 Tandem Accelerator Qi Bujia Zhou Zuying Zhou Chenwei Tang Hongqing Du Yanfeng Chen Qingwang Li Jimin A tritium gas target has been built and employed in neutron physics experiments at HI-13 tandem accelerator with both DC and pulsed beams. As neutron sources using the T(p,n)3He and T(d,n)4He reactions provide a higher yield for a given energy loss, target backgrounds can be measured and the cell withstands substantial beam currents. Such a target is needed to effectively carry out studies of elastic and inelastic neutron scattering and neutron induced charged particle emission reactions in the energy range up to 40 MeV. The gas target consists of a helium gas cell and a tritium gas cell. There is a flange at one end of the helium gas cell to which the entrance window is attached. Between the tritium gas cell and helium gas cell there is the other window which is similar to the entrance one. The other end of the tritium gas cell is closed. The tritium gas cell is lined by 0.3 mm thick gold plate and 1 mm thick gold disk serves as the beam stop. Gold has been shown to yield low neutron backgrounds when bombarded by charged particle. The tritium cell is 4 cm long and 1.1 cm in diameter. The cell body is fabricated from stainless steel. The cell wall is 0.3 mm thick.The cells in which O-rings and indium O-ring are employed to accomplish entrance-foil attachment. An 80 cm long copper tube with 2.0 mm OD and 1.0 mm ID is silver-soldered into the cell flange to provide the connection with the gas handling system. Cross sectional view of the tritium gas target is shown in the Fig. 1. The gas cell was cooled by water drops. The whole tritium loop was in vacuum and tested by helium