Equipments for momentum cooling at TARN

This paper is dedicated to design and prepare the experimental equipment for momentum cooling at TARN (Test Accumulation Ring for Numatron, attached to the SF cyclotron at the Institute for Nuclear Study, University of Tokyo). Stochastic cooling has been the subject of many theoretical and experimental works, and recently this method has been applied to accumulate anti-protons. The application of this method to the beam stacked in TARN was planned, and the equipment for longitudinal momentum cooling with a filter has been set up. In the paper, the authors first review momentum cooling theory. Next, the beam pick-up, the kicker and the notch filter are described. Coupling impedance and total gain, and the parameters and performance of the travelling wave helix are discussed. As for the notch filter, a coaxial cable and the resistor dependence are investigated. The effect of notch gain shape on the beam distribution is discussed. The revolution frequency of the particles is 1.1 MHz, and the revolution time is 0.88 μs. The consideration for the network is briefly reported. The data taking system such as a spectrum analyzer and a computer is also described. (Wakatsuki, Y.)