Superconducting UCN Polarizer for a New EDM Spectrometer
A test experiment has shown that the number of ultracold neutrons (UCN) of one polarization state, transmitted through a 100 μm Al foil when placed in a 5 T magnetic field, is greater by 3.8 times. The increased transmission is due to the higher velocity of the UCN passing through the foil.
ICANS-XVIII 18 th Meeting of the International Collaboration on Advanced Neutron Sources
A new type of ultracold neutron (UCN) source based on the spallation process is under construction at PSI. The essential elements of this source are a pulsed 590 MeV proton beam with an intensity of about 2 mA delivered from the ring cyclotron, a spallation target, a heavy water moderator and a converter system consisting of about 30 liters of solid Deuterium at low temperature (6 K) for the production of ultracold neutrons. Spallation neutrons are thermalized in the D2O, cooled and further downscattered in the solid deuterium to ultracold energies (E < 300 neV). The source is expected to deliver densities of over 1000 UCN per cubic centimeter into two experimental areas. The progress of the development and construction of all essential components of the source is reported.
DESIGN CONSIDERATION TO PPM KLYSTRONS FOR INDUSTRIAL LINAC
Toshiba has been developing the C-band and X-band Periodic Permanent Magnet (PPM) focused klystron in collaboration with KEK and manufactured prototypes for the JLC project. [1] The PPM klystron has an advantage to enhance the total efficiency as a result of eliminating the electric power for the focusing magnet. From experience on the development the PPM focused klystrons for the JLC project, we plan to apply the PPM focused klystron to the medical and industrial linac. The periodic magnet focusing scheme has some technical difficulties such as stop band voltage. To design the PPM klystron for the medical and industrial linac, it is necessary to give heed to electron beam instability; so that the tube parameters of the PPM focused klystrons have some constraints. The size of the accelerator system is substantially reduced if a PPM focused klystron is used. The majority of medical and industrial linacs use frequencies of S-band range. We discuss the availability of the S-band PPM focused klystron in this paper.