counter is contained in a vacuum-tight pulse every three seconds. The devices. A superconducting 'wiggler' stainless steel vessel wrapped with probable subsequent addition of a fast will be installed to raise the peak to many layers of super-insulation. Since cycling booster could later take the in 1017 photons at a smaller wavelength argon-ethane was used for the gas, the tensity to over 1013. 0.38 A. temperature of the IPF is regularly Contacts with industry are being Six channels will be provided for ex monitored to keep it at room made to produce the prototype of the periments. Outside KEK, there is a temperature with a small heater. first 10 MeV tank of the nine tank linac mighty Users' Association which has Last winter the test IPF operated for which will operate at about 200 MHz. grown from the Users' Group at INS- three months during a neutrino bubble The option of negative hydrogen ion in SOR (the 300 MeV storage ring at the chamber experiment and preliminary jection to increase intensity is being Institute for Nuclear Study, University analyses have revealed promising per kept open. of Tokyo) in the past fifteen years and formance. The detection efficiency of A site near Peking is being in now consists of 360 members. the counters was about 80% per track vestigated and the aim is to have the The project head is K. Kohra who and the probability of a neutrino in accelerator constructed during the has been in charge of the Users' As duced interaction hitting at least one next five years. sociation and has been the most counter was as high as 65%, even earnest promoter of the project. Head though the area covered by the test of the linac construction is J. Tanaka, version is only 25% of the down who has been the head of the proton stream region (roughly 2 m x 2.5 m) of linac group of the KEK proton syn the bubble chamber. KEK chrotron, and the head of the storage Encouraged by these results, Fer Photon Factory ring construction is K. Huke, who has milab plans to install a larger scale IPF moved from being head of 1.3 GeV in the summer with much less dead The construction of a 'Photon Factory' electron synchrotron group at the In space. for synchrotron radiation research has stitute for Nuclear Study in Tokyo. At been approved in the budget for Fiscal present there are only a few people on Year 1978 in Japan. Originally it was the staff of this new project and staff PEKING planned to be an independent institu from the PS are therefore collaborating tion but it was finally established as a with them in the machine construc Design of part of the KEK Laboratory where the tion. The total number of staff is ex proton synchrotron 12 GeV proton synchrotron is in opera pected to increase to about 160 in four tion. Construction will be completed in years. The Institute of High Energy Physics at four years at a total cost of about $70 Peking is developing the design of a 30 million of which $33 million is for the to 50 GeV proton synchrotron. It is felt accelerator complex and experimental that such a machine is within the pres facilities and $37 million for buildings, BROOKHAVEN ent capacity of Chinese industry and including the electric power station one of the aims in the decision to build and the water cooling plant. Light source a particle accelerator, in addition to the The accelerator consists of a 2.5 takes shape desire to enter the field of high energy GeV electron linac (total length 400 m) physics research as soon as possible, is and an electron storage ring (diameter Both storage rings of the National to stimulate Chinese industry. The ac 50 m). The design performance is for Synchrotron Light Source, NSLS, celerator design has in mind the pos an electron beam intensity of 50 mA which is to be built at Brookhaven are sibility of it being used in the injection from the linac at a repetition rate of now at an advanced stage of design system of a multihundred GeV 50 Hz. The storage ring has an electron and all major parameters have been machine, or a colliding beam machine, beam intensity of 500 mA. The fixed. The NSLS, which has construc at a later date. magnetic field is 1 T and the life of the tion funds of $ 24 million, involves two The preliminary design has a 200 electron beam is about ten hours. electron storage rings to provide in MeV linac feeding a synchrotron about The energy spectrum of the syn tense fluxes of synchrotron radiation 460 m in diameter with peak magnetic chrotron radiation reaches a maximum for research in the X-ray and vacuum field around 1.6 T. The anticipated in intensity of 1016 photons per second ultraviolet regions. tensity is about 5 x 1012 protons per per angstrom at the wavelength of The present aim is to bring the VUV pulse at a repetition rate of about one about 2.3 A without any specific ring into operation in 1980 with eight-
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