The large storage ring, intended for proton-antiproton physics, will initially be used for electron-positron physics, beginning with energies up to 5 GeV. It is now known as VEPP 4. The first magnets are being installed. All the magnet cores are machined and many are assembled ready to be put in the ring. The vacuum chamber is sched­uled to be complete next spring. Beams for VEPP 4 will come from VEPP 3 and, obviously, the positron problem will be important here also.

The proton-antiproton storage ring, VAPP, has been postponed for the future. In the meantime a special ring known as NAP-M is being built spe­cifically for the study of electron

cooling. Experiments are scheduled to start in Spring 1973. The proton-anti­proton scheme would then involve a version of NAP to 'cool' antiprotons of 2 GeV. The storage ring group hopes to demonstrate that they can store at least 106 antiprotons since this would be essential for physics experiments, corresponding to a luminosity of 10 2 6

per cm 2 per s.

BATAVIA Recent news Two items of news from the National Accelerator Laboratory : On 9 October multi-pulse injection from the 8 GeV

Booster into the main ring of the accelerator was tried successfully. Up to now only one Booster pulse per accelerator cycle has been used. Six pulses were fed in per cycle and the beam intensity at 200 GeV consistently reached 10 1 1 during the first tests.

On 10 October cooldown of the magnet for the 15 foot bubble cham­ber reached superconducting tempe­ratures and the full design field of 3 T was achieved in the large chamber volume. Full commissioning of the chamber has been delayed by pro­blems with the piston which are now receiving attention.

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