Elsevier

Nuclear Instruments and Methods

Volume 86, Issue 2, 15 September 1970, Pages 291-299
Nuclear Instruments and Methods

Production of tagged gammas using a thin internal synchrotron target

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Abstract

The tagging of the energies of individual high-energy gamma rays in a bremsstrahlung beam by measuring the momentum of the recoil electron is now a standard technique. It is normally used in low intensity external electron beams. We describe a tagging system for photons produced in a quartz fiber target placed in the internal beam of the Cambridge Electron Accelerator. Tagging rates achieved were a few megacycles within a gate having a 10 to 15 per cent duty factor. The maximum photon energy tagged is 5 GeV. By using a very small fiber, adequately low tagging rates can be achieved at machine beam intensities of several milliamps. The target may be placed in the beam throughout the acceleration cycle, allowing a substantially improved duty factor and not normally interfering with simultaneous use of the machine for other experiments.

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    This work is supported in part t U.S. Atomic Energy Commission under Contract AT(30-1)-2098.

    Present address: Princeton University, Physics Department, Princeton, New Jersey.

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