A Tagged Photon Beam at NAL

Journal Article · Tue Jul 13 04:00:00 EDT 1971 · TBD

OSTI ID:2406210

Biggs, P. ^[1]; Busza, Wit ^[1]; Chen, M. ^[1]; Nash, T. ^[2]

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1. MIT, LNS
2. MIT.LNS

We propose the construction of the tagged photon beam shown in Fig. 1.It is expected that up to 200 GeV this beam can produce electron yields,at the tagging target, of greater than $10^8$electrons per pulse of $$10^{13}$$incident protons. The contamination from $$\pi^-$$ would be less than a few partsin 1000. The photon yield depends on the accuracy to which the photonmomentum must be known. For a 0.5% measurement of the photon momentum anda 200 GeV electron beam, for example, one can anticipate about 3.7 x $10^5$photons per pulse in the range 122 GeV to 195 GeV. The beam may be used athigher energies but yields fall below the ones just cited.With the lead radiator in place and the tagging target removed, onehas an,.electron beam, useful up to about 300 GeV with a momentum acceptanceof $$\pm$$ ~4% and resolution of $$\pm$$ ~0.5% if counter hodoscopes are used to measurethe electron momentum.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
• Contributing Organization: Canadian - MIT
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 2406210
• Report Number(s): FERMILAB-PUB-71-094-E; oai:inspirehep.net:2810325
• Journal Information: TBD, Journal Name: TBD
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS