Quantum-mechanical suppression of bremsstrahlung

Conference · Wed Dec 01 04:00:00 EST 1993

OSTI ID:10114904

Becker-Szendy, R ^[1]; Anthony, P ^[1]; Bosted, P ^[2]

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1. Stanford Linear Accelerator Center, Menlo Park, CA (United States)
2. American Univ., Washington, DC (United States); and others

We have studied quantum-mechanical suppression of bremsstrahlung of low-energy 1-500 MeV photons from high-energy 25 GeV electrons. We measured the LPM effect, where multiple scattering of the radiating electron destroys coherence required for the emission of low-energy photons, and the dielectric effect, where the emitted photon traveling in the radiator medium interferes with itself. For the experiment, the collaboration developed a novel method of extracting a parasitic low-intensity high-energy electron beam into the fixed target area during normal SLC operation of the accelerator. The results agree quantitatively with Migdal`s calculation of the LPM effect. Surface effects, for which there is no satisfactory theoretical prediction, are visible at low photon energies. For very thin targets, the suppression disappears, as expected. Preliminary results on dielectric suppression of bremsstrahlung are in qualitative agreement with the expectation.

• Research Organization: Stanford Linear Accelerator Center, Menlo Park, CA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States); National Science Foundation, Washington, DC (United States)
• DOE Contract Number: AC03-76SF00515; W-7405-ENG-48
• OSTI ID: 10114904
• Report Number(s): SLAC-PUB--6400; CONF-930767--1; CONF-9309297--3; ON: DE94005223; CNN: NSF-PHY-9113428; NSF-PHY-9114958
• Country of Publication: United States
• Language: English

Related Subjects

662390
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BREMSSTRAHLUNG
CALIBRATION
CARBON
ELECTROMAGNETIC PROCESSES AND PROPERTIES
MONTE CARLO METHOD
PHOTON-ELECTRON INTERACTIONS
SHOWER COUNTERS
URANIUM