Radiation from relativistic electron beams in periodic structures
Conference
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OSTI ID:238853
- Brookhaven National Lab., Upton, NY (United States); and others
We present an experimental study of emission of radiation from relativistic electrons in a novel periodic structure. The MIT microwiggler is a pulsed ferromagnetic-core electromagnet consisting of 70 periods of 8.8 mm periodicity, generating an on-axis peak magnetic field of 4.2 kG. Each field pea in independently tunable. We employed a novel tuning scheme to reduce the RMS spread in the peak amplitudes to 0.08%, the lowest ever attained in a sub-cm magnetic field. A high brightness, 40 MeV pulsed electron beam produced by the LINAC at the Accelerator Test Facility at Brookhaven National Laboratory was injected into the short period wiggler and visible spontaneous emission was produced. Spectral density profiles were measured and the measured peak wavelength was shown to vary appropriately with beam energy. It is shown that the principal spectral broadening mechanisms are longitudinal energy spread in the electron beam and off-axis emission. Further work is planned at 50 MeV.
- Research Organization:
- Brookhaven National Lab., Upton, NY (United States)
- OSTI ID:
- 238853
- Report Number(s):
- BNL--61982-Absts.; CONF-9508156--Absts.; ON: DE96002729
- Country of Publication:
- United States
- Language:
- English
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