Journal
PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS
Volume 15, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevSTAB.15.021302
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Funding
- U.S. NRC [38-09-953]
- FCT (Portugal)
- EPSRC [EP/H00601X/1, EP/I014462/1] Funding Source: UKRI
- STFC [ST/J002062/1] Funding Source: UKRI
- Direct For Mathematical & Physical Scien
- Division Of Physics [934694] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Physics [1054164] Funding Source: National Science Foundation
- Engineering and Physical Sciences Research Council [EP/I014462/1, EP/H00601X/1] Funding Source: researchfish
- Science and Technology Facilities Council [ST/J002062/1] Funding Source: researchfish
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We propose and use a technique to measure the transverse emittance of a laser-wakefield accelerated beam of relativistic electrons. The technique is based on the simultaneous measurements of the electron beam divergence given by v(perpendicular to)/v(parallel to), the measured spectrum gamma, and the transverse electron bunch size in the bubble r(perpendicular to). The latter is obtained via the measurement of the source size of the x rays emitted by the accelerating electron bunch in the bubble. We measure a normalized rms beam transverse emittance < 0.5 pi mm mrad as an upper limit for a spatially Gaussian, spectrally quasimonoenergetic electron beam with 230 MeV energy in agreement with numerical modeling and analytic theory in the bubble regime.
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