Single bunch X-ray pulses on demand from a multi-bunch synchrotron radiation source
2014 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 5, 4010Article in journal (Refereed) Published
Synchrotron radiation facilities routinely operate in a multi-bunch regime, but applications relying on time-of-flight schemes require single bunch operation. Here we show that pulse picking by resonant excitation in a storage ring creates in addition to the multi-bunch operation a distinct and separable single bunch soft X-ray source. It has variable polarization, a photon flux of up to 10(7)-10(9) ph s(-1)/0.1%BW at purity values of 10(4)-10(2) and a repetition rate of 1.25 MHz. The quasi-resonant excitation of incoherent betatron oscillations of electrons allows horizontal pulse separation at variable (also circular) polarization accessible for both, regular 30 ps pulses and ultrashort pulses of 2-3 ps duration. Combined with a new generation of angularly resolving electron spectrometers this creates unique opportunities for time-resolved photoemission studies as confirmed by time-of-flight spectra. Our pulse picking scheme is particularly suited for surface physics at diffraction-limited light sources promising ultimate spectral resolution.
Place, publisher, year, edition, pages
2014. Vol. 5, 4010
Condensed Matter Physics Atom and Molecular Physics and Optics
IdentifiersURN: urn:nbn:se:uu:diva-228559DOI: 10.1038/ncomms5010ISI: 000337542400002OAI: oai:DiVA.org:uu-228559DiVA: diva2:734442
FunderSwedish Research CouncilEU, European Research CouncilCarl Tryggers foundation VINNOVA