Generation of Short X-Ray Pulses Using Crab Cavities at the Advanced Photon Source

Utilization of transverse deflecting RF cavities in the designed QBA lattice of 3 GeV Taiwan Photon Source

“…This type of lattice has some advantages over the double-bend achromat or the double-bend nonachromat by providing a small natural beam emittance and some zero dispersive straight sections. Exploiting these advantages helped us employ the transverse RF deflectors [12]- [18] in our simulation to produce sub-picosecond photon pulses. Similar to the work performed at Advanced Photon Source (APS) [15] by simulating the deflecting RF cavities in their DBA cells, we have studied the detailed simulation and analysis of X-ray compression using the transverse deflecting RF cavities in our designed QBA lattices of the TPS.…”

“…This type of lattice has some 2010 JINST 5 T01001 advantages over the double-bend achromat or the double-bend nonachromat by providing a small natural beam emittance and some zero dispersive straight sections. Exploiting these advantages helped us employ the transverse RF deflectors [12][13][14][15][16][17][18] in our simulation to produce sub-picosecond photon pulses.…”

Photochemical Processes Revealed by X-ray Transient Absorption Spectroscopy

“…116,117 Studies in synchrotron XTA experiments recently have achieved higher time resolution by using slicing sources, 28,118 detecting signals with an X-ray streak camera, 119 and a proposed short X-ray pulse crab cavity scheme. 120 These approaches in one way or another significantly enhance the time resolution of the transient spectra but yield much lower X-ray pulse photon flux, which would prolong the data acquisition time and lower the data quality, although some of these setbacks could be mediated using high-repetition-rate lasers. 22,31 The most exciting prospect for fs XTA comes from the hard X-ray free-electron laser sources, such as the LCLS in the Stanford Linear Accelerator Laboratory (SLAC) where X-ray pulses of 70 fs (fwhm) or shorter are routinely produced with 10 12 photons/pulse at 120 Hz with energy ranges from soft to hard X-ray regions in different experimental stations.…”

“…Time Resolution and Single Bunch X-ray Photon Flux. The aforementioned examples, on one hand, demonstrate the advances in the XTA capability of solving transient structures at synchrotron sources for those structures lasting for >80 ps, which increasingly contributes to our understanding of chemical processes; on the other hand, these examples also indicate the needs for better time resolution to interrogate short-lived transient structures, such as unrelaxed upper excited states, ligand dissociation intermediates, excited charge-transfer states, oscillations in electronic/nuclear coherence, as well as transition states at/near conical intersections. , Studies in synchrotron XTA experiments recently have achieved higher time resolution by using slicing sources, , detecting signals with an X-ray streak camera, and a proposed short X-ray pulse crab cavity scheme . These approaches in one way or another significantly enhance the time resolution of the transient spectra but yield much lower X-ray pulse photon flux, which would prolong the data acquisition time and lower the data quality, although some of these setbacks could be mediated using high-repetition-rate lasers. , …”

Generation of Picosecond X-Ray Pulses in the ALS Using RF Orbit Deflection

“…In addition other laboratories are interested in providing a source of high repetition rate light pulses with a picosecond time duration. At the 2005 Users' Meeting for the Advanced Photon Source (APS) and the Center for Nanoscale Materials in May 2005, there was a workshop entitled "Generation and Use of Short X-ray Pulses at APS and there several papers being presented at this meeting [2,3,4].…”