photon

Paper	Title	Other Keywords	Page
PLT03	Energy Recovery Linac Experimental Challenges	linac, emittance, undulator, optics	7
	D. H. Bilderback Cornell University, Department of Physics, Ithaca, New York
	ERL projects are ongoing at Jlab, Daresbury, KEK and Cornell. Here we describe the typical experimental concerns of using high-coherence and ultra-fast pulses from the Cornell ERL as an example of a new opportunities. The hi-flux mode is one where the ERL runs at 5 GeV and 100 mA. Many experiments are photon-starved, such as inelastic X-ray scattering. The high-coherence mode is obtained at 25 mA and the transverse emittances could be as low as 8 pm. The beam size will be at its smallest under this operating condition and average spectral brightness as high as 1023 (standard units) are calculated. (WG2 will discuss the ERL accelerator issues.) We expect to produce a 3 micron round emitting source for imaging and coherence experiments on individual biological cells. The ultra-fast mode is one obtained by reducing the repetition rate to 1 MHz and by increasing the bunch charge to 1 nC per pulse and compressing the natural 2 ps bunch length to less than 100 fs. We will present science opportunities for X-ray experiments on a single atom as well as the challenges in optics, other experiments, and beam control issues when making a 1 nm focused X-ray beam size.
	Slides
PLT31	Summary of WG1 – Storage Ring Based Radiation Sources	storage-ring, emittance, radiation, lattice	18
	K. C. Harkay ANL, Argonne, Illinois A. Ropert ESRF, Grenoble
	Summary of the Storage Ring Based Radiation Sources working group The proposed topics of discussion in the Storage Ring Radiation Sources Working Group are presented. The questions addressed to the participants are the following: What ring parameters may lead to new science? Can we go beyond the present state of the art sources? What critical accelerator technologies require development? Upgrade of existing sources: What is feasible? Is it worth building cost-effective but lower performing rings? Should we build multipurpose or specialised sources?
	Slides
WG101	Beam Physics Issues in CANDLE Synchrotron Light Source Project	ion, impedance, storage-ring, brightness	21
	V. M. Tsakanov, M. Ivanyan, Y. L. Martirosyan CANDLE, Yerevan
	CANDLE (Center for the Advancement of Natural Discoveries using Light Emission) is a 3 GeV synchrotron light source project in Republic of Armenia. The summary of the facility beam physics study will be given, including the optimal beta performance in insertion devices, the machine impedances, instabilities cures, beam lifetime, non-linear and fringe field effects evaluation.
	Slides
WG112	Proposal of a Synchrotron Radiation Facility to Supply Ultraviolet Light, X-Ray, MeV-photon, GeV-photon and Neutron	laser, synchrotron, electron, radiation	24
	Y. Kawashima JASRI/SPring-8, Hyogo-ken
	This is a proposal of new facility, which consists of 1 GeV-linac, booster synchrotron and storage ring. The synchrotron accelerates electron beam from 1 GeV to 10 GeV. The storage ring stores the beam at arbitrary energy from 1 GeV to 10 GeV and top-up operation is carried out at any stored beam energy. The stored beam current depends on the beam energy. In the energy region of 8 GeV to 10 GeV, maximum beam current is around 100mA. Under the energy of 4 GeV, the targeted maximum current is 1 A. The storage ring supplies ultraviolet light, MeV-photon, GeV-photon and neutron for solid-state physics, biology, protein structure analysis, drug development and particle physics. The main feature of the facility is to be able to supply the monoenergetic MeV-photon and neutron. With CO2 laser and stored electron beam, monoenergetic MeV-photons are produced through the inverse Compton process. To obtain the target monoenergetic MeV-photon, the wavelength of the laser is constant; on the other hand stored beam energy is changed. Using a superconducting wiggler, a lot of MeV photons are radiated from the wiggler. With the radiated MeV-photon and beryllium target, neutrons are produced.
WG333	High Harmonic Seeding and the 4GLS XUV-FEL	laser, optics, electron, controls	36
	B. Sheehy Sheehy Scientific Consulting, Wading River, New York J. A. Clarke, D. J. Dunning, N. Thompson CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire B. W.J. McNeil USTRAT/SUPA, Glasgow
	The Fourth Generation Light Source (4GLS) project, proposed by the CCLRC in the U. K., will include free electron lasers in the XUV, VUV, and IR. It is proposed that the XUV-FEL, operating between 8–100 eV, be seeded by a high harmonic (HH) source, driven by an ultrafast laser system. This offers advantages in longitudinal coherence, synchronization, and the potential for chirped pulse amplification and pulse shaping. In this talk we discuss the issues of HH generation relevant to its use as a seed (energy, spectrum, tunability, synchronization and time structure) and the current planned implementation in the 4GLS XUV-FEL.
	Slides
WG517	X-ray Pulse Length Characterization Using the Surface Magneto Optic Kerr Effect	laser, polarization, electron, radiation	51
	P. Krejcik SLAC, Menlo Park, California
	It will be challenging to measure the temporal profile of the hard X-ray SASE beam independently from the electron beam in the LCLS and other 4th generation light sources. A fast interaction mechanism is needed that can be probed by an ultra-fast laser pulse in a pump-probe experiment. It is proposed to exploit the rotation in polarization of light reflected from a thin magnetized film, known as the surface magneto optic Kerr effect (SMOKE), to witness the absorption of the X-ray pulse in the thin film. The change in spin orbit coupling induced by the X-ray pulse occurs on the sub-femtosecond time scale and changes the polarization of the probe beam. The limitation to the technique lies with the bandwidth of the probe laser pulse and how short the optical pulse can be made. The SMOKE mechanism will be described and the choices of materials for use with 1.5 Å X-rays. A schematic description of the pump-probe geometry for X-ray diagnosis is also described.
	Slides