ID09 is an insertion device beamline designed for time-resolved experiments in macromolecular crystallography and liquids.

The unique feature of ID09 is the focused white beam which can be used for time-resolved Laue diffraction on macromolecules and pink beam time-resolved liquid scattering. The exposure time for small proteins is in the micro second range but can reach 100 ps in timing mode operation (4 bunches, 16 bunches, hybrid mode).

In those macromolecular reactions which can be triggered reversibly by a laser pulse, one can construct 100 psec stills of the electron density at a given delay after initiation and produce a film of the reaction with atomic resolution. The relative timing of the laser and x-ray pulse is controlled electronically from ps to second time scale (laser-xray jitter < 5ps).

An high speed chopper is used as fast mechanical shutter to select the flash produced by a single bunch out of the high frequency train of flashes produced by the storage ring.

A double pulse train of exciting laser pulses followed by probing x-ray pulses can thus be produced in which the phase can be varied. A Ti:sapphire femtosecond laser is operational. For those reversible reactions which can run at frequencies up to 1 kHz, this instrument should give 100 ps resolution in monochromatic/polychromatic data collection from macromolecules, time-resolved diffuse scattering. The total exposure time is of course much longer than for the equivalent static experiment. Specifically, extracting a 15 mA single bunch opposite a 150 mA super bunch at 1 kHz reduces the average intensity by about 5000 and bring the monochromatic intensity from the 20 mm period undulator down to ~ 5 x 10^8 ph/sec, which is nevertheless only a factor of 10 lower than the flux from a bending magnet.