A Multi-Purpose end-station for Electron- and Ion-Spectroscopy, Pump-Probe, and Imaging Experiments

Layout of the BL1 frontend including the Spilt-and-Delay unit DESC, the Kirkpatrick-Baez (KB) focusing optics, and the CAMP end-station.

BL1 beamline transmission for two different sets of coatings on the transport mirrors. The KB focusing optics are Nickel coated and under 3° grazing incidence.

The CAMP instrument is a permanently installed end-station at BL1 FLASH1 that is available to FLASH users. Its modular and flexible layout allows using many combinations of large-area, single-photon counting pnCCD photon-detectors with VMI- and COLTRIMS-type electron and ion spectrometers, various gas jets and particle injectors (available through collaborations), as well as dedicated laser incoupling optics and diagnostics for the FLASH pump-probe laser. A pair of nickel-coated KB mirrors allows focusing the FEL radiation over the entire wavelength range available at FLASH1 to a spot size of 6µm x 8µm (hor/ver).

pnCCD detectors: CAMP is equipped with two large-area (78 x 74 mm²), single-photon counting 1 Megapixel pnCCD detectors (75 x 75 µm² pixel size), which collect scattered and fluorescent photons with high quantum efficiency and an energy resolution of 40 to 200 eV between <100 eV and 25 keV at a frame read-out rate up to 200 Hz. A variable-sized gap/hole in the center of the first CCD allows the direct FEL beam (and a high-power pump-probe laser, if applicable) to pass through the detector, while the small-angle scattering signal within the area of the hole can be detected on the second CCD, which has a fixed-diameter hole for the direct FEL beam. Both pnCCD detectors can be removed individually if they are not needed in order to provide more flexibility inside the chamber as well as higher vacuum (typical base pressure ~10-7 mbar with pnCCDs installed, up to 10-10 mbar (after bake-out) without pnCCDs).

Electron and ion spectrometers: A suite of double-sided electron and ion imaging spectrometers (time-of-flight, velocity map imaging (VMI), and COLTRIMS/‘reaction microscope’ spectrometers) are available to detect ions and/or electrons of up to a few hundred eV kinetic energy within the full 4pi solid angle, while its conical electrodes provide an unrestricted line-of-sight from the interaction region to the pnCCD detectors. The spectrometers use 80mm MCP detectors that can be operated with delay-line anodes for coincident, momentum-resolved single particle detection or with MCP/phosphor screen detectors that are read-out at 10 Hz by CCD cameras.

Gas jets and particle injectors: A variety of (supersonic) gas and cluster-jets, liquid and droplet-jets, aerodynamic lenses as well as fixed-target holders have been developed and adapted to fit the CAMP chamber. A supersonic gas jet is available for CAMP users upon request (non-corrosive gases only), other jets and injector systems as well as fixed target holders have to be provided by the user or brought in through collaborations.

If you envision an experiment in the CAMP chamber and, in particular, plan to use any of the equipment described below, it is mandatory to contact the CAMP team PRIOR TO SUBMISSION of your proposal in order to discuss all suitable/available options for your experiment.
Experiments inside the CAMP chamber have to be conducted at UHV vacuum conditions of 10-6mbar or lower - for experiments working with high levels of hydrocarbons or corrosive substances additional conditions may apply. Please be aware of the vacuum guidelines for FLASH experiments.
For questions regarding the FLASH1 pump-probe laser please consult the respective web pages and contact the FS-LA group.

Benjamin Erk
E-Mail: Benjamin Erk
Phone: +49 (0)40 8998 6237
Location: 49 / 112
Contact for BL1 / CAMP
Christopher Passow
E-Mail: Christopher Passow
Phone: +49 (0)40 8998 1815
Location: 49 / 116
Jonathan Correa
E-Mail: Jonathan Correa
Phone: +49 (0)40 8998 6599
Location: 99 / O3.005
Contact for pnCCD detectors for CAMP

L. Strüder et al., Large-format, high-speed, x-ray pnCCDs combined with electron and ion imaging spectrometers in a multipurpose chamber for experiments at 4th generation light sources, Nucl. Instr. and Meth. in Phys. Res. A 614, 483 – 496 (2010).