Argonne National Laboratory

Advanced Photon Source
Sector 9

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ID Introduction

The Insertion Device (ID) beamline of Sector 9 (9-ID) utilizes the x-rays produced by an Undulator 'A' insertion device. The 9-ID primary beamline is an undulator beamline with a white-beam first optics enclosure (FOE) 9-ID A located immediately downstream of the ring ratchet-wall penetration. A monochromatic beam transport section leads from the FOE to a cluster of two secondary optics enclosures (SOE) 9-ID C SOE1 and 9-ID C SOE2, and two main experimental stations 9-ID B and 9-ID C. The beam transport includes three pump station enclosures 9-ID C PS1, PS2 and PS3, connected by integrally shielded beam pipes. These pump stations are under configuration control and are not user accessible.

The FOE 9-ID A houses the major optical components of the beamline. The first element is a differential ion pump with a fixed mask, providing a 4.5 x 4.5 mm2 primary input aperture and enabling a windowless transition between the accelerator vacuum and the beamline. It is followed by a white-beam slit assembly consisting of 3 copper masks, which can be independently positioned by virtue of external actuators with vertical, lateral, pitch and yaw motion capability. The first of these masks is a 2.3 x 2.3 mm2 secondary input aperture, which can be, located anywhere within the range of primary aperture. The other 2 masks serve as a variable four-sided slit assembly, allowing further reduction of the white beam size to user-determined levels.

Following the white-beam slits is the vertical double crystal monochromator, which is of the Kohzu HLD type and features cryogenically cooled Si(111) crystals. The useful energy range of the cryo-cooled monochromator extends from 4.5 keV to 26 keV.

An integrated tungsten white beam absorber and bremsstrahlungs shield positioned downstream of the monochromator captures and absorbs the white beam while passing monochromatic radiation. An integral photon shutter is the last optical component in the FOE and isolates the white beam area of the beamline from the downstream experimental stations.

The beam transport from the FOE to the SOEs and experimental stations is accomplished through three pump station enclosures and integrally shielded beam pipes and is terminated by a beryllium window.

The first station within the downstream cluster of enclosures, 9-ID C SOE1 serves as a secondary optics enclosure for a harmonic rejection mirror and other user-accessible components such as slits and beam monitors.

Experiments can be conducted in either of the main experimental stations 9-ID B or 9-ID C. Special capabilities of the 9-ID beamline include Inelastic X-Ray Scattering (IXS) and Liquid Surface Scattering (LSS).

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