marcsc
Cryogenic sample changer
Phi and Chi axis
- Phi axis with continuous 360 deg. rotation, up to 2 deg./sec
- Chi axis with rotation range of 90 deg.
- Chi axis moves up automatically during sample transfer
Rotor
- motor swings in and out
- rotation range approx 110°
Goniometer head
- automatic goniometer head with x,y,z translations
- point & click centering via software
Crystal monitor
- built-in camera with large LCD screen
Carousel with 19 samples
- Storage for 19 vials
- Vials stay in LN2 all the time
- Small volume, small LN2 consumption rate
- Very small ice formation rate
HIGHLIGHTS
HIGH THROUGHPUT
Designed as a completely integrated package with the mardtb advanced goniostat for single-crystal diffraction, the marcsc is a complete turn-key sample mounting system small enough not to crowd any synchrotron hutch or X-ray laboratory. The automated data collection reduces the fatigue on scientists, and allows testing larger numbers of crystals than previously possible.
TRUE INTEGRATION
Because the marcsc is an attachment to the mardtb, it takes advantage of the convenience of one-click automatic beam alignment. The whole system aligns itself to the X-ray beam automatically and has no realignment headaches or crashing problems of independent robotic arms.
CAROUSEL WITH 19 VIALS
The removable carousel of 19 vials keeps samples safely in liquid nitrogen until they are called by the data collection program. A new carousel can be loaded by the user in just 30 seconds.
AUTOMATIC MOUNTING
Samples are mounted for data collection by a system of computer driven motors. The user can be at the instrument, outside the hutch or X-ray laboratory, or at home!
AUTOMATIC CENTERING
Optical images of the crystal from the mardtb CCD microscope and a unique image processing algorithm, are used to align the loop in the X-ray beam. An active illumination system ensures constant lighting conditions independent of external light sources.
WET MOUNT AND UNMOUNT
Samples are mounted into the cold stream directly from a full vial of liquid nitrogen. With no room temperature exposure, crystals are kept safe in the cryogenic environment. The empty vial is replaced in the liquid nitrogen during data collection, and pulled out afterwards to accept the sample directly back into liquid nitrogen.
BARCODING
Sample identification is accomplished with a built-in barcode reader and magnetic caps with 2D barcode and alphanumeric number. The reader supports standard SPINE codes (2D data matrix with 12x12, 14x14 or 16x16 dots). Beware of ink-printed codes, though! While they are easily readable by the bar-code reader, the ink layer greatly reduces the holding force of the solenoid on the goniometer head, impeding safe sample handling.
SOFTWARE CONTROL
Simple or sophisticated data collection protocols are all possible with the marcsc computer control. From screening to full data sets, the marcsc can automatically and reliably collect a full carousel of samples worth of data without user intervention. Useful crystal centering images are automatically logged for later verification.
DETECTOR SUPPORT
The marcsc cooperates with the mar345 image plate detector, and Rayonix's SX-165 CCD and MX-225 CCD detectors. It also supports a broad range of DECTRIS detectors.