| Paper | Title | Page |
|---|---|---|
| MOPE17 | OCTOGLIDE - Table Positioning Device for Diffraction Applications | 38 |
|
||
|
A new Table Positioning Device(TPD) for high precision and heavy load manipulations has been developed. Conceived as an alternative to the precision hexapods it fulfils the gap of sample (and/or, instruments) positioning in small (height) available working spaces of synchrotron Diffractometers (Dm). The concept is based on a Redundant Parallel Kinematic Structure (Rd-PKS) with four (4) legs having 2 dof active joints (actuators). In this Proof of Functionality (PoF) step, a stacked solution has been adopted for actuators design using the existent XY translation Positioning Units (Pu). The symmetrically modular 6-4(PP)PS precision mechanism - OCTOGLIDE(OG) having eight (8) gliding actuators (P) is implying also a pair of wedges - Elevation (El) and socket/ball - Guiding (G) Pu, as passive joints (P and S) forming one of the Positioning modules (Pm). Spatial positions can be reached without any singularities and planar motions along/around X or Y axis are performed very intuitively with some of the actuators (decoupled) motion. The first tests of the prototype are revealing both, high accuracy (straightness, flatness, etc) and stiffness capabilities.
* Merlet JP, Parallel robots, Springer, 2006 |
||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-MOPE17 | |
| About • | paper received ※ 09 September 2016 paper accepted ※ 19 September 2016 issue date ※ 22 June 2017 | |
| Export • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | |
WEPE16 |
High Power Load Monochromator for Computed Tomography Program at BMIT at Energies 25-150 keV | |
|
||
| A high power load monochromator has been constructed for computed tomography (CT) studies at the BioMedical Imaging and Therapy (BMIT) facility located at the Canadian Light Source. A non-dispersive pair of bent Laue-type crystals is used, with the first crystal water-cooled. The monochromator operates at energies from 25 to 150 keV, and the maximum width of the beam is 190 mm at crystal location. The beam intensity is between 1013 and 1014 photons/s/mm2 under typical operating conditions. In normal mode of operation, if the first crystal is bend with 3 N*m and the second crystal with 2 N*m torque, the measured FWHM of the spectral bandwidth at 50 keV is 1%. With the improved design of the holding springs, the monochromator is quite insensitive to vibrations, it can operate with small turbo pump attached for medium resolution imaging at 20-50 keV. Due to high power loads, the system experiences high out-gassing and a proper filter set to protect the crystal and to reduce the thermal drift is required. High level of radiation inside the monochromator vessel is the reason the operation of the system must be based only on mechanical end-switch calibration. | ||
| Export • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | |
WEPE31 |
MRT LIFT - a High Accuracy Positioning System for Biomedical Imaging and Therapy Program at BMIT | |
|
||
| The Microbeam Radiation Therapy (MRT) Lift is a large, high precision, eight stage positioning and scanning system installed at BMIT Facility. In order to guarantee a uniform exposure rate of the sample, the vertical speed of the main stage (Zscan) is constant with <1% error over the 700 mm vertical excursion. It may reach 200 mm/s. The main CT stage (PHI1) can rotate 120 kg load with speed up to 30 rpm. The verified accuracy of the motion is less than 5 Um. Other stages include: Ytrans - horizontal positioning of the vertical rotational axis to the beam, PHI2 - kappa axis used for specimen positioning, PHI3 - rotary axis used for specimen positioning and Xpos, Ypos , Zpos: fine positioning stages. Alignment of the sample using the MRT Lift is a time consuming and challenging task. The BMIT Group has developed a Python-based MRT Lift positioning and control program that uses a combination of computational and iterative methods to independently adjust the sample’s X, Y, Z, pitch and roll positions. Integration with the SolidWorks modelling platform allows high quality renderings of the MRT Lift in its current or proposed position to be displayed in real time. | ||
| Export • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | |