A single crystal CVD diamond x-ray beam diagnostic with embedded graphitic wire electrodes

Bloomer, Chris; Rehm, Guenther; Salter, Patrick S.; Newton, Mark E.

doi:10.1063/1.5084689

Cited by 3 publications

(3 citation statements)

References 10 publications

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“…For example, for spectrometric charged particle detectors on alternating current (AC) single‐crystal CVD diamond, an energy resolution of 0.27% has been achieved at the 5.489 MeV Am α‐line . Today, based on CVD diamond, the high‐efficiency thermal and fast neutron detectors are produced based on CVD diamond; microstrip, pixel, and 3D detectors for high‐energy physics and other fields are also being actively developed …”

Section: Introductionmentioning

confidence: 99%

High‐Pressure High‐Temperature Single‐Crystal Diamond Type IIa Characterization for Particle Detectors

Черных

Тарелкин

et al. 2020

Physica Status Solidi (a)

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Various samples of multisectoral high‐pressure high‐temperature (HPHT) single‐crystal diamond plate (IIa type) (4 × 4 × 0.53 mm) are tested for particle detection applications. The samples are investigated by X‐ray diffractometry, photoluminescence spectroscopy, Raman spectroscopy, Fourier‐transform infrared, and visible/ultraviolet (UV) absorption spectroscopy. High crystalline perfection and low impurity concentration (in the {100} growth sector) are observed. To investigate detector parameters, circular 1.0 and 1.5 mm diameter Pt Schottky barrier contacts are created on {111} and {100} growth sectors. On the backside, a Pt contact (3.5 × 3.5 mm) is produced. The {100} growth sector is proved to be a high‐quality detector: the full width at half maximum energy resolution is 0.94% for the 5.489 MeV 226Ra α‐line at an operational bias of +500 V. Therefore, it is concluded that the HPHT material {100} growth sector is used for radiation detector production, whose quality is not worse than the chemical vapor deposition method or specially selected natural diamond detectors.

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Section: Introductionmentioning

confidence: 99%

High‐Pressure High‐Temperature Single‐Crystal Diamond Type IIa Characterization for Particle Detectors

Черных

Тарелкин

et al. 2020

Physica Status Solidi (a)

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“…Highly localised and geometrically confined structural transformations in diamond with intrinsic sp 3 diamond's tetrahedral phase converted into sp 2 -rich graphitic fraction employing a laser light have shown to significantly enhance light absorption in the irradiated areas and, to open a new avenue for the emerging opto-photonic applications, including miniaturised thermionic solar cells 1 , broad-beam light detectors [2][3] and most recently, robust broad-beam polarization filters for infra-red (IR) applications 4 . These applications, however, may only become technologically accomplishable once the thermal stresses associated with laser processing and the formation of sp 2 fraction on the surface or in the bulk of the diamond crystal, are minimised while remaining spatially confined.…”

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confidence: 99%

“…These applications, however, may only become technologically accomplishable once the thermal stresses associated with laser processing and the formation of sp 2 fraction on the surface or in the bulk of the diamond crystal, are minimised while remaining spatially confined. Additionally, owing to a close lattice match between the diamond's sp 3 tetrahedral fraction and the planar two-dimensional (2D) graphene and graphite structures, direct fabrication of 'graphene-on-diamond' heterostructures by means of an in situ sp 3 -to-sp 2 conversion enables a development of a variety of robust ultra-wide bandgap 'all carbon' opto-electronic devices in a single-step fabrication process, without resorting to processes that normally require high-temperature annealing with a metal catalyst. [5][6] Conventional nano-(ns-) and pico-(ps-) second pulsed lasers transform diamond into graphite by means of a localised phonon-induced graphitization and, owing to their long laser-lattice interactions, primarily an amorphous sp 2 phase is formed in the heat affected zone (HAZ) marked by the appearance of thermally-induced cracks.…”

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confidence: 99%

Laser-Induced Graphitization of Diamond Under 30 fs Laser Pulse Irradiation

Ali

Chetty

et al. 2022

J. Phys. Chem. Lett.

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The degree of laser-induced graphitisation from a sp 3 -bonded to a sp 2 -bonded carbon fraction in a single crystal chemical vapour deposited (CVD) diamond under a varying fluence of an ultrashort pulsed laser (30 fs, 800 nm, 1 kHz) irradiation has been studied. The tetrahedral CVD sp 3 -phase was found to transition to primarily an sp 2 -aromatic crystalline graphitic fraction below the critical fluence of 3.9 J/cm 2 , above which predominantly an amorphous carbon was formed. A fractional increase of fluence from 3.3 J/cm 2 to 3.9 J/cm 2 (~ 20 %) resulted in a substantial (~ three-fold) increased depth of the sp 2 -graphitised areas owing to the non-linear interactions associated with an fs-laser irradiation. Additionally, formation of C=O carbonyl group was observed below the critical threshold fluence; the C=O cleavage occurred gradually with the increase of irradiation fluence of 30 fs laser light. The implications for these findings on enhancement of fs-driven processing of diamond are discussed.

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Study of the elastically deformed state of thin diamond plates

Digurov

Terentyev

2022

Zavod. lab., Diagn. mater.

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The development of laboratory technologies for growing high-quality diamond single crystals, as well as low thermal expansion of a diamond, make it possible to consider this material promising as an element of X-ray optics in designing free electron lasers (XFEL). Diamond crystal-spectrometers of various thicknesses and bending radii are also in demand. In this regard, the issues regarding the mechanical parameters of elastically deformed diamond single crystals require clarification, among them critical stresses in a deformed single crystal and the minimum bending radii for plates of certain geometry. The goal of the study is determination of the elastically deformed state of thin diamond plates with the parameters required in spectrometers for non-invasive diagnostics of X-ray free-electron laser (XFEL) spectra. The samples were cut from the IIa -type crystal of the highest quality grown by the temperature gradient method. Diamond plates with (110) and (111) crystallographic orientations were used in the experiments. The dependences of the stresses and bending radii on deformation value were obtained during bending thin diamond plates with a thickness of 20 μm. The experimental deformations did not exceed 1 mm. The minimum bending radii of thin diamond plates were also determined: for (111) direction — 5.6 mm, and for (110) direction — 4.5 mm. The Young’s moduli were 1198 GPa for (111) direction and 1034 GPa for (110) direction. Critical stresses during bending of thin diamond single crystals (resulting in their destruction) exceeded 2.4 GPa. The dependence of the bending radii of crystals on their thickness was calculated at a stress value of 2.0 GPa. The results of the study make it possible to calculate the allowable deformations for thin diamond plates of arbitrary shape and thickness. The data obtained will contribute to the improvement of modeling and the quality of production of curved spectrometers.

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A single crystal CVD diamond x-ray beam diagnostic with embedded graphitic wire electrodes

Cited by 3 publications

References 10 publications

High‐Pressure High‐Temperature Single‐Crystal Diamond Type IIa Characterization for Particle Detectors

High‐Pressure High‐Temperature Single‐Crystal Diamond Type IIa Characterization for Particle Detectors

Laser-Induced Graphitization of Diamond Under 30 fs Laser Pulse Irradiation

Study of the elastically deformed state of thin diamond plates

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