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pCVD diamond beam position monitors for PETRA III

Eckhard WörnerDiamond Materials GmbH Tullastraße 72, 79108 Freiburg, Germany

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Outline

• Some news about “Diamond Materials”

• pCVD diamond beam position monitors for PETRA III

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Fraunhofer IAF / Micronas

Fraunhofer IAF

Micronas GmbH

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Low pressure deposition of diamond:CVD: Chemical Vapor Deposition

T = 700 - 900°C

Microwave-Plasma

H , CH 42

CVD Diamond

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Synthesis

Isolated crystallites (nucleation) polycrystalline plate

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Proprietary deposition technology: P6

6 kW 2.45 GHz

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Ultraflat diamond windows

Planarity /10

1.5” diamond windows

Wavefront distortion /5

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Superpolished diamond substrates

Peak to valley ±5nmRa < 1nmDiameter 10mm

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Nanocrystalline diamond films and plates

thickness 50nm to 50µmroughness as low as 20nm

renucleation results in mirror grade surface finish

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Polycrystalline diamond membranes

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Polycrystalline diamond membranes

Polished > 2µm / Ø: 10mmUnpolished > 50nm Ø: 1mm

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Outline

• Some news about “Diamond Materials”

• pCVD diamond beam position monitors for PETRA III

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PETRA III at DESY Hamburg

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Fluorescence screens

… to get the beam into the beamline… to align the beam… to detect obstacles… to examine the beam profile

Diamond Light Source

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Fluorescence screens

… to get the beam into the beamline… to align the beam… to detect obstacles… to examine the beam profile

Diamond Light Source

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pCVD diamond beam position monitors for PETRA III

fluorescence detectors

diamond… converts X-rays into visible light… can handle high power… is transparent

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CVD diamond fluorescence screens (measured at ESRF / ID6)

Fluorescence excited by a low power undulator beam (ESRF/ID6)

view of the camera

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Get the beam into the frontend

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Get the beam into the frontend

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Get the beam into the frontend

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Get the beam into the frontend

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Get the beam into the frontend

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Get the beam into the frontend

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Get the beam into the frontend

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Spectral fluorescence yield (measured at ESRF/ID6)

Screens for white and monochromatic beams

Luminosity stronglyenergy dependent

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Quadrant detectors for X-ray synchrotron PETRA III

Diamond Light Source

Idea: Online beam monitoring as a feedback for X-ray mirrors(Typical energies: 2.5-35 keV)

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pCVD diamond quadrant detectors for PETRA III

photodetectors

quadrant detectors for beam monitoring

“solid state ionization chamber”

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pCVD diamond quadrant detectors for PETRA III

photodetectors

• high quality pCVD diamond• membrane supported by silicon ring• open diameter: 10mm• structured metallization (20µm gap) • membrane thickness < 10µm

quadrant detectors for beam monitoring

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X-ray absorption in diamond

40% absorption2.5 keV X-rays10µm diamond

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Measurements at DIAMOND I24 Microfocus beamline

500 µm gap0.2mm stepwidth

Photon Energy : 12.68 keVFlux: 1012 ph/sBeam size: 12x12 µm2

Velocity: 0.5s/step

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Measurements at DIAMOND I24 Microfocus beamline

20 µm gap2 µm stepwidth

Photon Energy : 12.68 keVFlux: 1012 ph/sBeam size: 12x12 µm2

Velocity: 0.5s/step

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Measurements at DIAMOND I24 Microfocus beamline

Photon Energy : 12.68 keVFlux: 1012 ph/sBeam size: 12x12 µm2

Velocity: 0.5s/step

500 µm gap10 µm stepwidth

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pCVD diamond beam position monitors for PETRA III

photodetectors

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pCVD diamond quadrant detectors for PETRA III

photodetectors

single crystals?„not yet”