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Metallic Magnetic Calorimeters for High-Resolution X-ray Spectroscopy

Metallic Magnetic Calorimeters for High-Resolution X-ray Spectroscopy. D. Hengstler, C . Pies, S . Schäfer, S . Kempf, M. Krantz, L. Gamer, J. Geist, A. Pabinger, E. Pavlov, P . Ranitzsch, M. Wegner, V. Wißdorf, T. Wolf, L . Gastaldo , A. Fleischmann, C . Enss

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Metallic Magnetic Calorimeters for High-Resolution X-ray Spectroscopy

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  1. Metallic Magnetic Calorimeters for High-Resolution X-ray Spectroscopy D. Hengstler, C. Pies, S. Schäfer, S. Kempf, M. Krantz, L. Gamer, J. Geist, A. Pabinger, E. Pavlov, P. Ranitzsch, M. Wegner, V. Wißdorf, T. Wolf,L. Gastaldo, A. Fleischmann,C. Enss Kirchhoff-Institute forPhysics Heidelberg University

  2. 1 x 8 pixel array for X-rays up to 20 keV 250 m 250 m X-ray absorber:Electrodeposited Au 5 m Stems:Electrodeposited Au Temperature sensor:Co-sputtered Au:Er300 ppm Superconducting pickup coil: Sputtered Nb SQUID magnetometer

  3. 1 x 8 pixel array for X-rays up to 20 keV

  4. 55Mn characterization measurements Counts / 0.3 eV Energy [keV] Baseline Counts / 0.3 eV • Compared to expected energy resolution DEFWHM=2.6 eV slightly degraded due to untriggered small pulses Energy [keV]

  5. 55Mn characterization measurements Measured energy [keV] Flux change [Φ0] Time [s] Difference [keV] Energy [keV]

  6. Cross talk x 10-4

  7. X-ray spectroscopy at an EBIT at the MPIK* ADR EBIT detector * Max-Planck-Institute for Nuclear Physics, Heidelberg

  8. Magnetic Shielding Superconducting Nb grid 7 mm • Microfabricated • Spacing 100 m • Width 5 m • Thickness 3 m • Trancparency ~ 90% Nb cup attached to 4K plattform

  9. Magnetic Shielding Without Al shield With Al shield Al cup attached to detector plattform

  10. X-ray spectroscopy at an EBIT at the MPIK Transitions in Sc-like (W53+) ... Ni-like (W46+) tungsten photon energy (eV) photon energy (eV) electron energy (eV) photon energy (eV) S. Georgi, Max-Planck-Institute for Nuclear Physics, Heidelberg, 2013

  11. Detecting 60 keV • 6.4 0

  12. 1 x 8 pixel array for X-rays up to 200 keV 2000 m 500 m 140 m SQUID In perfect agreement with expected resolution

  13. 1 x 8 pixel array for X-rays up to 200 keV Measured Simulated (FEMM) • DEFWHM=60 eV • Degradation due to position dependent pulse shape Massive absorber on 7 mm thick stems Au absorber Au:Er sensor 1st Nb layer SQUID

  14. Towards a 2d-array • Planned detector geometries 1 mm 2 mm 7 mm 8 mm • Detector will be mounted on the side arm of a dry dilution fridge

  15. Summary

  16. Applications • maXs: X-ray spectroscopy • atomic physics • astronomy • X-ray imaging • large MMC arrays • microwave SQUID multiplexing • Detection of molecular fragments • Radiation standards for metrology • Neutrino mass experiments • β decay of 187Re (MARE) • EC of 163Ho • β β decay of 100Mo (AMoRE) Advantages of MMCs • High energy resolution • Large energy bandwidth • Quantum efficiency up to 100% • Excellent linearity • Fast signal rise time U91+

  17. maXs (Micro-Calorimeter Arrays for High Resolution X-Ray Spectroscopy) e.g. at Gas-Jet-Target behind HITRAP at GSI/FAIR 2d detector array X-Ray Lens for soft x-rays(U Jena) 10 keV Gas-Jet Target (U Frankfurt) 100 keV Beam of decelleratedHighly Charged Ions (HITRAP, GSI/FAIR)

  18. Towards a 2d-array 4 mm 1 mm 7 mm

  19. Towards a 2d-array 4 mm 1 mm 7 mm

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