A novel high resolution, high frame rate detector based on a microchannel plate read out with the Medipix2 counting CMOS pixel chip

The future of ground-based optical astronomy lies with advancements in adaptive optics (AO) to overcome the limitations that the atmosphere places on high resolution imaging. A key technology for AO systems on future very large telescopes are the wavefront sensors (WFS) which detect the optical phase error and send corrections to deformable mirrors. Telescopes with >30 m diameters will require WFS detectors that have large pixel formats (512/spl times/512), low noise (<3 e/sup -//pixel) and very high frame rates (/spl sim/1 kHz). These requirements have led to the idea of a bare CMOS active pixel device (the Medipix2 chip) functioning in counting mode as an anode with noiseless readout for a microchannel plate (MCP) detector. First measurement results obtained with this novel detector are presented both for UV photons and beta particles.

[1]  R. Dinapoli,et al.  Medipix2: A 64-k pixel readout chip with 55-/spl mu/m square elements working in single photon counting mode , 2001 .

[2]  Bettina Mikulec,et al.  Noiseless imaging detector for adaptive optics with kHz frame rates , 2004, SPIE Astronomical Telescopes + Instrumentation.

[3]  Robert K. Tyson.  Introduction to Adaptive Optics , 2000 .

[4]  John V. Vallerga,et al.  Optically sensitive Medipix2 detector for adaptive optics wavefront sensing , 2005 .

[5]  V. Zhdanov,et al.  Chevron of microchannel plates as position-sensitive detector for β-spectrometers , 1986 .

[6]  Jason McPhate,et al.  Optimization of the readout electronics for microchannel plate delay line anodes , 2000, SPIE Optics + Photonics.

[7]  Jurriaan Schmitz,et al.  The readout of a GEM or Micromegas-equipped TPC by means of the Medipix2 CMOS sensor as direct anode , 2004 .

[8]  Claire E. Max,et al.  Introduction to Adaptive Optics , 2004 .

[9]  J. V. Vallerga,et al.  Advanced MCP sensors for UV/visible astronomy and biology , 2003 .

[10]  M. Razzano,et al.  Reading a GEM with a VLSI pixel ASIC used as a direct charge collecting anode , 2004, physics/0403019.

[11]  G. Molinari,et al.  SLIM (Secondary emission monitor for Low Interception Monitoring) an innovative non-destructive beam monitor for the extraction lines of a hadrontherapy center , 2004, 2003 IEEE Nuclear Science Symposium. Conference Record (IEEE Cat. No.03CH37515).

[12]  B. Mikulec,et al.  Development of segmented semiconductor arrays for quantum imaging , 2003 .