1 / 11

Special Focus Workshop “Towards 10 ps single soft photon detectors”

Special Focus Workshop “Towards 10 ps single soft photon detectors” 2013 IEEE NSS/MIC/RTSD Seoul Sunday Oct 27, 2013. A very successful soft photon detector: the Photomultiplier (1934). ‘good’ quantum efficiency rather fast low noise @ high gain: very sensitive

oksana
Download Presentation

Special Focus Workshop “Towards 10 ps single soft photon detectors”

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Special Focus Workshop “Towards 10 ps single soft photon detectors” 2013 IEEE NSS/MIC/RTSD Seoul Sunday Oct 27, 2013

  2. A very successful soft photon detector: the Photomultiplier (1934) • ‘good’ quantum efficiency • rather fast • low noise @ high gain: very sensitive • little dark current, no bias current • radiation hard • quite linear • voluminous & heavy • no position resolution • expensive • quite radioactive • can’t stand B fields Amplification by multiplication: low noise!

  3. Photo Diode Avalanche Photo Diode APD Single Photon Avalanche Diode SPAD GeigerMode Avalanche Photodiode GM-APD Digital Photo Counters The Silicon PhotoMultiplier: SiPM

  4. Si-PMs are now in the focus: Efficiency: potentially 100 % but: pixelizing reduces efficiency (borders) Flat, thin, light, cheap Capable to stand strong B-field Noise, afterpulsing, recovery time Best possible time resolution……?

  5. Use a MicroChannelPlate MCP? MCP (in vacuum) John Vallerga: TimePix + MCPs We do not know how to make MEMS made MCPs. Problems: aspect ratio of holes, ion back flow, acceptance Quantum Limited Imaging Detectors, RIT 2009, John Vallerga, jvv@ssl.berkeley.edu

  6. The transmission dynode: ultra thin (20 - 100 nm) layers diamond SiNitride (Si3N4) Si doped (SiRichNitride, SRN) CsI doped SiO2 • ultra fast (single electron) detector: σ = 10 ps • E-force much larger than Lorenz force: operates in B-field • radiation hard • low mass In vacuum: no gaseous detector………..

  7. Classical Photo Cathode: Quantum Efficiency (QE) ~ 40 % at max Can this be largely improved? In vacuum: no gaseous detector………..

  8. Towards we ain’t there yet 10 psnot quite an arbitrary goal single the ultimate sensitivity soft ~ 1 eV: there are other photons (like 511 keV) photon a very fundamental particle detectors that is where we are here for Have a good exchange of information!

  9. At the end:

  10. Provoking speakers: • Paul Lecoq • Gary Varner • John Smedley • bringing forward ‘aggressive’ thesis’ like: • ‘with Si-PMs 10 ps time resolution may be feasible, • but at the cost of a lot of noise’ • ‘Scintillators are too slow for applications in 10 psdetectors • Contrarily, Cherenkov radiation becomes more important’ • ‘There is no fundamental limit for the QE of photo cathodes’

More Related