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Resistive Microdot Microhole detector

Resistive Microdot Microhole detector. Further developments of detectors with resistive electrodes:. R. Oliveira 1 , V. Peskov 1,2 , F. Pietropaolo 3 , P. Picchi 4 1 CERN, Geneva, Switzerland 2 NAM, Mexico 3 INFN Padova, Ialy 4 INFN Fracati, Italy. Motivation of this development:.

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Resistive Microdot Microhole detector

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  1. Resistive Microdot Microhole detector Further developments of detectors with resistive electrodes: R. Oliveira1, V. Peskov1,2, F. Pietropaolo3, P. Picchi4 1CERN, Geneva, Switzerland 2NAM, Mexico 3INFN Padova, Ialy 4INFN Fracati, Italy

  2. Motivation of this development: noble liquid dark-matter detectors

  3. Double phase noble liquid dark matter detectors Two parallel meshes where the secondary scintillation light is produced From the ratio of primary/secondary lights one can conclude about the nature of the interaction Primary scintillation light

  4. Several groups are trying to develop designs with reduced number of PMs One large low cost “PM” Large amount of PMs in the case of the large-volume detector significantly increase its cost See: E. Aprile XENON: a 1-ton Liquid Xenon Experiment for Dark Matter http://xenon.astro.columbia.edu/presentations.html and A. Aprile et al., NIM A338,1994,328; NIM A343,1994,129 Another option for the LXe TPC, which is currently under the study in our group, is to use LXe doped with low ionization potential substances (TMPD and cetera).

  5. Performance of some Cs based photocathodes inside liquid and solid Ar Gulaev, V.; Peskov, V.; Silin, E.Nuclear Science Symposium and Medical Imaging Conference, 1994., 1994 IEEE Conference Record

  6. Physics behind this phenomena

  7. PM grids 10 cm CsI photocathode Experimental setup Ar gas Ar gas, 1 atm Alpha source LAr V. Peskov, P. Pietropaolo, P. Pchhi, H. Schindler ICARUS group Performance of dual phase XeTPC with CsI photocathode and PMTs readout for the scintillation lightAprile, E.; Giboni, K.L.; Kamat, S.; Majewski, P.; Ni, K.; Singh, B.KetalDielectric Liquids, 2005. ICDL 2005. 2005 IEEE International Conference Publication Year: 2005 , Page(s): 345 - 348 LAr+ gas phase

  8. The way to supress the feedback Photodetectors R-Microdot Anodes Multiplication region Resistive cathodes Shielding RETGEMs with HV gating capability Charge Event LXe hv hv CsI photocathode In hybrid R-MSGC, the amplification region will be geometrically shielded from the CsI photocathode (or from the doped LXe) and accordingly the feedback will be reduced

  9. Microhole-microstrip detector andMicrodot detectorswere introduced In our previous presentaion RD51 mini week (21-23 November 2011) “New developments in spark-protected micropattern detectors”

  10. 0.3mm Back plane (metallic or resistive) Anode strips Resistive cathode strips Holes 1mm 20μm

  11. A magnified photo of Microdot detector Anode dots Resistive cathode strips

  12. Today we will present further developments:Microdot microhole detector This detector allows 10 timed higher gas gains to achieve at cryogenic temperatures then with microstrip-microhole detector

  13. Manufacturing technique

  14. Multilayer PCB with Cu layers on the top and bottom and with the inner layer with readout strips 0.1mm a) v v v b) Upper Cu layer etching v v The grooves were then filled with resistive paste (ELECTRA Polymers) v c) 1mm 0.1mm d) Removal of the Cu Resistive cathode strips Resistive anode dots Filling with Coverlay e) Readout strips Holes

  15. Anode strips Anode dots 1mm Resistive cathode strips Primary electrons Back plane (metallic or resistive) Avalanche Holes 0.4mm

  16. Experimental setup

  17. UV lamp Back mesh Window Vb 3mm V1 V2 10-20mm Vc CsI Radioactive source: Am or 55Fe Gas chamber Cryostat Charge-sensitive amplifiers

  18. Preliminary results

  19. Measurements in Ne 300K Results obtained with alphas and 55Fe 175K 300K 140K Results obtained with UV lamp

  20. Measurements in Ar “streamer” mode Results obtained with alphas and 55Fe 124K 300K 185K Results obtained with UV lamp

  21. 105-115K 300K Stability tests (preliminary)

  22. Conclusions: •Preliminary studies indicate that Microdot-microhole detector can be very promising for cryogenic dark matter detectors with CsI photocathodes or with dopands • It offers almost 10 time higher gain than microhol-microstrip detectors • Certainly more studies are needed to demonstrate the stability, long-term operation and vitality of this approach

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