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1 IWAD 2014 IWAD2014, Kolkata 2-7/5/2010 Gaseous Photon DetectorsSilvia DALLA TORRE Photon Detection with MPGDs S. Dalla Torre.

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1 1 IWAD 2014 IWAD2014, Kolkata 2-7/5/2010 Gaseous Photon DetectorsSilvia DALLA TORRE Photon Detection with MPGDs S. Dalla Torre

2 2 IWAD 2014 IWAD2014, Kolkata 2-7/5/2010 Gaseous Photon DetectorsSilvia DALLA TORRE OUTLINE  Introductory considerations  Gaseous PDs, historical overview  I generation - photoconverting vapours  II generation – MWPCs with solid state CsI PC  MPGD-based PDs  Basic principles and architectures aseous PDs with sensitivity in the visible range  Gaseous PDs with sensitivity in the visible range  Cryogenic MPGD-based PDs  Detecting electroluminescence produced in avalanche processes for frontier research and applications  Conclusions

3 3 IWAD 2014 IWAD2014, Kolkata 2-7/5/2010 Gaseous Photon DetectorsSilvia DALLA TORRE OUTLINE  Introductory considerations  Gaseous PDs, historical overview  I generation - photoconverting vapours  II generation – MWPCs with solid state CsI PC  MPGD-based PDs  Basic principles and architectures aseous PDs with sensitivity in the visible range  Gaseous PDs with sensitivity in the visible range  Cryogenic MPGD-based PDs  Detecting electroluminescence produced in avalanche processes for frontier research and applications  Conclusions

4 4 IWAD 2014 WHY GASEOUS PDs ?  the most effective solution for what concerns the cost of large detector area application ( a cheap approach )  operation in magnetic field ( low sensitivity to B )  minimum material budget when the photon detectors have to seat in the experiment acceptance ( advantages for experiment architectures ) IWAD2014, Kolkata 2-7/5/2010 Photon Detection with MPGDsSilvia DALLA TORRE

5 5 IWAD 2014 DETECTION GOALS  Historically, the development has been guided by the requirements of the Cherenkov imaging counters for PID, namely the goal has been the challenging detection of SINGLE PHOTONS  Detection of scintillation light, mainly in rare-event noble liquid counters  The relevance of generating/detecting ELECTROLUMINESCENCE PHOTONS by MPGDs for fundamental research and applications has become evident more recently IWAD2014, Kolkata 2-7/5/2010 Photon Detection with MPGDsSilvia DALLA TORRE

6 6 IWAD 2014 IWAD2014, Kolkata 2-7/5/2010 Gaseous Photon DetectorsSilvia DALLA TORRE OUTLINE  Introductory considerations  Gaseous PDs, historical overview  I generation - photoconverting vapours  II generation – MWPCs with solid state CsI PC  MPGD-based PDs  Basic principles and architectures aseous PDs with sensitivity in the visible range  Gaseous PDs with sensitivity in the visible range  Cryogenic MPGD-based PDs  Detecting electroluminescence produced in avalanche processes for frontier research and applications  Conclusions

7 7 IWAD 2014 GASEOUS PDs, I GENERATION IWAD2014, Kolkata 2-7/5/2010 Gaseous Photon DetectorsSilvia DALLA TORRE Gaseous photon detectors, the first generation: converting vapours OMEGA DELPHI TMAE(Tetrakis-Dimethylamine-Ethylene) TEA (Tri-Ethyl-Amine) SLD - CRID CLEO III E605

8 8 IWAD 2014 GASEOUS PDs, I GENERATION  TMAE IWAD2014, Kolkata 2-7/5/2010 Gaseous Photon DetectorsSilvia DALLA TORRE QE, NIMA 323 (1992) 351 TMAE DELPHI barrel RICH, NIMA 273 (1988) 247 DELPHI barrel RICH Photosensitive volume: 5 cm thick cloisons Anode wire thick photosensitive volume (slow photon detectors, parallax error) heating and temperature control (T _bubbling <T_operation) photon feed-back from amplification region (protections) chemically extremely reactive

9 9 IWAD 2014 GASEOUS PDs, I GENERATION IWAD2014, Kolkata 2-7/5/2010 Gaseous Photon DetectorsSilvia DALLA TORRE TEA NIMA 554 (2005) 147 CLEO III, NIMA 441 (2000) 374 technical challenges of the far UV domain large chromatic dispersion in far UV region: Proximity focusing (the Chromatic dispersion is not the major resolution limitation) He, a radiator gas with extremely reduced chromatic dispersion

10 10 IWAD 2014 GASEOUS PDs, II GENERATION  MWPCs with solid state photocathode (the RD26 effort) IWAD2014, Kolkata 2-7/5/2010 Gaseous Photon DetectorsSilvia DALLA TORRE TIC, NA44 COMPASS,RICH-1 CsI area > 5 m 2 JLAB-HALL A ALICE-HMPID CsI area > 10 m 2 STAR HADES A solid state photocathode exposed to a gaseous atmosphere in an effective PD: a success !

11 11 IWAD 2014 GASEOUS PDs, II GENERATION Photocathode - the most robust one in gaseous atmosphere: CsI  Structure of the PDs @ 2 kV (typical): E (CsI surface) ~ 7 kV/cm IWAD2014, Kolkata 2-7/5/2010 Gaseous Photon DetectorsSilvia DALLA TORRE P. Abbon et al, NIM A 577 (2007) 455. The best quartz cuts here A. Di Mauro, NIM A 525 (2004) 173. COMPASS, RICH-1 PDs

12 12 IWAD 2014 PCs, WHICH CONFIGURATION ? Reflective versus semi-transparent photocathodes  REFLECTIVE - larger photoelectron collection :  Semitransparent photocathode - the application of a thin metallic film, which absorbs photons, on the entrance window is required  the probability of photoelectron absorption is lower in a reflective photocathode than in a semitransparent one as the conversion probability is the highest at the entrance surface of the photo-converter  the thickness of the photo-converter layer is non critical in the reflective configuration, contrary to the semitransparent one: this aspects is very relevant for large area detectors IWAD2014, Kolkata 2-7/5/2010 Gaseous Photon DetectorsSilvia DALLA TORRE

13 13 IWAD 2014 PHOTOELECTRON EXTRACTION  Photoelectron extraction from a CsI film, the role of gas and E IWAD2014, Kolkata 2-7/5/2010 Gaseous Photon DetectorsSilvia DALLA TORRE M. Alexeev et al., NIM A (2010) in press C. D. R. Azevedo et al., 2010 JINST 5 P01002 A. A.Breskin et al., B. B.NIM A 367 (1995) 342 VACUUM

14 14 IWAD 2014 GASEOUS PDs, II GENERATION MWPCs with CsI photocathode, the limits  Severe recovery time (~ 1 d) after detector trips  Ion accumulation at the photocathode moderate gain:<10 5  Feedback pulses  Feedback pulses (effective gain: <1/2)  Ion and photons feedback from the multiplication process not fast  Aging after integrating a few mC / cm 2  Ion bombardment of the photocathode IWAD2014, Kolkata 2-7/5/2010 Gaseous Photon DetectorsSilvia DALLA TORRE H. Hoedlmoser et al., NIM A 574 (2007) 28. 1 mC/cm 2 0.2 mC/cm 2 MWPCs  slow signal formation + low gain  “slow” electronics (signal integration, low noise level)   Gassiplex FE : integration time ~ 0.5  s, time res> 1  s   APV (COMPASS RICH-1 upgrade) : resolution ~ 400 ns  Detector memory, i.e. not adequate for high rates

15 15 IWAD 2014 TOWARDS THE FUTURE TWO REQUESTS  Reduced photon and Ion BackFlow (IBF)  Reduced ageing  High gain  high photoelectron detection efficiency  Intrinsically fast gaseous detectors (signal due to electron motion)  Short integration time  High rate environments MICROPATTERN GASEOUS DETECTORS MICROPATTERN GASEOUS DETECTORS IWAD2014, Kolkata 2-7/5/2010 Gaseous Photon DetectorsSilvia DALLA TORRE

16 16 IWAD 2014 IWAD2014, Kolkata 2-7/5/2010 Gaseous Photon DetectorsSilvia DALLA TORRE OUTLINE  Introductory considerations  Gaseous PDs, historical overview  I generation - photoconverting vapours  II generation – MWPCs with solid state CsI PC  MPGD-based PDs  Basic principles and architectures aseous PDs with sensitivity in the visible range  Gaseous PDs with sensitivity in the visible range  Cryogenic MPGD-based PDs  Detecting electroluminescence produced in avalanche processes for frontier research and applications  Conclusions

17 17 IWAD 2014 First developments … GEM-based PDs ION & PHOTON BLOCKING GEOMETRIES IWAD2014, Kolkata 2-7/5/2010 Gaseous Photon DetectorsSilvia DALLA TORRE A. Breskin and R. Chechwik, NIM A 595 (2008) 116 Semi-transparent PC Reflective PC e - avalanche ion avalanche NO photon feedback Reduced ion feedback An “old” idea R. Chechwik et al., NIM A 419 (1998) 423

18 18 IWAD 2014 ION & PHOTON BLOCKING GEOMETRIES … and applications: PHENIX HBD, a threshold Cherenkov counter (window-less) Central message for any similar application  Reversed bias cuts the MIP signal ! Aspects non exportable to imaging devices:  detection of >> 1 photon per pad: low gain (5000)  non negligible noise level (~20% single photon signal)  detect photons with down to ~110 nm: chromaticity ! IWAD2014, Kolkata 2-7/5/2010 Gaseous Photon DetectorsSilvia DALLA TORRE ~ 1 m Cherenkov blobs blobs e+e+e+e+ e-e-e-e- B≈0 Standard Bias Reverse Bias MIP HV CsI Transparent mesh 90% W. Anderson et al., NIMA 646 (2011) 35

19 19 IWAD 2014 GEM-based PDs and IBF rich literature about IFB in GEM-based detectors here examples with semi-transparent PC IWAD2014, Kolkata 2-7/5/2010 Gaseous Photon DetectorsSilvia DALLA TORRE ICICICIC IAIAIAIA I bottom3 I top1 E D = 0.5 kV/cm E D = 0.1 kV/cm E ~ 1 kV/cm needed for good photoelectron extraction strong dependence from gain and E DRIFT strong dependence from gain and E DRIFT poor dependence from pressure and gas type poor dependence from pressure and gas type The same for reflective PCs : small and reversed E D is needed A. Bondar et al., NIMA 496 (2003) 325 A. Breskin et al., NIMA 478 (2002) 225d 10 -3 10 -2 10 -1 IBF: a few % level in effective GEM-based photon detectors

20 20 IWAD 2014 OVERCOMING IBF More complex geometries needed with extra electrodes to trap the ions: Micro-Hole & Strip Plate (MHSP), COBRA Micro-Hole & Strip Plate (MHSP), COBRA IWAD2014, Kolkata 2-7/5/2010 Gaseous Photon DetectorsSilvia DALLA TORRE J.F.C.A. Veloso et al., Rev.Sc. Instr. 71 (2000) 2371 A.V. Lyashenko et al., JINST 2 (2007) P08004 MHSP COBRA A.V. Lyashenko et al., NIMA 598 (2009) 116 A.V. Lyashenko et al., NIMA 598 (2009) 116

21 21 IWAD 2014 GEM-based PDs and GAIN IWAD2014, Kolkata 2-7/5/2010 Gaseous Photon DetectorsSilvia DALLA TORRE LARGE GAIN RELEVANT FOR SINGLE PHOTON DETECTION  GEM-based PDs in laboratory studies  for single photoelectron detection, they have been operated at gains > 10 5 (see, for instance, the plots of the previous slides)  GEM-based detectors in experiments  Always a MIP flux and small rates of heavily ionizing fragments crossing the detectors (even when the detectors are used as photon detectors)  At COMPASS: G ~ 8000 (B. Ketzer, private comm.)  At LHCb: G ~ 4000 (M.Alfonsi NIMA 581 (2007) 283)  At TOTEM: G ~ 8000 (G. Catanesi, private comm.)  Phenix HBD: G ~ 4000 (W. Anderson et al., NIMA 646 (2011) 35)  In experiments, small chances to operate GEM-based PDs at gains > 10 4

22 22 IWAD 2014 THGEM-based PDs, why ? PCB technology, thus:  robust  mechanically self supporting  industrial production of large size boards  large gains have been immediately reported (rim !) reported (rim !) Comparing to GEMs  Geometrical dimensions X ~10  But e - motion/multiplic. properties do not!  Larger holes:  dipole fields and external fields are strongly coupled  e - dispersion plays a minor role IWAD2014, Kolkata 2-7/5/2010 Gaseous Photon DetectorsSilvia DALLA TORRE introduced in // by different groups: L. Periale et al., NIM A478 (2002) 377. P. Jeanneret, PhD thesis, Neuchatel U., 2001. P.S. Barbeau et al, IEEE NS50 (2003) 1285 R. Chechik et al,.NIMA 535 (2004) 303 RIM About PCB geometrical dimensions: Hole diameter : 0.2 – 1 mm Pitch : 0.5 – 5 mm Thickness : 0.2 – 3 mm

23 23 IWAD 2014 ABOUT THE RIM IWAD2014, Kolkata 2-7/5/2010 Gaseous Photon DetectorsSilvia DALLA TORRE NO RIM RIM: 100  m RIM: 10  m S. Dalla Torre et al., IEEE – NSS 2008, Dresden 19-25/10/2008 zoom X-ray measurements E DRIFT (kV/cm) NO RIM RIM: 100  m RIM: 10  m E DRIFT (kV/cm) Energy resolution (%) NOTE: two different scales RIM: 10  m RIM: 100  m Effective gain NO RIM E DRIFT (kV/cm) THGEM & RIM & RIM

24 24 IWAD 2014 THGEM GAIN & RIM employing large rim (100  m) IWAD2014, Kolkata 2-7/5/2010 Gaseous Photon DetectorsSilvia DALLA TORRE minimum rim (<10  m) A. Breskin et al., NIMA (2010) in press Single photons M. Alexeev et al., JINST 5 (2010) P08009 Single photons Gain limited to ~10 5 in test beam THGEMs Dim: 0.4 mm Pitch: 0.8 mm Thickn.: 0.4mm

25 25 IWAD 2014 More about THGEMs IWAD2014, Kolkata 2-7/5/2010 Gaseous Photon DetectorsSilvia DALLA TORRE High rate device Irradiation: 8.9 KeV X-ray 0 20 40 60 80 100 120 Rate (kHz / mm 2 ) I (pA) 0 1000 2000 IBF control single THGEM, no RIM M. Alexeev et al., JINST 7 (2012) C002014 Tripple THGEM: Ion Back Flow reduction by staggering plates IBFR (%) A E TR2 (kV/cm) M E TR1 (kV/cm) IBFR < 5% !

26 26 IWAD 2014 PHOTOELECTRON EXTRACTION IWAD2014, Kolkata 2-7/5/2010 Gaseous Photon DetectorsSilvia DALLA TORRE photoelectron trajectories from a THGEM photocathode, simulation, multiplication switched off thickness 0.6 mm, diam. 0.4 mm, pitch: 0.8 mm, ΔV = 1500 V photoelectron lost (not entering the holes) the holes) E = - 500 V E = 500 V photoelectron lost ( filed too low for extraction) x cross-section field above the THGEM E = 0 x y

27 27 IWAD 2014 PHOTOELECTRON EXTRACTION IWAD2014, Kolkata 2-7/5/2010 Gaseous Photon DetectorsSilvia DALLA TORRE Ar/CH 4 : 40/60; 60/40  V = 1kV 1.1, 1.2 1.25, 1.3 1.351.5 ZOOM ZOOM S. Dalla Torre et al., TIPP09 - Tsukuba, Japan 11-17/3/2009 external electric field applied Counting mode technique Active area: 54 % Active area: 77 % C. Shalem et al., NIMA 558 (2006) 475 Anodic current

28 28 IWAD 2014 PHOTOELECTRON EXTRACTION IWAD2014, Kolkata 2-7/5/2010 Photon Detection with MPGDsSilvia DALLA TORRE B A D B A D C C Photoelectron extraction from THGEM PC fully confirmed by direct observation with “Leopard” Courtesy of the Budapest and Trieste THGEM groups G.Hamar and D.Varga, NIMA 694(2012) 16

29 29 IWAD 2014 THGEM R&D for RICHes IWAD2014, Kolkata 2-7/5/2010 Photon Detection with MPGDsSilvia DALLA TORRE COMPASS, RICH-1 upgrade by Triple THGEM detectors ALICE VHPID THGEM & HYBRID beam Č photon 300 x 300 mm 2 active surface V.Peskov et al., NIMA 695 (2012) 154

30 30 IWAD 2014 NUMBER OF DETECTED PHOTONS N of detected photons is ~60-70% of MWPCs with CsI N of detected photons is ~60-70% of MWPCs with CsI  Ne+10%CH4, used with  V at 650-750 V  Relative extraction efficiency Respect to pure methane at E ~ 7kV/cm ~ 75% (my estimate) IWAD2014, Kolkata 2-7/5/2010 Photon Detection with MPGDsSilvia DALLA TORRE C. D. R. Azevedo et al., 2010 JINST 5 P01002 V.Peskov et al., NIMA 695 (2012) 154

31 31 IWAD 2014 Gain ~ 130K Single Photon spectrum in BEAM !!! HYBRID MPGD PDs (THGEM + …)   The 1 st THGEM forms the PC   The 2 nd THGEM (staggered) forces the electron diffusion   The MM provides large gain, made larger by the diffusing the impinging electron cloud IWAD2014, Kolkata 2-7/5/2010 Photon Detection with MPGDsSilvia DALLA TORRE THGEM staggered ! Courtesy of the COMPASS-THGEM group beam Č photon The same architecture independently studied in parallel as GPM for DM searches (see later)

32 32 IWAD 2014 HYBRID MPGD PDs (THGEM + …)   2 THGEMs   a THCOBRA with 2 d R-O structure IWAD2014, Kolkata 2-7/5/2010 Photon Detection with MPGDsSilvia DALLA TORRE T. Lopes 2013 JINST 8 P09002

33 33 IWAD 2014 IWAD2014, Kolkata 2-7/5/2010 Gaseous Photon DetectorsSilvia DALLA TORRE OUTLINE  Introductory considerations  Gaseous PDs, historical overview  I generation - photoconverting vapours  II generation – MWPCs with solid state CsI PC  MPGD-based PDs  Basic principles and architectures aseous PDs with sensitivity in the visible range  Gaseous PDs with sensitivity in the visible range  Cryogenic MPGD-based PDs  Detecting electroluminescence produced in avalanche processes for frontier research and applications  Conclusions

34 34 IWAD 2014 GASEOUS DETECTORS FOR VISIBLE LIGHT  photocathodes for visible light  Chemical reactivity (gas purity better than ppm level needed  UHV materials and sealed detectors)  PC stability under ion bombardment - work function lower than CsI one  AGEING CsI: -16% QE at 25  C/mm 2 Bilkaly: -20% QE at 0.4  C/mm 2 IWAD2014, Kolkata 2-7/5/2010 Gaseous Photon DetectorsSilvia DALLA TORRE A.V.Lyashenko et al., 2009 JINST 4 P07005 F-R-MHSP, IBF: 3 x 10 -4 Doulble GEM, IBF: ~ 10 -2 K-Cs-Sb vs CsI T.Moriya et al., NIMA 732 (2013) 263 F.Tokanai et al., NIMA 628 (2011) 190

35 35 IWAD 2014 GASEOUS DETECTORS FOR VISIBLE LIGHT  Dedicated photoelectron extraction studies IWAD2014, Kolkata 2-7/5/2010 Gaseous Photon DetectorsSilvia DALLA TORRE t F. Tokanai et al., NIMA 610 (2010) in press Bialkali, Gas P 675 torr

36 36 IWAD 2014 The Capillary Plate (CP) approach GASEOUS DETECTORS FOR VISIBLE LIGHT IWAD2014, Kolkata 2-7/5/2010 Gaseous Photon DetectorsSilvia DALLA TORRE V. Peskov et al., NIMA 433 (1999) 492 J.Va’vra and T. Sumiyoshi, NIMA, 435 (2004) 334 MCP coupled to Micromegas Inclined to reduce more the IBF (tested with CsI)

37 37 IWAD 2014 the GEM approach GASEOUS DETECTORS FOR VISIBLE LIGHT IWAD2014, Kolkata 2-7/5/2010 Gaseous Photon DetectorsSilvia DALLA TORRE Pulsed ion gating A. A.Breskin et al., B. B.NIMA 553 (2005) 46 Multiple GEM sealed TIME LINE K-Cs-Sb - Continuous mode, not a sealed PD A.V.Lyashenko et al., 2009 JINST 4 P07005 R.Chechik et al., NIMA 502 (2003) 195 Poor compatibility of bialkali and GEM material ? Extremely poor QE of the bialkali PC: the material of the GEM chemically reacts with the bialkali metals F. Tokanai et al., NIMA 610 (2009) 164

38 38 IWAD 2014 GASEOUS DETECTORS FOR VISIBLE LIGHT the MicroMega approach IWAD2014, Kolkata 2-7/5/2010 Gaseous Photon DetectorsSilvia DALLA TORRE K-Cs-Sb Double MM, Ni mesh Vacuum, 20% Ar (90%)+CH 4 (10%) 12% (stable) after 1.5 y IBF : <2.5×10 −3 Gain < 10 4 F. Tokanai et al., NIMA 610 (2009) 164 More recently: 2 staggered MM layers to enhance ion trapping In collaboration with HAMAMATSU IBF : 6 ×10 −4 Gain : 10 4 F. Tokanai et al., NIMA (2014) in press

39 39 IWAD 2014 IWAD2014, Kolkata 2-7/5/2010 Gaseous Photon DetectorsSilvia DALLA TORRE OUTLINE  Introductory considerations  Gaseous PDs, historical overview  I generation - photoconverting vapours  II generation – MWPCs with solid state CsI PC  MPGD-based PDs  Basic principles and architectures aseous PDs with sensitivity in the visible range  Gaseous PDs with sensitivity in the visible range  Cryogenic MPGD-based PDs  Detecting electroluminescence produced in avalanche processes for frontier research and applications  Conclusions

40 40 IWAD 2014 CRYOGENIC MPGD-PDs  Read-out elements of cryogenic noble liquid detectors  Rear event detectors (, DM)  Detecting the scintillation light produced in the noble liquids  Options of scintillator light and ionization charge detection by a same detector ! with WINDOW WINDOWLESSOPERATED IN THE (2-PHASES)CRYOGENIC LIQUID (2-PHASES)CRYOGENIC LIQUID IWAD2014, Kolkata 2-7/5/2010 Photon Detection with MPGDsSilvia DALLA TORRE L.Arazi et al., JINST 8 (2013) C12004S.Duval et al., JINST 6 (2011) P04007 A. A.Bondar et al., NIMA 556 (2006) 273

41 41 IWAD 2014 ELECTROLUMINESCECE MPGDs are source (and detection) of electroluminescence  Fast, no ion distortion IWAD2014, Kolkata 2-7/5/2010 Photon Detection with MPGDsSilvia DALLA TORRE A. A.Bondar et al., JINST 5 (2010) P08002 A. A.Akimov et al., NDIP2011 A. A.Buzulutskov et al., JINST 1(2006) P08006 NIR VUV

42 42 IWAD 2014 MPGD PDs beyond fundamental research  Gaseous Compton camera for medical applications  Electroluminescence light is detected by THCOBRA with 2D R-O  Drift time provides the third coordinate IWAD2014, Kolkata 2-7/5/2010 Photon Detection with MPGDsSilvia DALLA TORRE

43 43 IWAD 2014 IWAD2014, Kolkata 2-7/5/2010 Gaseous Photon DetectorsSilvia DALLA TORRE OUTLINE  Introductory considerations  Gaseous PDs, historical overview  I generation - photoconverting vapours  II generation – MWPCs with solid state CsI PC  MPGD-based PDs  Basic principles and architectures aseous PDs with sensitivity in the visible range  Gaseous PDs with sensitivity in the visible range  Cryogenic MPGD-based PDs  Detecting electroluminescence produced in avalanche processes for frontier research and applications  Conclusions

44 44 IWAD 2014 SUMMARY / CONCLUSIONS  GASEOUS PHOTON DETECTORS  Still no other approach to instrument large surfaces at affordable costs  MPGD-BASED PHOTON DETECTORS  The handle to overcome the limitations of open geometry gaseous PDs  R&D in the context of MPGDs: dedicated developments needed for photon detection  A wide R&D effort (wider than what I could present) !  APPLICATIONS OF MPGD-BASED PHOTON DETECTORS  From PID to, DM, medical applications … IWAD2014, Kolkata 2-7/5/2010 Gaseous Photon DetectorsSilvia DALLA TORRE

45 45 IWAD 2014 THANK YOU

46 46 IWAD 2014 SPARE SLIDES

47 47 IWAD 2014 GASEOUS PDs, THE PRESENT MWPCs with CsI photocathode, the limits  Severe recovery time (~ 1 d) after detector trips  Feedback pulses moderate gain:<10 5  Ion feedback and photons from the multiplication process (effective gain: <1/2)  Aging after integrating a few mC / cm 2 not particularly fast  Ion bombardment of the photocathode IWAD2014, Kolkata 2-7/5/2010 Gaseous Photon DetectorsSilvia DALLA TORRE H. Hoedlmoser et al., NIM A 574 (2007) 28. 1 mC/cm 2 0.2 mC/cm 2 Proof of the CsI film degradation thanks to an accident (COMPASS RICH-1), chamber contaminated by air: water absorption is largely enhanced where the ion bombardment has been more intense

48 48 IWAD 2014 PHOTOELECTRON EXTRACTION “ the ETE includes also the extraction efficiency from the PC into the gas “ IWAD2014, Kolkata 2-7/5/2010 Gaseous Photon DetectorsSilvia DALLA TORRE C. Shalem et al., NIMA 558 (2006) 475 Normaliz. E=3 kV/cm Counting mode technique Ar:CH 4 = 95 : 5 THGEM Tick 0.4 mm diam. 0.3 mm Pitch 0.7 mm Rim: 0.1 mm Active area: 54 % Active area: 54 % Active area: 77 %

49 49 IWAD 2014 PHOTOELECTRON EXTRACTION 5/5 IWAD2014, Kolkata 2-7/5/2010 Gaseous Photon DetectorsSilvia DALLA TORRE Anodic current in a THGEM detector versus the external electric field applied, a measurement Ar/CH 4 : 40/60; 60/40  V = 1kV 1.1, 1.2 1.25, 1.3 1.351.5 The behaviour predicted by the simulation is confirmed!  A clear suggestion to optimise the detector design the detector design ZOOM S. Dalla Torre et al., TIPP09 - Tsukuba, Japan 11-17/3/2009

50 50 IWAD 2014 ABOUT THE RIM RIM - analogous to the GEM conical hole profile GEM conical hole profile IWAD2014, Kolkata 2-7/5/2010 Gaseous Photon DetectorsSilvia DALLA TORRE 2007 2006 NO RIM RIM: 100  m same HV THGEM & RIM & RIM RIM: 10  m S. Dalla Torre et al., IEEE – NSS 2008, Dresden 19-25/10/2008 zoom

51 51 IWAD 2014 MORE ABOUT THE RIM IWAD2014, Kolkata 2-7/5/2010 Gaseous Photon DetectorsSilvia DALLA TORRE Diam (mm) Pitch (mm) Rim (  m) Thick (mm) 0.30.700.4 0.30.7100.4 0.30.71000.4 the charge accumulation at the dielectric surface that allows to obtain much larger gains makes it difficult to have complete charge makes it difficult to have complete charge collection collection NOTE: two different scales NO RIM RIM: 10  m RIM: 100  m NO RIM RIM: 100  m RIM: 10  m Effective gain E DRIFT (kV/cm) Energy resolution (%) X-ray measurements S. Dalla Torre et al., IEEE – NSS 2008, Dresden 19-25/10/2008

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