MHSP with position detection MHSP with position detection capability capability H. Natal da Luz Luz a,b , J.F.C.A. Veloso Veloso a,b , N.F.C. Mendes Mendes b , H. Natal da a,b , J.F.C.A. a,b , N.F.C. b , J.M.F. dos Santos Santos b , J. A. Mir Mir c J.M.F. dos b , J. A. c Physics Dept Dept., ., University University of of Aveiro, 3810 Aveiro, 3810- -193 Aveiro, Portugal 193 Aveiro, Portugal a a Physics Physics Dept Dept., ., University University of of Coimbra, 3004 Coimbra, 3004- -516 Coimbra, Portugal 516 Coimbra, Portugal b b Physics Instrumentation Dept., CCLRC Rutherford Appleton Laboratory, Chilton, Dept., CCLRC Rutherford Appleton Laboratory, Chilton, c c Instrumentation Didcot, Oxon, OX11 0QX, UK , Oxon, OX11 0QX, UK Didcot 1 1 16 Sept Sept. 2005 . 2005 PSD 7 Liverpool 16 PSD 7 Liverpool
Outline Outline � The The Micro Micro Hole Hole and and Strip Strip Plate Plate – – working working � principle; ; principle � Applications Applications; ; � � 2D 2D capability capability – – 1D 1D prototype prototype; ; � � Position Position linearity linearity and and resolution resolution – – results results; ; � � Conclusions Conclusions and and future future work work. . � 2 2 16 Sep Sep. 2005 . 2005 PSD 7 Liverpool 16 PSD 7 Liverpool
The Micro Hole and Strip Plate - - MHSP MHSP The Micro Hole and Strip Plate Top Bottom Top Bottom 200 μ m � A MSGC and GEM combination in a single plate A MSGC and GEM combination in a single plate � m µ m hole / strip pitch ~ 200 µ hole / strip pitch ~ 200 � � � Distance between holes ~140 Distance between holes ~140 µ µ m m � 3 3 16 Sep Sep. 2005 . 2005 PSD 7 Liverpool 16 PSD 7 Liverpool
The Micro- -Hole & Strip Plate gas Hole & Strip Plate gas The Micro detector operation detector operation X-ray 2 multiplication stages 2 multiplication stages � Hole gain > 10 Hole gain > 10 3 3 � � MS gain MS gain ≈ ≈ 30 30- -100 100 � � Gain > Gain > 10 5 for several gases for several gases 10 5 � E drift MHSP-top V CT V AC e.g., e.g., Cathode strip Anode strip Veloso Veloso et et al. al. , RSI, 71(2000)2371 , RSI, 71(2000)2371 Cathode plane Maia et et al. al. , NIM A 504 (2003)364 , NIM A 504 (2003)364 Maia Veloso et et al. al. , NIM A524 (2004)124 , NIM A524 (2004)124 Veloso 4 4 16 Sep Sep. 2005 . 2005 PSD 7 Liverpool 16 PSD 7 Liverpool
Applications Applications � Atmospheric Atmospheric pressure pressure: : � � High High gain gain multipliers multipliers in in standard standard and and noble noble- -gas gas � mixtures ( (simple simple to to purify purify - - no no gas ageing) gas ageing) mixtures � X X- -ray ray & & UV UV- -Photon Photon detectors detectors � � High High pressures pressures: : � � Noble Noble gas gas mixtures mixtures � � Dual Dual- -phase phase ( (liq liq/ /gas gas) ) detectors detectors: : Dark Dark- -matter matter, PET, , PET, etc etc. . � � Medical Medical applications applications � � Hard Hard X X- -ray ray & n & n detectors detectors, , etc etc. . � 5 5 16 Sep Sep. 2005 . 2005 PSD 7 Liverpool 16 PSD 7 Liverpool
2D MHSP configuration 2D MHSP configuration High charge induction in top electrode (35% of the charge at the � anode) allows the implementation of the 2 nd coordinate readout. By structuring both sides, 2D readout by resistive charge division � is possible. 6 6 16 Sep Sep. 2005 . 2005 PSD 7 Liverpool 16 PSD 7 Liverpool
MHSP with resistive charge division MHSP with resistive charge division 1D readout implementation 1D readout implementation Resistive layer anodes 1 mm cathodes + holes • Resistive layer crossing the electrodes • Only 2 preamplifiers / coordinate X L • Simple electronic system k X = • Low cost solution X X + L R 7 7 16 Sep Sep. 2005 . 2005 PSD 7 Liverpool 16 PSD 7 Liverpool
Position linearity linearity Position • Colimator holes - 2 mm in diamerter - 5 holes • 109 Cd x-ray source placed @ the position of each hole Good position linearity – mean deviation ~ 0.15 mm full range 8 8 16 Sep Sep. 2005 . 2005 PSD 7 Liverpool 16 PSD 7 Liverpool
Position resolution Position resolution • Colimator holes - 2 mm in diamerter - 3 holes • 109 Cd x-ray source placed @ - 0 mm position - 5 cm from the window Low background – rejection logic needed for further reduction � No improvement in resolution for smaller holes!! next slide � 9 9 16 Sep Sep. 2005 . 2005 PSD 7 Liverpool 16 PSD 7 Liverpool
Measurements with with a pulse a pulse generator generator Measurements � Good Good FWHM for FWHM for constant constant “ “X X L ” and and “ “X X R ” L ” R ” � � Bad Bad division division!!! !!! – – energy energy dependence dependence � � Position Position resolution resolution is is limited limited by by the the 1.3 mm 1.3 mm fluctuation fluctuation � introduced by by the the electronic electronic division division circuit circuit. . introduced 10 10 16 Sep Sep. 2005 . 2005 PSD 7 Liverpool 16 PSD 7 Liverpool
Conclusions Conclusions � I nexpensive I nexpensive and and simple simple construction construction; ; � � Good Good position position linearity linearity; ; � � Position Position resolution resolution is is limited limited by by the the energy energy dependence dependence of of � the electronic the electronic readout readout, , not not yet yet fully fully exploited exploited. . The future future The � Development Development of of a a non non energy energy dependent dependent electronic electronic division division � readout – – Goal Goal P Resolution < 0.5mm; readout P Resolution < 0.5mm; � MHSP MHSP structured structured on on the the top top electrode electrode for 2D for 2D position position � determination is is under under construction construction @ CERN; @ CERN; determination 2 window a 15 x 15 cm 2 � development development of of a 15 x 15 cm window 2D detector 2D detector � 11 11 16 Sep Sep. 2005 . 2005 PSD 7 Liverpool 16 PSD 7 Liverpool
Thank you you Thank for your your attention attention! ! for 12 12 16 Sep Sep. 2005 . 2005 PSD 7 Liverpool 16 PSD 7 Liverpool
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