MHSP with position detection MHSP with position detection - - PowerPoint PPT Presentation

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MHSP with position detection MHSP with position detection capability capability

• H. Natal da
• H. Natal da Luz

Luza,b

a,b, J.F.C.A.

, J.F.C.A. Veloso Velosoa,b

a,b, N.F.C.

, N.F.C. Mendes Mendesb

b,

, J.M.F. dos J.M.F. dos Santos Santosb

b, J. A.

, J. A. Mir Mirc

c

a aPhysics

Physics Dept Dept., ., University University of

• f Aveiro, 3810

Aveiro, 3810-

• 193 Aveiro, Portugal

193 Aveiro, Portugal

b bPhysics

Physics Dept Dept., ., University University of

• f Coimbra, 3004

Coimbra, 3004-

• 516 Coimbra, Portugal

516 Coimbra, Portugal

c cInstrumentation

Instrumentation Dept., CCLRC Rutherford Appleton Laboratory, Chilton, Dept., CCLRC Rutherford Appleton Laboratory, Chilton, Didcot Didcot, Oxon, OX11 0QX, UK , Oxon, OX11 0QX, UK

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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. .

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The Micro Hole and Strip Plate The Micro Hole and Strip Plate -

• MHSP

MHSP

• A MSGC and GEM combination in a single plate

A MSGC and GEM combination in a single plate

• hole / strip pitch ~ 200

hole / strip pitch ~ 200 µ

µm m

• Distance between holes ~140

Distance between holes ~140 µ µm m

Top Top Bottom Bottom

200μm

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The Micro The Micro-

• Hole & Strip Plate gas

Hole & Strip Plate gas detector operation detector operation

2 multiplication stages 2 multiplication stages

• Hole gain > 10

Hole gain > 103

3

• MS gain

MS gain ≈ ≈ 30 30-

• 100

100

• Gain >

Gain > 10 10 5

5 for several gases

for several gases

e.g., e.g., Veloso Veloso et et al. al., RSI, 71(2000)2371 , RSI, 71(2000)2371 Maia Maia et et al. al., NIM A 504 (2003)364 , NIM A 504 (2003)364 Veloso Veloso et et al. al., NIM A524 (2004)124 , NIM A524 (2004)124

X-ray

MHSP-top Cathode strip Cathode plane Anode strip

VCT VAC

Edrift

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Applications Applications

• Atmospheric

Atmospheric pressure pressure: :

• High

High gain gain multipliers multipliers in in standard standard and and noble noble-

• gas

gas mixtures mixtures ( (simple simple to to purify purify -

• no

no gas ageing) gas ageing)

• 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. .

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2D MHSP configuration 2D MHSP configuration

• High charge induction in top electrode (35% of the charge at the

anode) allows the implementation of the 2nd coordinate readout.

• By structuring both sides, 2D readout by resistive charge division

is possible.

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MHSP with resistive charge division MHSP with resistive charge division 1D readout implementation 1D readout implementation

1 mm

anodes cathodes + holes

Resistive layer R L L

k X X X X + =

• Resistive layer crossing the electrodes
• Only 2 preamplifiers / coordinate
• Simple electronic system
• Low cost solution

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Position Position linearity linearity

Good position linearity – mean deviation ~ 0.15 mm full range

• Colimator holes
• 2 mm in diamerter
• 5 holes
• 109Cd x-ray source placed

@ the position of each hole

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Position resolution Position resolution

• Low background – rejection logic needed for further reduction
• No improvement in resolution for smaller holes!! next slide
• Colimator holes
• 2 mm in diamerter
• 3 holes
• 109Cd x-ray source placed @
• 0 mm position
• 5 cm from the window

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Measurements Measurements with with a pulse a pulse generator generator

• 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 introduced by by the the electronic electronic division division circuit circuit. .

• Good

Good FWHM for FWHM for constant constant “ “X XL

L”

” and and “ “X XR

R”

”

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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

• f

the the electronic electronic readout readout, , not not yet yet fully fully exploited exploited. .

The The future future

• Development

Development of

• f a

a non non energy energy dependent dependent electronic electronic division division readout readout – – Goal Goal P PResolution

Resolution < 0.5mm;

< 0.5mm;

• MHSP

MHSP structured structured on

• n the

the top top electrode electrode for 2D for 2D position position determination determination is is under under construction construction @ CERN; @ CERN;

• development

development of

• f a 15 x 15 cm

a 15 x 15 cm2

2 window

window 2D detector 2D detector

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Thank Thank you you for for your your attention attention! !