S 2 DEL - Solid State and Diamond Electronics Lab ROMA TRE 1/11 Rivelatori in diamante per imaging...
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Transcript of S 2 DEL - Solid State and Diamond Electronics Lab ROMA TRE 1/11 Rivelatori in diamante per imaging...
S2DEL - Solid State and Diamond Electronics Lab
ROMATRE
1/11
Rivelatori in diamante per imaging di sorgenti UV e X
S2DEL – Solid State and Diamond Electronics LabDip. di Fisica “Edoardo Amaldi” – Roma Tre Università degli Studi
Marco Girolami
S2DEL - Solid State and Diamond Electronics Lab
ROMATRE
2/11Imaging di sorgenti UV e X
Obiettivo: monitorare in tempo reale la forma e l’intensità del fascio
• Tecniche microanalitiche (EXMA, XPS, XRD, XRF)
• Radiografia industriale
• Diagnostica medica e radioterapia
• litografia circuiti integrati VLSI-ULSI e dispositivi MEMS
• chirurgia oculistica rifrattiva (LASIK)
• UV imaging in riflessione
UV
Raggi X
S2DEL - Solid State and Diamond Electronics Lab
ROMATRE
3/11Stato dell’arte: profilometri in silicio
Matrici CCD per imaging di sorgenti UV e X:
PROs: • tecnologia collaudata
• buona Q.E. in matrici back-thinned
• rivelatori di grande area
CONs: • danni da radiazione
• forte assorbimento VIS-IR
• fragilità, ingombro, costo elevato
Necessaria la presenza di:
• attenuatori per impedire danni da radiazione
• sistemi ottici per massimizzare la discriminazione UV-VIS
Esempio di sistema
commerciale per imaging UV
S2DEL - Solid State and Diamond Electronics Lab
ROMATRE
4/11Perché il diamante?
Il diamante è un materiale d’elezione per la realizzazione di rivelatori per sorgenti X ed UV di elevata intensità, grazie ad una serie di proprietà chimico-fisiche di estremo interesse:
• è chimicamente inerte• ha la più alta energia di coesione (7.45 eV/atom)• è insensibile al danno da radiazione• è trasparente nelle regioni spettrali VIS e IR• ha un’ampia gap (5.45 eV)• ha una bassa conducibilità elettrica (< 10-15 S/cm)• ha la più alta conducibilità termica (22 Wcm-1K-1)
Assenza di attenuatori e/o
filtri fra sorgente e rivelatore
S2DEL - Solid State and Diamond Electronics Lab
ROMATRE
5/11Principio di funzionamento dei rivelatori a matrice
S2DEL - Solid State and Diamond Electronics Lab
ROMATRE
6/11Rivelatore multipixel per imaging 2D
S2DEL - Solid State and Diamond Electronics Lab
ROMATRE
7/11
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5.25 mm
Centroide: ( 1.29 , 3.66 )
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Centroide: ( 1.36 , 3.67 )
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Centroide: ( 1.49 , 3.69 )
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Centroide: ( 1.69 , 3.68 )
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6.25 mm
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Centroide: ( 2.02 , 3.76 )
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6.50 mm
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Centroide: ( 2.40 , 3.72 )
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6.75 mm
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Centroide: ( 2.82 , 3.78 )
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7.00 mm
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Centroide: ( 3.25 , 3.74 )
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7.25 mm
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Centroide: ( 3.66 , 3.78 )
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7.50 mm
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Centroide: ( 4.11 , 3.78 )
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7.75 mm
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Centroide: ( 4.49 , 3.78 )
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8.00 mm
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Centroide: ( 4.94 , 3.77 )
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8.50 mm
Centroide: ( 5.57 , 3.60 )
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8.75 mm
Centroide: ( 5.71 , 3.59 )
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9.00 mm
Centroide: ( 5.70 , 3.56 )
1 2 3 4 5 6S1
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8.25 mm
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0125000250000375000500000625000750000875000
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Centroide: ( 5.33 , 3.70 )
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01E+05
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buio
Centroide: ( 3.51 , 3.54 )
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1E+06
posizione pixel
Evoluzione temporale profilo lampada UV (32 canali)
Deuterium 10 μW, 220 nm
S2DEL - Solid State and Diamond Electronics Lab
ROMATRE
8/11
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Profilo 2D laser a eccimeri ArF 193 nm (32 canali)
12
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Shutter chiuso Singolo impulso “Ghost peak”
Monitoraggio in tempo reale dei singoli impulsi laser
S2DEL - Solid State and Diamond Electronics Lab
ROMATRE
9/11Profilo 2D di fascio di raggi X
Tubo di Coolidge:
• target in Mo (Kα = 17.48 keV, Kβ =19.6 keV)
• V = 45 kV
• I = 1.1 mA
• spot-size 3 mm
Traslazione fascio lungo
l’asse X
S2DEL - Solid State and Diamond Electronics Lab
ROMATRE
10/11Profilo 2D di fascio di raggi X
Traslazione fascio lungo
l’asse Z
Il fascio diverge all’aumentare della
distanza dalla sorgente
S2DEL - Solid State and Diamond Electronics Lab
ROMATRE
11/11
GRAZIE PER L’ATTENZIONE