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Spectra distortion by the interstrip gap in spectrometric silicon strip detectors Vladimir Eremin and.

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Presentation on theme: "Spectra distortion by the interstrip gap in spectrometric silicon strip detectors Vladimir Eremin and."— Presentation transcript:

1 Spectra distortion by the interstrip gap in spectrometric silicon strip detectors Vladimir Eremin (vladimir.eremin@cern.ch)vladimir.eremin@cern.ch and E. Verbitskaya, I. Eremin, Yu. Tuboltsev, N. Fadeeva, N. Egorov, S. Golubkov, W. Chen, Z. Li Ioffe Phisical – Technical Institute, St. Petersburg Research Instjtute of Material and Technology, Moscow Brookhaven National Lab., Upton, NY V. Eremin, PSD-9, Aberystwyth, September 12 - 16, 2011

2 Outline Motivation Detector entrance window structure Charge collection in the entrance window Electric field in inter-strip gap Charge collection in inter-strip gap Conclusions V. Eremin, PSD-9, September 12 - 16, 2011

3 NuSTAR-EXL detecting system in FAIR program V. Eremin, PSD-9, September 12 - 16, 2011

4 Specification for DSSD detectors in EXL RegionThickness (mm) Pitch (mm) Energy range (MeV) Total detectors area, m 2 A0.30.10.1 - 1700.3 B 0.10.1 minimum0.5 C0.1 and 0.30.10.1 minimum1 D0.1 and 0.30.1n/d1.2 E0.30.5 (0.3)n/d1 E’0.30.1n/d1.5 V. Eremin, PSD-9, September 12 - 16, 2011

5 Wafer layout with full size 6.5x6.5 cm 2 DSSD Consortium: “Silicon detector lab.”, St. Petersburg, Russia Current density 3.8 nA/cm 2 V. Eremin, PSD-9, September 12 - 16, 2011

6 The problem counts energy E0 P2P1 Al thickness______________0 µm P + entrance window_______20 nm SiO 2 thickness____________700 nm Energy losses (5.5 MeV, Si) _130 keV/ µ m strip B SiO 2 strip A P1 P2 P + implant Al V. Eremin, PSD-9, September 12 - 16, 2011

7 P + -side effective window p + implant SiO 2 V. Eremin, PSD-9, September 12 - 16, 2011

8 Track at the planar detector entrance window (energy and charge losses) Dead layer SiO 2 +Al Defects at the SiO 2 /Si interface Radiation and processing defects in the bulk Back diffusion from the track V. Eremin, PSD-9, September 12 - 16, 2011

9 Electric field in the detector entrance window The effective window thickness for the developed detectors is 20 nm (for 5.5 MeV alphas) V. Eremin, PSD-9, September 12 - 16, 2011

10 The energy resolution components Spectrum of 210 Po measured by detector with optimized structure of p-n junction. The energy resolution of 8.1 keV. (From: E.Verbitskaya, et.al., Nucl. Instr. Meth.. B 84 (1994) 51) V. Eremin, PSD-9, September 12 - 16, 2011

11 Spectra for the strip region (alphas 238 Pu) Version 1 Effective thickness of entrance window: W eff = 110 nm Energy resolution - 12.8 keV V. Eremin, PSD-9, September 12 - 16, 2011 Version 2 Effective thickness of entrance window: W eff = 25 nm Energy resolution – 9.8 keV

12 The interstrip gap structure SiO 2 n - silicon Effective entrance window Potential extremum V. Eremin, PSD-9, September 12 - 16, 2011

13 Model for spectra response of interstrip gap A(x) = A0 – ε(  SiO2 – mX) Counts or dN/dA Amplitude A SiO 2 W eff Saddle point W eff Point generation – no charge sharing Symmetric E(X, Z) in the gap Linear W eff (Z) + _ Particle Strip 1Strip 2 Z X Spectra response SiO 2 Spectra shape is: dN/dA = 1/m V. Eremin, PSD-9, September 12 - 16, 2011

14 Potential in interstrip gap Parameters: Gap width – 10 um, Charge in SiO 2 – 4x10 14 cm -2, Si resistivity – 5 kOhm-cm, d = 300 um, V b = 100V X=0 X=0.5 um X=0.7 um X=1 um X=2 um X=3 um X=4 um X=5 um V. Eremin, PSD-9, September 12 - 16, 2011

15 Parameterization of potential extremum and W eff in the interstrip gap W max = 2.2 (X - X 0 ) 0.28 with X 0 = 0.6um W eff = ɣ W max ɣ = 0.6 for kT/q = 25 mV W eff V. Eremin, PSD-9, September 12 - 16, 2011

16 Alpha spectrum for interstrip gap + _ Z X Simulated “Gap spectrum” correlates with the experimental in major features: the energy range triangle shape Parameters: Gap width – 10 um, Charge in SiO 2 – 4x10 14 cm -2, Si resistivity – 5 kOhm-cm, d = 300 um, V b = 100V V. Eremin, PSD-9, September 12 - 16, 2011

17 Conclusions 1.The developed model predicts the main features of short range particle spectra measured with strip detectors: triangle shape of the spectra generated in interstrip gap. 2. The model can be simply extended for detection of any short range particles. 3.The model gives a background for parameterization of interstrip gap properties as an element disturbing the detector spectra response. Acknowledgement This work was supported by: Russian Academy of Sciences (program # 9C237) Physico-technical institute RAS (program # ГР0120ю080052) Consortium PTI-RIMST - “Silicon Detector Lab.” V. Eremin, PSD-9, September 12 - 16, 2011

18 Thank you for your attention V. Eremin, PSD-9, September 12 - 16, 2011

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