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S.Baccaro, A.Cecilia INFN Rome DPG 6/9/05 July 2005 irradiation test results of SIC & BTCP crystals I.Dafinei, M.Diemoz ENEA-Casaccia & INFN Rome.

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Presentation on theme: "S.Baccaro, A.Cecilia INFN Rome DPG 6/9/05 July 2005 irradiation test results of SIC & BTCP crystals I.Dafinei, M.Diemoz ENEA-Casaccia & INFN Rome."— Presentation transcript:

1 S.Baccaro, A.Cecilia INFN Rome DPG 6/9/05 July 2005 irradiation test results of SIC & BTCP crystals I.Dafinei, M.Diemoz ENEA-Casaccia & INFN Rome

2 10 EB crystals made in Russia and 10 EB crystals produced in China (crystals) were irradiated in identical conditions @ 319.7 Gy/h dose rate: 466.7 Gy21749.9 Gy LTO and TT measurements @ 3, 9, 15, 21 cm ( distance from FF ) Damage recovery @ 18 °C followed for 22 days. Standard and Full Saturation tests on BTCP & SIC crystals

3 Barcode LT360 (%) LT420 (%) LT620 (%) Infl. (nm) S. Infl. (%/nm) TT sp. (nm) TT grad (nm/cm) LY (pe/MeV) FNUF (%/X0) 3143.169.474.5353.63.300.750.00410.627-0.122 3239.869.274.2354.83.341.000.00210.224-0.035 3341.167.473.2353.83.170.710.0049.985-0.140 3440.667.773.2354.03.201.200.00610.061-0.292 3539.468.073.9354.83.290.760.00310.168-0.111 3640.467.873.4354.43.361.140.0059.9600.196 3741.366.971.5354.13.321.150.00510.131-0.160 3842.968.273.8353.53.310.530.00310.376-0.299 3943.169.074.3353.63.310.950.00510.529-0.286 4038.368.974.2355.23.170.870.0049.9670.166 Mean41.068.2573.62354.23.280.910.00410.203-0.108  1.650.840.880.590.0710.220.0010.2370.176 Qualification parameters of Russian Crystals

4 Barcode LT360 (%) LT420 (%) LT620 (%) Infl. (nm) S. Infl. (%/nm) TT sp. (nm) TT grad (nm/cm) LY (pe/MeV) FNUF (%/X0) 0234.263.772.0353.52.5971.0000.00711.424-0.383 0534.765.071.8354.62.9891.4500.01711.211-0.189 0731.963.971.7354.62.6573.3600.05310.756-0.269 1124.661.770.5357.72.5972.4100.0399.845-0.492 1529.764.071.6356.12.8511.2600.02310.775-0.600 1726.161.969.5357.02.5811.8600.02710.469-0.376 1831.265.671.7356.22.9241.9500.03211.197-0.646 2428.863.070.5356.32.8381.9400.03111.127-0.492 6131.364.571.1355.62.9081.7500.02511.405-0.273 6229.966.272.6356.73.0192.0600.03210.919-0.312 Mean30.2463.9571.3355.832.7961.9040.02910.913-0.403  3.191.470.911.270.1720.6560.0120.4830.150 Qualification parameters of Chinese Crystals

5 Comparison of Qualification Parameters mean values Barcode LT360 (%) LT420 (%) LT620 (%) Infl. (nm) S. Infl. (%/nm ) TT sp. (nm) TT grad (nm/cm) LY (pe/MeV) FNUF (%/X0) Mean41.068.2573.62354.23.280.910.00410.203-0.108  1.650.840.880.590.070.220.0010.2370.176 Barcode LT360 (%) LT420 (%) LT620 (%) Infl. (nm) S. Infl. (%/nm) TT sp. (nm) TT grad (nm/cm) LY (pe/MeV) FNUF (%/X0) Mean30.2463.9571.3355.92.801.9040.02910.913-0.403  3.191.470.911.270.170.6560.0120.4830.150 BTCP SIC

6  ( ) of all analysed crystals after 466.7 Gy BTCP SIC

7  (420nm) of BTCP & SIC crystals after 466.7 Gy At 466.7 Gy radiation hardness parameters are within specifications for 100 % of Russian crystals and 80% for Chinese. BTCP SIC

8  ( ) of all analysed crystals after 21749.9 Gy BTCP SIC

9  (420nm) of BTCP & SIC crystals after 21749.9 Gy At 21749.9 Gy radiation hardness parameters are within specifications for 50 % of Russian crystals and 70% for Chinese. SIC BTCP

10 SIC Comparison of Light Yield before and after irradiation

11 BTCP SIC Fraction of Light Yield lost after irradiation

12 Comparison of FNUF before and after irradiation BTCP SIC

13 r = μ SFS / μ FS Saturation level reached in SFS conditions with respect to FS

14 q = (μ FS - μ Recov )/ μ FS Fraction of recovered colour centres after 22 days from the stop of irradiation

15 BarcodeLT360LT420LT620SLTODTTOLY8X0FNUF 10429.4066.0073.303.0862.09410.306-0.286 11432.6066.7073.203.1683.25111.465-0.229 12029.6066.3073.203.0221.80711.186-0.284 12224.2065.6073.102.9602.20910.749-0.038 12625.9065.9073.202.9942.61710.602-0.147 13729.7060.1071.802.4573.17311.121-0.418 13835.5064.7072.702.6782.29412.371-0.381 13925.7064.4072.402.8822.20510.4280.009 14724.3063.2072.202.7382.31110.700-0.261 21324.9065.0073.102.8552.77310.280-0.289 16226.3064.2071.802.8353.70010.467-0.226 16327.1065.3072.603.0172.73410.741-0.442 17326.4063.4071.502.8591.98210.408-0.329 17428.6066.8072.903.1764.00310.681-0.084 26532.1063.0071.502.5863.06411.494-0.292 27031.0066.1072.502.9582.34210.956-0.101 27135.2067.9074.403.1062.26011.8990.000 27728.8066.8073.503.0122.54610.928-0.221 28225.2060.6071.402.5111.72910.912-0.299 28938.0065.2072.003.1350.60412.798-0.254 Mean29.0364.8672.622.9022.48511.024-0.228 StdDev4.002.010.790.2140.7470.6830.131 Min24.2060.1071.402.4570.60410.280-0.442 Max38.0067.9074.403.1764.00312.7980.009 IRRADIATION TESTS ON SIC PRODUCTION EB CRYSTALS

16 Irradiation tests on sic production EB crystals 1h 20min @350 Gy/h

17 Distribution of radiation damage @ 420 nm (1h 20min @350 Gy/h)

18 Distribution of radiation damage @ 420 nm (1h 20min @350 Gy/h) 1.15  0.39 1.48  0.37 0.88  0.32 1.22  0.24 1.21  0.33 1.39  0.65 DPG-June05

19 Some China made crystals (#02, #18) have a remarkably high radiation hardness and fast saturation of the damage. Nevertheless, their overall behaviour is quite non-uniform (possible consequence of large spread of their optical parameters). Russian crystals have a uniform behaviour under irradiation exposure. If SFS conditions are considered, radiation hardness qualification parameters are reliable for 100% of Russian crystals and 80% of Chinese. For FS conditions the reliability drops to 50% in the case of Russian crystals and 70% for Chinese. CONCLUSIONS

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