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Inserire curva di attenuation length normale

18 August 2006. Inserire curva di attenuation length normale. 0.8 mm 250 ppm part 1 - measure 2. 3 August 2006. Warning Preliminary results. Warning do not trust the error. Preliminary. The first measurement on this fiber, made on half the points only :. l 2 = 3580 +/- 1000 mm.

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Inserire curva di attenuation length normale

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  1. 18 August 2006 Inserire curva di attenuation length normale 0.8 mm 250 ppm part 1 - measure 2 3 August 2006 Warning Preliminary results Warning do not trust the error Preliminary The first measurement on this fiber, made on half the points only : l2 = 3580 +/- 1000 mm l1 = 7620 +/- 400 mm Fit from 0 to 17 m 0.8 mm 250 ppm part 1 - measure # 2 Fit from 0 to 17 m The data were fitted to the functional form: why to fit from 0 till 17 m only ?

  2. 18 August 2006 0.7 mm 150 ppm part 1 - measure 01 0.7 mm 150 ppm part 1 - measure 01 Fit from 0 to 9 m Fit from 9 to 24 m 9 August 2006

  3. Preliminary results 18 August 2006

  4. To be further investigated: 18 August 2006 Systematic in the measurement • Study the systematics • Estimate the measurement reproducibility Riproducibility on 1 meter of fiber measurement Upgrade of the apparatus: • more focussed and better shielded led spot • increase of the length of the motorized bench to 1.5 m

  5. Spectral response as function of distance along the fiber 18 August 2006 Measurements performed at ISOF CNR-Bologna on a 25 meter 0.8 mm 200 ppm ( reference) fiber. N. Moggi , S. Zucchelli and A. Barbieri ISOF- CNR Bologna The light source was a Helium-Cadmium Kimmon S3522 laser 442 nm continous emission laser, 37 mW, beam spot diameter ~0.94 mm, laser stability ~ +/- 2%. The fiber was coupled to an Avantes - AVA Spec 2048 spectrometer.

  6. 18 August 2006 Fit to a single exponential: inverse of attenuation length as function of wavelenght

  7. 18 August 2006 Plan for the immediate future: • Complete on all the fibers the measurements of attenuation length. 0.6 mm fiber is next. 0.6 150 ppm should be under way right now . • Measure relative light yeald • Measure spectral response. • Test of fiber response as function of bending radius • Results foreseen for next Nova Collaboration meeting in November 06 Next: • Pseudocumene from Borexino shall arrive in Bologna by end of August. • Start test of fiber survival in pseudocumene • Start aging test

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