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The spectral energy distribution of quasars shows a sharp steepening of the continuum shortward of ≃ 1100 Å. The steepening could be a result of dust absorption. We present a dust extinction model which considers crystalline carbon grains and compare it with SMC-like dust extinction consisting of a mixture of silicate grains with graphite or amorphous carbon grains. We show that the sharp break...

We report on the behavior of CVD diamonds under intense electromagnetic radiation and on the response of the detector to high density of deposited energy. Diamonds have been found to remain unaffected after doses of 10 MGy of MeV-range photons and the diamond response to energy depositions of up to 250 GeV / cm 3 has been found to be linear to better than 2 %. These observations make diamond an...

The radiation hardness of diamonds makes them a strong candidate to replace the inner most part of the CMS tracking detector. Polycrystalline diamond has been shown to regain some its CCD under sub-bandgap irradiations due to the depolarization of the diamond sensor. Monocrystalline diamonds that have suffered proton radiation damage exhibit a similar CCD reduction due to polarization. This stu...

Studying the dependence of degree (α) and rate (ϑ) phase transformation graphite into diamond on synthesis time at different temperatures developed synthetic diamonds using technology high-pressure high-temperature in a metal melt (HPHT), we determined critical mass diamonds, which indicates entry system stability region graphite, where graphitization occurs. The role implanted metals hydrogen ...