Dependence of radiation resource of detectors on operating conditions of collider.

摘要

The long-term (t=2 years) cycling irradiation is performed for the first time of solid scintillators with the gamma-source Cs-137 at D=1.2(+-) 0.14 Gy/hour load over the temperature range from 298 to 378 K. With the superposition method, the dependence is obtained of the limiting dose D(sub lim) = f(D, (xi)), where xi is approximately 10%, the light loss after irradiation. Coefficients k(sub 3) are calculated for the resource formula: t(sub r) k(sub 3) (D(sub lim)/D), if the D(sub lim) is determined from the faster tests at D >= 100 Gy/hour. In the case of LHC radiation loads to the detectors, 10 to the -1st power up to 10 to the -4 power, the values of k(sub 3) are in the range 2 x 10 to the -2nd power up to 7 to 10 to the -4th power what is explained by the photoradiation oxidizing. Under irradiation with the breaks the resource t(sub R) is much greater than t(sub r), but it requires to correlate the sessions and the breaks with the account of collider operation regime and scintillator recovery time. In the framework of this work, at D(sub lim) (<=) 4 kGy the record time of recovery is obtained: the PS2 sample recovers for 104% in 6 hours. This sample is made from PSM-115 by casting under pressure and, for the first time, it contains the anti-oxidants and photo-stabilizers added instead of the anti-rads. 13 refs., 3 figs., 3 tabs.