Residual dose rates in the FCChh detector

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Presentation transcript:

Residual dose rates in the FCChh detector Roxana Rata, Markus Widorski, Stefan Roesler – HSE/RP 5th July, 2017, FCChh Detector meeting

Outline Simulations Conceptual design: updated detector geometry Evaluation of the residual dose rate Conclusions 5th July, 2017, FCChh Detector meeting

Simulations FLUKA simulation to estimate the residual dose rates Many thanks to I. Besana, EN/STI who provided the geometry and the input file. Geometry and collision parameters remained identical. Adapted the material compositions Trial of two materials for the forward shielding: SS317LN and Brass in order to compare if differences in residual dose rates Dose rates in LS2 (after baseline operation) and LS5 (after ultimate operation) with 6 cooling periods: 8 hours, 1 day, 1 week, 1 month, 4 months and 1 year. 5th July, 2017, FCChh Detector meeting

Detector geometry M.I. Besana, FCC week 2017 Cavern: R = 15 m, L = 70 m 5th July, 2017, FCChh Detector meeting

Detector geometry Material adapted: Lead SS317 AA6082 C17410 C35300 CSS304L CSS316L CSS316LN YUS130S P506 KHMN30L Added radiologically important trace elements (from ActiWiz database) TAS 5th July, 2017, FCChh Detector meeting

Evaluation of the residual dose rates LS2 – 1 day of cooling down LS5 – 1 day of cooling down 5th July, 2017, FCChh Detector meeting

LS2 – 1 week of cooling down LS5 – 1 week of cooling down 5th July, 2017, FCChh Detector meeting

LS2 – 1 month of cooling down LS5 – 1 month of cooling down 5th July, 2017, FCChh Detector meeting

LS2 – 1 year of cooling down LS5 – 1 year of cooling down 5th July, 2017, FCChh Detector meeting

Residual dose rates along Z for R=0 .. 20 cm LS5 LS2 5th July, 2017, FCChh Detector meeting

Comparison between SS317LN and Brass shielding: LS2 5th July, 2017, FCChh Detector meeting

Comparison between SS317LN and Brass shielding: LS5 5th July, 2017, FCChh Detector meeting

Conclusions The residual dose rate was evaluated for the new geometry For these calculations we considered 5 different cooling periods in LS2 and LS5 No significant differences in residual dose rates where found for SS317 or brass as shielding material for short decay times. Possible beneficial for long decay times. High radiation levels in forward region; of concern for work on open detector 5th July, 2017, FCChh Detector meeting

Comparison Dipole to Solenoid design Forward dipole (2016) Solenoid design (2017) LS2, 1 week LS5, 1 week 5th July, 2017, FCChh Detector meeting

Detector geometry – Shielded areas Shielding around the forward calorimeter: 1 m of steel 5 cm of lithiated polyethylene - 1 cm of lead Shielding in front of the forward calorimeter: 5 cm of polyethylene and 2 mm thick Al covers Forward muon chambers with cast iron shielding Cylindrical shielding: 1 m cast iron -5 cm of polyethylene 1 cm of lead Conical shielding: -1 m cast iron -5 cm of polyethylene -1 cm of lead Cast iron shielding layer for the muon chambers M.I. Besana, FCC week 2017 5th July, 2017, FCChh Detector meeting