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Comprehensive Radiation Simulations in CMS Using MARS: Insights and Results

This study focuses on comprehensive simulations of radiation in the CMS detector, conducted using the MARS framework. Since 2007, efforts have been made to reassess beam-induced radiation, particularly within the pixel detector, to ensure safety during potential beam accidents. Scenarios analyzed include pp collisions, machine-induced backgrounds, and beam accidents. The results are stored in a database and accessible via a web tool, which provides detailed maps and tables of radiation dose, particle fluence, and energy spectra. Recent presentations and notes detail findings crucial for CMS operations.

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Comprehensive Radiation Simulations in CMS Using MARS: Insights and Results

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  1. Radiation Simulations in CMS Pushpa Bhat, Nikolai Mokhov, Anil Singh* Fermilab Batavia, IL * Panjab Univ., India

  2. MARS Simulation Studies • Latest round of efforts • Started in 2007, to re-evaluate beam-induced radiation in CMS, particularly in the pixel detector due to concerns of safety in typical beam-accident scenarios – e.g., single module abort kicker prefire initiating asynchronous beam abort • Scenarios Studied • pp collisions at L=1034 cm2sec-1 • Machine-induced Backgrounds: beam-gas, beam halo • Beam Accidents (potentially the most risky) • Simulation Results: Maps and tables of radiation dose, particle fluence, energy spectra are available. Results in (r,z) stored in a database. Web Tool exists to extract numbers. Over a dozen presentations given at CMS mtgs. • CMS Notes: CMS CR-2009/262 (pp results conf rep for tracker) CMS Note-2009/000 (Beam accident studies) Detailed CMS Note on pp results in preparation

  3. The Detector MARS Model BCS BCM1 HB HE

  4. CMS:MARS MODEL

  5. Radiation Dose (Gy/s) @L= 1034cm-2 s-1

  6. Absorbed Dose (50 fb-1) 105 104 103 102 10 1 10-1 10-2

  7. Comparison with TDR results 105 104 103 102 10 1 10-1 10-2 Note: Overlaid contours (TDR; Mika H) are for 500 fb-1 while the bottom plot (MARS, this study) is for 50 fb-1

  8. HCAL (including HF)

  9. Absorbed Dose 2E-4 Gy/s  1MRad / 500 fb-1 HE HB R

  10. Neutron Fluence HE HB R

  11. Charged Hadron Fluence R

  12. HF Region Max. Dose >100x than in HE

  13. Dose/Fluence Web Calculator Returns results for a given radius, z and L.dt using data in a database

  14. Dose/Fluence Web Calculator • The database and the tool are being extended.

  15. Dose (Gy) 100 fb-1 Finer granularity

  16. Summary • Extensive radiation simulations have been done for the CMS detector, over the past few years using MARS15. • pp at 14 TeV, 10 TeV, 3.8T, 0T • preliminary beam-gas, beam-halo • Beam accidents • Lots of results and tools exist!

  17. Extra Slides

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