Cutting-Edge TPC Simulation Techniques at Budker INP & NSU

Cutting-edge TPC simulation techniques implemented by researchers at Budker INP and NSU include framework implementations, event displays, background simulations, track distortions, and gas medium simulations. Researchers like Andrey Sokolov, Lev Shekhtman, Vijayanand KV, and Timofey Maltsev have contributed significantly to these simulations, utilizing advanced tools like AURORA framework, FLUKA package, and GARFIELD++. The simulations provide insights into physics background, drift path distortions, gas medium characteristics, and gas avalanche dynamics in GEM detectors.

• TPC Simulation
• Budker INP
• NSU
• Gas Avalanche
• Simulation Techniques

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1. TPC Simulation Andrey Sokolov Budker INP - Novosibirsk State University

2. Participants Budker INP: NSU: Lev Shekhtman Vijayanand KV (PhD student) Andrey Sokolov Timofey Maltsev

3. AURORA simulation framework TPC is implemented in Aurora framework; We can now work with G4 hits only; Zero level RECO is exist it use the helix fit with a constant radius.

4. Aurora Event Display

5. Physics background simulation by Lev Shekhtman Simulation of background particles fluxes is performed with FLUKA package with FLAIR interface (http://www.fluka.org)

6. Simulation of the physics background by Lev Shekhtman TPC

7. Background in IT region by Lev Shekhtman The expected number of tracks from e+e- background are 50-100 within 6 s. It corresponds ~1000 bunch crossings.

8. Track distortion along drift path in Ne+10%CO2 by Timofey Maltsev 365 m Beam direction radial direction IP

9. Track distortion along drift path in Ar+10%CO2 1461 m by Timofey Maltsev Beam direction radial direction IP

10. GARFIELD++ simulation of the TPC gas medium by Vijayanand KV The Ar+CO (80:20), Ar+CF (90:10) and Ar+CH (90:10) look promising 2 4 4

11. GARFIELD++ simulation of the TPC gas medium by Vijayanand KV

12. Simulation of the gas avalanche in GEM by Vijayanand KV and Andrey Sokolov We started the 3D GEM simulation in order to estimate the size of the avalanche and ion back flow after quadruple GEM. After triple GEM the size of the avalanche already simulated by Timofey Maltsev. The of the avalanche is about 300 m.

13. Parametric simulation of the TPC spatial resolution by Andrey Sokolov Based on results of GARFIELD++ and HEED simulation; The main idea to estimate the TPC spatial resolution for different gas mixtures and readuot pad sizes; The algorithm will be used for the cluster digitization stage in Aurora framework.

14. Summary The TPC simulations are ongoing; The TPC geometry is implemented in Aurora framework; The default reconstruction is available; The background simulation is done; The ion back flow doesn t lead to strong distortions of the drift field. The track distortions can be compensated;

15. Outlook We have to implement the event mixer, pattern recognition and reconstruction to Aurora framework. We have to finalize the choice of the gas mixture and pad size.