Recent Developments in Ring Closure and Modeling in BDSIM
Explore the latest updates in ring closure modeling and analysis in BDSIM, including comparative cross-section and twiss function plots. Understand the issues related to ring closure and precision in the BDSIM model with insights from L. Nevay and the research team.
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Presentation Transcript
BDSIM Update L.Nevay, S.Boogert, S.Gibson, R.Kwee-Hinzmann 21stFebruary 2014
Recent Work Addressing previous ring closing issue discussed here Implementing ring turn control Comparative cross-section plots Comparative twiss function plots underway, results soon 12 June, 2025 L.Nevay 2
Ring Closure BDSIM model generated from thick MadX optics Previously ring didn t close by ~100um in X & Y Further investigation shows this is not BDSIM Working precision of MadX is 9sf 26500m -> resultant error O(10^-4) Increasing working precision does not improve Most component s length is defined to ~5sf Is this inherent to the model? Unrealised / acceptable as no one works in Global coords? apart from BDSIM 12 June, 2025 L.Nevay 3
MadX Survey With high working precision set, format= 15.20e Use MadX survey command Similar to BDSIM and independent C++ calculation of length + angle. MadX survey output: Mismatch in MadX input to BDSIM Our use of optics? or inherent and acceptable? 12 June, 2025 L.Nevay 4
