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goal is to prepare fastsim for the upgrade of the pixel detector. A new, configurable interface for the geometry of the fastsim tracker was developed. To this end, it was necessary to also write a new algorithm for the propagation of the particles inside the tracker.\r\nThe geometry of the detector used to be hard-coded but can now be specified in a single python file (FastSimulation/Geometry/python/TrackerMaterial_cfi.py)\r\n\r\nMotivation for a new algorithm (particle propagation inside the tracker)\r\n- almost impossible to adjust the old algorithm to the new, configurable geometry (hard-coded links have to be omitted)\r\n- old algorithm is flawed\r\n- the new algorithm allows to put material and instruments on any plane perpendicular to z, or on any cylinder with the z-axis as axis\r\n- while the old algorithm, with the requirement of nested layers, forbids the introduction of long narrow cylinders, required for a decent simulation of material in front of HF\r\n"},"comment":{"url":"https://api.github.com/repos/cms-sw/cmssw/issues/comments/335498143","html_url":"https://github.com/cms-sw/cmssw/pull/20666#issuecomment-335498143","issue_url":"https://api.github.com/repos/cms-sw/cmssw/issues/20666","id":335498143,"user":{"login":"kpedro88","id":4672808,"avatar_url":"https://avatars0.githubusercontent.com/u/4672808?v=4","gravatar_id":"","url":"https://api.github.com/users/kpedro88","html_url":"https://github.com/kpedro88","followers_url":"https://api.github.com/users/kpedro88/followers","following_url":"https://api.github.com/users/kpedro88/following{/other_user}","gists_url":"https://api.github.com/users/kpedro88/gists{/gist_id}","starred_url":"https://api.github.com/users/kpedro88/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/kpedro88/subscriptions","organizations_url":"https://api.github.com/users/kpedro88/orgs","repos_url":"https://api.github.com/users/kpedro88/repos","events_url":"https://api.github.com/users/kpedro88/events{/privacy}","received_events_url":"https://api.github.com/users/kpedro88/received_events","type":"User","site_admin":false},"created_at":"2017-10-10T14:49:43Z","updated_at":"2017-10-10T14:49:43Z","author_association":"CONTRIBUTOR","body":"-1\r\n@skurz this PR needs to be fixed. Do not use cms-merge-topic to update a PR. Please follow http://cms-sw.github.io/tutorial-resolve-conflicts.html#recovering-from-a-bad-rebase-or-merge to undo what you did, and then follow the rest of the tutorial on that page to update your PR correctly."}}
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