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Software Support for the Beam Test

Software Support for the Beam Test. Leon R. (Originally: 1 December ‘05) (revised 22 June ’06). First Things First. A fairly detailed run plan is due in a very short time (“end of next week” is being bandied about!).

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Software Support for the Beam Test

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  1. Software Support for the Beam Test Leon R. (Originally: 1 December ‘05) (revised 22 June ’06)

  2. First Things First A fairly detailed run plan is due in a very short time (“end of next week” is being bandied about!). To support this, we want to have a reasonably realistic simulation in place. We need to: • Provide a CU (Calibration Unit) geometry • Interface beam and Gleam • Deal with multiple input particles per event

  3. Strategy: Divide and Conquer

  4. 4-Tower CU z y x

  5. CU in beamline DOF of XY table y Wrong!See next slide! y x = x0 beamline x z z x In CU coordinate system,incoming particles along z axis plane for reporting initial particles (in beamline coordinates)

  6. CU on the Beamline DOF of XY table z = z0 z x x = x0 beamline y x z y In CU coordinate system,incoming particles along z axis plane for reporting initial particles:(x0in beamline coordinates)(z0in CU coordinates) Leon Rochester 6/22/06

  7. Rotated CU in beamline y y Wrong!See previous slide! z beamline x z x Rotated CU Incoming particles at an anglein the x-z plane

  8. Benoit’s Beam MC Possible setup for the CERN Bremsstrahlung beam Current MC produces a text file of particle parameters… not very convenient for Gleam

  9. CU Geometry: First Draft what about the XY table? Thanks Anders!

  10. Then, Subdivide and Conquer Tasks: • Modify Benoit’s program to produce a McParticleCol instead of a text list • Enhance Gleam input functionality to: • read in more than one particle per event • rotate and translate event corresponding to positioning of CU • Enhance G4Generator and downstream code to process multiple particles

  11. Modify Standalone MC Heather has taken on this job. • She has Benoit’s code partially running on the norics. • The program uses G4 libs that are not needed for GR or EM, so some infrastructure work needs to be done, in particular, a new extlib for the extra libs, to keep them away from GR! • When this is done, she will CMT-ize the code and put it in cvs. • Finally, the code will be modified to produce mc.root files. (This is the easy part! [We hope!] )

  12. Tentative format of the Event Each event contains an McParticleCol containing an initial “particle” and one or more daughters. • The daughters are the actual particles produced by the beam • The initial particle is a fake, whose 4-momentum is the sum of the 4-momenta of the daughters, and whose position is on the beam line at the reporting plane. I’ve made a little toyroot file which may be useful to test the Gleam changes… probably need to iterate.

  13. Enhance Gleam Input: Toby has started working on this. The job appears to be straightforward. • A new algorithm will apply rotations and translations as specified in the jobOptions file. G4Generator: Tracy is doing this part. He’s nearly ready to try out his changes on a real input file.

  14. Updated Update6 December ‘05 Lot’s of activity! I think we’re on track for the end of this week. • Heather is creating a CMT package with the G4 pieces needed to run Benoit’s code. (turning out to be harder than we had hoped…) • We found a RootIo bug that double the number of entries in the mother particle’s daughter list. (Fixed in cvs.) • Toby is ready to test the coordinate transformation on “real” MC particles. • Tracy has modified G4Generator to accept multiple particles, and is working his way downstream. (See next slide…) • Philippe is adding ACD tiles to the CU model. (Help from Heather and Joanne) He’s uncovered some bugs in how HepRepSvc (?) rotates volumes.

  15. A mu+ and mu- swum through the LAT!

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