Plans for a Simulation Study of the Magnetic Field Requirements of the LC TPC February 2006, ILC TPC Analysis Jamboree, DESY Christian Hansen University.

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Presentation transcript:

Plans for a Simulation Study of the Magnetic Field Requirements of the LC TPC February 2006, ILC TPC Analysis Jamboree, DESY Christian Hansen University of Victoria Jason McGeachie University of Victoria Dean Karlen University of Victoria and TRIUMF

Objectives ILC’s crossing angle will cause magnetic field distortions Corrections for the inhomogeneous magnetic field will be needed for TPC’s required momentum resolution ( d(1/p) ~ GeV -1 ) Two ways to correct for magnetic field distortions; –a B-field map giving a first approximation –external data points (e.g. from the vertex detector) Back of the envelope estimations on the possible accuracy of these corrections have been done ( see Snowmass 2005 talks by Ron Settles and Don Peterson ) A simulation study is needed to determine the –influence of an inhomogeneous magnetic field on TPC’s momentum resolution and the –possibility for magnetic field corrections to the reconstruction

Strategy Edit Mokka’s TPC to include –Drift electrons –GEM foils –Gas gaps –Endplate Pads Study extra distortion of drift electrons and the effect on reconstruction Work in progress!

Mokka installation Installations done on two different system Scientific Linux 3 (SL3) and Fedora Core 4 (FC4) Installed needed software CLHEP, Wired, OpenGL, Geant4, MySQL... Installed LCIO Had to add an include statement due to new gcc version in FC4 Installed Mokka Had to create shared libraries and edit files for compile and link Created Local Mokka MySQL Database To be able to define our own Sub Detector Installed Gear and linked it inside Mokka Upgraded the implementation of Gear to define the TPC pads Installed Marlin and CED (C Event Display) Details described step by step:

New TPC Definition in Mokka Added a new TPC in a Local Mokka MySQL Database (heplw08.phys.uvic.ca) Built on Tesla/TPC03 No gas layers TPCUVic01.hh/cc

Ionization in Mokka’s TPC Control stepsize for ionizating particles in the TPC gas E.g. 1mm G4 gives the energy loss for that step eV/mm One electron cloud per step Number electrons per cloud is given by the energy loss from G4 (26 eV/e - ) ElectronCloud.hh/cc TrkSD01.hh/cc

Cloud Transportation First approach; homogenous fields in drift volume –The clouds are transported with one step to the first GEM –Parameterized diffusion of the e - Later approach; Inhomogeneous magnetic field –The clouds will be transported with several steps to the GEM –In each step a field map will be used to get the Lorentz angle ElectronCloudTransport.hh/cc For the GEMs; Parameterized Gain, Collection and Extraction efficiency Transportation through gas gaps as for the drift volume Will this narrow area be effected by inhomogeneous magnetic field? Drift Volume End Plate

Pad hits in GEAR The pad geometry is specified in a GearXML file Electrons that hit the pad plane are assigned to pads ReadoutPadSD01.hh/cc In the same class pulse shapes will be created

Upgrade of GEAR A New type of pad layout geometry for the TPC is implemented The geometry can now be described in the XML file either by describing each row...

Upgrade of GEAR Then the output shows the four rows as described in the XML file example above

Upgrade of GEAR The geometry can also be described as using a pattern...

Upgrade of GEAR The output shows the 16 rows defined by the pattern Available at

Conclusions and Future Work More info here: Web Strategy Make a more detailed TPC simulation in Mokka Study what effect inhomogeneous magnetic field has on the momentum resolution of the LDC concept Study possibility to correct for field distortions with either a B-field map or external track points Objective Simulation is needed to understand the LC TPC’s magnetic field requirements and possible corrections for the magnetic field distortions Installation Installation of Mokka, LCIO, Gear and Marlin has been done on SL3 and FC4 –Not trivial