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Documentation:
HPS Beamline Commission Document v1 October 20, 2014 HPS beamline commissioning document v1.0.docx
Beamline Alignment with magnets at 95in. separation:beamline_Mar032014.pptx
Beam trajectory through pair spectrometer magnet , from simulation.
Engineering drawings of beamline and components: https://userweb.jlab.org/~zarecky/Dark%20Matter%20file%20directory.htm
7/26/2011 slides from Stepan including plan and survey positions of vacuum chamber: BeamLine_updates.pptx
Beamline photos are available: Beamline.pptx
See Calorimeter for ECal-specific docs.
Presentation of Beamline update at Wednesday morning, 27 March 2013, meeting Beamline 27 March 2013.ppt
ECal vacuum flange: beam gap vacuum chamber, honeycomb
Fieldmaps:
The magnetic field map used for simulation and reconstruction is derived from TOSCA simulations combined with PRIMEX measurements of the fringe fields. The procedure is described here.
These files are then converted into a format appropriate for the slic simulation program and the hps-java reconstruction code using the following prescription.
First, determine the field setting for the energy of the beam.
Find the closest fieldmap calculation in the above list and determine the scaling factor to bring the central value of the fieldmap into accord with the desired setting.
Scale, unfold and convert units of the txt file into a file which can be used by slic and hps-java using the following command:
java ~/.m2/repository/org/hps/hps-distribution/3.11-SNAPSHOT/hps-distribution-3.11-SNAPSHOT-bin.jar org.hps.util.UnfoldFieldmap < fieldmap > < scaling factor >
The resulting file, out.dat, should be renamed to preserve the provenance, e.g.
125acm2_3kg_corrected_unfolded_scaled_0.7992.dat (1.056 GeV running)
209acm2_5kg_corrected_unfolded_scaled_1.04545.dat (2.3 GeV running)
The fieldmaps are archived at http://www.lcsim.org/resources/hps/fieldmap/
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