Page History

...

SLIC crashes on approximately 1 in a billion events. This bug is believed to be resolved in v7.

HPS-

...

EngRun2015-[SVTPosition]-v0 

First version of engineering run geometry.  The SVTPosition is either "Nominal" (+/- 1.5 mm to active sensor) or "Open" (+/~ 7mm to active sensor). 

• Based on HPS-Proposal2014-v9
• B-field is box dipole of By=-0.25T  (applicable for 1.1 GeV)

HPS-ECalCommissioning-V3 (with and w/o fieldmap)

Official geometry for the Decembers 2014 ECal commissioning run

• As designed ECAL with asymmetric top/bottom gaps
• no SVT!
• B-field of -0.33T (in y)

Working geometry for 2014 run studies. Changes will be announced on the hps-software list; you should rerun SLIC on all your data after any change since old data may not work with up-to-date versions of readout sim/analysis/reconstruction.

• SVT rotated 30.52 mrad around target; single sensors for layers 1-3, double sensors with double readout (unganged) for layers 4-6
• ECal flange face at z=1318 mm and photon hole aligned at 30.52 mrad from target
• Front face of ECal crystals is z=1393 mm; ECal aligned so the 30.52 mrad photon beam intersects centerline of ECal at its front face
• All dead material defined using Geant4 primitives: SVT vacuum chamber, ECal flange and vacuum chamber (with honeycomb)
• Uniform magnetic field extending from z=-8.28 to 99.72 cm
• Vacuum (zero density) planes at z=15 cm, same shape as standard SVT layers; hits are saved for charged particles passing through these planes (for use in recoil electron studies)
• Vacuum (zero density) planes at magnetic field boundaries; hits are saved for all particles passing through these planes
• Vacuum (zero density) planes just downstream of the ECal flange; hits are saved for all particles passing through these planes

HPS-Proposal2014-v8 (three versions with different B-fields)

• Based on HPS-Proposal2014-v7
• Added the ECAL crystal support structure in front of the crystals.
• Added the ECAL cooling plates and pipes.

HPS-Proposal2014-v9-2pt2

• HPSTracker2014 geometry type with millipede-friendly parameters

HPS-TestRun-v3

Official geometry for 2012 test run as-built.

...