The electron detector (ePC, ESC) is an independent detector block which should be moveable relative to the beam quadrupole (to allow easy access to its upstream detectors) as well as relative to the TPC. This latter motion has to be performed within 1mm accuracy, which is given by the radial distance between the outer diameter of the hydrogen vessel and inner diameter of the ePC1. The electron detector platform should also support the local ePC and eSC crates, so that the cabling remains intact during craning in and out of the detector.
Currently the support structure of the TPC is designed at PSI and PNPI. At UIUC the engineering design of the electron detector support structure has started. The two designs have to be carefully integrated.