We haven't clearly defined the fiducial region of the detector. In some places, we talk about the seven central modules as the fiducial modules, but clearly we need to fiducialize in the vertical and beam dimensions as well. Should we simply decide on a fiducial cut to apply from all edges of the detector? Do we fiducialize each module separately?
We have a crude upper limit on event size. Jamie points out that this is quite important and wonders if a toy simulation could give a more realistic diea of the event size, or if we could make an estimate based on existing experiments.
Should we consider a scintillator veto system at the upstream end of the detector?
The desired efficiency and purity stated in section 2.2 seem somewhat arbitrary. Can we provide some justification for these numbers?
Is a thermal analysis of the cryostat with the foam possible (to justify heat leak numbers)? This is probably more than we can do for the tech note, but is something to think about in future.
The section on the hadron calorimeter is lacking detail: How many interaction lengths deep should this be? What is the target resolution for hadronic shower energy and muon momentum?
Might be interesting to comment on what margin in the muon background rate the system is designed for. Would the current design work at 2 Hz/cm^2? What would the limitation be? Etc.