How might a second detector differ in technology choices and what (dis)advantages might that bring in terms of kinematic coverage, resolution on reconstructed variables, radiation hardness, dominating systematics etc?
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Are there wider implications for other parts of the detector - eg due to material budgets?
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Would the complementary designs naturally be associated with different choices of solenoid field, centre of mass energy, luminosity or beam polarisation?
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Are there any limitations in the performance of your sub detector technologies for very small bunch spacing < 9ns
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Are there any rate limitations?
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Is +/- 4.5 m enough longitudinal space to fit the detector
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Are there any issues we should be aware of in terms of cost, technology readiness, or time required to construct the detector?
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Might it be possible to combine more than one function into your detector(s)?
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Do your detector technologies have any impact on the design of the interaction region?
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What studies need to be done (or have been done already) to make fully quantitative statements?