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Reaching high densities is a key step towards cold-collision experiments withpolyatomic molecules. We use a cryofuge to load up to 2$\times10^7$ CH$_3$Fmolecules into a box-like electric trap, achieving densities up to10$^7$/cm$^3$ at temperatures around 350 mK where the elastic dipolarcross-section exceeds 7$\times$10$^{-12}$cm$^2$. We measure inelastic rateconstants below 4$\times$10$^{-8}$cm$^3$/s and control these by tuning ahomogeneous electric field that covers a large fraction of the trap volume.Comparison to ab-initio calculations gives excellent agreement with dipolarrelaxation. Our techniques and findings are generic and immediately relevantfor other cold-molecule collision experiments.

Electric-field-controlled cold dipolar collisions between trapped CH$_3$F molecules