The geometry of the D1-D5 system with a small angular momentum j has a long
throat ending in a conical defect. We solve the scalar wave equation for l
ow energy quanta in this geometry. The quantum is found to reflect off the
end of the throat, and stay trapped in the throat for a long time. The leng
th of the throat for j = 1/2 equals n(1)n(5)R, the length of the effective
string in the CFT; we also find that at this distance the incident wave bec
omes nonlinear. Filling the throat with several quanta gives a 'hot tube' w
hich has emission properties similar to those of the near extremal black ho
le. (C) 2001 Published by Elsevier Science B.V.