After removal of the leaky target cassette at position 3, plugs were installed on the target ladder and a leak check was performed.  With the target pumped down to approximately 10 mTorr, and helium detector gauge baseline of 9 on the 10X scale, a response of up to 25 on the 500X scale was observed when leak checking the right side delta seal on the lower face of the upper slide plate using a standard 1s spray of helium at 3 psi.  The flange screws were tightened and the leak check repeated.  Under the same conditions there was a response of up to 60 on the 100X scale - There was still a leak, but not as severe as before.  The screws were tightened further, and the target leak checked again, with no change.

At time of installation a response of  up to 10 on the 100X scale was found at the same location.  This target was found to be water leak tight and was used in  the beam line for ~4 months.  It is possible that the seal is still water leak tight.

The seal must be replaced or a static water test performed to show that the target is water leak tight.  Seal replacement will take approximately 2-3 days.