When the target was removed from the test stand it was discovered that the custom designed insulator stand-off (ITD0400 made from Mycroy 1100) had swollen and become discoloured in the area exposed to "heat shine" from the target oven. See attached pdf for photos of the insulators.

The heat shield lid was opened up and the target temporarily removed to replace the two insulators that had failed. These were replaced with the commercially available glazed steatite stand-offs. The target had some marks from the insulators which was cleaned with acetone and methanol.

After replacing the insulators, the target assembly was assembled, leak checked and a new electrical check was performed.

Additional photos are available on DocuShare