1. Claudio Bortolin – CERN

2. Y. Lesenechal started some tests last week (drill, twisted wire and a lot of patience): Ø ~ 1,2 mm Twisted wire + carbide drill bit welded on the head Metal swarf found only upstream the filter

3. The procedure has the be improved: To tune the force applied to the filter (the twisted wire can be broken inside the pipe) To test the cleaning effect using C6f14 and the cleaning machine in counter flow (or aspiration after the drilling using peek mini-pipes…) To reproduce the results many times in order to optimize the tools To drill the filters in the lab many times in order to find a precise procedure To measure the pressure drop after the drilling

4. The drilling procedure can be finalized in DSF: Using the counter flow cleaning while drilling measuring the pressure drop after the operation Clogged with glue but the hole

5. Laser Material Processing AG (Lyss –Switzerland) started some test on a small mockup. 1) too early to have a trustworthy result: the matter is how to bring the power through the bane at 80º (R=13 mm); the first test was not satisfying 2) The company is starting a new test and within this week I could have the result If the power of the signal after the bend is enough they can optimize the design of the lens (cost to be considered) Latest news: Rosario Turrisi found an Italian company that can provide the optical fiber and the equipment necessary for the visual inspection inside the pipe before and after the drilling operation. Delivery time is about 10 days.