1. TRT Leak Repair Anatoli Romaniouk, 05.06.2013 1

2. EC leak tests Side C Side A 2

3. 3 EC wheel type A connectivity Electronics Gas manifold Gas Straws/radiator Electronics Gas manifold Gas Straws/radiator Gas IN Gas OUTPEEK pipes shown in pink Places of stress

4. Repair at the detector level Nut PEEK pipe Most probable places of leaks Insert Steel pipe Polyurethane joint Connector Removable steel road

5. 5 Repair status TRT WheelRepair and testsComments A1Done, failed A2Done, OKLeak fixed A3Done, OKLeak fixed A4Done, failedLarge, Repair is OK but leak in the other place A5Done, OKNo leak before A6Done, partially failedLeak reduced but still large. Repair is OK but there is still leak in the other place B1Done, OKNo leak before B2Done OKNo leak before B3Done, failedLeak still at the level of 2.5 l/h (can be controlled) B4Done OKLeak was small, now no remarkable leak B5Done, failedLeak still at the level of 0.25 l/h (can be controlled) B6Done, OK B7Done, OK B8Done, OK

6. 6 Side A. B3 OUT F 16 1155 mm Ch. 9 NO Leak B4 OUT F 18 1033 mm Ch. 1 0 No Leak B5 OUT F 20 910 mm Ch. 11 Leak 9 l/h B6 OUT F 22 788 mm Ch. 12 No Leak B7 OUT F 24 665 mm Ch. 13 No Leak B8 OUT F 26 543 mm Ch. 14 No Leak A1 OUT F 28 2388 mm Ch. 1 NO Leak A2 OUT F 1 2099 mm Ch. 2 NO Leak A3 OUT F 3 1963 mm Ch. 3 Leak 0.06 l/h A4 OUT F 5 1814 mm Ch. 4 Leak 0.8 l/h A5 OUT F 7 1673 mm Ch. 5 Leak 0.3 l/h A6 OUT F 9 1526 mm Ch. 6 Leak 4 l/h B1 OUT F 11 1400 mm Ch. 7 Leak 75 l/h B2 OUT F 13 1278 mm Ch. 8 No Leak

7. 7 Side A: different design for connectors on the detector (has been assembled after lessons from side C) Close to the detector pipes are glued to the plastic connector. That was the reason why the leaks on side A appeared later than on side C.

8. 8 But still there are places with stress It might be crack in the pipe (most likely just a defect)

9. 9 The bigest problem the bracket regions Cracks in the pipes

10. 10 Now environment inside of the pipe is the same but technique should be adopted to this design. There are 4 tubes which have larger wall thickness -> even endoscope cannot go inside. Preventive repair: isolate bracket region from ozone installing 3 mm pipe deep behind of brackets.

11. 11 Next steps (side A): 3 lines repaired. 7 more will be repaired today Repair of the remaining 4 with smaller inner diameter will be tested tomorrow. Hopefully will be repaired in Fr. Leak tests will continue may be Mo.-Tu. On We. - Th. we will look for faulty connections at PPF1 Th.-Fr. Close side A.