1. First results of the HRMT-09 tests on a LHC TCT collimator in HiRadMat Collimation WG Meeting 21.01.2013 Oliver Aberle on behalf of the Collimation team, special thanks to M. Cauchi, K. Weiss, R. Bebb and J. Lendaro HRMT-09 1 Collimation WG Meeting 28.01.2013

2. First visual inspection in B 867 2 Collimation WG Meeting 28.01.2013 History can be found in Marija‘s presentation (CWG, 15.10.2012): Preliminary Results of TCT HiRadMat Tests Preliminary Results of TCT HiRadMat Tests RP check before inspection (Kurt Weiss): Dose rate is the highest under the collimator box, not in excess of 40 microSv/h @ contact. Contamination found, results available soon

3. First visual inspection in B 867 3 Collimation WG Meeting 28.01.2013 History can be found in Marija‘s presentation (CWG, 15.10.2012): Preliminary Results of TCT HiRadMat Tests Preliminary Results of TCT HiRadMat Tests TestIntensity [p]Number of bunches* Beam Energy [GeV] Energy on Jaw [kJ] TNT equivalent [g] BBA before Test 15.674 x10 11 79 pilot440 Test 1 3.2 x 10 12 24 high-intensity440 81.519.4 BBA after Test 11.5065 x 10 11 18 pilot440 BBA before Test 24.049 x 10 11 35 pilot440 Test 2 9 x 10 11 6 high-intensity440 22.95.46 BBA after Test2/before Test 3 2.32 x 10 11 22 pilot440 Test 3 9.34 x 10 12 72 high-intensity440 251.860.0 TOTAL 1.479 x 10 13 356.284.9 * Pilot bunch: ~ 5 – 10 x 10 9 ppb; High-intensity bunch: ~ 1.3 - 1.5 x 10 11 ppb

4. Some pictures –Downstream side clean (on first glance) 4 Collimation WG Meeting 28.01.2013 –Particles and dust between jaws and behind RF fingers

5. Some pictures 28.01.2013 5 Loose particles, fragments and droplets of different sizes. Distribution could have been modified by transportation and manipulation. (Note: Jaws have been moved prior to inspection) Collimation WG Meeting

6. Impact side - Upstream 28.01.2013 6 Upstream side Spread droplets Large lips of excess metal Collimation WG Meeting

7. Impact side - Upstream Debris of large dimensions. Concentrated around the impact region. Some distant projections? 28.01.2013 Collimation WG Meeting 7

8. Jaws opened 28.01.2013 Collimation WG Meeting 8 Jaw opened to full retracted position (switches). Projections from impact towards top and bottom plate (from test 3 towards opposite jaw). Vaporisation deposit around molten region. Test 1 Test 2 Test 3

9. Left jaw 28.01.2013 Collimation WG Meeting 9 34 mm ~ 3 mm Deposition from test 3

10. Right jaw 28.01.2013 Collimation WG Meeting 10 ~ 4 mm ~ 2 blocks (400mm)

11. Next steps Results from smear test to quantify and qualify contamination. Cross check the beam and impact parameters and compare with simulations. Better estimate of dimensional extent of visible damage. Possibility of inserting tools? Access to the tungsten blocks, open the box? Collaboration with external partners (e.g. PSI)? 28.01.2013 Collimation WG Meeting 11