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First results of the HRMT-09 tests on a LHC TCT collimator in HiRadMat
Collimation WG Meeting21.01.2013
Oliver Aberle
on behalf of the Collimation team, special thanks to M. Cauchi, K. Weiss, R. Bebb and
J. Lendaro
1Collimation WG Meeting28.01.2013
First visual inspection in B 867
2Collimation WG Meeting28.01.2013
• History can be found in Marija‘s presentation (CWG, 15.10.2012):Preliminary Results of TCT HiRadMat Tests
RP check before inspection (Kurt Weiss):Dose rate is the highest under thecollimator box, not in excess of 40 microSv/h @ contact.Contamination found, results available soon
First visual inspection in B 867
3Collimation WG Meeting28.01.2013
• History can be found in Marija‘s presentation (CWG, 15.10.2012):Preliminary Results of TCT HiRadMat TestsTest Intensity
[p]Number of bunches*
Beam Energy [GeV]
Energy on Jaw
[kJ]
TNT equivalent
[g]
BBA before Test 1
5.674 x1011 79 pilot 440
Test 1 3.2 x 1012 24 high-intensity
440 81.5 19.4
BBA after Test 1 1.5065 x 1011
18 pilot 440
BBA before Test 2
4.049 x 1011
35 pilot 440
Test 2 9 x 1011 6 high-intensity
440 22.9 5.46
BBA after Test2/before Test 3
2.32 x 1011 22 pilot 440
Test 3 9.34 x 1012 72 high-intensity
440 251.8 60.0
TOTAL 1.479 x 1013
356.2 84.9* Pilot bunch: ~ 5 – 10 x 109 ppb; High-intensity bunch: ~ 1.3 - 1.5 x 1011 ppb
4
Some pictures
– Downstream side clean (on first glance)
Collimation WG Meeting28.01.2013
– Particles and dust between jaws and behind RF fingers
Collimation WG Meeting 5
Some pictures
28.01.2013
• 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
• Upstream side
Spread droplets
Large lips of excessmetal
Collimation WG Meeting 7
Impact side - Upstream
• Debris of largedimensions.
• Concentratedaround the impact region.
• Some distantprojections?
28.01.2013
Collimation WG Meeting 8
Jaws opened
28.01.2013
• 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
Collimation WG Meeting 9
Left jaw
28.01.2013
34 mm
~ 3 mm
• Deposition from test 3
Collimation WG Meeting 10
Right jaw
28.01.2013
~ 4 mm
~ 2 blocks (400mm)
Collimation WG Meeting 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