First results of the HRMT-09 tests on a LHC TCT collimator in HiRadMat

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Oliver Aberleon behalf of the Collimation team,

special thanks to M. Cauchi, K. Weiss, R. Bebb andJ. Lendaro

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First visual inspection in B 867

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• 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

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• 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)

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– Particles and dust between jaws and behind RF fingers

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Some pictures

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• 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)

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Impact side - Upstream

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• Upstream side

Spread droplets

Large lips of excessmetal

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Impact side - Upstream• Debris of large

dimensions.• Concentrated

around the impact region.

• Some distantprojections?

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Jaws opened

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• 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

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Left jaw

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34 mm

~ 3 mm

• Deposition from test 3

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Right jaw

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~ 4 mm

~ 2 blocks (400mm)

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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