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

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Oliver Aberle

on behalf of the Collimation team, special thanks to M. Cauchi, K. Weiss, R. Bebb and

J. 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 largedimensions.

• Concentratedaround 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)?

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