Outlook

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F. Carra – EN-MME 1

TCSP and TCAPD:Status of EN/MME production

Collimation Working Group 03.02.2014

F. Carra, A. Bertarelli, A. Dallocchio, M. Garlasché, L. Gentini, I. Sexton

…and many other people working on these projects

3 February 2014

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F. Carra – EN-MME 2

TCAPD production

TCSP production

Status

Vacuum issues

Conclusions

Outlook

3 February 2014

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F. Carra – EN-MME 3

First planning: deliver two TCAPDs to EN/STI by the end of 2013

2 months of delay in the raw material (copper) procurement, almost entirely absorbed thanks to a crash program

Two TCAPDs completed on 16th January 2014, including:

Machining EB welding Metrology Final mechanical assembly of the support

structures (ancillary supports included) TCAPDs transported to b. 272 (EN/STI) for the

final tests (bake-out, vacuum, etc.)

TCAPD Production

3 February 2014

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F. Carra – EN-MME 4

TCAPD Production

3 February 2014

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F. Carra – EN-MME 5

3 TCSP collimators to be produced (2 to be installed + 1 spare) Delays for the production coming from BPM cables. High outgassing rate due to

cracks in the weldings between cables and connectors (discovered in December 2011) Problem solved by the supplier with the help of CERN material and welding experts,

but TCSP cables shipped to CERN only in July 2013 and provided to EN/MME after testing in September 2013!

Collimators ready for EN/STI on the third week of November, thanks to a big effort from all the people involved!

EN/STI final operations and bake-out completed by mid-January

TCSP Production

3 February 2014

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F. Carra – EN-MME 6

TCSP Production

3 February 2014

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F. Carra – EN-MME 7

Vacuum issues

2 TCSP tested after bake-out: both are vacuum-tight and without contamination

Outgassing test: the first is compliant with LHC specification, the second one is above the outgassing limit and cannot be installed as it is

The test has been repeated three times, and the results are confirmed, even if the outgassing rate has decreased each time

According vacuum experts, this could be due to internal leaks: it can be related to the connection BPM cables / flange (absence of outgassing hole in the connector)

TCSP Production

3 February 2014

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F. Carra – EN-MME 8

What’s next?

The third TCSP is now being vacuum-tested, to possibly replace the second one: results expected by the end of week 6. A BPM flange had to be replaced because it was leaking! (2nd time we find a leaking BPM flange…)

In parallel, vacuum tests on TCSP n. 2 are going on (to assess if the outgassing be related to the BPM connections with the flange)

Can we think about a long pumping and bake-out cycle (or multiple bake-outs) to decrease the outgassing down to LHC specification?

The problem of trapped air inside the BPM connector has to be taken into account also for the TCTP series!

Proposal: electro-erosion cutting on BPM connector

TCSP Production

3 February 2014

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F. Carra – EN-MME 9

Conclusions

3 February 2014

TCAPD: machined, delivered and currently under bake-out and vacuum tests

TCSP:

Machined, delivered to EN/STI, vacuum-tested

TCSP n. 1 OK, TCSP n. 2 outside LHC specification, TCSP n. 3 (spare) under testing

Tests on TCSP n. 2 ongoing to understand the origin of the problem and proposals to cope with it under examination

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F. Carra – EN-MME 10

Thank you for your attention!

3 February 2014

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F. Carra – EN-MME 11

Backup slides

3 February 2014

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F. Carra – EN-MME 12

Ongoing EN/MME activities on collimators

3 February 2014

Actuation system: New cycling tests on movable tables with more realistic cycle Analyses on the failures of SKF roller screws Qualification of a new actuation system (hybrid steel/ceramic ball screws –

UMBRA)

Advanced materials: sistemarle Tests in Eucard2 WP11 Design of TCSx HiRadMat2 Analyses of HiRadMat1 results

BBLRC Preparation of Phase II prototype for impedance measurements TCTP proto TCLD?

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TESTS ON ALTERNATIVE COATINGS

3 February 2014 F. Carra – EN-MME 13

The black coating used for radio tube anodes has been taken in consideration: Very high emissivity, measured with the thermal camera: 0.9 Even more volatile surface than CrO, easily detachable by hand!

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F. Carra – EN-MME

TESTS ON BLACK CHROME

Black Chrome

Graphite

14

Outgassing tests of the black chrome have been performed by G. Cattenoz (EDMS n.1213905): High outgassing rates, but within the limits for LHC vacuum Dusty surface (risk of particles detachment) A SEM observation was performed by N. Jimenez Mena to compare morphology and porosity of

Black Chrome and Graphite (EDMS n. 1220547). “The Cr coating shows many cracks and some inhomogeinities on the surface. However, the porosity and discontinuities in the graphite reference seem to be higher.”

3 February 2014

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F. Carra – EN-MME 15

THERMAL SIMULATIONS: RESULTS Results showed in slide 7 have been updated with the realistic inputs presented by H. Day (no

safety factor considered in this case)

To be divided by 2 to evaluate power on each

ferrite array

3 February 2014