tests on a fully assembled tct collimator in the hiradmat facility

Collimation Meeting 30.07.2012

Tests on a Fully Assembled TCT

Collimator in the HiRadMat Facility

M. Cauchi, D. Deboy,on behalf of the Collimation Team

OUTLINE

• Collimation-Related HiRadMat Tests in 2012

• Tests on a Fully Assembled TCT Collimator

Purpose & Type of Tests

Experimental Setup

Beam Parameters to be used

Details of Tests

• Microphones at HRM

Installation Layout

Purpose of Sound Analysis

2Collimation Meeting 30.07.2012

HiRadMat TESTS

Collimation-Related HiRadMat Tests in 2012 to be performed with high intensity beam

• HRMT-09: involving a Phase I Tertiary Collimator (TCTH) (w32: 06/08-10/08)

Motivation: to investigate the robustness of complete collimators in case of beam accidents

• HRMT-14: involving a series of material samples of simple geometrical shape

mounted on a multi-material sample holder (w44: 29/10-02/11)

Motivation: to assess the performances of different materials in extreme conditions


TESTS ON TCT COLLIMATOR

Purpose of tests on a fully assembled TCTH collimator

• Verification of robustness and integrity of metallic jaw collimators following direct beam impact

• Benchmarking of simulations

• Assessment of whether a collimator needs to be replaced following an accident during LHC operation



TCTH Collimator Jaw


• Jaw Material: Tungsten (INERMET 180)

• Support Material: Copper

• Jaw Skrews: Stainless Steel

• Total Length: 1 m + 0.2 m

• Two Jaws enclosed in vacuum tank

• 2 motors per Jaw for position + tilt

• 5th axis for vertical position(max: +/- 10 mm)


Experiment Instrumentation• 5x Stepper motors (with Resolver) : MACCON SM87.2.18MN Z280 ,

2A (LHC collimator type)

• 7x position sensors (LVDT) : Measurement specialties HCA2000 (LHC collimator type)

• 12x End-position switches: SAIA-BURGESS V3FN (LHC collimator type)

• 4x jaws temperature sensors: CAP IT PT100 ceramic sensor (LHC collimator type)

• 2x collimator tank temperature sensors: MINCO S100820PDXK100A Polyimide PT100.

• 2x water temperature sensors: CONDUSTRIE-METAG AG PT100 (LHC collimator type)

• 2x water pressure sensors: SENSORTECHNICS GMBH CTE9000 series (signal 4-20mA)

• 2x vacuum pressure sensors (Piranni / Penning HV) 6Collimation Meeting 30.07.2012


Control Application


FESA class and control Application was adopted for the HRM experiment(G. Valentino, A. Masi and Team)


HRM Layout

• TCTH Collimator pre-assembled on experimental table in BA7

• Quick Plug connections similar to LHC collimators

• Installation and Removal remotely with crane


Table 1 Table 2TCTH

Table 3

Beam direction


Beam Parameters• Beam-based collimator setup using low-intensity

bunches (pilot bunch with 5 x 109 ppb) – also for integrity check of Jaw surface after Test 1

• Collimator gap equivalent to TCLA gap (smallest gap representing most critical scenario) ~ 3.3mm

• Beam parameters for the irradiation tests: bunches of 0.5mm round beam at collimator jaw entrance face (beam size equivalent to beam size at TCTH location), 1.5 x 1011 ppb intensity, 440GeV

• Impact parameter: 2mm

• Approval of tests by RP (EMDS Document No.: 1211483)



Overview on Tests1. Test 1 – Design Error Case: Asynchronous beam dump in

operation or during collimator setup (with 1 nominal LHC bunch).

2. Test 2 – Low-Intensity shot just below damage limit to collect reference data to assess damage thresholds.

3. Test 3 – Disruptive Scenario for asynchronous dump (to be carried out only if it is shown that the results from Test 1 are not compromised).



Test 1 – Effects of Asynchronous Beam Dump

• Aim: investigate effect of an asynchronous dump involving the direct impact of 1 nominal LHC bunch on 1 collimator jaw

• A shot with about 20 high intensity HiRadMat bunches (1.5x1011 ppb at 440GeV) will be performed at jaw entrance face on Jaw 1 (FLUKA simulations by L. Lari confirmed same energy deposition peak)


5th axis down10 mm


Test 2 – Reference Shot below Damage Limit

• Aim: Further assessment of the damage threshold of the jaw material.

• Low-intensity shot (3-4 high intensity bunches at 1.5 x 1011 ppb at 440Gev) on Jaw 1

• Such impact will not evoke any beam-induced damage (maximum temperature expected to stay 80% below melting temperature of pure tungsten). Vertical jaw position to upper out-switch.


5th axis up10 mm


Test 3 – Disruptive Effects of asynchronous beam dump

• Aim: To benchmark simulation results presented at Chamonix against experimental results

• Simulation results anticipated that 4 LHC bunches (1.3 x 1011 ppb) at 5TeV on a TCT would cause jaw damage together with severe plastic deformations on the cooling pipes

• FLUKA simulations by L. Lari showed we need around 50 bunches with 1.5 x 1011 ppb at 440GeV to be equivalent to this case

• Jaw 1 will be taken out completely for this test.


5th axis up10 mm


Summary


Test Beam intensity

Test 1 3 x 1012 p

Test 1 ~ 6 x 1011 p

Test 2 7.5 x 1012 p

Post-irradiation Inspection (visible inspection using a

camera)Jaw damage extent

Material projection

Metrology of the jaw

Other visible inspection

Direct MeasurementsVacuum Pressure

Water Pressure

Temperature

Microphone signal

• Further manual analysis after necessary activation cool-down period (t.b.d.)

Beam Parameters

440 GeV Protons

1.5 E11 ppb

0.5 mm x 0.5 mm


Schedule


Vacuum and Instrumentation test Pre-Assembly on Experimental table in BA7 Control and Data Logging• Installation in HRM experimental area – W31 (this week)• Tests at HRM – W32• Storage (behind HRM Beam Dump) – W33 for at least 4

months

MICROPHONES AT HRM

Installation Layout

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• Microphone Up- and Downstream for signal correlation (estimate location of impact)

• BackUp Microphone ca 30m Upstream at PatchRack

• Hydrophone (taken from LHC installation) – Underwater microphone in air, R2E test of sensor


MICROPHONES AT HRM

Purpose of Sound Analysis

• Can we (roughly) localize Impacts with correlation measures between two or more microphone signals?

• Sound Pressure Level -> Amplitude of pressure wave

• Spectral Components -> Damage/ no damage?

• Investigate limitations of the system (EM noise, R2E)

Application:

Impact detection and localization at LHC collimators!


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REFERENCES

• R. Assmann, A. Bertarelli, A. Rossi, “Requirements for 2012 Tests on Fully Assembled Collimators and on Collimator Material Samples in the HiRadMat Facility”, EDMS No. 1178003, LHC-TC-ES-0004.

• A. Bertarelli et al., “Limits for Beam Induced Damage: Reckless or Too Cautious?”, Proceedings of Chamonix 2011 Workshop on LHC Performance.


tests on a fully assembled tct collimator in the hiradmat facility

Documents

tct collimatorpurpose

team tests

collimator gap equivalent

mmapproval of tests

irradiation tests

cerca collimation meeting

jaw material

tertiary collimator