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Tests on a Fully Assembled TCT Collimator in the HiRadMat Facility

Tests on a Fully Assembled TCT Collimator in the HiRadMat Facility. M. Cauchi, D. Deboy , o n 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

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Tests on a Fully Assembled TCT Collimator in the HiRadMat Facility

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  1. Tests on a Fully Assembled TCT Collimator in the HiRadMat Facility M. Cauchi, D. Deboy, on behalf of the Collimation Team

  2. 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

  3. 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

  4. 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

  5. TESTS ON TCT COLLIMATOR TCTH CollimatorJaw • 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)

  6. TESTS ON TCT COLLIMATOR 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)

  7. TESTS ON TCT COLLIMATOR ControlApplication FESA class and control Application was adopted for the HRM experiment (G. Valentino, A. Masi and Team)

  8. TESTS ON TCT COLLIMATOR HRM Layout • TCTH Collimator pre-assembled on experimental table in BA7 • Quick Plug connections similar to LHC collimators • Installation and Removal remotely with crane Beam direction Table 3 Table 2 TCTH Table 1

  9. TESTS ON TCT COLLIMATOR Beam Parameters • Beam-based collimator setup using low-intensity bunches (pilot bunch with 5 x 109ppb) – 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)

  10. TESTS ON TCT COLLIMATOR Overview on Tests • Test 1 – Design Error Case: Asynchronous beam dump in operation or during collimator setup (with 1 nominal LHC bunch). • Test 2 – Low-Intensity shot just below damage limit to collect reference data to assess damage thresholds. • 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).

  11. TESTS ON TCT COLLIMATOR 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 down 10 mm

  12. TESTS ON TCT COLLIMATOR 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 up 10 mm

  13. TESTS ON TCT COLLIMATOR 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 up 10 mm

  14. TESTS ON TCT COLLIMATOR Summary • Further manualanalysis after necessary activation cool-down period (t.b.d.)

  15. TESTS ON TCT COLLIMATOR 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

  16. MICROPHONES AT HRM Installation Layout • MicrophoneUp- and Downstream forsignalcorrelation (estimatelocationofimpact) • BackUpMicrophoneca30m UpstreamatPatchRack • Hydrophone (takenfrom LHC installation) – Underwatermicrophone in air, R2E testofsensor

  17. 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!

  18. 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.

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