1. 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

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 2 Collimation Meeting 30.07.2012

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 3 Collimation Meeting 30.07.2012

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 4 Collimation Meeting 30.07.2012

5. TESTS ON TCT COLLIMATOR TCTH Collimator Jaw 5 Collimation Meeting 30.07.2012 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 5 th 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) 6 Collimation Meeting 30.07.2012

7. TESTS ON TCT COLLIMATOR Control Application 7 Collimation Meeting 30.07.2012 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 8 Collimation Meeting 30.07.2012 Table 1 Table 2 TCTH Table 3 Beam direction

9. TESTS ON TCT COLLIMATOR Beam Parameters Beam-based collimator setup using low-intensity bunches (pilot bunch with 5 x 10 9 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 10 11 ppb intensity, 440GeV Impact parameter: 2mm Approval of tests by RP (EMDS Document No.: 1211483) 9 Collimation Meeting 30.07.2012

10. TESTS ON TCT COLLIMATOR Overview on Tests 1.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). 10 Collimation Meeting 30.07.2012

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 (1.5x10 11 ppb at 440GeV) will be performed at jaw entrance face on Jaw 1 (FLUKA simulations by L. Lari confirmed same energy deposition peak) 11 Collimation Meeting 30.07.2012 5 th 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 10 11 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. 12 Collimation Meeting 30.07.2012 5 th 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 10 11 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 10 11 ppb at 440GeV to be equivalent to this case Jaw 1 will be taken out completely for this test. 13 Collimation Meeting 30.07.2012 5 th axis up 10 mm

14. TESTS ON TCT COLLIMATOR Summary 14 Collimation Meeting 30.07.2012 TestBeam intensity Test 13 x 10 12 p Test 1~ 6 x 10 11 p Test 27.5 x 10 12 p Post-irradiation Inspection (visible inspection using a camera) Jaw damage extent Material projection Metrology of the jaw Other visible inspection Direct Measurements Vacuum 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

15. TESTS ON TCT COLLIMATOR Schedule 15 Collimation Meeting 30.07.2012 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 16 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 Collimation Meeting 30.07.2012

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! 17 Collimation Meeting 30.07.2012

18. REFERENCES 18 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. Collimation Meeting 30.07.2012