Tests on a Fully Assembled TCT Collimator in
Tests on a Fully Assembled TCT Collimator in the Hi. Rad. Mat Facility M. Cauchi, D. Deboy, on behalf of the Collimation Team Collimation Meeting 30. 07. 2012
OUTLINE • Collimation-Related Hi. Rad. Mat Tests in 2012 • Tests on a Fully Assembled TCT Collimator Ø Purpose & Type of Tests Ø Experimental Setup Ø Beam Parameters to be used Ø Details of Tests • Microphones at HRM Ø Installation Layout Ø Purpose of Sound Analysis Collimation Meeting 30. 07. 2012 2
Hi. Rad. Mat TESTS Collimation-Related Hi. Rad. Mat Tests in 2012 to be performed with high intensity beam • HRMT-09: involving a Phase I Tertiary Collimator (TCTH) (w 32: 06/0810/08) 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 (w 44: 29/10 -02/11) Motivation: to assess the performances of different materials in extreme conditions Collimation Meeting 30. 07. 2012 3
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 Collimation Meeting 30. 07. 2012 4
TESTS ON TCT COLLIMATOR TCTH Collimator Jaw 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) 5
TESTS ON TCT COLLIMATOR Experiment Instrumentation • 5 x Stepper motors (with Resolver) : MACCON SM 87. 2. 18 MN Z 280 , 2 A (LHC collimator type) • 7 x position sensors (LVDT) : Measurement specialties HCA 2000 (LHC collimator type) • 12 x End-position switches: SAIA-BURGESS V 3 FN (LHC collimator type) • 4 x jaws temperature sensors: CAP IT PT 100 ceramic sensor (LHC collimator type) • 2 x collimator tank temperature sensors: MINCO S 100820 PDXK 100 A Polyimide PT 100. • 2 x water temperature sensors: CONDUSTRIE-METAG AG PT 100 (LHC collimator type) • 2 x water pressure sensors: SENSORTECHNICS GMBH CTE 9000 series (signal 4 -20 m. A) • 2 x vacuum pressure sensors (Piranni / Penning HV) Collimation Meeting 30. 07. 2012 6
TESTS ON TCT COLLIMATOR Control Application FESA class and control Application was adopted for the HRM experiment (G. Valentino, A. Masi and Team) Collimation Meeting 30. 07. 2012 7
TESTS ON TCT COLLIMATOR HRM Layout Beam direction Table 1 Table 2 TCTH Table 3 • TCTH Collimator pre-assembled on experimental table in BA 7 • Quick Plug connections similar to LHC collimators • Installation and Removal remotely with crane Collimation Meeting 30. 07. 2012 8
TESTS ON TCT COLLIMATOR 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. 3 mm • Beam parameters for the irradiation tests: bunches of 0. 5 mm round beam at collimator jaw entrance face (beam size equivalent to beam size at TCTH location), 1. 5 x 1011 ppb intensity, 440 Ge. V • Impact parameter: 2 mm Collimation Meeting 30. 07. 2012 9
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). Collimation Meeting 30. 07. 2012 10
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 Hi. Rad. Mat bunches (1. 5 x 1011 ppb at 440 Ge. V) will be performed at jaw entrance face on Jaw 1 (FLUKA simulations by L. Lari confirmed same energy deposition peak) 5 th axis down 10 mm Collimation Meeting 30. 07. 2012 11
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 440 Gev) 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. 5 th axis up 10 mm Collimation Meeting 30. 07. 2012 12
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 5 Te. V 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 440 Ge. V to be equivalent to this case • Jaw 1 will be taken out completely for this test. 5 th axis up 10 mm Collimation Meeting 30. 07. 2012 13
TESTS ON TCT COLLIMATOR Summary Beam Parameters Test Beam intensity 440 Ge. V Protons Test 1 3 x 1012 p 1. 5 E 11 ppb Test 1 ~ 6 x 1011 p 0. 5 mm x 0. 5 mm Test 2 7. 5 x 1012 p Direct Measurements Vacuum Pressure Water Pressure Temperature Microphone signal Post-irradiation Inspection (visible inspection using a camera) Jaw damage extent Material projection Metrology of the jaw Other visible inspection • Further manual analysis after necessary activation cool-down period (t. b. d. ) Collimation Meeting 30. 07. 2012 14
TESTS ON TCT COLLIMATOR Schedule ü ü ü • • • Vacuum and Instrumentation test Pre-Assembly on Experimental table in BA 7 Control and Data Logging Installation in HRM experimental area – W 31 (this week) Tests at HRM – W 32 Storage (behind HRM Beam Dump) – W 33 for at least 4 months Collimation Meeting 30. 07. 2012 15
MICROPHONES AT HRM Installation Layout • • • Collimation Meeting 30. 07. 2012 Microphone Up- and Downstream for signal correlation (estimate location of impact) Back. Up Microphone ca 30 m Upstream at Patch. Rack Hydrophone (taken from LHC installation) – Underwater microphone in air, R 2 E test of sensor 16
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, R 2 E) Application: Collimation Meeting 30. 07. 2012 17
REFERENCES • R. Assmann, A. Bertarelli, A. Rossi, “Requirements for 2012 Tests on Fully Assembled Collimators and on Collimator Material Samples in the Hi. Rad. Mat 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 18
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