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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
3Collimation Meeting 30.07.2012
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
4Collimation Meeting 30.07.2012
TESTS ON TCT COLLIMATOR
TCTH Collimator Jaw
5Collimation 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
• 5th axis for vertical position(max: +/- 10 mm)
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) 6Collimation Meeting 30.07.2012
TESTS ON TCT COLLIMATOR
Control Application
7Collimation Meeting 30.07.2012
FESA class and control Application was adopted for the HRM experiment(G. Valentino, A. Masi and Team)
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
8Collimation Meeting 30.07.2012
Table 1 Table 2TCTH
Table 3
Beam direction
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) ~ 3.3mm
• 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)
9Collimation Meeting 30.07.2012
TESTS ON TCT COLLIMATOR
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).
10Collimation Meeting 30.07.2012
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)
11Collimation Meeting 30.07.2012
5th axis down10 mm
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.
12Collimation Meeting 30.07.2012
5th axis up10 mm
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.
13Collimation Meeting 30.07.2012
5th axis up10 mm
TESTS ON TCT COLLIMATOR
Summary
14Collimation Meeting 30.07.2012
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
TESTS ON TCT COLLIMATOR
Schedule
15Collimation 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
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
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!
17Collimation Meeting 30.07.2012
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.
Collimation Meeting 30.07.2012
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