Slide 1

Wire Scanner Jose Luis Sirvent Blasco on behalf of the Beam Wire Scanner design team 22/11/2013 BWS Design team: B. Dehning, J.Emery, C.Pereira, J.Herranz, R.Veness, N.Chritin, W. Andreazza S.Samuelsson, M.Koujili. BI Review on Radiation Development and Testing 1 Slide 2 Wire Scanner 1. Introduction Jose Luis Sirvent Blasco on behalf of the Beam Wire Scanner design team 22/11/2013 BWS Design team: B. Dehning, J.Emery, C.Pereira, J.Herranz, R.Veness, N.Chritin, W. Andreazza S.Samuelsson, M.Koujili. BI Review on Radiation Development and Testing 2 Slide 3 1. Introduction 1.1 Wire Scanner principle Invasive method for beam transverse profile measurement. Carbon wire interaction (30um) generates shower of secondary particles. Transversal profile: Wire position (X axis) Secondary rain (Y axis) System compromises: Wire blow-up (heat) Losses produced Mechanical stresses (Bellows) Calibration procedures Vibrations Types: Rotating Fast Rotating Short/Long Linear Total Scanners: 31 Usage in a daily basis at CERN AcceleratorTypeQuantity SPSRotating6 SPSLinear4 3 Slide 4 1. Introduction 1.2 Current system limitations Better reproducibility & accuracy needed for scans: Beam size min LHC 130 um, PSB 2000 um Sensors and actuators outside vacuum chamber Not direct measurement of wire position (External potentiometer) Not direct relationship motor/wire movement (Mechanical transformations) Mechanical play Secondary Particle acquisition system: Need to Set-up working point of PMT (Amplif.) & Filters (Which) Working point has a clear impact in the Beam sigma measurement (PMT Saturation) Limited dynamic range in any configuration (Tails measurements) High Intensity beams rise up the noise level and therefore decreases the dynamic range. Aging of bellows Limits the operational life of the BWS In case of an accident the Vacuum is lost Scintillator Filters PMT Preamplifiers (**)Acquisition system and PMT saturation effect PSB Fast Wire Scanner 4 Slide 5 Resolver X Axis: Optical position sensor Y Axis: Diamond Detector 1. Introduction 1.4 BWS Prototype (Mechanical Aspects) Scan at least as fast as the existing system (20 m/s needed to avoid wire damage) Absolute accuracy of beam width determination of about 5 um (~5%) Reduction of play in mechanical system All elements mounted on same axis High accuracy angular position sensor Optical position sensor (Encoder) Overcome bellow limitations Locate all moveable parts in the vacuum Minimize fork and wire deformations: Acceleration profile optimized for low vibrations Mechanical design for minimum shaft and forks deformation Unified design for integration in the different accelerators (PS, SPS & LHC) Motor Magnetic Stopper Stepped Vacuum Barrel Carbon Wire 5 Slide 6 QD51710 Prototype BWSH51740 LSS5 Max Year 09/10 ~ 180Gy LSS5 Max Year 07/08 ~ 150Gy QD517/8 Max Year 09/11 ~ 1.5kGy QD517/8 Max Year 07/09 ~ 100Gy QD51810 If electronics on radiation, some separation needed to reduce the dose level. 1. Introduction 1.4 BWS Prototype (Location 2014: SPS LSS5) 6 Slide 7 Wire Scanner 2. Sub-systems exposed to radiation Jose Luis Sirvent Blasco on behalf of the Beam Wire Scanner design team 22/11/2013 BWS Design team: B. Dehning, J.Emery, C.Pereira, J.Herranz, R.Veness, N.Chritin, W. Andreazza S.Samuelsson, M.Koujili. BI Review on Radiation Development and Testing 7 Slide 8 Primary Electronics: Control LD power and adapt PD signal to be acquired by ADC. Optical Circulator: Directs the light form the LD to the sensor system and the reflected signal to the PD. Optical Feedthrough: Overcomes the vacuum barrier. Lens system: Focuses the light from ~9um (fibre core) to ~20um (reading spot) and collects reflections. Encoder disc: Made of Soda-lime glass with high reflectivity Cr. Tracks. Characteristics: All optic sensor system (in tunnel) working with SMF 9/125um @ 1310nm Photodiode Signal 2. Sub-systems exposed to radiation 2.1 Optical position sensor Counts: 20.000 Resolution: 314 uRad Accuracy: 25 uRad AIR VACUUM Encoder Disc on detail Long Optical Link (250m) Surface Tunnel 8 Slide 9 Radiation in optical components: In general when Increases the Radiation effect decreases Many studies available for material selection Fused Silica has proved to be one of the best materials CERN has already standard RadHard SMF F.O Decisions made for radiation impact minimization: System: Build with enough optical power margin (~7dB) Working wavelength: 1310nm (many available telecom components) Lens: Pure Silica Aspheric lenses. Fibre Optic: SMF 9/125 for 1310nm Use of Standard CERN RH SMF for tunnel. Short of Special Ge-Dopped SMF for Vacuum & High temp RIA Prevision for operational life @ 20KGy (1KGy/y) Short patch cord (1m): 0.04dB Long Link (250m): ~5dB 2. Sub-systems exposed to radiation 2.1 Optical position sensor RIA of 6 RH-SMF @ 1310nm up to a total dose 10KGy 9 Slide 10 Proposed detector for secondary particles: pCVD diamond detector This is a Solid State Ionization Chamber: Energy deposited Generation mobile charges e-h Electrical current when applying Vbias (Proportional to the Energy) Already validated for Single particle detection (*) as well as for Intense beams (**) Linearity already proven in very large dynamic ranges, from few A for MIPs to Amps. Many Know-How at CERN, RD42 collaboration, and already used in BE/BI-BL, Atlas BCM, CMS BCM (*) B.Dehning, E. Effinger, H. Pernegger, D. Dobos, H. Frais-Kolbl, E.Griesmayer. Test of a Diamond Detector using Unbunched Beam Halo Particles. Feb.2010 (**) J.L. Fernandez-Hernando. Development of a Beam Condition Monitor system for the Experimental Areas of the LHC using CVD Diamond. PhD. Thesis (***) C.Kurfuerst et al. Radiation Tolerance of Cryogenic Beam Loss Monitor Detectors. 4th International Particle Accelerator Conference, Shanghai, China, 12 - 17 May 2013 Copyright: CIVIDEC Instrumentation GmbH 2. Sub-systems exposed to radiation 2.2 Secondary particle acquisition system 10 Slide 11 Motor Parker 500150-5Y: High power density : Lower mass and inertia at equivalent torque Frameless : Insertion of a vacuum barrel between the stator and rotor Permanent magnets for high temperature stability Resolver RO3620: Solid Rotor Resolver: No windings on rotor Low frequency component: Immunity to high frequency noise No semiconductors on the transducer: No sensitive electronics Kapton used as isolator in cables and windings. These systems are commercially available Magnetic stopper: Safety device to stop the BWS in a safe position Stopper active when system is not powered System under study and development System monitoring Sensors: Wire resistivity & Wire induced currents Samarium-Cobalt Magnets for radiation resistance are envisaged 2. Sub-systems exposed to radiation 2.3 Motor, Resolver & Magnetic stopper Rotor Stator Rotor Stator Air Gap Motor Parker 500150-5Y Resolver RO3620 Magnetic Stopper: Concept under study Air Gap 11 Slide 12 Motor Parker 500150-5Y: High power density : Lower mass and inertia at equivalent torque Frameless : Insertion of a vacuum barrel between the stator and rotor Permanent magnets for high temperature stability Resolver RO3620: Solid Rotor Resolver: No windings on rotor Low frequency component: Immunity to high frequency noise No semiconductors on the transducer: No sensitive electronics Kapton used as isolator in cables and windings. These systems are commercially available Magnetic stopper: Safety device to stop the BWS in a safe position Stopper active when system is not powered System under study and development System monitoring Sensors: Wire resistivity & Wire induced currents Samarium-Cobalt Magnets for radiation resistance are envisaged 2. Sub-systems exposed to radiation 2.3 Motor, Resolver & Magnetic stopper Rotor Stator Rotor Stator Air Gap Motor Parker 500150-5Y Resolver RO3620 Magnetic Stopper: Concept under study Air Gap Demagnetization of different magnet types irradiated with high energy electrons 12 Slide 13 Wire Scanner 3. Beam Secondary Shower Acquisition System Design: (Project under development) Jose Luis Sirvent Blasco on behalf of the Beam Wire Scanner design team 22/11/2013 BWS Design team: B. Dehning, J.Emery, C.Pereira, J.Herranz, R.Veness, N.Chritin, W. Andreazza S.Samuelsson, M.Koujili. BI Review on Radiation Development and Testing 13 Slide 14 Perform acquisition with large dynamic range (Dynamics 1e6) From Pilot beam (NpBunch=0.05*10 11 ) to High Intensity Physic beams LHC (NpBunch=1.2*10 11 ) Common system for LHC, SPS, PS and PSB beams Flexible system able to provide turn by turn and bunch by bunch measurements. System at 40MHz. Quick adaptation for different accelerators and users. Low noise measurements (accurate tails determination). Separation Detector-Surface up to 250m. If electronics on tunnel should resist up to 100Gy/year (2kGy whole operational life) 3. Beam Secondary Shower Acquisition System Design: 3.1 Challenges for next generation measurement device Example of different beams on PS 14 Slide 15 -20dB 40dB -6dB pCVD Cividec Amplifier Attenuator Cividec Diamond Detector DC-4GHz Splitter -6dB DC-4GHz Splitter -6dB 34dB -12dB -32dB -6dB HV 12V Tunnel Surface For dynamic range coverage 1e6: Signal splitting / amplification / attenuation Lines well adapted Normalization of dynamics in every line (2mV 1V) Dynamics 500 per line Termination 50 Fc= 5 Hz Low Pass Filter DC Main principle: Digitalization in parallel of the 3 lines. Line combination by software. Reconstruction of the profile with very good resolution in each range. System optimization and lines adapted. 3. Beam Secondary Shower Acquisition System Design: 3.2 RF-Based Very Front-End layout 15 Slide 16 Very front End Performance assessment under radiation based on BLM experience: Same components used for BLMED & Secondary particles acquisition system. Many of these BLMED have an ionization chamber (BLMEI) close to it that can be used as a reference. 3. Beam Secondary Shower Acquisition System Design: 3.2 RF-Based Very Front-End layout (BLM Experience) BLM Diamond Diamond BLM (BLMED.06R7.B2T10_TCHSS.6R7.B2) and Ionization chamber (BLMEI.06R7.B2I10_TCHSS.6R7.B2) Ionization Chamber Worst Case BLMED 6KGy/month Operating 2 years : ~70KGy/y Cumulated dose: ~140KGy No errors detected on amplifier and splitting system up to now 16 Slide 17 3. Beam Secondary Shower Acquisition System Design: 3.3 Facing some decisions for system design (Under Study) pCVD Diamond Detector Splitting System (PreAmplif) Digitalization (ADC, Integration) Storage and Processing Optical link Interface Optical link Interface pCVD Diamond Detector Splitting System (PreAmplif) Digitalization (ADC, Integration) Storage and Processing SurfaceTunnel Coaxial cables Fibre Optic 1. Digitalization placement On surface: Long signal cables needed (CK50 250m) Very simplified layout and robust system (Maintenance) Pulse distortion and noise. High capacitive input to ADC. On tunnel (RH Electronics): Electronics placed ~2-5m from beam pipe Optical link needed (GBTx and VTRx based at 4.8Gbps) Much more developments needed Very clean digitalized signal 2. Digitalization method: 25ns bunch Integration (QIE10 based): High dynamic range 100e3 (17bits) with only 8 bits. Charge integration and encoder @ 40 MSPS Quantification error ~1% Radiation hard ASIC 40MSPS direct signal acquisition (ADC): Filtering/shaping stage for noise removal (BPF or LPF) Under-Sampling technique Very low quantification error Existing radiation hard possibilities 17 Slide 18 FMC Connector NEW VFC VME FMC Carrier Board FPGA Arria V Back plane VME64 Connector BOBR VME Board Back plane VME64 Connector Clk_bunch Clk_Turn Clk_Events SFP+ Memory TTC Ethernet Selection Logic AD 12Bits AD 12Bits AD 12Bits AD 12Bits AD41240 GBTx&GBT-SCA Or Igloo2 FPGA CLK Versatile Link VTRx Data Control Front-End #1 Filter Shaper Filter Shaper Filter Shaper +34dB -12dB -32dB DC QIE10 A QIE10 B AD 12Bits GBTx&GBT-SCA Or Igloo2 FPGA CLK Versatile Link VTRx Data Front-End #2 -6dB -26dB DC VFC could drive up to 4 Front-Ends Front-End #1: QIE10 Based Quantification Error ~ 1% Integration Some Slow control signals needed for QIE10 (Pedestrials) Front-End #2: ADC Based AD41240 (Cerns RadTol) available from 2003 Needed shapers In the inputs (noise reduction) Quantification Errors