AMS Ring Imaging CHerenkov J BERDUGO CIEMAT Madrid

AMS Ring Imaging CHerenkov J. BERDUGO CIEMAT, Madrid (Spain) PURPOSE: 1. Precise measurement of the velocity of charged particles 2. Measurement of the charge of the particles Cherenkov radiation Velocity Particle Charge Velocity Cerenkov Radiator Conical Reflector Electric Charge Photodetectors AMS-02 Phase II Flight Safety Review AMS-RICH Detector. J. Berdugo – CIEMAT (Madrid, Spain) 1

AMS RICH Performances: Test at CERN Accelerator Collision products: Charge measurement: Identification of different nuclei p, D, He 4, Li 6, … Velocity measurement: Accuracy of one part in a 1000 Ek/n=158 Ge. V/n s (v)/v = 0. 09% Fe H C O Charge (Z) AMS-02 Phase II Flight Safety Review AMS-RICH Detector. J. Berdugo – CIEMAT (Madrid, Spain) Velocicty (v/c) 2

AMS RICH Main Elements 114 cm ► Dual solid radiator configuration Low refractive index aerogel Sodium fluoride 47 cm ► Conical reflector Reflectivity > 85% 64 x 64 cm 2 ► Photon detection plane Photomultiplier matrix (10880 channels) Spatial granularity: 8. 5 x 8. 5 mm 2 134 cm AMS-02 Phase II Flight Safety Review AMS-RICH Detector. J. Berdugo – CIEMAT (Madrid, Spain) 3

AMS RICH Radiator Aerogel Na. F Number of tiles 80 16 Thickness (mm) 25 5 113 x 113 85 x 85 Refractive index 1. 05 1. 33 Clarity (mm 4/cm) 0. 0055 Size (mm 2) Configuration for the Acceptance Vibration Test Max Opening Angle (deg) Na. F Threshold velocity (v/c ) 17. 8 41. 5 0. 952 0. 752 Aerogel 50 mm filter (stainless steel) Venting Valve Halkey Roberts C 770 RP Interface blocks (Peek) AMS-02 Phase II Flight Safety Review AMS-RICH Detector. J. Berdugo – CIEMAT (Madrid, Spain) 4

AMS RICH Radiator: Container Assembly and Test Assembly of the Radiator Container under the Lower TOF Structure Vibration Test Lower TOF and RICH Radiator Container AMS-02 Phase II Flight Safety Review AMS-RICH Detector. J. Berdugo – CIEMAT (Madrid, Spain) 5

AMS RICH Reflector MANDREL AMS-02 Phase II Flight Safety Review The reflector is made by a replica technique AMS-RICH Detector. J. Berdugo – CIEMAT (Madrid, Spain) Flight Unit 6

AMS RICH Detection Plane Array of 680 photomultiplier tubes HAMAMATSU 7600 -00 -M 16 • 4 X 4 pixels • Each pixel is 4 x 4 mm 2 • Gain ~ 106 @ 800 V • QE 20 % in the range 250 -600 nm 10880 sensors FRONT-END ELECTRONICS q Acquisition circuit (16 channels) q Resistor Divider for HV Mounted on 4 small PCB located at the basement HV Isolation of the phototube • Polycarbonate housing • Dow Corning injection AMS-02 Phase II Flight Safety Review AMS-RICH Detector. J. Berdugo – CIEMAT (Madrid, Spain) 7

AMS RICH Detection Plane: Thermal Test of Photomultipliers The PMT´s will stand a wide range of Temperatures (-35 O to 55 O) 55° -35° AMS-02 Phase II Flight Safety Review AMS-RICH Detector. J. Berdugo – CIEMAT (Madrid, Spain) 8

AMS RICH Detection Plane: Unit cell Mechanical Assembly Light Guide Nylon wires FE Electronics Photomultiplier Optical Pad Housing Shielding AMS-02 Phase II Flight Safety Review AMS-RICH Detector. J. Berdugo – CIEMAT (Madrid, Spain) 9

AMS RICH Detection Plane: Unit cell Mechanical Test Two unit cells were tested to reach the breakage point The wires accomplished 38 g No breakage occurred No degradation on the optical contact AMS-02 Phase II Flight Safety Review AMS-RICH Detector. J. Berdugo – CIEMAT (Madrid, Spain) 10

AMS RICH Detection Plane: Unit cells arranged in GRIDS Unit Cells Internal beams Stiffness skin U-Beam HV Patch panel Read-out boards Total Grids 4+4 Unit Cells 680 Read-out lines 92 Read-out boards 12 HV lines Thermal sensors AMS-02 Phase II Flight Safety Review AMS-RICH Detector. J. Berdugo – CIEMAT (Madrid, Spain) 160 96 11

AMS RICH Detection Plane: Grid Assembly Internal beams Assembly Jigs Unit Cells AMS-02 Phase II Flight Safety Review AMS-RICH Detector. J. Berdugo – CIEMAT (Madrid, Spain) 12

AMS RICH Detection Plane: Grid Internal Cabling HV connection Read-out kapton cables Read-out boards HV Patch panel Stiffness skin AMS-02 Phase II Flight Safety Review AMS-RICH Detector. J. Berdugo – CIEMAT (Madrid, Spain) 13

AMS RICH Detection Plane: Vibration and TVT Vibration Test Rectangular Grid (143 units) Thermal Vacuum Test Rectangular Grid (143 units) AMS-02 Phase II Flight Safety Review AMS-RICH Detector. J. Berdugo – CIEMAT (Madrid, Spain) 14

AMS RICH Detection Plane: Functional Test Online/Slow. Ctrl Software Validation: • • Read-out Communication Protocol HV Power Supply Control Software for Calibration and Data taking Temperature Sensors Read-out HV Power Supply Optical Fiber System JIN-R Characterization Data: Ø HV OFF: § Pedestals and electronic noise Ø HV ON: § Dark Current § Gains § Efficiencies AMS-02 Phase II Flight Safety Review AMS-RICH Detector. J. Berdugo – CIEMAT (Madrid, Spain) 15

AMS RICH Electronics: Read-out System 12 electronic boards located on the edge of the detector structure • Generation of control signals to drive the front-end electronics • Monitoring and setting of parameters • Processing of the signal JINR RDR 2 RDR 3 • Online calibration Produced at CRISA 21 Units (4 QM +12 FM + 5 FS) # Units (QM) # Units (FM+FS) RDR 2 (2 CDPs) 1 4+2 RDR 3 (3 CDPs) 1 2+1 RDR 3 L (3 CDPs) 1 2+1 JINR 1 4+1 Board AMS-02 Phase II Flight Safety Review (1 CDP + 1 CDDC) AMS-RICH Detector. J. Berdugo – CIEMAT (Madrid, Spain) 16

AMS RICH Final Assembly: Grids in the Main Structure AMS-02 Phase II Flight Safety Review AMS-RICH Detector. J. Berdugo – CIEMAT (Madrid, Spain) 17

SUMMARY ü The RICH detector has been validated by testing all the critical elements under different external conditions ü Two test beam data campaigns have demonstrated that the required capabilities of the detector are reached ü The detector is close to final completion and on schedule for integration at CERN AMS-02 Phase II Flight Safety Review AMS-RICH Detector. J. Berdugo – CIEMAT (Madrid, Spain) 18