The SST-GATE prototype

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1 The SST-GATE prototype Hélène Sol, Delphine Dumas, Philippe Laporte, Jean-Philippe Amans, Jean-Laurent Dournaux, Gilles Fasola, Fatima de Frondat, Jean-Michel Huet, Cameron Rulten, Frédéric Sayède, Andreas Zech. Romain Fleurisson, Dominique Massol, Denis Savoie, Nicoas Pecriaux Catherine Boisson, Isabelle Jegouzo-Giroux. Observatoire de Paris, CNRS, University Paris VII. LUTH and GEPI Simon Blake, Jürgen Schmoll CfAI, University of Durham Science Meeting, November 28, Meudon

Romain Fleurisson, Dominique Massol, Denis Savoie, Nicoas Pecriaux Catherine Boisson, Isabelle Jegouzo-Giroux.

2 Agenda Introduction Telescope optomechanical structure Telescope control command SST-GATE on Meudon site Summary and Perspectives November 28, 2013 Science Meeting Meudon 2

3 SST-GATE Project SST-GATE telescope: Dual mirror small size telescope proposed for CTA Schwarzschild-Couder formula The Observatoire de Paris aims to: Design mechanical structure, optics, drives and control system, Build and test the telescope Prove the optical and mechanical performance of SC design. Propose a test bed for cameras. After the preparatory phase: Use of the telescope for scientific purposes, Use of the telescope for universities practical works, Part of the Observatory visiting circuit. November 28, 2013 Science Meeting Meudon 3

mechanical performance of SC design. Propose a test bed for cameras.

4 SST-GATE in CTA 2 others SST telescopes: ASTRI (Italy) SC telescope UJI-PAN (Polish, German, Swiss) DC telescope Implication in CTA work packages (ACTL, drives, SC-SST, data, mini-array ) Collaboration with Italians, CHEC team (UK, US, Japan) for the camera November 28, 2013 Science Meeting Meudon 4

packages (ACTL, drives, SC-SST, data, mini-array ) Collaboration with

5 S. Blake Introduction Project starts in 2011 First design from Durham Univ. Simon Blake 2011 Progress and changes in the design in order to: Be compliant with CTA requirements, Build a light and versatile telescope, Make easier the assembly and maintainability November 28, 2013 Science Meeting Meudon

with CTA requirements, Build a light and versatile telescope, Make easier the

6 Overview of the telescope Mast and Truss Structure MTS Mirror M2 Mirror M1 Dish M1 Camera Elevation Structure Fork Counterweight Tower Azimuth Structure November 28, 2013 Science Meeting Meudon 6

7 Agenda Introduction Telescope optomechanical structure Telescope control command SST-GATE on Meudon site Summary and Perspectives November 28, 2013 Science Meeting Meudon 7

Reduction of costs, simplification of maintenance step, reduction of spares.

8 Alt-azimuthal system Conceptual design: same system for azimuth and elevation drive. Possibility to merge the specifications. Ease the fabrication (less different parts). Reduction of costs, simplification of maintenance step, reduction of spares. Design A Slewing bearing with a worm gear ROLLIX / Two torque motors: ETEL TMB Encoders: HEIDENHAIN RCN 729 November 28, 2013 Science Meeting Meudon 8

9 Alt-azimuthal system: fork and bosshead November 28, 2013 Science Meeting Meudon 9

10 Optical structure and MTS Optical structure: Mirror M1, M2, camera fixed to the AAS by the MTS (Mass and Truss Structure) MTS dish: 3 arms-spider structure made with rectangular beams ( mm 3 ) Split the MTS dish and the M1 dish Increase the stiffness of the structure Ease the assembly and the maintainability Optical axis Primary Dish with actuators MTS Support Dish M1 Hexagonal structure Each vertex is located at the CoG of one M1 panel and is an interface flange for the actuators support Rectangular beams mm 3 Dish M1 could be rotate in order to mount the mirror M1 s panels. Bosshead November 28, 2013 Science Meeting Meudon 10

Optical axis Primary Dish with actuators MTS Support Dish M1 Hexagonal structure Each vertex is located at the CoG of one M1 panel and is an interface flange for

11 MTS: SMS and camera MTS is a Serrurier-like hexapod Arm is a circular beam ended with spherical bearings The bearings will be blocked after the assembly Serrurier-like hexapod increases the rigidity of the structure Secondary Mirror Structure (SMS) Three interface parts allowing The attachment of M2 via three actuators The attachment of the camera support (ICD with the camera is required) A connection with the MTS Three arms- support structure connecting these three interface parts November 28, 2013 Science Meeting Meudon 11

rigidity of the structure Secondary Mirror Structure (SMS) Three interface parts allowing The attachment of M2 via three actuators The

12 Camera Removal Mechanism November 28, 2013 Science Meeting Meudon 12

13 Telescope Optics Design from J. Schmoll Dual mirror optical design Focal surface in between M1 and M2 (CHEC) Very good PSF on axis Parameters: Diameter M: 4 m Focal length: m F# = FoV: 9 Mirror M2 Focal surface Mirror M1 80% containment diam. (deg) % containment diam. (mm) 0.51 m 3.56 m Evolution of the PSF with the FoV δ ( ) November 28, 2013 Science Meeting Meudon 13

axis Parameters: Diameter M: 4 m Focal length: 2.283 m F# = 0.

14 M1 Description Tessellation in six panels 4 meters in diameter with central hole Philosophy: CTA: mirror tile 1991 mm effective mirror area 10 m² SST-GATE: mirror tile 1380 mm effective mirror area 6.8 m² 418 mm 1362 mm Rayon 2000 mm mm Process: Manufacturing of aluminium 5083 Appropriate aspherical surface with Ra down to 0.8 µm Structure of the back to get the required mass of 20 kg/m² Polishing: Ra 0.02µm Aluminium coating mm mm Rayon 690mm November 28, 2013 Science Meeting Meudon 14

31 mm Process: Manufacturing of aluminium 5083 Appropriate aspherical surface with Ra down to 0.

15 Mirror M2 Description Aspherical, best fit by a 2.1 meter radius of curvature Diameter: 2 meter Collaboration with IRFU Manufacturing solution: same technique as for M1 Tessellation in 6 petals Machining as a monolithic mirror Polishing and coating Assembly in a monolithic structure. November 28, 2013 Science Meeting Meudon 15

Manufacturing solution: same technique as for M1 Tessellation in 6 petals

16 Agenda Introduction Telescope optomechanical structure Telescope control command SST-GATE on Meudon site Summary November 28, 2013 Science Meeting Meudon 16

17 Control command system Design and programming of the whole system of the telescope control command The architecture of the software, user s cases, telescope modes, Use of OPCUA and LabVIEW Telescope control command: pointing and tracking Monitor the telescope: programming the pointing algorithm implemented in FPGA Drives: programming the movement of the telescope Telescope safety system Avoid any damage, mechanical, electrical, software and human! Collaboration with DT-INSU on control command system: Abdel and Gilles November 28, 2013 Science Meeting Meudon 17

pointing algorithm implemented in FPGA Drives: programming the movement of the telescope Telescope safety system Avoid any damage,

18 Software Architecture November 28, 2013 Science Meeting Meudon 18

19 Agenda Introduction Telescope optomechanical structure Telescope control command SST-GATE on Meudon site Summary and Perspectives November 28, 2013 Science Meeting Meudon 19

20 Site of SST-GATE telescope: control room A room at the Observatoire is dedicated to SST-GATE. Surface ~ 20m² for: Installation of remote HMI and scientific workstation, Scientific working station, Meeting location for the project. Installation of electrical and network cabinet. SST-GATE Control room November 28, 2013 Science Meeting Meudon 20

Surface ~ 20m² for: Installation of remote HMI and scientific workstation, Scientific

21 On site progress Slab built End of 2011 Foundation for shelter and installation of Network Mid December 2012 Cabinet delivered January 2013 Installation of the shelter - Beginning of February 2013 November 28, 2013 Science Meeting Meudon 21

22 On site progress Installation of the tower March June 2013 November 28, 2013 Science Meeting Meudon 22

23 Agenda Introduction Telescope optomechanical structure Telescope control command SST-GATE on Meudon site Summary November 28, 2013 Science Meeting Meudon 23

24 FTE and collaborations on the project PI of the project: Hélène Sol Project Manager: Delphine Administrative: Nathalie, Pascale, Sabine Quality: Fatima Engineering and design: System: Philippe Mechanical design and simulation: JMichel, JLaurent Drives: JPhilippe, JMichel Optical design: Jurgen,Frédéric, Denis Electronics and Software: Gilles, Isabelle, Shan, et la DT INSU et les stagiaires Romain, Dominique, Nicolas AIT: Julien, JJacques, Sébastien Science: Science simulation: Andréas, Olivier, Cameron Data: Catherine 21 persons involved in SST-GATE project at the Observatoire 12 companies and labs involved in our project France / Italy collaboration Collaboration: Software DT-INSU Lab Mirror M2 IRFU Mirror M1: Alsyom, Polissage du Loir, Kerdry, IC Ingénieurs Conseils Actuators Nexeya Shipment: DT-INSU Ulisse Mechanical parts: Ambos, ACO Shelter: Losberger Seismic study: Freyssinet Electronics: Siemens Collaboration France SST/GATE Italy ASTRI: Internal Board to compare designs and evaluate the solutions for CTA November 28, 2013 Science Meeting Meudon 24

25 Summary Lots of innovative systems: MTS Serrurier-like hexapod, Dish M1 rotating to ease M1 tiles assembly, Camera removal mechanism ingenious, Same system in azimuth and elevation. Lightweight structure < 8 tons Easiness to transport and to mount, Drive control system develop as fully intelligent Start of the manufacturing and mounting phase Team increases Collaborations with industries and labs Now, preparation of the SST-GATE participation in CTA November 28, 2013 Science Meeting Meudon 25

26 Thank you for your attention. Hélène Sol, Delphine Dumas, Philippe Laporte, Jean-Philippe Amans, Jean-Laurent Dournaux, Gilles Fasola, Fatima de Frondat, Jean-Michel Huet, Cameron Rulten, Frédéric Sayède, Andreas Zech. Romain Fleurisson, Dominique Massol, Denis Savoie, Nicoas Pecriaux Catherine Boisson, Isabelle Jegouzo-Giroux. Observatoire de Paris, CNRS, University Paris VII. LUTH and GEPI Simon Blake, Jürgen Schmoll CfAI, University of Durham Science Meeting, November 28, Meudon

Dutch Contributions to the Cherenkov Telescope Array (CTA) Jacco Vink Big Science Day Eindhoven, 15/10/2014

Dutch Contributions to the Cherenkov Telescope Array (CTA) Jacco Vink Big Science Day Eindhoven, 15/10/2014 What is CTA? CTA will be a ground-based observatory of very high energy gamma-rays (0.2-100 TeV)