William H. Lee

End-to-end simulations for COLIBRI, ground follow-up telescope for the SVOM mission.

We present an overview of the development of the end-to-end simulations programs developed for COLIBRI (Catching OpticaL and Infrared BRIght), a 1.3m robotic follow-up telescope of the forthcoming SVOM (Space Variable Object Monitor) mission dedicated to the detection and study of gamma-ray bursts (GRBs). The overview contains a description of the Exposure Time Calculator, Image Simulator and photometric redshift code developed in order to assess the performance of COLIBRI. They are open source Python packages and were developed to be easily adaptable to any optical/ Near-Infrared imaging telescopes. We present the scientific performances of COLIBRI, which allows detecting about 95% of the current GRB dataset. Based on a sample of 500 simulated GRBs, a new Bayesian photometric redshift code predicts a relative photometric redshift accuracy of about 5% from redshift 3 to 7.

Conceptual design proposed for the M2-f/5-Nasmyth support system of the Telescopio San Pedro Mártir project

The work that is presented is in its early stage. The intention of this document is to present the conceptual proposal of the design of the cell for Nasmyth-f/5 secondary mirror (TSPM-M2-f/5-Nasmyth), its support system and the mirror of this configuration for the “Telescopio San Pedro Mártir” (TSPM) project. In order to obtain more precise input data for the requirements of the telescope in terms of its: weight, center of gravity, interfaces with the telescope spider assembly and manufacturing viability. The goal of providing accurate data for the mechanical studies of the telescope was fulfilled. With this we ensure more realistic results in the opto-mechanics performance analysis of the whole telescope´s. The telescope´s requirements are the input data for the Opto - mechanics performance and survival analyses, both studies done by CIDESI. For this, it is necessary to have for this telescope configuration a conceptual proposal design of TSPMM2- f/5-Nasmyth. We present the TSPM-f/5 Nasmyth support system proposal, which include the M2 cell, mirror and interface. Finite Elements Analyses (FEA) results of the support system and the mirror are presented too. In the conclusion we present some evidence of the pending future work for this study.

Preliminary design for the f/5 Nasmyth tertiary mirror configuration for the TSPM

The preliminary design for the f/5 Nasmyth tertiary mirror opto-mechanical configuration for the 6.5m Telescopio San Pedro Mártir (TSPM), to be installed at the Observatorio Astronómico Nacional (OAN) in the Sierra San Pedro Mártir in Baja California is presented. The proposed system consists of support and alignment of the honeycomb mirror within the cell, the correction of the optical surface deformation, both tasks by means of an active push-pull pneumatic system and the correction of the displacements and rotations transferred by the Tube support structure to the configuration by means of electro-mechanical actuators. This optical configuration and four folded Cassegrain stations will be fully defined after first light of the f/5 Cassegrain configuration, so the requirements and considerations of these positions also need to be taken into account.

Mechanical preliminary design of the 6.5 meter Telescopio San Pedro Mártir (TSPM)

The Telescopio San Pedro Mártir project intends to build a 6.5 meters telescope with alt-azimuth mount and it has currently finished the preliminary design. The project is an association between Instituto de Astronomía de la Universidad Nacional Autónoma de México and the Instituto Nacional de Astrofísica, Óptica Electrónica in partnership with the University of Arizona and the Smithsonian Astrophysical Observatory. The telescope preliminary design this is lead and developed at Querétaro by the Centro de Ingeniería y Desarrollo Industrial. An overview of the preliminary design and the structural design updates are summarized in this paper.

The Telescopio San Pedro Mártir project

The Telescopio San Pedro Martir project intends to construct a 6.5m telescope to be installed at the Observatorio Astron´omico Nacional in the Sierra San Pedro M´artir in northern Baja California, Mexico. The project is an association of Mexican institutions, lead by the Instituto Nacional de Astrofısica, Optica y Electronica and UNAM’s Instituto de Astronomia, in partnership with the Smithsonian Astrophysical Observatory and the University of Arizona’s Department of Astronomy and Steward Observatory. The project is advancing through the design stage, having completed five design reviews of different subsystems in 2016 and 2017 (enclosure and services: PDR, CDR; optical design: PDR; optics: progress review; telescope: PDR). Once completed, the partners plan to operate the MMT and TSPM as a binational astrophysical observatory.

Recent developments at the OAN-SPM

The Observatorio Astron´omico Nacional on the Sierra San Pedro M´artir (OAN-SPM) in Baja California, Mexico is currently undergoing a substantial expansion in its observational infrastructure. The OAN-SPM’s three principal telescopes were installed in the 1970s. In 2015, the BOOTES-5 telescope was installed and is now operational (partners: Mexico, Spain, South Korea). In 2011 the construction of the TAOS-II project begun and its three telescopes are now in commissioning (partners: Taiwan, Mexico, USA, Canada). Also undergoing commissioning are the COATLI and DDOTI projects (both: Mexico, USA). Two projects, COLIBR´I and SAINT-EX are about to begin construction (COLIBR´I: Mexico, France; SAINT-EX: Switzerland, Mexico, UK). Finally, the Telescopio San Pedro M´artir project is advancing through its design phase (partners: Mexico, USA). All save the TSPM are fully funded, so the OAN-SPM will host 11-12 telescopes by the 2020’s, ranging in size from 28cm to 6.5m.

Telescopio San Pedro Mártir Observatory final design

The Instituto de Astronomía of the Universidad Nacional Autónoma de México (UNAM) along with Instituto Nacional de Astrofísica, Óptica y Electrónica, the University of Arizona and the Smithsonian Astrophysical Observatory are developing the Telescopio San Pedro Mártir (TSPM) project, a 6.5m diameter optical telescope. M3 Engineering and Technology Corp. (M3) is the design and construction administration firm responsible for all site infrastructure, enclosure and support facilities. The Telescopio San Pedro Mártir project (TSPM) will be located within the San Pedro Mártir National Park in Baja California, Mexico at 2,830 m. above sea level, approximately 65 km. east of the Pacific Ocean, 55km west of the Sea of Cortes (Gulf of California) and 180km south of the United States and México border. The aim of this paper is to provide an update of SPIE paper 9906-84 to identify the changes associated with final design for the site infrastructure, enclosure and support facilities to date and share the design and construction approach.

Primary and secondary mirror manufacturing for COLIBRI ground follow-up telescope of the SVOM mission

COLIBRI is one of the two robotic ground follow-up telescopes for the SVOM (Space Variable Object Monitor) mission dedicated to the study of gamma-ray bursts, allowing determination of precise celestial coordinates of the detected bursts. COLIBRI telescope is a two-mirror Ritchey-Chrétien telescope whose concave primary and convex secondary mirrors have diameters of 1325mm and 485mm respectively. The mirrors are currently manufactured at LAM (Laboratoire d’Astrophysique de Marseille). In this article, the advancement of the work is presented. We also give a global overview and status of the COLIBRI project.

Improved Dynamic Response of Piezoelectric Composite Shells using Multiobjective Optimization and Closed Loop Control

A multiobjective optimization procedure is developed for improving the vibratory response of composite shells with distributed piezoelectric patches under a variety of loading conditions. The objective is to minimize the overall maximum deflection associated with the first five modes of vibration and the static deflection as the shell is subjected to electrical, mechanical and combined loading. Constraints are imposed on the natural frequencies and stresses. The stacking sequence is used as a design variable to investigate the most efficient stiffness distribution. A closed loop control system is designed using Linear Quadratic Gaussian (LQG) controller. The multiple objective function problem is formulated using the Kreisselmeier-Steinhauser (K-S) function approach. Using this approach, the multiobjective constrained optimization problem is reduced to the unconstrained optimization of a single envelope function (the K-S function). A Simulated Annealing algorithm is used as the search algorithm. Numerical results are presented for a variety of loading conditions to show the significant improvements in vibratory response from optimizing the stacking sequence. The influence of the orientation of the piezoelectric patch is also investigated. Nomenclature ij σ =s tress ij e =s train k E = electric field ijk e = piezoelectric constants i D = electric displacement ijkl c = elastic constants ij b = dielectric permittivity φ = electric potential i u = deformation on displacement boundary i t = traction on displacement boundary q = charge accumulated (sensing signal) γ = structural damping ratio i f = components of force per unit volume D S = charge boundary σ S = stress boundary ) (φ i F =i th objective function