performance requirements technical specifications CTA requirements From performance requirements to technical specifications German Hermann, Towards CTA specs Project Committee, 2011-02-01

Towards “the optimal solution” Science Goals Cost Estimate Require- ments System Architecture German Hermann, Towards CTA specs Project Committee, 2011-02-01

Requirements and technical specifications We (CTA) define our specifications by ourselves customer = contractor we better understand what we really need, and why … German Hermann, Towards CTA specs Project Committee, 2011-02-01

Towards “the optimal solution” “Optimal solution” vs. development on finite time scale: Let’s be pragmatic Goal: enable prototyping of assemblies and sub- systems asap ! Parameters of prototypes as close a possible to final solution ! We need to create a consistent picture, fix requirements, narrow down parameter space and derive high level technical specifications German Hermann, Towards CTA specs Project Committee, 2011-02-01

Systems level definition Proposal: System : The CTA observatory Sub-systems: Telescopes, array trigger, central DAQ-system, atmo-monitoring, … Assemblies: Cameras, telescope structures, reflectors, drive systems …. Components: PMTs, HV, Mirrors, calibration devices, actuators, motors …. German Hermann, Towards CTA specs Project Committee, 2011-02-01

Requirements levels Level 1: fundamental science requirements Scientific mission Duration, timeline Cost Schedule Level 2 (A): observatory system requirements Level 3 (B): Sub-system requirements Level 4 (C): requirements on assemblies (structures, cameras, …) Level (D): requirements on components German Hermann, Towards CTA specs Project Committee, 2011-02-01

Requirements: level 1 Level 1 Fundamental requirements of the observatory (as defined in 2005 LOI to ESFRI): x 10 sensitivity in core energy regime (1-10 TeV) ~ x 1000 dynamic range in energy (some 10 GeV to 100s of TeV) improved angular resolution (x 5) Energy resolution Large(r) gamma-ray field of view , full sky coverage: south: full energy coverage; north: emphasize on low energies Cost envelope: 150 MEuro construction cost (as of 2005) Schedule: Operation cost: < 10 % per year (< ~ 5 %) German Hermann, Towards CTA specs Project Committee, 2011-02-01

First Draft Documents German Hermann, Towards CTA specs Project Committee, 2011-02-01

Draft/work material on Wiki German Hermann, Towards CTA specs Project Committee, 2011-02-01

Current “editing team” SST: R. Canestrari, R. White MST: B. Khelifi LST: O. Blanch Bigas, Th. Schweizer MC: J. Hinton, K. Bernloehr R.Mirzoyan, P.Vincent, M. Panter, A. Foerster, M.Doro, C.Delgado All of them can only spend a (very) small fraction of their time on that work Still hell of a lot to be done Team is clearly manpower (time) limited – need ~2-3 persons working ~full-time, supported by WP coords German Hermann, Towards CTA specs Project Committee, 2011-02-01

Requirements vs techn. specs ?! German Hermann, Towards CTA specs Project Committee, 2011-02-01

Requirements vs techn. specs ?! feasible ?! Cost ?! “Physicists” “Engineers” Requirement Technical Specifications (implementation dependent) German Hermann, Towards CTA specs Project Committee, 2011-02-01

Towards “the optimal solution” Science Goals Cost Estimate Require- ments System Architecture German Hermann, Towards CTA specs Project Committee, 2011-02-01

Towards “the optimal solution” What are the science wishes ??? When can we expect feedback from prototyping projects ? What is technically feasible ??? What is affordable ??? German Hermann, Towards CTA specs Project Committee, 2011-02-01

German Hermann, Towards CTA specs Project Committee, 2011-02-01