Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 1 Design, Manufacture, Transport and Integration on-site in Chile of ALMA Antennas T2- Design Concept Phase Progress Meeting Nr. 6 - Mainz 18 & 19 July 2006

Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 2 T2 = Freezing of Design & Qualification Results End Phase June ’06 The aim of this Phase is to acquire into the design all the parameters characterizing the general layout of the antenna and all the data coming from the main components: ready to go for “Construction Drawings” ………………………………………Definition of Main Items and Industrial Processes Actual Status: the activities are not completed, the main Items and Industrial Processes are not totally frozen. T3 = CDR End Phase Sep ’06 The aim of this Phase is to develop all the activities of calculation, analysis and design, that may guaranty the total overview of the performances specification and meet the entire manufacturing process. ………………………………………Performances Verification, finalization of construction dwgs and Manufacturing documentation, freezing the interfaces Actual Status: conditioned by T2 Solution Adopted: CDR spreaded up to PPDR (from 09/ ’06 to 11/’06) Proposed Detailed Schedule (after AEM Meeting- next week)

Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 3 Bus Prototype design, no modifications RFP’s for supplier selection issued Possible design optimisation (Assembly and Tools) will be agreed directly with selected supplier and EIE (September – November 2006) Actual STATUS: No critical ISSUE Cabin Major modifications since the prototype design (ribs architecture, resin, lay-ups, use of honeycomb). RFP for pre-preg supplier selection issued. Technical assessment of new resins underway between EIE & AAS-F & AAS-I. Pre-RFP phase finished. Preliminary assessment of some evolution proposals made by EIE & AAS-F. Technical Memo about tolerances issued by AAS-F (TM01), under assessment by EIE. RFP for manufacturer selection issued. Last-minute precisions (resin, allowed processes) due end of June. Final design optimisations will be agreed with selected manufacturer, EIE & AAS-F (September – November 2006). Actual STATUS: Needed information for Material & Processes Impact: 1M Delay (or 2?)

Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 4 Apex New Design / on-going detail Design Actual STATUS: No critical ISSUE Legs Major modifications since the prototype design (mono-beam, extremities inserts and fixation). RFP for pre-preg supplier selection issued. Technical assessment of new resins underway between EIE & AAS-F & AAS-I. Pre-RFP phase finished. Technical Memos about Lower Level Specification (TM05) and Drawings (TM03) issued by AAS-F, under assessment by EIE. RFP for manufacturer selection issued. Answers are currently being received. Final design optimisations will be agreed with selected manufacturer, EIE & AAS-F (September – November 2006). Actual STATUS: Needed information for Material & Process Impact: Totally New Design 1M Delay New possible solution (CFRP interfaces)

Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 5 Interface cylinder Defined / Dwg activities needed Panels Prototype design with minor modification Updating design already received by EIE RFP’s for Medialario issued Actual STATUS: No critical ISSUE Adjusters Prototype design with minor modification. Updating design already received by EIE RFP’s for supplier selection issued. Updating detailed drawings from EIE is expected Actual STATUS: No critical ISSUE Base New design; concept defined; stiffness relative to AZ bearing under investigation; interface to drives need to be frozen New Request from Manufacturer (new form) Actual STATUS: No specific critical ISSUE

Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 6 Yoke Prototype design with modifications; stiffness relative to AZ bearing under investigation; interface to drives need to be frozen Actual STATUS: No specific critical ISSUE Access & Platform New concept exists; interface to the boxes and cabinets open; routing of cables, pipes and Hoseson-going; Actual STATUS: Needed detail items definition (i.e.:UPS System) Azimuth bearing Concept defined; Special FE-model and attachment to structure (base/yoke) open Actual STATUS: No critical ISSUE Elevation Bearing Concept defined; sealing system and disassembly open Actual STATUS: No critical ISSUE Stow pins Concept from prototype; further details need to be clarified Actual STATUS: No critical ISSUE Hard stops Concept from prototype; further details need to be clarified Actual STATUS: No critical ISSUE

Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 7 Subreflector mechanism Activities blocked (CRE01) Actual STATUS: 2M delay ( ) Sub reflector Minor modifications since the prototype design (central cone interface). Further evolutions are possible: Central cone (CRE from ESO expected), Surface treatment (alodine banned from EU), Isostatic interface with cylinder. Technical Memo about Drawings (TM04) issued by AAS-F, under assessment by EIE. RFP for manufacturer selection issued. Answers are currently being received. Actual STATUS: No critical ISSUE ACU Structure defined / On-going HW/SW definition Actual STATUS: No critical ISSUE Az. & El. Drives Concept defined / On-going strong works with Suppliers Actual STATUS: No critical ISSUE (specific attention)

Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 8 Az. & El. Brakes OK: defined solution and components Actual STATUS: No critical ISSUE Az. & El.encoders OK: defined solution and components (with IK320) Specific analysis link to tolerances. Actual STATUS: No critical ISSUE Metrology Open / On-going Layout definition Actual STATUS: No critical ISSUE Cabling Open / On-going Layout definition Actual STATUS: No critical ISSUE Elevation Cable Wrap Some modifications since the prototype design. Consultation for cable wrap itself (COTS) is underway by AAS-F at EIE’s request. Actual STATUS: No critical ISSUE Azimuth Cable Wrap New design; concept not frozen Actual STATUS: Needed decision

Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 9 Lightning Protection system Assumed Prototype design valid; interface to BUS structure need further clarification Actual STATUS: No critical ISSUE Smoke detectors Open / On-going Layout definition Actual STATUS: No critical ISSUE Power distribution Open / On-going Layout definition Actual STATUS: No critical ISSUE (Except for UPS System) Limit switches Open / On-going Layout definition Actual STATUS: No critical ISSUE HVAC (Air Conditioning) Open / Two valid solutions under evaluation Actual STATUS: No critical ISSUE Piping Open / On-going Layout definition Actual STATUS: No critical ISSUE

Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 10 Safety devices Open / On-going Layout definition Actual STATUS: No critical ISSUE Insulation Concept under review until beginning of August; further steps with sub suppliers and EIE needed Actual STATUS: No critical ISSUE Feed Shutter New concept from the prototype design. Pre-RFP phase finished. RFP for manufacturer selection issued Actual STATUS: Schedule critical linked to qualification. Receiver Membrane support Membrane supplied by ESO, not by AAS-F. Pre-RFP phase finished. Waiting for detailed definition data (linked to feed-shutter). Actual STATUS: No critical ISSUE