LATLAT CU Beam Test 3rd May GLAST Program CU Beam Test CU Integration Francesco Nicola

LATLAT CU Beam Test 3rd May Overview  Highlights of the INFN Integration Procedure: Requirements Towers Integration CALs Integration  INFN CAL Integration MGSE: Main feature Comparison with SLAC philosophy Proof Test

LATLAT CU Beam Test 3rd May Highlights of INFN Integration Procedure LAT-PS Requirements: –Critical components Part of the components of the CU are FLIGHT HARDWARE CAL: Cesium iodide crystals of calorimeter have an allowable relative humidity range of 35 to 50%. (Bagging and N 2 flow at all times) –Environmental All operations will be performed in Class 100,000 Clean Room Electrostatic Discharge Control Per NASA-STD –Quality Assurance Assembly and Inspection Data Sheet QC inspection at the completion of each assembly sequence Quality assurance will maintain surveillance of the operations required by this procedure

LATLAT CU Beam Test 3rd May Towers Integration: Performed according to LAT-PS Tracker Integration Procedure Towers are integrated from above the 1x4 Grid in two adjacent bays towards one of the sides (Bays 2-3) TKR Tower to Grid interface Hardware (Studs and Cones) very well known by the INFN Integration Team (18 TKR Towers!!!) 2 3 Highlights of INFN Integration Procedure LAT-PS-08132

LATLAT CU Beam Test 3rd May CAL Integration: Different approach from that of LAT-PS Calorimeter Integration & Processing Procedure : –CAL’s are integrated from underneath the 1x4 Grid instead of lowered into respective Bays. Reasons: »INFN Clean Room lacks necessary ceiling clearance »No overhead travelling crane –New MGSE and Procedure developed for this purpose Challenges: »Replicate same restraints and degrees of freedom during the entire operation »Use consistent safety precautions for the hardware and personnel »Adapt SLAC philosophy to INFN needs or absence of needs (e.g. CAL inversion) »Optimize use of available space (INFN Clean Room is not devoted entirely to GLAST!) »Maximize value of training performed at SLAC Highlights of INFN Integration Procedure LAT-PS-08132

LATLAT CU Beam Test 3rd May INFN CAL Integration MGSE Main Features: X direction Table Y direction Table Vertical Drive Unit (Z direction) Rotating Support Plates (θ angle) Thrust Ball Bearing, Sphered Housing Washer (φ & ψ angles - small) Torque Limiter Z Y X θ ψ φ

LATLAT CU Beam Test 3rd May INFN CAL Integration MGSE Comparison with SLAC philosophy: SLACINFN Degrees of Freedom Allowed 6 – provided by overhead crane and suspension 6 – provided by the dedicated MGSE (see previous slide) Alignment Provided by SLAC Alignment Tool and Rods Provided by SLAC Alignment Tool and Rods (shortened) Mechanical Safety Feature Proper travel of CAL monitored by Load Cell Any overload is stopped by the Torque Limiter Electrical Safety Feature Voltmeter connected between CAL and Grid Different approach, same philosophy!!

LATLAT CU Beam Test 3rd May INFN CAL Integration MGSE Putting it all together:

LATLAT CU Beam Test 3rd May Proof Test Performed according to: NASA-STD Standard for Lifting Devices and Equipment NASA-STD-5005AGround Support Equipment ASME B30.1 Jacks Load Applied: Tower Mass Simulator123 kg+ LAT-DS kg= ___________________________________________ Total132 kg Actual load(CAL+TEM/TPS)~95 kg

LATLAT CU Beam Test 3rd May Proof Test Proof Load applied in the worst position for the structure (midspan of Y-table) No appreciable distorsion or failure Proof Test Successful!

LATLAT CU Beam Test 3rd May Conclusion Ready for Integration – In any case we will perform a full dress reharsal of the procedure using non-flight material But if anything goes wrong…. …we are outta here!! Anywhere fun darn!!