ISM LAZIO Experiment Safety TIM September 23 rd
ISM- LAZIO Experiment Safety TIM September 23 rd, 2004 23/09/2004 Safety TIM 1
ISM- LAZIO Experiment development Team : • • • • Principal Investigator: Mr R. Battiston (Perugia) Magnetometer: Mr V. Sgrigna (Roma III) Alteino experiments : Mr P. Picozza (Roma II) System engineer (Mech): Mr S. Rossi (SERMS Terni) System engineer (Electr) : Mr A. Papi (INFN Perugia) Verification and testing : Mr S. Ascani (SERMS Terni) Trigger : Mr M. Casolino (Roma II) , Mr. A. Popov (MEPHI) Ladders : Mr M. Ionica (INFN Perugia) Integration : Mr L. Valentini (Ferrari) PC architectural: Mr L. Conti (Roma III) Software development : Nergal srl (Roma) Product assurance : Kayser Italia srl (Viareggio) Safety : Kayser Italia srl (Viareggio) 23/09/2004 Safety TIM 2
ISM- LAZIO Experiment Main Scientific Objectives • LAZIO/SIRAD experiment aims: – To perform a number of measurements of cosmic ray in space, – To understand their relation to anomalous phosphene (Light Flash) perception by astronauts, – To study the effect of different shielding materials to reducing the radiation environment. For this purpose the Alteino equipment already on orbit will be used – Characterize the magnetic environment inside the ISS. – To perform a first test in space of a sensor capable of monitoring with high accuracy the short time stability of the Vabn Allen belts, to study the possibility of precursor earthquake related phenomena. 23/09/2004 Safety TIM 3
ISM- LAZIO Experiment description • To meet these goals we plan to realize a high performance cosmic ray detector, LAZIO/SIRAD, to measure and identify all particles traversing the detector separating nuclei from electrons/positrons, in the energy range ~10 to ~100 Me. V. It will record their time of arrival, their line of arrival (pitch angle), their direction of arrival. A very important feature of LAZIO/SIRAD equipment is its very large aperture (~60 cm 2 sr ) which will allow to perform accurate, real time measurements of the pitch angle distribution within short time intervals (from few seconds to few minutes depending on the position on the orbit). • LAZIO is equipped with a high precision low frequency magnetometer, which will be used to measure the intensity and the variations of the magnetic field within the ISS, in correlating these measures with the measurements of the particle fluxes. 23/09/2004 Safety TIM 4
ISM- LAZIO Experiment State of the Art • Electronics boards exists for Silicon and Trigger readout and power, to be refurbished. • Silicon detectors are being refurbished. • Trigger hardware is being built by the Russian partners. • Magnetometer boards are being developed (if late, they will not be installed). • Mechanics being designed and qualified. • PC based on PC 104 plus commercial series. 23/09/2004 Safety TIM 5
ISM- LAZIO Experiment hardware: 23/09/2004 Ite m Qty Description Dimensions l x b x h or lxd Mass [kg] 1 1 Main Electronics Box (MEB) 45 x 30 cm 3 20 kg 2 1 Power supply cable 150 x 2 cm 2 0. 4 kg 3 1 Magnetometer Head (MH) and Magnetometer box (MB) with cables connected MH 40 cm long MB 8 x 15 x 20 cm 3 0. 5 m (cable MB to LAZIO) 2 m (cable MH to MB) 2. 0 kg 4 1 Box grounding cable 150 x 2 cm 2 0. 4 kg 5 40 PCMCIA cards tbc 2. 0 kg 6 5 USB pen tbc 0. 3 7 1 Voice cassette recorder, model Olympus S 830, with control stick and cable 12. 1*5. 85*2. 67 cm 0. 19 8 8 Cassettes for voice recorder tbc 0. 280 9 5 Photo memory stick tbc 0. 2 10 2 Alkaline AA replacement batteries tbc 0. 022 11 2 Shielding tiles 8 x 8 x 4 cm 3 0. 35 12 1 Light shielding Mask (such as those used on airplanes) 2*2*1 cm 3 0. 05 Safety TIM 6
ISM- LAZIO Experiment LAZIO Main Electronic Box 23/09/2004 Safety TIM 7
ISM- LAZIO Experiment MEB hardware: • The MEB contains: – the ionizing radiation detectors: • silicon detectors • plastic scintillators – the experiment electronics: • data acquisition • power supply • on board computer (PC 104 architecture) – On board software • The MEB acquires and store data on internal PCMCIA high density cards. 23/09/2004 Safety TIM 8
ISM- LAZIO Experiment Main Electronic Box hardware • The E-box consist of a bottom part and of a cover made of aluminium alloy (AL 7075) with Alodined 1200 bolted together by means of ? ? screws. • The PCB’s are mounted on top of each others by means of bolts and spacers between the pcb’s. • The E-box housing is a vented container. Indicate how many vented holes • A power cable connect the electronic box to ISS – (28 +/- 0. 5 V – 1. 5 A in nominal conditions) 23/09/2004 Safety TIM 9
ISM- LAZIO Experiment 23/09/2004 Safety TIM 10
ISM- LAZIO Experiment 23/09/2004 Safety TIM 11
ISM- LAZIO Experiment 23/09/2004 Safety TIM 12
ISM- LAZIO Experiment Magnetometer box 23/09/2004 Safety TIM 13
ISM- LAZIO Experiment Voice recorder and its batteries 23/09/2004 Safety TIM 14
ISM- LAZIO Experiment Simplified Flight operations • • Extract the LAZ hardware from the Progress (30 min); install/connect the MEB, MB and MH. Connect the power cord to the ISS bus and the ground cord to the ISS chassis (60 min); Switch on the LAZ MEB and put on EVENT MODE; The PCMCIA need to be replaced when they are full of data. A blinking light will inform the astronaut that this operation is required (5 min); The magnetometer requires to be mounted in different directions every TBD days Once the mission is completed, the LAZ experiment will be switched from EVENT to INTEGRAL mode for additional data taking during the increment 11 (5 min). During incremente 11, every few weeks, the PCMCIA board should be replaced when filled (flashing light), and stored (10 minutes); When the Increment 11 is completed, less than 10 PCMCIA boards will be downloaded from ISS using the Soyuz. 23/09/2004 Safety TIM 15
ISM- LAZIO Experiment MEB Structural Safety and Verification • An hard mounting is foreseen during upload of MEB. All the rest of the items will be launched in a soft stowed pouch. • Designed to survive depressurization and repressurisation at a rate of 100 mm Hg/s. Indicate for how many times? Do you foresee to produce a fatigue analysis? • Verification • • • 23/09/2004 Structural Verification Plan Structural analysis Fracture control plan Fracture control report Fastners integrity plan Vibration tests Safety TIM 16
ISM- LAZIO Experiment • MEB fusing, grounding, bonding & inhibits – Electrical shock • Describe grounding philosophy – redundant grounding with Pin and grounding strap? • High DC voltage: Secondary voltage greater than 32 V Indicate all the voltage levels you have. – Hazard controlled by galvanic insulation and DC/DC converter which is fully enclosed in the electronic box. Crew access is not possible. Is this correct? – Mating/demating: Indicate how many connectors to mate and demate you have. In case the fuse blowing current is above 3 A you need an upstream inhibit: Mechanical switch at 28 V inlet Indicate also that the wire sizes will according to interpretation letter TA-92 -038 23/09/2004 Safety TIM 17
ISM- LAZIO Experiment • MEB electrical ISS interfaces 23/09/2004 Safety TIM 18
ISM- LAZIO Experiment • MEB Grounding/Bonding diagram 23/09/2004 Safety TIM 19
ISM- LAZIO Experiment • MEB Electrical circuit diagram 23/09/2004 Safety TIM 20
ISM- LAZIO Experiment • MEB Human factors – touch temperature • Nominal consumption power: 42 W • Thermal design: Passive or active describe little bit thermal design • The touch temperature of the MEB surface is < 49°C under the worst case conditions (specify worst case conditions – how many failures? ) see thermal analysis ref number • Any protection circuit? Thermal sensors? • Verification – Thermal analysis 23/09/2004 Safety TIM 21
ISM- LAZIO Experiment MEB Electromagnetic and other radiations • EMC tests will be performed in flight configuration in accordance with SSP 30238 and IFOC annex 1 MEB Sharp edges, corners and protusions • Designed and inspected for compliance with NASA-STD 3000 / SSP 505005 23/09/2004 Safety TIM 22
ISM- LAZIO Experiment • Lithium battery for PC 104 (safety aspects and qualification) – Make a description: which type of lithium batteries button cell? They are not in the PCB – Qualification (It is valid in case C< 300 m. Ah otherwise a unique hazard will be generated): • Open voltage test • Loaded measurement before and after leak test 23/09/2004 Safety TIM 23
ISM- LAZIO Experiment • Alkaline batteries for voice recorder(safety aspects and qualification) No particular problems if they are pure alkaline, they are less than 6, they are Dsize or smaller, they are in serires configuration or in parallel configuration. No series/parallel 23/09/2004 Safety TIM 24
ISM- LAZIO Experiment Limited Life Items • Indicate the list if already known 23/09/2004 Safety TIM 25
ISM- LAZIO Experiment Flammability • MAPTIS related materials will be selected where possible. DML will be submitted to ESA for approval 23/09/2004 Safety TIM 26
ISM- LAZIO Experiment Maintainability • Maintainability is not foreseen on orbit 23/09/2004 Safety TIM 27
ISM- LAZIO Experiment Alteino equipment to be used in this experiment • The warranty period of Alteino needs to be checked Did you check, Can we give a final answer to the safety panel? • The Shielding tiles will be fixed (in which way? ) to Alteino detector – Flammability potential hazard 23/09/2004 Safety TIM 28
ISM- LAZIO Experiment • Flammability assesment for shielding tiles – Any idea how to control this hazard. No possibility to put some kind of not flammable coating? 23/09/2004 Safety TIM 29
ISM- LAZIO Experiment Hazard reports • STD HAZARD Report N° : STD-LAZ • UNIQUE HAZARD Report N°: • LAZ-01 : Structural failure • LAZ-02 : high DC voltage • LAZ-03: Batteries in case you are out of the requirementioned previously 23/09/2004 Safety TIM 30
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