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DESIGN OF THE HATCH OF THE INSTRUMENT BOOTH OF EUSO-BALLOON version v1.2

DESIGN OF THE HATCH OF THE INSTRUMENT BOOTH OF EUSO-BALLOON version v1.2. Writer : SYLVIE DAGORET-CAMPAGNE. http://euso-balloon.lal.in2p3.fr/spip.php? article313. Purpose of the hatch. The hatch is a kind of box of 17 cm x 17 cm x 6 cm inside the top wall of the Instrument Booth.

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DESIGN OF THE HATCH OF THE INSTRUMENT BOOTH OF EUSO-BALLOON version v1.2

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  1. DESIGN OF THE HATCH OF THE INSTRUMENT BOOTH OF EUSO-BALLOONversion v1.2 Writer : SYLVIE DAGORET-CAMPAGNE http://euso-balloon.lal.in2p3.fr/spip.php?article313 Final tests and Health tests

  2. Purpose of the hatch The hatch is a kind of box of 17 cm x 17 cm x 6 cm inside the top wall of the Instrument Booth. During final tests and health tests the electronics of the internal booth is connected to external equipment to shunt : • SIREN which may not be available • Batteries to spare the cells Last checking tests are done to be sure the whole detector works as expected. Hatch open Final tests and Health tests

  3. Hatchclosed • For the flight, the cables to external equipments are removed, SIREN is installed definitely inside the IB, the connectors are plugged with the terminal plugs, the hatch box is closed. • The instrument works with SIREN and its own battery • The whole instrument booth (IB) has to be kept totally watertight even if splash fall in water Hatchclosed Final tests and Health tests

  4. Cableshaving to passthrough the hatch • The cables from both side are connected through a series of feedthrough connectors passing through the wall of the hatch box. • During the tests the active subsystems of IB are connected to the external equipments and for flight, the external cables are removed, the internal cables are kept in place and the feedthrough connectors inside the hatch box is ended by plugs. Final tests and Health tests

  5. List of feedthrough Final tests and Health tests

  6. External Test equipment Instrument booth HATCH BOX LED BNC LED Power supply BNC BNC BNC Scope Ext PM SHV SHV PM HV Computer PDM Soft PDM-B NI USB USB Ext Trig BNC BNC CPU ExternalTrig Ethernet Computer DP Soft DB9 DB9 plug DB9 DB9 SIREN Ethernet RS232 Open Drain RS232/ RS422 DB9 DB9 plug Computer HK Soft DB9 DB9 HK RS422 BNC BNC LVPS-HK Open Drain Analog Turn ON BNC BNC Motor Motor control SubD25 SubD25 External Power Supply 28 V, 5 Amp SUBD-25 SUBD-25 SUBD-25 SUBD-25 Batteries plug HATCH BOX

  7. Instrument booth HATCH BOX LED BNC BNC BNC BNC Ext PM SHV SHV IN Flight PDM-B NI USB USB BNC BNC CPU ExternalTrig Ethernet DB9 DB9 plug DB9 DB9 SIREN Ethernet RS232 Open Drain RS232/ RS422 DB9 DB9 plug DB9 DB9 HK RS422 BNC BNC LVPS-HK Open Drain BNC BNC Motor subD25 SubD25 SUBD-25 SUBD-25 SUBD-25 SUBD-25 Batteries plug HATCH BOX

  8. Hatch Panel Design Final tests and Health tests

  9. BACKUP Final tests and Health tests

  10. LED For Final Tests and Health Tests: • This is to put a stabilised voltage for pulsing with photons the PDM FS. • The feedthough has to be of good quality to avoid water entering inside the instrument. • Integrating sphere optional Final tests and Health tests

  11. External PMT For Final Tests : The purpose is to check there is no light leakage inside the Instrument booth. • Need to feed the voltage divider by HV (BNC-SHV) • Need to read the anode with lemo/BNC May be kept in-situe for health test to check LED is pulsing correctly Final tests and Health tests

  12. PDM-B • This is to read the PDM-B directly on a PC to perform special studies that shunt the DP. • This is optional but probably usefull for debugging during final tests (not health tests). • It is possible to select the Data Output of the PDM-B by a command from DP. • This requires to have the NI inside the IB (instrument booth). • The question is can we find a watertight USB plug for flight Final tests and Health tests

  13. CPU Ethernet • To be watertight the usual RJ45 Ethernet connector will not be used. We should use a DB9 feedthrough. • In Flight : A plug DB9 is used to loop back to SIREN Ethernet. External Trigger • For final tests, like PDM-FS position adjustment with a motor, the CPU-DAQ is triggered externally • A BNC/lemo is proposed with the most watertight solution proposed. Final tests and Health tests

  14. HK RS422 : • We will use a DB9 feedthrough (watertight). • In Flight : A plug DB9 is used to loop back to SIREN RS422/RS232. Final tests and Health tests

  15. LVPS-HK • This is the port through which the instrument start to be turned on. • This is an analog signal on open drain from a dedicated SIREN output. • The proposed connection is through BNC/lemo (depending on watertightness) • This connection is doubled to loop back from SIREN to LVPS HK during the flight Final tests and Health tests

  16. Motor • DB25 connector is enough Final tests and Health tests

  17. Open points • The hatch panel has still to be confirmed in the 15th meeting • The choice of the feedthrough has to be done according compromises on: • Price/ connector quality • Full Water tightness for sea landing • Reusability during the same flight campaign • No idea about the turn on off HVPS ? Final tests and Health tests

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