First results from the Biocams J. Brunner

Cameras on floor 1 and floor 5 together with an OM and an ADCP Floor 1 –80m above sea floor Floor 5 –270m above sea floor –~floor 13 normal line Installation on IL07

Camera AXIS221 vidéosurveillance Night view capabilities View field up to 90 degree Sensitive into infrared View field & focus can be set manually Diaphragm & exposure time automatically / remotely controlled Data output Ethernet Power 12-24V, 5WControl of external device

IR Source Absorption in water less than 1m – no interference with PMTs on other lines ~60 LED 850nm Can be controlled (switched ON/OFF) by camera

CPPM Test setup for water tests Final mechanics frame to hold camera And IR source (not yet mounted)

Mounting on OMF (floor 5) Try to maximize overlap of field of view between camera and OM

Electronics from CPPM CAMETHCAMPOW Conversion of Ethernet signals From electric to optic Power supply and IR control

Combined tests with ISIT ISIT IR AXIS ISIT : intensified silicon intensifier tube University Aberdeen 1995, 20,000 Euro Claimed sensitivity ~ lux Bacteria sample

Combined tests with ISIT Bacteria sample AXIS AXIS, IR ON ISIT

Tests with OM Camera and IR source 850 nm Box for laser calibration OM with PMT Image taken with PMT HV on And IR on Counting rate PMT ~ 10 Mhz  Second IR source 940nm To avoid interference with PMTs

Test with laser laser OM Splitter 16x Diffuser Geometrical factor 0.1 Camera lens Hz Integration variable 1cm 2

Test with laser AXIS 1sec AXIS 1/25sec ISIT 1/25 sec lux lux ISIT ~ factor 20 more sensitive ; AXIS better resolution Missing sensitivity can be compensated by longer exposure time Worst case scenario : isotropic light (as from K40) PMT 1MHz = 10 8 photons/m 2 /sec = lux Expect to see pointlike signals at few MHz depending on geometry

Deployment July 2007 Floor 5 Floor 1 ADCP Camera OM ADCP Camera OM

Connection Dec 2007 Floor 5 Floor 1 ADCP Camera IR flash OM Camera

Data taking cameras –Connected to Windows machine antbiocamdaq (IMP) –Run in self triggering mode (motion detection) –IR flash activated when triggered –Camera floor1 : large “excluded areas” to avoid self triggering –Data saved on local disk –Triggered images manually copied to CPPM –Exposure time lowered from initially 2 secs to now 0.2 secs –Motion detection trigger tuned to maximize sensitivity

Data taking cameras –Manual triggers possible via web interface by switching ON IR flash for few secs –Manual triggers are recorded (exmaple below) – :47: "IR floor 1 manual" – :19: "IR floor 1 manual" – :21: "IR floor 1 manual" – :06: "IR floor 1 manual" – :21: "IR floor 1 manual" – :13: "IR floor 1 manual" – :13: "IR floor 1 manual" – :10: "IR floor 1 manual“ –First result : IR light totally invisible to PMTs (orientation, water absorption ?) for both wave lengths –Alternative DAQ mode always active (store all images) IR always ON –Useful to study currents, “snow” density

Data taking OMs & ADCPs –Independent run control with customized clock, dfilter, dwriter –Acou-clock provided by Max Neff to avoid interference with main run control (counter measure for clock broadcast commands) –Data saved at Lyon as for normal runs Only SummaryTimeslices written Only ARS 0 read 13msec Frametime 20 hour runs : ~70 Mbytes per run –Online monitoring : only 1 ratemon

Run Control All processes can run on a single machine (currently pollux)

Examples of bursts

Time distribution camera triggers 15 triggers from floor 5 1 trigger from floor 1 No striking correlation with burst fraction

Examples floor floor5

Examples floor floor5

Examples floor floor5 OM floor 5 not anymore operational Under investigation

Examples floor5

Status Both cameras + IR flashes work well Lost 1 OM IR 940nm to far infrared to be useful Self triggering of cameras works fine Independent running with OMs works fine Sensitivity sufficient to see bioluminescent events

Future Continue data taking in self trigger mode Develop external trigger (from OMs) Improve self trigger for floor 1 –(trigger dead time, help needed from AXIS) Try to resurrect OM floor 5 Analyze camera events (help needed) Analyze L0 count rates (help needed) –Burst shapes –Total charge seen by PMTs Possible data taking periods with light ON –to study sea currents –oscillations of lines –snow density