Calibration in the Dark Room

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Calibration in the Dark Room

• Greg Hallewell / CPPM

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Contents

• What to calibrate in dark room?
• Equipment needed
• Deployment Schedule
• Latest schedule ? deploys 12 lines (60
  Sectors) between 07/05 02/07 ? 1
  line (5 sectors) every 6 weeks
• ? 1 sector / week
• ALSO (rehearsal)
• PSL2 Deployment 12/04, MILOM 03/05
• (MILOM PSL2 Connection 03/05)
• Parallel integration, calibration testing _at_ 2
  sites

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Calibration Tests at Integration Time

• Can test only one sector at a time
• PMT Time Delay Calibrations using Nanolase 534nm
  lasers for each OM
• Analog (Time Charge (?)) Measurements for ARS
• ARS analog parameters and linearity data
  already in DB
• Compass/Tiltmeter Calibration/Tests
• Compasses pre-calibrated in factory no
  calibration tests before sea deployment (see
  3INS N02 02A, P. Keller V. Bertin 11/02/2004)
• Tiltmeter offset ONLY to be calibrated wrt
  vertical with OMF held in simple jig decision
  09/03/2004 P.Lagier, P. Lamare, G. Hallewell)
• Measure delays in Sheffield pulsers in each OM
  for
• later PMT Transit Time measurement ( 60ns)
• Offshore FPGA Coincidence trigger (Yes/No/How?)
• Hydrophone Tests (?)
• Transponder/hydro in contact in air, connected to
  clock system? Measurement of XMIT and RCV
  offsets?

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Assumptions

• Start point July 2004 (?)?LCM electronics PRR
• Qualification (thermally, mechanically)
  stresses modules beyond norms of operation and
  production testing
• Basis IFREMER protocols
• includes soak cycles ? 40ºC, 15g/15ms
  shock test
• Deployment electronics will be identical to
  that of the qualified LCM ? burned in
  vibrated(?) according to agreed protocol but not
  qualified!
• Modules sent from LCM integration sites to line
  integration sites will be fully functional,
• but not calibrated

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Integration, Testing Pathways
Production LCM integration testing
Bari
Pisa
Catania
Line Integration testing
Saclay
CPPM
Shallow water testing
Foselev Marine Hangar?
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Site operations
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Needs
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New Infrastructure _at_ CPPM Hall 3/04 ?
16-split
Storage zone Integrated Tested For
stories/sectors
Direction of movement of integrated sectors
Integration Zone/ Fibre-optic fusion splicing
SPM/SCM /BSS
1 fibre
2 DAQ, 2 Clk fibres
ex ATLASLAND (storage)
New Control Room
DWDM Clock
Laser atten
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New Control Room Layout
Swirch ethernet. Circuit 1
Cabinet
Swirch ethernet. Circuit 2
Sink
Room 1 laser
Room 2 Electronics
Cabinet
Table for LCM electronics
Clock Racks
Laser Black Box
Cabinet
Power 220V.
Needed Air Conditioning 2 kW (Room 1) 2kW
(Room 2)
PCs.
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Dark Room shortening completed April
21 Light-proofing and electric reinstallation now
in progress
New door
Length reduced by 2m
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System to measure time respoonses of OMs from
talk by Giovanni Lamanna

• Motivation (see thesis of Sonia Karkar)
•  Time calibration of the sectorline in the dark
  room 
• Modifications
• - move laser to new control room
  DONE
• - remplace flower pot optical nosebags by
• new system that doesnt require OMs to be
  mounted on OM frames IN PROGRESS
• - optimise the laser system
• 1) test strategy (t0 from the laser,)
• UNDER DISCUSSION
• 2) reproducibility of attenuation of
  beam intensity
• APPROACH CHOSEN

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t0
Filters
Attenuator
Nanolaser 532 nm, 1.3?J, FWHM 0.8 ns,
jitter 50ps
t2
t1
t3
from mezzanine
Optical fibres
Optical Splitter
20 Fevrier 2004 - Giovanni Lamanna
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System for light injection to OMs

• ABSORPTIVE NEUTRAL DENSITY FILTERS
• SPECIFICATIONSMaterial
  Grey ionically colored glass
• Thickness 1 to 3
  mmSize tolerance 0.15 mm
• Useful wavelength range 400 - 1100 nm
• Transmittance tolerance 10 _at_ 500 nm Max.
  temperature 250 C

20 Fevrier 2004 - Giovanni Lamanna
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Filtres to attenuate the laser
Typical transmittance of Absorptive ND Filters.
3 filters give 6 transmittance levels 13, 20,
25, 40, 50, 80, ()
20 Fevrier 2004 - Giovanni Lamanna
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Filter Supports
20 Fevrier 2004 - Giovanni Lamanna
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Dark Room Laser Calibration System Proposal
Clock System
Reference LCM
Pin diode
Laser
15 optical fibers (same length to 60ps 1cm)
split
40K, Biolum Simulation LED
LCM 1
LCM 2
LCM 3
LCM 4
LCM 5
3ARS MB, Clock Card, DAQ Card
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Why an external reference ARS/LCM?

• Calibration of Saclay CPPM Nanolase lasers
  wrt clock system
• Redundancy of measure of PM TTs (in
  conjunction with Sheffield pulsers)
• Easier calibration across sector boundaries to
  fill up CLOCK_PHASE DB table (dont need to
  elect a reference OM in every sector to
  measure relative to)

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Cross-Calibration of OM Sheffield Pulsers
Clock System
Need to know Time delay of each SP wrt clock
(if SPs are used to verify Hamamatsu 10 PMT
TTs) (Rise Time 1.8?2ns, FWHM 4.5?6.5 ns) Jitter
typically 200ps)
Reference LCM
LCM 1
LCM 2
LCM 3
LCM 4
LCM 5
3ARS MB, Clock Card, DAQ Card
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Fibreoptic Splitter Amplitude Division
(Arbitary reference laser power)
St Dev on charge /-0.9pC (4)
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Fibreoptic Splitter Time Delay of channel
outputs
St Dev /- 32 ps Source S. Karkar-thesis
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Calibration of ARS systems
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Time Calibration Strategy Proposal

• All OMs simultaneously illuminated (ie single
  length optical fibres 30 ARSs active)
• Step (1) After LCMs integrated
• (cables connectedoptical fibres fusion-spliced)
• Measure 2-way transit time to each LCM halve
  it for data to enter in CLK_PHASE table
  of data base 50 ps resolution
• (more quickly done with external reference)

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Time Calibration Strategy Proposal

• Work with SPEs Data format spe_item
• 1 byte header (which LCM/ARS)
• 3 byte timestamp (25ns resolution)
• TVC (1byte) precision 25ns/(8bitsv12) 30ps
• Charge (1 byte)

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Time Calibration Strategy Proposal

• ARS TVC calibration
• TVC ramps linear ? 255 over 50ns, but different
  slope origin for each TVC need calibration
  constants from/for DB (ARS_TVC_VALUES)
• Re-measuring can be done for free using noise
  to randomly populate across the TVC window (in
  principle need only 2 points for slope origin,
  but will have many more)

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Analog Calibration of ARS systems for DB
(ARS_AVC_VALUES, ARS_AVC)WILL PARAMETERS
(MEASURED _at_ SACLAY, BARE CHIPS) CHANGE WHEN ARSs
MOUNTED ON ARS MBs (parasitic C)?

• Differential non-linearity/saturation of SPE-like
  signals (Q)?
• Differential non-linearity/saturation of A/5
  signals?
• Differential non-linearity/saturation of Dynode
  12 (No)
• (A/16 signals)?
• Calibrations performed at Saclay
• Linear transfer functions need slope offsets,
  specific settings for each chip ADC_min value
  (offset)
• 6 Thresholds (Trig_0 thresh, PSD_thresh, Dyn_th)
  gates(18), gainsoffsets(16), walk correcting
  parameters
• ARS DNL (2x 256 parameters/chip put into data
  base)

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Decision taken at Valencia Calibration
Meeting(May 04) What to Calibrate in DR (1 of 2)
A Non-ARS parameters functional tests that can
be done outside of DR A.1 Clock Delays (to
CLOCK_PHASE) A.2 Reset of individual LCMs
through clock system A.3 ARS new reset through
clock B Non ARS parameters tests which need
DR B.1 Flash (all) OM LEDs ARSs in SPE mode (10
minute run) data to OM_LED-T0,
OM_LED_ANLG B.2 T0 Offset for LED beacon small
PMT data to LED_BEACON_T0, LED_BEACON_ANLG
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Decision taken at Valencia Calibration Meeting
(May 04) What to Calibrate in DR (2 of 2)
C ARS Timing /charge parameters C.1
Timesclice data (SPE mode) for TVC
calibration (10 minute run), data to
ARS_TVC_VALUES C.2 Low intensity Laser run _at_
1kHz, ARSs in SPE mode spe like events (signal
present 30 triggers) measure of T0, data to
ARS_T0 C.3 ADC Calibration (all on WAVEFORM
mode) Low intensity Low Threshold (0.3 spe
look for spe peak) ? High Intensity High
Threshold for multi-pe peaks Data to
ARS_AVC_VALUES C.4 Noise Study (WAVEFORM
mode) Random trigger, zero HV threshold set
to zero (fast run) Data to ARS_AVC_VALUES