Archeops 1999 Trapani Flight logbook
v1-990818
v2-990819 - modify landing and add bolometer 2 problem
v3-990906 - add Jupiter and Saturn

UT is defined by on board Archeops GPS and is linked to block number
with equation 1 by Gispert et al. note #1. UT is in decimal hours and
starts at 0h on the 17th July 1999. 
UT=8.0609925+0.00011673636*block_number
Local time is UT+2 or UT-22.

UT(h) Event
8.06  The on-board computer is switched on (block number 0) i.e.
       MJD0  1376.8358818 (modified Julian Day= JD-2450000)
13.95 The gondola crosses the bridge on its way to the launch pad
14.10 Test of stellar sensor and GPS
16.75 Instrument is ready on the onboard batteries. Waiting for readiness
  with meteo man
17.00 Open the balloon box
17.23 Starts the on-board recorder. Block number 078690
17.40 Test of pivot
17.63 ..direct+
17.65 ..direct-
18.17 Start pumping He in balloon (gondola shakes the cryostat to
  >800mK)
18.48 ASI GPS plotted on http://asintp.asi.it/
19.25 Stop He in balloon
19.37 Launch
19.57 pivot= direct+ to warm it up then stop
19.73 monitor stellar sensor (OK), gyros (OK), ch2-bolo4 has a funny
  noise, 4 other bolometers OK, ch2-bolo5 is out as before launch
20.00 GPS_ASI= 10km altitude. bolo4 is back. 572mK. Dinner time
21.00 GPS_ASI= 20km altitude. 
21.00 GPS thermostat starts regulation
21.33 pivot: regul+ 12 0 24 16  --> gyroz positive 12deg/s
  187mK (4000 Ohm) 4K 558 (Ohm) 1.6K 9850 10K 318, flow rates 8 and 24
  umoles/s
21.78 Drop ballast --> +2mK on dilution
  Ge=133mK, p_haut=35mBar= p(from balloon)+11mBar (=offset p_haut),
  waiting for valve opening at 30mBar
21.92 Try to turn at 3rpm=18deg/s. 18 0 24 16. successful
21.97 Valve opens. Dil goes up to 135 mK (10130 Ohm). 
  Hourrah. 10K 353 Ohm looking to empty space.

  Acquisition parameters (did not change during flight): 
  plafond nominal, flash nominal, helium 400s
  6.2 microsecond, 38 measures/ half-period, 8 dead-time, 156.2 kHz,
  6.51 kHz, f_modulation=85.7 Hz, f_sampling= 171.326754 Hz (at the
  internal quartz clock precision)
  From GPS processing: f_sampling= 171.326226 (hence quartz is better than
  6e-6)

22.00 GPS_ASI= 28.5km altitude. 
22.35 Pivot regulation tuning. 12mBar is 22 for p_haut
22.42 Dac_I= 500 on all bolometers (1.132 nA). Paolo computes that
  pendulation is less than 1 arcmin, rotation is 18.00+-0.02 deg/s needs
  2 Amp. 123.4 mK slowly decreasing. M-Christina says: in 20 min., 37 km
  altitude steadily increasing to 42 km by the morning.
22.62 Tune the electric transients on each detector (800)
22.70 Regulation on lHe bath starts at 0.9 bars (oscillations on
  several housekeeping parameters: flow rates and inside cryostat
  pressures, 10K and 4K stages...
23.00 GPS_ASI= 35.8km altitude. 
23.02 Richard's quick look: Galaxy is detected on all bolos, 50ms lag
  between b4 and b6 (about as expected).
23.33 37.5km altitude
23.45 113mK
  Change currents Dac_I= 375 (0.849nA). Housekeeping status is
  Ge: 114.13 (16746 Ohm) 4K: 6.24 (630.22) 
  1.6K: 3.16 (11550) 10K: 11. (361.18)
  3He: 11.6b,  7.94 um/s, 4.1b
  4He: 29.4b, 24.00 um/s, 4.11b
  Valve= 41.3, charb=-0.1b, membrane=0.007b haut=0.014b
  Trp=7.6V Dil=16.7V/-16.6V
  Bebo=7.9V/17.0V/-16.2V Ch=25.7V
  Temp_haut=20.9deg 16.2 Base 14.3 188.9
  Tube_He=-41.9deg Pile=7.5 Driver= 19

23.50 GPS_ASI= 38km altitude. Bolometers are not changed anymore
  (ie. start of clean data)
23.70 Dilution Temperature is stabilised
24.00 GPS_ASI= 39.2 km altitude. 
24.40 40 km altitude
24.42 Channel1-bolometer2 is out.
24.50 GPS_ASI= 40.2km altitude. 
25.00 GPS_ASI= 40.8km altitude. 
25.50 GPS_ASI= 41.3km altitude. 
26.00 GPS_ASI= 41.2km altitude.
26.50 GPS_ASI= 41.6km altitude. 
26.50 An already erratic telemetry is now completely gone
26.85 Jupiter is seen on all detectors (samplenumber from 11570000 to
  11595000) : Calibration source of 170 K, Dec=11deg, Angular
  diameters: 39.52 by 36.96 arcseonds.
27.55 Saturn is seen on all detectors (samplenumber from 10691000 to
  10728000) : Calibration source of 150 K, Dec=14deg, Angular
  diameters: 17.37 by 15.50 arcseonds.
27.67 Switch of batteries (from 7 to 4)
28.00 Sunrise (as observed on the 10K stage)
29.00 Good morning: the balloon is North of Alger at 41 km altitude.
31.53 Valve closes due to the Sun.
33.00 Archeops in Spain, North of Almeria
36.32 Separation (loss of data up to 36.70)
37.38 Landing (15h20m on the 18th of July 1999 local time) : Fax from
  Jefe area operaciones (INTA CEDEA): "La
  Barquilla del Globo ARCHEOPS ha caldo en las proximidades de Granja de
  Torre Hermosa (Badajoz) a las 15:20 Horas Locales, y en las siguientes
  coordenadas: 38d20'N, 05d34'W " 
37.41 loss of data up to 37.78
40.00 Recovery team arrives.
40.22 Cryostat is empty
40.68 On board recorder is full and stops at block 279543


There are 4h30m with stable instrument configuration and no Sun, of which 3h30m
are above 40km altitude. There are 3h30 with the valve still open but
with the Sun annoyance. 4 channels worked correctly until the valve closed.

Alain Benoit and F.-Xavier Desert