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= Datataking Procedures

== First Drs Calibration

**Notice:** dimscript for this procedure: !ScriptsForDimCtrl/FirstDrsCalibration.dim

**Remote-datataking:** In case of remote data-taking this section can be skipped. In this case you can directly open the lid, and start with the data-taking including the DRS calibration.

0. Do _Start_ (DRS Calibration) in the fad-tab
0. Take *DRS: Pedestal* (1000 events)
0. Take *DRS: Gain* (1000 events)
0. Take *Pedestal* (1000 events)
0. Switch to FITS file format in the fad-tab
0. Take *Pedestal* (1000 events)
0. Switch on the temperature control (Feedback-tab: *Start*, *Enable output*)
0. Switch on the BIAS voltage (Set the global offset to one DAC count in the Bias tab and wait until the temperature feedback has ramped the voltages properly)
0. Take *Pedestal* (1000 events)
0. Switch off the bias voltage (*Set all to 0*)
0. Open the lid

== Normal Datataking

0. Move the telescope to wobble position 1
0. Make sure Bias voltage is off
0. Do _START_ (DRS Calibration) in the fad-tab
0. Take *DRS: Pedestal* (1000 events, MCP *Start Run* on GUIs left side)
0. Take *DRS: Gain* (1000 events)
0. Take *DRS: Pedestal* (1000 events)
0. Switch to FITS file format in the fad-tab
0. Take *DRS: Pedestal* (1000 events)
0. Take *DRS: Time* (1000 events)
0. Do _RESET_ (DRS Calibration) to reset the secondary baseline in the fad-tab
0. Take *Pedestal* (1000 events)
0. Switch to FITS file format in the fad-tab
0. Send somebody out at the backdoor to measure the the sky-brightness with the sky-meter at the rough direction the telescope is pointing and write it down in the logbook
0. Take *Pedestal* (1000 events)
0. Switch Bias on (set to one DAC count and wait for the feedback)
0. Take *Pedestal* (1000 events)
0. Take *External light pulser* (1000 events)
0. Take data with full trigger area (four times 5 minutes)
0. Move the telescope to wobble position 2
0. Send somebody out at the backdoor to measure the the sky-brightness with the sky-meter at the rough direction the telescope is pointing and write it down in the logbook
0. Take *Pedestal* (1000 events)
0. Take *External light pulser* (1000 events)
0. Take data with full trigger area (four times 5 minutes)
0. Go on with the beginning of the data taking procedure

== ratescan

0. Track a dark region
 - low zenith (<30°)
 - no bright star
 - no direct moonlight in the camera
 - examples
  - around 0:00 UTC: ra = 13.46667, dec = 27.12833
  - around 4:00 UTC: ra = 21.45, dec = 14.9
0. Take a run with type ratescan with unlimited event and unlimited duration (for configuring all programms)
0. Ratescan/START_THRESHOLD_SCAN x y c

variables:

- x: start threshold
- y: end threshold
- c: stepsize (if negativ ratescan starts with |c| and handle it dynamically, if the ratescan needs too much time)

Configuring manually:

- Stop ratecontrol (I'm not sure if this is necessary)
- ftmctrl/SET_DEAD_TIME 0 (in fact thats the minimum equal to 8ns (you can also set this value in the GUI)
- GUI: no interleaved pedestal, no interleaved extLP, only physic triggers

== Ampl. vs Bias measurement

1. Track a dark region (same requirements as for the ratescan, see above)
1. Do a DRS calibration
1. Feedback/Start_Current_Control -1.0 (maybe Enable_Output yes)
1. wait for 2 - 3 feedback voltage corrections
1. switch to fits format
1. Now take an external lp run with 1000 events
 - be aware that for x = -1.0, -0.9, its possible to trigger 0 events. Than you can go on with the next overvoltage
1. Increase voltage offset by 0.1 V go on with the next light-pulser run
1. do this until +0.5 V offset

Write down following in the logbook:

- Offset
- median Voltage
- median Current
- runnumber

== Dim Scripts

In FACT++/!ScriptsForDimCtrl you will find the following scripts that could do parts of aboves procedures automatically.

||= script_name =||= function =||
||  \\!FirstDrsCalib.dim\\ || taking a first DRS calibration as described above ||
||  \\DataTaking1.dim\\ || procedure from step 2 to step 18 ||
||  \\DataTaking2.dim\\  || procedure from step 21 to step 23 (which btw. is the same as step 16 to step 18) ||
||  \\!ResumeDataTaking.dim\\  || can be used if Datataking crashes during the first of a 4x5min run set to take 4 runs of  5 mins in a row ||
||  \\Take<source_name>.dim\\  || procedure from step 1 to 23 with for Source <source_name> (2 Wobble positions) ||
||  \\!AmplVsOv.dim\\  || do steps 2 to 5 of the Amplitude vs Bias measurement with an overvoltage of x ||

Scripts can be started from a bash: 

- dimctrl --batch !ScriptsForDimCtrl/<scriptname>.dim 

Scripts can be stopped via dimctrl --stop in a bash

if you want to only take the second wobble position the script can be started by: //.x !ScriptsForDimCtrl/Take<source_name>:2//

scripts available for the following sources:

||= source || <script_name> =||
|| \\Crab\\ || !TakeCrab.dim ||
|| \\Mrk421\\ || TakeMrk421.dim ||
|| \\Mrk501\\ || TakeMrk501.dim ||
|| \\1ES1218+304\\ || Take1218.dim ||