1. Instrument Control Systems 2014
ESPRESSO TCCDs

2. Field and Pupil Stabilization
Field stabilization: maintain the object centered on the fiber during the whole duration of the scientific exposure
Pupil stabilization: maintain the pupil stable during the observation
Devices involved in FPS:
8 TCCDs (2 for each F/E arm, one for FS and one for PS)
8 F/E piezo tip-tilts (2 for each F/E arm, one for FS and one for PS)
4 ND filters
(1 TCCD for EXPM)

3. Acquisition & Field and Pupil Stabilization GUI (1 UT and 4 UT cases)

4. FS sequence diagram

5. FPS TCCD Standard VME-based ESO TCCD not adopted:
Cost (~30 k€ for each TCCD)
ESPRESSO electronics based on PLCs
Trade-off among different TCCD brands:
Apogee Aspen CG285:
Overlap mode produces corrupted images
Jitter in frames arrival time
Power supply connector problem
AVT Manta G145B NIR
AVT Bigeye G-132 B cool (adopted, better performances than AVT Manta)

6. TCCD Device Driver will be provided by ESO
(images from ESO document: Technical Detector Control Software for COTS Cameras - Design Description)

7. TCCD device driver Temporary TCCD Device Driver implemented by OATs
New boss interface created (bossINTERFACE_3GTCCD)

8. TCCD performance tests
Minimum requested correction frequency needed to reach the required stability and precision: 3 Hz
The TCCD acquires the images in continuous loop with ExpTime = 0.1 sec
The acquired image is transferred to the shared memory
A client process takes the image from the shared memory (when ready) and writes the Δx and Δy corrections in the On Line Database
The elapsed time between 2 consecutive OLDB writings is computed

9. TCCD performances

10. AVT Bigeye performances

11. AVT Bigeye performances