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Task/ Goal

Detector Configuration

Installation in sample chamber/ sample type

X-ray beam

parameters

Details of the test

Time estimation

assuming that detector, DAQ and control systems are STABLE.

1

Timing scan I → find X-ray signal on the detector

 

Goal: see X-rays on the detector :), make sure that primary beam does not hit the detector

 

pattern file: /scratch/xctrl/agipd_config/patterns/2xray_64cbi.txt

bunch structure file: /scratch/xctrl/agipd_config/patterns/bunch_patt_burst64.txt (it is a bunch structure without any veto)

 

Trigger mode = 1

For the safety reason, Marc suggested to start with Cu target and low transmission

Start with 1 pulse

 

- run with maximum number of pulses as soon as it is confirm that the beam is not hitting the detector

do timing scan  starting from the  current value

step size: 5 clock

- collect data with number of trains per step: 500

 

 

 

 

> < 2  hours

(if everything goes well)

In case we have a problem to find a  beam on Detector it can take much longer

2

Timing scan II -  fine tuning of the timing,

 

Goal:

collect data for high, medium and preferably low gain stage to investigate performance of image and gain switching effects for arrival  of the X-ray pulse at different time in the AGIPD integration window

attern file: /scratch/xctrl/agipd_config/patterns/2xray_64cbi.txt

bunch structure file: /scratch/xctrl/agipd_config/patterns/bunch_patt_burst64.txt (it is a bunch structure without any veto)

 

Trigger mode = 1

LiTi sample

- attenuators

 

Maximum number of pulses

 which can be readout by AGIPD detector

 

number of steps: -24 to +24 clocks

around the value which was found in Task 1

- step size: 1 clock

- number of trains per step : 1000

 

in case, we do not have all pulses, but only one pulse,  the test has to be repeated for memory cell 36 and 68 at least for 24 steps (-12 to +12 steps around the current value).

Sample preparation (2 hours) + tests (2-3 hours)

 

4-5 hours

 

3

Test AGIPD internal  and external VETO patterns

 

Goal: get X-ray images in the row w/o any “empty” images in between

pattern file: /scratch/xctrl/agipd_config/patterns/2xray_64cbi.txt

 

bunch structure file:

several patterns

 

Trigger mode = 1

LiTi sample

- attenuators

Different configurations

 

- 1 pulse (1st)

- 2 pulses

- 3 pulses

- 10 pulses

- max. number of pulses -1

- maximum number of pulses

 

 

 

Take data for different VETO configuration and beam configurations and check if the number of X-ray images corresponds to the number of XFEL pulses and the X-ray images are visible on the expected position in the file (check pulse and cell ID numbers

- number of trains per configuration : 500

2-3 hours (because changing each of the bunch structure pattern required power cycle the detector)

4

Tune AGIPD parameters ( Integration window, reset time, ect..) with the beam

 

Goal:

Optimize the detector parameters and fix them for the next User Experiments

 

pattern file:

several pattern files prepared with new configuration

 

bunch structure file:

bunch patterns with VETO and w/o VETO

 

Trigger mode = 1

LiTi sample

- attenuators

Maximum number of pulses

 which can be readout by AGIPD detector

Take data for different configuration of the detector

- number of trains per configuration : 3000

 

 

 12 hours

(~ 1 shift)

5.

Detector performance vs. bias voltage

Goal: study the detector performance vs. bias voltage

 for different intensities

pattern file:

- pattern file with optimize configuration from Task 4

 

bunch structure file:

bunch patterns  w/o VETO

 

Trigger mode = 1

LiTi sample

- attenuators

 

 

 

Maximum number of pulses

which can be readout by AGIPD detector

 

- Optimize intensity in the way that we can cover all gains, i.e. we should have ROIs with high, med. and low gains.

Take data for different bias voltages

V=300 V

V = 350 V

V= 400 V

V= 450 V

V=500 V

V=550 V

- number of trains per configuration : 3000

2-3  hours

6

Flat fields scan for all gain including single photons for agipd configuration to be used during User Experiments in March/April

 

 

Goal: get calibration data for all  AGIPD configuration to be used during User Experiments) and at least 3  intensity points per gain stage

 

pattern file:

- pattern file with optimize configuration from Task 4

 

bunch structure file:

to be decided,  based on the results from the previous tests,  it should be a configuration for the next User Experiments in March

 

Trigger mode = 1

 Cu target

attenuators

 

 

Maximum number of pulses

which can be readout by AGIPD detector

- scan from singe photon to maximum intensity ( to access med. and low gains) with different attenuators

steps:

1.  average intensity ~ 0.1 photon per frame per pixel

2. average intensity ~ 1 photon per frame per pixel

3. average intensity ~ 5-10 photons per frame per pixel

4. average intensity ~  50 photons per frame per pixel

5.   average intensity ~ 80-100 photons per frame per pixel

6.  average intensity ~ 200-300 photons per frame per pixel

7. average intensity ~ 500- 600 photons per frame per pixel

8. average intensity ~ 800-1000 photons per frame per pixel

9.  average intensity  >  1500 photon per frame per pixel

10. average intensity  ~ 3000 photon per frame per pixel

 

- min. number of trains per step: 10000 trains for step 1

5000 trains for step 2-3

3000 trains for steps 4-8

1000 trains for steps 9-10

Total: ~40000 trains with X-rays

 

 

 

 

 

 12 hours ( ~ one shift)

 

 

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