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Proposed Beam Time Schedule for March 2018

 

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

gain stages, i.e. we should have ROIs with high, med. and low gains.

Take data for different values of  bias

voltagesV=300

voltage

and delays (-2 to +2 clocks around the value which was found in Task 2)

V= 500 V

V =

350 V

450 V  →  to be removed in case we are short with time

V= 400 V

V=

450 V

350 V  → to be removed in case we are short with time

V=

500 - number

300 V

V=550 V

-Number of trains per configuration : 3000

2-

-Total number of trains: 25 (15)x 3000

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)