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$ bqueues | grep ps psnehhiprioq 117 Open:Active - - - - 0 0 0 0 psfehhiprioq 117 Open:Active - - - - 0 0 0 0 psnehprioq 116 Open:Active - - - - 0 0 0 0 psfehprioq 116 Open:Active - - - - 0 0 0 0 psnehq 115 Open:Active - - - - 0 0 0 0 psfehq 115 Open:Active - - - - 520 276 244 0 psdebugq 114 Open:Active - - - - 0 0 0 0 psanaq 112 Open:Active - - - - 7466 6612 854 0 psnehidleq 70 Open:Active - - - - 96 0 96 0 psfehidleq 70 Open:Active - - - - 104 0 0 104 psanaidleq 70 Open:Active - - - - 552 432 0 120 |
At the time of writing this documentation, psanaq is quite busy processing 7466 jobs. 6612 jobs are pending. 854 jobs are currently running. For more information on which queue you are allowed to use, see Submitting Batch System Analysis Jobs
Click "Launch peak finder”. You can check the status of launched jobs by typing "bjobs" in your Terminal. This will display the job ID and the status amongst other information.
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Once you are happy with the detector geometry and indexing parameters, you can click "Launch indexing”.
- Run(s): 10
- Sample name: lysozyme
- Queue: psanaq
- CPUs: 24
- Keep CXI images: On
Indexing will take some time to complete. If successful, you should see a stream file in: /reg/d/psdm/cxi/cxitut13/scratch/<username>/psocake/r0010/cxitut13_0010.stream
You can check the status of your indexing job here: /reg/d/psdm/cxi/cxitut13/scratch/<username>/psocake/r0010/status_index.txt
Psocake saves the detector images of only the hits in the .cxi file. It is likely that you may want to reindex these files to optimize the indexing rate. If you anticipate that you have finalized the indexing parameters, set 'Keep CXI images' to Off. It will delete the detector images in your .cxi file which will free up your precious disk space for doing other things.
As with peak finding, you can launch indexing jobs on multiple runs by specifying runs in the Run(s) field.
Indexing multiple lattices
CrystFEL can index multiple lattices per image. Set "Extra CrystFEL parameters" to --multi,--no-check-peaks. This will enable "subtract and retry" method.
Indexing pump-probe experiments
In a pump probe experiment, it is sometimes desirable to index only certain events, e.g index only the pumped crystals. This information is recorded in the EVR which psocake saves in the .cxi file.
So if you want to index only the hits with laser on (say EVR1: 182), then type the following in the "Index condition" field:
182 in #evr1#
Psocake will also accept combinations using AND/OR:
182 in #evr1# and 173 in #evr1#
You can attach a tag to the stream filename by using the "Tag" field, e.g. evr182 would produce cxitut13_0010_evr182.stream.
Detector centering
Let's check whether your detector is well centered with respect to your beam. You want the centre to be as accurate as possible (at least to a pixel accuracy) for high indexing rates (>40%).
Load the powder rings generated by clicking the "Load image" button in the Image Control panel. Open "cxitut13_0010_maxHits.npy". Adjust the intensity as necessary.
Draw resolution rings by ticking "Resolution rings" in the Diffraction Geometry panel. You can change the ring resolution by typing number in "Resolution (pixels)". Type 165 and see whether your powder rings overlap with the resolution rings. If they do, then the detector is centered. If not, then you can click on the "Deploy automatically centred geometry" to recenter your detector. If you are unhappy with the results, you can use "Deploy manually centred geometry" which will shift the detector centre to the centre of the green ROI circle.
Since we are at run10, the newly deployed geometry file is named 10-end.data. If there already exists a geometry file with the same name, it will be renamed to 10-end.data-<timeModified>
Jumping to indexed images
Once you have completed indexing a run, you may want to look at the indexed events.
In the small data panel, type the CXIDB filename:
- filename: /reg/d/psdm/cxi/cxitut13/scratch/<username>/psocake/r0010/cxitut13_0010.cxi
- dataset: /entry_1/result_1/index
You can click on the red marker in the plot to jump to the corresponding events.
Once you are satisfied with indexing all your runs, please remember to backup your .cxi files in the /res directory of your experiment. The scratch folder will get wiped after few months (Data Retention Policy).
The stream file is small enough to transfer back to your institute for post-processing (CrystFEL tutorial) and phase retrieval (PHENIX).
For phase retrieval, you can use Phenix and CCP4 by sourcing the following lines:
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# Phenix source /reg/common/package/phenix/phenix-1.10.1-2155/phenix_env.sh # CCP4 source /reg/common/package/ccp4/ccp4-7.0/bin/ccp4.setup-sh # XDS is available here /reg/common/package/XDS-INTEL64_Linux_x86_64/ |
For viewing the electron density, use coot contained inside phenix.
Beam Parameters for Publications
You can use psana to retrieve EPICS variables that are used in SFX publications, such as the pulse energy and the number of photons per pulse.
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ebeam = ebeamDet.get(evt) pulseEnergy = ebeam.ebeamL3Energy() # MeV es = psana.DataSource.env().epicsStore() calculatedNumberOfPhotons = get_es_value(es, 'SIOC:SYS0:ML00:AO580', NoneCheck=False, exceptReturn=0) * 1e12 # photons |
Bug/Comments:
Please send bug reports/comments:
Tiny url for this tutorial: http://tinyurl.com/zj4m23n
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