[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-detail-133536-en":3,"doc-seo-133536-105":31,"detail-sidebar-cat-0-en-105":84},{"code":4,"msg":5,"data":6},0,"success",{"doc_id":7,"user_id":8,"nickname":9,"user_avatar":10,"doc_module":4,"category_id":11,"category_name":12,"doc_title":13,"doc_description":14,"doc_content":15,"file_id":16,"file_url":17,"file_type":18,"file_size":19,"view_count":20,"is_deleted":4,"is_public":21,"is_downloadable":21,"audit_status":21,"page_count":22,"language":23,"language_code":24,"site_id":25,"html_lang":24,"table_of_contents":26,"faqs":27,"seo_title":28,"seo_description":14,"update_tm":29,"read_time":30},133536,962075114765,"Quinn","https://ap-avatar.wpscdn.com/davatar_a8503ba1806abce46bf441b54a3ca4cd",6,"Technology","I16 User Guide - Hard X-ray Beamline Experiment Control","I16 User Guide details the hardware and operation workflow for the I16 hard x-ray beamline at Diamond Light Source. It describes key components such as the Si monochromator, beamline optics with polarization control phase plates, the 6-circle kappa diffractometer, and photon-counting detection with rotation-stage polarization analysis. The guide explains controlling experiments via GDA (and recommended data acquisition flow), organizing and accessing stored data on the secure network, and executing core command examples and scan types including energy, HKL, and 2D mapping.","I16 User Guide  \n1. Introduction  \nI16 is a general purpose hard x-ray beamline at Diamond Light Source, Rutherford Appleton Laboratory, UK. The main components of the beamline are a single crystal Si monochromator, beamline optics (including phase plates for polarisation control), a 6-circle kappa diffractometer, a detector arm with a photon counting area detector and rotation stage for polarisation analysis. The diffractometer can support a number of sample environments such as cryostats, magnets and furnaces.  \n2. Controlling your experiment  \nBeamline motors, detectors and equipment are generally controlled through the program GDA on the beamline computers. Specific control of devices can be performed through EPICS, however this is not recommended for users. The computers use the linux operating system RedHat7, which is specially configured for use at Diamond Light Source. GDA can be run on any linux workstation in the I16 control cabin, however we normally use workstation i16-ws001 (the two monitors side-by-side, next to window looking into the experimental hutch) . GDA uses a command line and scripting environment using a Python based syntax. Data is plotted directly in GDA and all data is stored remotely, allowing you to access it from any other workstation.  \nEPICS – Motor control  \nGDA – Data Acquisition  \n3. Where Data is stored  \nExperimental data, including scan files, detector images and the log file are all stored on a secure network server.  \nThe file directory of the data will depend on your experiment number (mm\\#\\#\\#\\#\\#-1):/dls/data/i16/2022/mm12345-1  \nFrom GDA you can see your data directory using the command: datadir()  \nYou can access the data from any other workstation and you can back up your data using the I16 Data Dispenser. Data can be accessed remotely after your experiment for several months, after this the data is stored on the archive and can be accessed via the Diamond archive manager.  \n4. Basic Commands  \nIn GDA all available devices are controlled by “pseudo devices” that control motors, detectors etc. These devices can read back their position, move to a position or be scanned over a range. Here is an example, moving the diffractometer:  \npos shutter 1 \\# opens the x-ray shutter  \npos eta 20 \\# Moves eta to 20  \npos eta 10 delta 10 \\# Moves eta and delta simultaneously  \ninc eta 1 \\# Increments eta by +1 degree  \npos pil3 1 \\# takes an exposure with the Pilatus detector  \npos eta \\# display the current position  \n5. Scan Commands  \nThere are two main types of scans of devices, centred and absolute. Both move to a position and perform an action at each point. Data from scans is stored in the experiment directory.  \nscan device start stop stepsize read-back-device(s)  \nscancn device stepsize steps read-back-device(s) For example:  \nscan eta -1 1 0.02 w 0.1 diode  \nscancn eta 0.02 51 w 0.1 diode  \nHKL Scans  \nOnce an orientation matrix is available, reciprocal space directions can be scanned:  \nscan hkl [0 3 0] [0 4 0] [0 0.1 0] pil3 1 roi2  \nscancn hkl [0 0.1 0] 21 pil3 1  \nscancn l 0.01 101 t 1  \nEnergy Scans  \nEnergy dependent scans need a little more care. For example, maintaining a fixed Q over an energy scan requires that the theta 2-theta positions be recalculated of each energy. Also if the phase plate or PA (polarization analyser) are being used their energy dependence must be compensated for in the scan. E.g.:  \nscan energy 7.0 7.3 0.1 hkl [0 3 0] pol 90 t 1  \nIn the above energy scan, hkl is maintained at [0 3 0] and the PA is adjusted to maintain the 90 deg polarization channel.  \n2D Mapping Scans  \nScans be be made of two scannables in a map:  \nscan sx -0.5 0.5 0.05 sy -0.5 0.5 0.05 pil 1 roi1 roi2 This scans repeats an sy scan at every sx position.  \nAdding metadata  \nAdd temporary devices to the data file headers (metadata): 'addmeta'. Command takes either a single PD/scannable or a list of PD's.  \nscancn eta 0.1 31 pil 1 roi1 roi2 Ta Tb  \nThe above is a centred scan of eta with","cbCairMZDdMVubN5","https://ap.wps.com/l/cbCairMZDdMVubN5","pdf",1069509,3,1,12,"English","en",105,"# Introduction\n## Beamline overview and components\n# Controlling your experiment\n## GDA vs EPICS and workstation setup\n## Data acquisition and scripting\n# Where data is stored\n## Experiment directory structure\n## Remote access and archiving\n# Basic commands\n# Scan commands\n## Centred and absolute scans\n## HKL scans\n## Energy scans\n## 2D mapping scans\n## Adding metadata\n## Checkbeam\n# Detectors\n## Detector offsets and rotation-stage selection\n## Common detector commands and notes\n# Introduction to the Kappa Diffractometer\n## Geometry and sample orientation","[{\"question\":\"What scan command types are supported in GDA?\",\"answer\":\"GDA supports centred and absolute scans. Both move devices to positions and perform an action at each scan point, with scan data stored in the experiment directory.\"}]","I16 User Guide - Hard X-ray Beamline Experiment Control | PDF",1787221490,30,{"code":4,"msg":32,"data":33},"ok",{"site_id":25,"language":24,"slug":34,"title":13,"keywords":35,"description":14,"schema_data":36,"social_meta":79,"head_meta":81,"extra_data":83,"updated_unix":29},"i16-user-guide-hard-x-ray-beamline-experiment-control","",{"@graph":37,"@context":78},[38,54,69],{"@type":39,"itemListElement":40},"BreadcrumbList",[41,45,49,51],{"item":42,"name":43,"@type":44,"position":21},"https://docshare.wps.com","Home","ListItem",{"item":46,"name":47,"@type":44,"position":48},"https://docshare.wps.com/document/","Document",2,{"item":50,"name":12,"@type":44,"position":20},"https://docshare.wps.com/document/technology/",{"item":52,"name":13,"@type":44,"position":53},"https://docshare.wps.com/document/i16-user-guide-hard-x-ray-beamline-experiment-control/133536/",4,{"url":52,"name":13,"@type":55,"author":56,"headline":13,"publisher":58,"fileFormat":61,"inLanguage":24,"description":14,"dateModified":62,"datePublished":63,"encodingFormat":61,"isAccessibleForFree":64,"interactionStatistic":65},"DigitalDocument",{"name":9,"@type":57},"Person",{"url":42,"name":59,"@type":60},"DocShare","Organization","application/pdf","2026-08-24","2026-08-20",true,{"@type":66,"interactionType":67,"userInteractionCount":20},"InteractionCounter",{"@type":68},"ViewAction",{"@type":70,"mainEntity":71},"FAQPage",[72],{"name":73,"@type":74,"acceptedAnswer":75},"What scan command types are supported in GDA?","Question",{"text":76,"@type":77},"GDA supports centred and absolute scans. 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