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Lab #1 CA Clients

Lab #1 CA Clients. Lab #1 EPICS CA Clients.

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Lab #1 CA Clients

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  1. Lab #1CA Clients

  2. Lab #1EPICS CA Clients • Real Life Example #1 : After assembling the ioc and configuring the EPICS database, the application developer left on vacation right before your scheduled commissioning shift. Using a variety of tools (Channel Access Clients), you will interact with the new LINAC and try to achieve your commissioning milestones. • Your goals for the shift are to : • Transport beam to the end of the LINAC • Optimize beam transport • Measure the beam energy using a bending magnet and faraday cup • Stabilize beam current with simple closed-loop control • Full documentation on the Knob Manger, BURT, and ALH can be found at : http://csg.lbl.gov/EPICS/RecommendedDocs.html

  3. “Virtual” LINACTheory of Operation • Beam is generated from the electron gun when the cathode temperature (studnt_:cathodeTempM) is > 130 degrees and the gun is enabled (studnt_:gunOnC = 1). The cathode is heated by adjusting its current (studnt_:cathodeCurrentC) • Beam is steered down the linac using 5 sets of correctors. Each set consists of a horizontal corrector (studnt_:Hn:setCurrentC) and a vertical corrector (studnt_:Vn:setCurrentC) [n=1-5] • The gate valve must be opened to get beam past PM2 (studnt_:GV1:positionC = 1) • Diagnostics: • one current monitor (studnt_:CM1:intensityM), • five BPMs (studnt_:PMn:X:positionM, studnt_:PMn:Y:positionM, studnt_:PMn:intensityM) • two faraday cups (studnt_:FCn:intensityM)

  4. Tasks • Complete an medm display to interact with the virtual linac • Write a shell script to calculate a useful parameter (transport efficiency) • Use the Knob Manager to provide convenient control of power supplies to maximize transport • Configure a StripTool to trend important parameters • Use burtrb/burtwb to save/restore settings • Configure the Alarm Handler to monitor critical parameters • Use some APS OAG tools to find optimum settings and implement closed loop control • Write a script to automate linac startup/shutdown • Experiment with other clients (cau, wingz, etc) HINT : If you need assistance, ~studnt0 has already completed the lab exercises

  5. MEDM • Develop an medm display that allows interactive control of the power supplies, electron gun, and gate valve (begin with ‘~/host/medm/linac.adl’) • Suggestions : • Add ‘sliders’ for control of corrector power supplies • Add ‘text entries’ for control of cathode heater and bending magnet supply • Add ‘Choice Buttons ‘ for studnt_:gunOnC and studnt_:GV1:positionC • Transport beam down your linac • Increase the cathode current until Cathode Temperature exceeds 120 degrees. • Turn on beam using studnt_:gunOnC • Steer beam down linac using corrector supplies • Open Gate Valve • Optimize steering to end of linac

  6. MEDM(cont.) • More features … • Make a warning message appear on the display whenever the “Beam On” button is depressed (studnt_:gunOnC != 0). Use a text widget with ‘Visibility’ set appropriately. • Create a new display that has a strip chart to trend the cathode temperature. Place a related display menu on the main display to call up the strip chart display. Try using the invisible attribute to make a hot button on the image of the gun that brings up the strip chart display.

  7. Unix shell commands • Experiment with the shell tools provided in the EPICS distribution (type the command without any arguments for a usage line) : • caget • caput • cavget • cavput • caGet • caPut • cawait • caInfo • Write a simple shell script (csh, perl, etc.) to calculate transport efficiency (FC1/CM1). Write this calculated value (caput) to a spare PV in the ioc (studnt_:opVariable1). Add a text monitor on your medm screen to display this value. • Help files for c-shell and perl are located in ~/host/scripts.

  8. Knob Manager(km) • Start the knob manager client (km &) • Drag and drop PV names of corrector supplies into knob manager knobs • Use knobs to optimize steering down the LINAC • Investigate Knob Manager capabilities • Knob Disable • Memory • Up/Down Arrows • Save the knob manager configuration in the ~/host/km directory • Add a shell command menu to the medm display to call up a pre-configured knob manager • e.g. km -filename <configFile> &

  9. StripTool • Start the StripTool (StripTool &) and create a configuration that trends the cathode temperature, cathode current, FC1 current, and transport efficiency (updated by previous shell script) • Attempt to achieve maximum transport efficiency of beam by steering while monitoring the strip chart. • Save the StripTool configuration in ~/host/stripTool/ • Add a shell command menu on the medm display to call start a pre-configured StripTool. • StripTool <config_file> & • Investigate other features of StripTool • Drag other PVs directly to plotting area • Zoom In/Out • Right mouse button on plotting area menu

  10. Backup/Restore(burt) • burtrb : saves the value of a list of PVs that are listed in a “request file” (filename1.req) to a snapshot file (filename2.snap). • Type burtrb for a usage line • Save settings : burtrb -f linac.req -o settings1.snap • Request file syntax • One PV name per line • If PV is preceded with RO (Read Only), the PV is stored in the snapshot file by burtrb but not restored by burtwb. • Examine linac.req and settings1.snap • burtwb : restores the value of PVs as saved in the “snapshot” file • Type burtwb for a usage line • Restore settings : burtwb -f settings1.snap • Add a shell command menu on the medm display to save and restore power supply settings from the medm display. Provide two commands that store in different files and two restore commands.

  11. Alarm Handler (alh) • Start the alarm handler (alh &) and open the configuration file ~/host/alh/linac.alhConfig. • Create alarm situations and interact with the alarm handler • Investigate other alh capabilities • Add “alias” names for the PVs ($ALIAS) • Add the capability to bring up the strip chart medm display from the alarm handler when the Cathode Temperature PV alarms ($COMMAND) • Add simple HELP text for the operator for the Gate Valve PV ($GUIDANCE ) • Configure the alarm handler to ignore the cathode temperature alarm if studnt_:gunBakeoutC = 1 ($FORCEPV) • Add a $GUIDANCE command for the top group to bring up your favorite web page • Add a ‘shell command’ menu on the medm display to call up this pre-configured alh (e.g. alh/ linac.alhConfig).

  12. Miscellaneous OAG Tools • Use quickExperiment to find the optimum BM1 current to bend the beam to FC2 • Obtain as much beam current as possible at FC1 • cd to ~/host/sdds. Start quickExperiment (a TCL/TK application) and configure : • Measurement PV - studnt_:FC2:intensityM (use ‘NAME CAPTURE …’ to drag/drop) • Variables PV - studnt_:BM1:setCurrentC • Steps : 50; Initial : 200; Final : 225 • Output File - ./bm1Scan • Press ‘Run’. Wait for it to complete the ramping cycle • Press ‘Plot ./bm1Scan’ • Select Mouse Tracker from the Options menu and determine optimum current for bending magnet. • For more info on quickExperiment , use the context sensitive Help

  13. Miscellaneous OAG Tools • Use maintainReadback to stabilize cathode beam current (observe result using the StripTool). • Obtain as much beam current as possible at FC1 • Start the StripTool to trend cathode temperature and FC1 current (use the previously developed configuration file). Note the oscillation in cathode temeperature. • cd to ~/host/sdds. Start maintainReadback (a TCL/TK application) and configure : • Readback : studnt_:cathodeTempM • Actuator : studnt_:cathodeCurrentC • Hold : 157 ; Change limit : 1 ; Gain : .2 ; Action limit : 0 ; Pause : 1 ; Steps : 100 ; Samples : 1 ; Mode : Integral • Press ‘Run’ • Monitor the strip chart to see effect • For more info on maintainReadback, use the context sensitive Help

  14. Automate Routine Sequences • Write a ‘LINAC ON’ shell script to perform the following: • Launch medm with the appropriate display • Heat up gun cathode to optimum temperature (studnt_:cathodeTempM.SEVR = 0) • Restore optimum settings for best transport (use burwb and a previously saved snapshot file) • Launch alarm handler to monitor LINAC • Turn on the gun • Open gate valve • Write a ‘LINAC Off’ shell script to perform the following: • Turn off gun, lower cathode heater current • Close gate valve • Turn off all power supplies (set current to 0)

  15. Additional Clients • Probe • Start probe : probe & • Drag/drop a PV from the medm display • Investigate probe features • wingz - Spreadsheet • cd to ~/hosts/wingz • Start wingz : wingz caWingz.wkz & • Replace $(user): with studnt_: • Select a cell to the right of a PV name. Hit caGet to retrieve, caPut to send • Select multiple cells to perform backup and restore functions • cau - Channel Access Utility • Start cau : cau • type ? for a list of commands • “monitor” several PVs from the LINAC

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