SLAC Aware IOC EPICS Magnet Functional Requirements

1. SLAC Aware IOCEPICS Magnet Functional Requirements • Introduction • Magnet Functions • Displays • Database • EPICS Channel Access Applications • Phase II

2. Introduction • Alpha, Unix and EPICS IOC • Dataflow • What will be supported • What won’t be supported • Later additions after Phase I

4. Supported Magnet Functions • Trim – Adjusting DAC to attempt to fit BACT to BDES • Perturb – Open loop setting of magnet to the desired B-field used for knobs and changes smaller than TOLS. The ADC is not read. • Calibrate – A calibration procedure measures magnet current as a function of DAC setting, and calculates a linear fit used by the other magnet control functions. • Standardize – Cycle ps between zero and max current several times, leaving ps at a predefined set point. This restores the magnet to a condition under which its magnet field as a function of current was measured. This allows the magnet to be set reliably to a new desired BDES. • Mini-Standardize – Maintain standardization when trimming or perturbing a magnet in a direction opposite to standardization. Move magnet 5% above desired set point and then move magnet in direction of standardization to desired set point. Device cannot be shunted or boosted.

5. Supported Magnet functions • Zero – Set magnet ps dac to zero. • Hardware Knobs – Assign a prim,micr,unit to a knob box and move a the device (perturb) • Software Knobs - Allows several magnets to be moved together as a group (perturb) • Touchup – Set (pertub) a ps when it is out of tolerance. • IACT to IDES – Set desired current to actual current • Calibrate Diagnostics - Calibrate function that allows setting of the number of steps and wait time. Additional diagnostic information is returned which the user can display. • Degauss – Cycle ps between min and max currents to remove residual field by This can be done for bipolar supplies only. • On/Off – Turn power supplies on or off • Reset Interlocks – Clear Interlocks

6. Unsupported Magnet Functions • Check function • Diagnostic knobs • Direct Module I/O (VME or CAMAC) • Control of SLC Magnets (in phase I)

7. Displays • Monitor only for magnets by sector • Monitor & Control for magnets by sector a w/ the exception of SLC controlled magnets. Will be listed but not controllable. • All units displays (xcor, ycor, quad, bend, solenoids) • Single Unit display • Status color coding same as SCP (green, yellow, magenta) • Z-Plot • B vs. I • History – data from Channel Archive and not History Buffers on SLC • Bad Units, Lost Standardize, Tripped Units, Bad RMS, Offline Units • Diagnostic Displays (decoding status bits in hsta/stat) • Diagnostic Calibrate • Many but not all standard displays

10. Database • Using SLC High Level Applications requires duplicate DB information in EPICS and SLC. This will be done for the Injector, Linac and BSY. In such cases the EPICS DB will be the considered the master. • Save/Restore will be done on EPICS DB. New values for supertype 2 & 3 pushed to SLC DB. • Phase I will provide not control of SLC controllable magnets from EPICS • Naming convention for EPICS DB <PRIM>:<MICR>:<UNIT>:<SECN> Example) QUAD:LM21:201:BDES • Naming convention for SLC DB <PRIM>.<MICR>.<UNIT> Example) QUAD.LM21.201

12. EPICS Channel Access Applications • Save/Restore • Restore values on boot • Gold and Configuration Files • Channel Archive • Channel Watcher • Alarm Handler • Strip Tool • EDM – EPICS Display Tool • CMLOG • Matlab

13. Phase II • Change BDES for SLC controlled Magnet • Modeling – XAL • KMOD to BDES • Steering • Correlation Plots • Diagnostics • Move SLC Controlled Magnets to VME