Insertion Device Controls at the Advanced Photon Source

1. Insertion Device Controls at the Advanced Photon Source Mohan Ramanathan June 18, 2003

2. Types of Insertion Device • Undulator - STI Device: • A 2-stepper motor device with the top and the bottom jaws coupled together by chains and gears; built by STI Optronics • Operated at gaps 11 mm ~ 35 mm • Undulator - NGSM Device (New Gap Separation Mechanism): • A 4-stepper motor device with each motor controlling each end of the top and bottom jaws. • Operated at gaps 11 mm ~ 35 mm • EMW Device (Elliptical Multipole Wiggler): • A 2-stepper motor device with the top and the bottom jaws controlled separately. • Permanent magnets in the vertical plane and electromagnets in the horizontal plane • Normally operated at a 24mm gap • CPU Device (Circularly Polarized Undulator): • A fixed gap device with only electromagnets

3. Insertion Devices Status • Currently 20 2-motor (STI) devices, 9 4-motor (NGSM) devices, 1 CPU device, and 1 EMW device • Total of 31 insertion devices located in 27 sectors around the storage ring • The rest of this talk will discuss the 2 motor and the 4 motor insertion device control system

4. Mode of Operation • The device is issued a command to move to a certain gap/energy • Both ends of both jaws are moved simultaneously • For taper, one end is kept at a different gap than the other end • The taper angle is limited to 2 mrad, which translates to about 5 mm difference in gap between the two ends ( 2.4 m long devices) • At beam loss: • Devices are switched to Operator access • Devices are fully opened • After Injection to more than 2 ma: • The devices are commanded to move to their previous user gaps which were saved prior to beam loss  • Device is switched back to User access • Beamlines request Floor Coordinator to set a beamline limit on the minimum gap of the device • Used by the beamline staff for additional equipment protection

5. ID wiring interface boxes Gearbox Magnetic array STI Insertion Device 2 stepper motors run each end of this device

6. Rotary encoder Linear encoder Upper jaw drive chain E-Stop Chain tension adjustment Gearbox Stepper Motor Lower jaw drive chain STI Insertion Device

7. Gearbox Linear encoder Rotary encoder & Motor assembly Magnetic array NGSM Insertion Device 4 stepper motors control each end of each jaw

8. Minimum gap hardstop ID jaw drive screw Gurley linear encoder Gurley rotary encoder Stepper motor NGSM Insertion Device

9. Minimum limit switch: Stops this end from closing Minimum limit switch: Shuts off AC stepper motor drive power Magnetic Jaws ID Vacuum Chamber Insertion Device with Vacuum Chamber

10. STI Typical 210mm NGS Typical 185 mm Maximum Gap STI Typical 205 mm Hardstop NGS Typical 185 mm Maximum Gap Limit 180 mm Switch (logic input) Maximum Software Limit Normal Gap Operating Range Beamline Software Limit 11 mm Minimum Software Limit Minimum Gap Limit Switch (logic input) Minimum Gap Limit Switch (relay chain) Minimum Gap Hardstop Vacuum Chamber ID Safeguards & Operating Ranges • Typical operating ranges: • STI Device 11 – 180mm • NGSM Device 11 – 180mm • The nominal ID gap is set at specified magnet poles. This means that due to magnetic tuning there may be spots along the structure that are higher by 100µm. So, in some cases the total clearance between the magnetic array and the vacuum chamber may be as tight as 25µm (0.001”) to either side of the chamber. 11 mm 10.8 mm 10.6 mm 10.4 mm – 10.5 mm ~10.1 - ~10.25 mm

11. ID Control System Overview

12. ID Control System Layout

13. ID Control Interface Logic VME ID Interface Board Layout

14. ID Control Interface

15. Inhibited motion ID Control System Limit Switch Interlocks • Logic • A minimum limit hit at one end stops that end from closing any further while inhibiting opening of the opposite end of the ID • A maximum limit hit at one end stops that end from opening any further while inhibiting closing of the opposite end of the ID • Prevents ID from crushing the vacuum chamber • Hard wired limit switches remove AC input power from the stepper motor drives

16. ID Controls Software Logic - Main Modular – 4 Main parts

17. ID Controls Software Logic – Global Actions After Injection.. At Beam Loss..

18. ID Controls Software Logic – Auto Open To reduce Front End Heat Loads When Shutters Close When Shutters Open

19. ID Controls GUI for System Managers 2 Motor Device

20. ID Controls GUI for System Managers 4 Motor Device

21. ID Controls – Software Debug GUI ID control consists of about 350 records

22. ID Controls – GUI for Users • Control of the device is accomplished with 10 process variable • Additional 5 process variables are used for synchronous Scanning mode. • Only 8 relevant process variables need to be monitored at any time • Additional monitoring of 10 process variables  may be useful • If needed, device can be controlled via a serial line

23. WEB Access to ID Logs

24. WEB Access to ID Logs

25. General Control System Information

26. Real-time Accelerator Data Distribution

27. High Precision X-ray Timing Distribution

28. Acknowledgments • Many thanks to my associates • Marty Smith • John Grimmer • Mike Merritt