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Insertion Device Controls at the Advanced Photon Source. Mohan Ramanathan June 18, 2003. 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 - PowerPoint PPT Presentation
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A U.S. Department of EnergyOffice of Science LaboratoryOperated by The University of Chicago
Argonne National Laboratory
Office of ScienceU.S. Department of Energy
Insertion Device Controls at the Advanced Photon Source
Mohan RamanathanJune 18, 2003
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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
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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
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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
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STI Insertion Device
ID wiring interface boxes
Magnetic array
Gearbox
2 stepper motors run each end of this device
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STI Insertion Device
Stepper Motor
Gearbox
Chain tension adjustment
Upper jaw drive chain
Lower jaw drive chain
E-Stop
Rotary encoder
Linear encoder
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NGSM Insertion Device
Magnetic array
Gearbox
Rotary encoder & Motor assembly
4 stepper motors control each end of each jaw
Linear encoder
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NGSM Insertion Device
ID jaw drive screwMinimum gap hardstop
Gurley linear encoder
Gurley rotary encoder
Stepper motor
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Insertion Device with Vacuum Chamber
Minimum limit switch:
Stops this end from closing
Minimum limit switch:
Shuts off AC stepper motor drive power
Magnetic Jaws
ID Vacuum Chamber
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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
STI Typical 210mmNGS Typical 185 mm
~10.1 - ~10.25 mm
NGS Typical 185 mmSTI Typical 205 mm
Normal GapOperating Range
Maximum Software Limit
Beamline Software Limit
Maximum Gap Hardstop
Maximum Gap Limit Switch (logic input)
Vacuum Chamber
Minimum Gap Limit Switch (logic input)
Minimum Gap Limit Switch (relay chain)
Minimum Gap Hardstop
Minimum Software Limit
180 mm
11 mm
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ID Control System Overview
Controls Network
VME CRATE
OPI OPI
IDCONTROL
MVME167 OMS VME8VAROC
SSI
GURLEYENCODER
INTERFACE
FEEPS
MOTORDRIVES
INSERTIONDEVICE
RS232SERIAL
TOBEAMLINE
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ID Control System Layout
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ID Control Interface Logic
VME ID Interface Board Layout
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ID Control Interface
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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
Inhibited motion
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ID Controls Software Logic - MainModular – 4 Main parts
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ID Controls Software Logic – Global Actions
At Beam Loss..
OpenDevice
Mode ofOperation
Save CurrentGap / Taper
Position
MachinePhysicsMode
Open Device toPreset Value
UserMode
Save Desired Gap/ Taper Position,
and CurrentAccess Mode
Change toOperator Mode
Set Open Flag
After Injection..
CloseDevice
Mode ofOperation
MachinePhysicsMode
UserMode
RestoreSaved Gaps
MoveDevice
Set the CloseFlag
Reset Encoders& Log Encoder
data
Encoder ResetFlag
TRUE
Restore SavedMode and Gap
FALSE
Reset Openand Close
Flags
DeviceStopped
YES
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ID Controls Software Logic – Auto Open
To reduce Front End Heat Loads
IDAutoClose
FE Shutters Openand
Open Flag Set
YES
Reset Open Flagand
Restore GapPosition
When Shutters OpenID
AutoOpen
FE Shutters Closeand
User mode
Gap < 25mm
YES
Timer = 0Open gap to
60mm
Check every 120seconds
Gap = 60mm
NO
Start TimerCountdown
7200 seconds
Only When AutoClose Database
Loaded
Set Auto OpenFlag & AutoSave Gap
YES
YES
YES
When Shutters Close
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ID Controls GUI for System Managers2 Motor Device
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ID Controls GUI for System Managers4 Motor Device
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ID Controls – Software Debug GUIID control consists of about 350 records
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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
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WEB Access to ID Logs
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WEB Access to ID Logs
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General Control System Information
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Real-time Accelerator Data Distribution
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High Precision X-ray Timing Distribution
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Acknowledgments
Many thanks to my associates Marty Smith John Grimmer Mike Merritt