Insertion Device Controls at the Advanced Photon Source

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