Wire Position System LCLS Undulator Alignment and Motion Review, Oct. 22, 2005 1 [email protected] Franz Peters Wire Position System The Undulator

Wire Position System

LCLS Undulator Alignment and LCLS Undulator Alignment and Motion Review , Oct. 22, 2005Motion Review , Oct. 22, 2005

[email protected]@SLAC.Stanford.edu

Franz PetersFranz Peters


The Undulator

• Description Task, Design Objectives & Building Blocks

• Integration Mechanical LayoutElectronics & Local Control

• Experience Previous Setups &Performance Measurements





Task of wire position system….

X-Ray runs: Permanent X & Y Position tracking of the 33 Undulator Segments on a Sub-Micrometer scale.

Description

1 33

A BReference Reference

Diameter of a human hair

No one has tried that in before.

In any case we are the first: The first with success or

The first with no success





Design objectives… to be successful

• Resolution < 100 Nanometer in X & Y direction• Instrument Drift < 100 Nanometer per day

• Moving Range + - 1.5 Millimeter in X & Y direction

• Accuracy 0.1 % of full Scale

• Availability Permanent, no interrupts

Description





Principle options, detecting a wire..

• Capacitive The measurement of small charges

limits Resolution and increases Drifts

• Inductive Electrical noise and mechanical dimension limits resolution and stability.

• Matched Balanced use of both, electric & magnetic field which meets design objectives mostly.

• Optical Microscope, no Drifts, but Resolution limited by visible wave

length.

Description





Matched.., works like an RF directional coupler

Description

The principle is really simple, but we are shooting for resolution and stability in the region of 10 to the - 5





Figure 2 Principle scheme of the stretched wire position system.

Position monitor and nearby tubes are free moveable relative to the stretched wire.

Tube bellows Pulley wire terminal

Weight

Fixed wire terminal

1. Fixed side wire end station2. Tube, as outer conductor3. Position Monitor for X & Y direction4. Pulley side end station5. Weight, used as constant force6. The wire: 0.5 mm diameter,

stainless steel, Au plated

Mechanics

Description

1 2 3 4

5





Monitor GAP 8 Millimeter squareMonitor Length 74 MillimeterCross Section 29 Millimeter square

The Monitor 8 mm

Loops Wire

Description





Electronic & Local Control

Substations

Receiver Crates

Quad-ADCs

Local Control

Ethernet LAN

Data Base

Local Consol

Local Ethernet Segment, TCP / IP Protocol

WPS Local Consol

WPS Data Base

WPS WEB Server

LCLS ControlSystem

LAN HUB

Data Acquisition, Data Analysis Data Base

Local computer

Receiver crates

1

2

WPS Sub-station A


Local computer

Receiver crates

3

4


Local computer

Receiver crates

1

2

WPS Sub-station B


Local computer

Receiver crates

3

4

Description

Link to LCLS Controls via

TCP / IP





610 mm

240

280

Wire1

Wire2

Position Monitor

Geometry, - or were are the best places for two wires? -

Integration

One wire interfer with segment installationOne wire interfer with segment installationSupports necessary on both girder sidesSupports necessary on both girder sidesRoll data are depend on wire sag stabilityRoll data are depend on wire sag stability

No interferece with segment installationNo interferece with segment installationOne common support for both wiresOne common support for both wiresRoll data are independend from wire sag stabilityRoll data are independend from wire sag stability

610 mm

240

280

Wire1

Wire2

Position Monitor

HorizontalHorizontal VerticalVertical





610 mm

240

280 10

0

Wire1

Wire2

Position Monitor

Monitor Support

Integration

Two monitors on each end of each girder

Segment removable without interfering WPS

X-Pos and Y-Pos, can be measured Roll, Jaw & Pitch can be calculated.





Geometry

Wire end station Wire end station

136 Meter

1 33

Undulator segmentWire

Undulator hall

Wire Position Monitors

Wire Position Monitors

Integration





Integration

Electronic distribution…Options

1 8 16Undulator segments

4 8

16Monitors / 19“ Crate

19“ Crate Packages

Fault tolerant structure

Power 5V,+ - 15V

4 Receiver

MPX Controller

Legend:





Result: WPS should never call for a controlled access.

With 4 Crate in one place we have some redundancy. Failures at any system level does not affect functionality or performance. Why ?

Loss of

Ypos

Xpos

pitch

jaw

1 2

1 2

43

1& 2

3 &4

PC

PC

ADC

ADC

Wire 1

Wire 23 4

roll

Fault-tolerant structure ?

One of 4 Monitors has no effectOne of 4 Crates has no effectOne of 4 ADCs has no effectOne of 2 Computers loss of roll only

Integration

But, Roll is available also by HLS





136 Meter

1 338 16 25

A

Undulator SegmentWire end station Substation

B

Undulator hall

Legend:

Proposed substation places.. A & B

In case of failure…. …no controlled access to the Undulator hall necessary,

because of a fully redundant system structure.

Integration





Substation LayoutReceiver ReceiverCable Panel

.60

m

PowerPower Power

Rec

eive

rR

ecei

ver

Rec

eive

rR

ecei

ver.7

0 m

Cable Cable

Cable Cable

Control

Man

ifold

Man

ifold

Loca

lC

ontr

ol

Radiator

Loca

lC

ontr

ol

Cable race way

No additional heat load to the Undulator hall, because of one built in air condition unit with radiators outside.

Integration

Receiver Crate





3420 mm

470 mm 898 mm735 mm 735 mm

Electronic stationwith local cooling

1200 mm

600

mm

1950 mm

Front View

735 mm735 mm

1400

mm

1940 mm 2368 mm1950 mm

Wire position monitors

Quadrupole

Wire

Beam pipe strong back

One of two substation

One Substation fit between supports under one Undulator segment.

Integration





SLAC FFTB WPS at first designed for FFTB Quadrupole position

tracking. Runs a few weeks per year over several years.

SLAC Sec10 Performance test with 14 Monitors, 2 Wires, 30 Meter wire length at the SLAC alignment tunnel.

DESY HERA H1 & Zeus IP straight sections under control by WPS

128 Monitors, 4 Wires, 60 Meter Length, each.

Experience





30 m

Electronicrack

Air condition

1 2 3 4 5 6

Tunnel Access

Hut

Ground cover line

Tunnel side view

Tunnel top view

Front view

Two wire (a & b) test set up- seven wire position monitors, each -

Fixed point wire terminals

Pulley wire terminals

Figure 1 Wire system test set up - geometrical layout at the Sector10 alignment tunnel -

ab

7

1 m

Electronicrack

Air outlet

Performance Test – Sector 10

Experience

2 Wires 30 Meter Length, 14 Monitors





0:005/22/04

12:005/22/04

0:005/23/04

12:005/23/04

0:005/24/04

12:005/24/04

0:005/25/04

12:005/25/04

0:005/26/04

5 M

icro

met

er /

div

a-6

a-7

a-5

a-4

a-3

a-2

a-1

Figure 7 Four day strip chart record of horizontal wire positions at monitors a1 to a7.

73 696966

Four day strip chart of wire to wall motion at Sector 10

Motion of wire end at one side, indicates wall motion on that side

5 M

icro

mte

r /

div

isio

n

Date

Experience

Noon to Noon

Outsite average temperatures

66 69 69 73





Tunnel top view

1 2 3 4 5 6 7

12

3 4 5 67

Monitor #

End station 1

End station 2

Wall position+ 13 µm

Wire Position Reference at October 6th

Situation on October 25thWall position

- 8 µm

Figure 10 Tunnel wall deforming during the October run.

Wire

= Wire position readout at monitors

Wall deforming at Sector-10 alignment tunnel over time.

Analysis showsExperience





0:00 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00

0.5

Mic

rom

eter

/ di

v

0.5

°K

/ di

v

Airtemp

a-5

Figure11 Correlation of wire position with air temperature swings, generated by air condition duty cycles.

10/27/04

One Micrometer

Wire to wall motion correlates with air temperature cycle

Resolution Test…

0.7 Degree K

Performance

Air

Tem

per

atu

reW

ire

Mo

tio

n





0

2

4

6

8

10

1 75 149 223 297

Mic

rom

eter

0,0

0,1

0,2

0,3

0,4

0,5

Mic

rom

eter

Wire

Mon a-5

Mon a-1

Motion

19.8 meter 0.7

Figure 14 Correlation of wire positions at Monitor a-1 with a-5. -32 Hour zoom from Figure10-

Mon a-5

Mon a-1

10/19/7:00 24 hour corellation period 10/20/7:00

Endstation

Correlation of both curves indicates Drift << 100 Nm / day

100 Nanometer

Drift Test 24 hour Ratio (Mon5a / Mon1a) = 19.8 / 0.7 = constant

24 hour period

Performance

Mon5a

Mon1a

Mic

rom

ete

r

Mic

rom

ete

r





0

10

20

30

40

50

60

70

80

90

2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 1 2 3

Mic

rom

eter

a 7

a 6

a 5

a 4

a 3

a 2

a 1

Figure 14 Horizontal wall positions during December/January run. - Midnight snap shots -

10 Micrometer / div

Overall System Test - 32 Days of wall motion tracking -

10 20 30 Days

30 M

eter

wal

l

17

23

45

6

0

Wir

e

Access

LINAC

Performance





• Resolution << 100 Nanometer in X & Y direction

• Instrument Drift << 100 Nanometer per day

Summary

As experience has shown….

Coming up activities….

Final integration into Undulator needs further engineeringHard- & Software has to be improved for latest updatesSystem Test & Calibration Facility will be neseccary

Long distance wire needs further R & D





Finally, were we are?

0:00 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00

1

Mic

rom

eter

/ d

iv

b-7

b-6

b-5

b-4

b-3

b-2

b-1

a-7

a-6

a-5

a-4

a-3

a-2

a-1

Figure12 Horizontal movement of wire a & b at seven position monitors, each. Driven by air condition cycles

10/27/04

2 Wires, 14 Monitors – or 10 % of LCLS wire system is now working -

Up

pe

r W

ire

Lo

we

r W

ire

One Micrometer / division

Watching horizontal Sub-Micrometer wire motions, generated by Air Condition

Hours

1

7

1

7

End of presentation

Documents

Wire Position System LCLS Undulator Alignment and Motion Review, Oct. 22, 2005 1 [email protected] Franz Peters Wire Position System The Undulator