1. Undulator System Overview
DOE Review of the LCLS Project
May 10 – 12, 2005
Stephen Milton
Argonne National Laboratory
Advanced Photon Source

2. Technical Overview of Scope

3. Overview of Scope: Undulator System
40 total
33 installed
3 operational substitutes on mover/support system ready for swapping
3 undulators and mover support system parts at the ready for installation
1 reference
Quadrupoles
34 installed with the installed undulators (38 total)
Electromagnetic in design
This was a change from permanent magnet quadrupole since the last DOE review
Integrated horizontal and vertical corrector magnets in quadrupoles
Support system
33 separate supports for the undulator system
Change since the last DOE review from 3 support/mover systems with 3 undulators on 1 long granite base
New supports possibly extruded aluminum with temperature stabilization using water
Support/mover still retains the functionality for
5 degrees of freedom remote, accurate positioning for beam-based alignment
Independent remote undulator horizontal positioning for K-tuning and “removal”
Check with Marion about the total number of quadrupoles being assembled
Check with Sushil about the girder/raft construction method. Al extrusion? Get a picture if possible. Find out the conclusion from the meeting a couple of weeks ago.

4. Overview of Scope: Undulator System
Vacuum System
Al on Stainless Steel with a rectangular cross-section for the main chamber in the undulators
This was a change from the last DOE review which at that time was Cu with a circular cross-section
The chamber is still independent of the undulator to allow for undulator “rollaway” option
Between Undulators
Circular cross-section (abrupt transition)
22 Short break sections
Contains: Quadrupole, BPM, bellows, pump, radiation detector, wire-style beam locator
11 Long break sections
Contains room for additional diagnostics: OTR screens, prototype x-ray monitor
Don’t forget to highlight the use of the K-tuning to “normalize all breaks

5. Overview of Scope: Undulator System
Primary Diagnostics
Beam Position Monitor (BPM)
X-band cavity-type BPMs
Relies heavily on the accomplishments of the prototype used for linear collider tests
SLAC and ANL collaborating with P.Krejcik (SLAC) leading the effort (See his talk in the breakout session)
Optical Transition Radiation (OTR) Screens
1 every third undulator
5 micron resolution for observing the beam distribution
Wire Scanners
Practical use being revisited
Might switch to beam locator wires at the upstream end of each undulator
Beam Loss Monitors
1 set every undulator
Used to protect the undulator from excessive radiation exposure
Will probably copy closely what TTF has done
Hydrostatic Leveling System
1 micron accuracy
To provide vertical positioning information for quadrupoles and undulator
Wire Position Monitor
To provided horizontal and positioning information for quadrupoles and undulators

6. Overview of Scope: Undulator System
Controls
Bob Dalesio (SLAC) directs the overall LCLS Controls effort; therefore,
Josh Stein (ANL) will work directly with Bob to ensure a robust integration of the Undulator System controls into the overall LCLS controls system
Major Undulator Systems Controls Efforts
Precision Mover Motors (ANL)
Beam Position Monitors (SLAC/ANL)
High-Speed Video System (ANL)
Wire Scanner system (ANL)
Beam loss monitor system (ANL)
Magnet power supplies (SLAC/ANL)
Vacuum system (SLAC/ANL)
HLS and WPM systems (SLAC)

7. Overview of Scope: Undulator System
Magnet Measurement Facility
SLAC responsibility
ANL acting in mentor/consulting role
Major Pieces of Equipment
Precise temperature controlled building
+/- 0.1 deg. C in measurement area
7m undulator test bench
4.5m undulator test bench
Old bench borrowed from ANL
2 CAM mover systems for undulators
1 (or 2) Capacitive sensor systems for undulator mechanical alignment
1 (or 2) Coil (wire) systems for field integral measurements
Hall probe calibration system
"Pointed magnet" calibration system (for undulator fiducialization)
Quadrupole fiducialization system
Quadrupole strength and harmonics measurement system
Coordinate measurement machine

8. Undulator System Overview

9. LCLS Magnet Measurements Facility
Construction Schedule
Construction to start soon
Beneficial Occupancy Early Calendar Year 2006
Provided by R. Ruland

10. Major Accomplishment, Progress, Decisions

11. Accomplishments, Progress, Decisions
Management
New People
Geoff Pile (ANL), ANL LCLS Chief Engineer
Brad Youngman (SLAC), Undulator Integration Engineer
Sushil Shama (ANL), ANL Mechanical Engineer, Fixed Supports
Horst Friedsam (ANL), ANL/SLAC Survey and Alignment Liaison
Joe Ingraffia (ANL), ANL Procurement
Tom Barsz (ANL), ANL Quality Assurance

12. Accomplishments, Progress, Decisions
Magnets and Supports
Undulator Long-Lead Procurements
2 awarded
Strongback
Magnet Poles
Last one in the remaining stages of the procurement process
Undulator motion/support system test bed constructed and under test
Quadrupoles
Decision to go to electromagnets with integral correctors
Engineering design well progressing well
Supports
Assigned an experienced mechanical engineer to the fixed support system
Plan to move away from granite holding 3 undulators to a short, compact, robust support system

13. Accomplishments, Progress, Decisions
Vacuum System
AC Conductivity Issue
Calculations show that the field from the wall currents induced by the electron beam in the walls of the originally planned copper chamber would conspire to degrade the FEL performance
Calculations also showed that aluminum would perform better than copper and that a flat cross-section would also reduce the AC conductivity term
Tests were performed to validate these calculations
We have switched to an aluminum coated stainless steel chamber
This has set us back in our schedule, but the chamber is still not on the critical path
New chamber design
Progressing well
Initial short test samples constructed
Checking, among other thing, relative permeability after bending, welding, and annealing
Transitions and Wakefields
Tapers will not help unless extremely long
Bunch length is too short
We plan to use abrupt transitions an minimize the number of these
Calculations show this to be OK

14. Accomplishments, Progress, Decisions
Primary Diagnostics
RF BPMs
A SLAC/ANL working group has been organized
Have chosen X-band over C-band
Planning on prototype tests of a complete system within a year
OTR Screens
Design complete
Prototype under construction
Wire monitor
Design near complete
Need to finalize wire card
We are presently reconsidering our use of this
Other diagnostics
Plan shows work to start on these soon

15. Accomplishments, Progress, Decisions
Controls (ANL Component)
Cable layout and room data requirements have been transmitted to SLAC
Video System
Full frame data acquisition and control of the cameras has been demonstrated to 15 Hz
Demonstration of higher rates is planned in the near future
Precision Motion Controls System for the Undulator
Control has been demonstrated, but not yet interfaced to EPICS

16. Accomplishments, Progress, Decisions
Magnet Measurement Facility
Construction of the MMF to begin soon
The procurement process has begun for some of the key items
The CMM
RFP Issued
The 7.5-m bench
Evaluating RFP responses
See R. Ruland’s talk for more details

17. Accomplishments, Progress, Decisions
Requirements/Desires
Keep heat sources out of the tunnel
Keep cable lengths to less than 150’
Provide for convenient service and maintenance for all electronics
Equipment Halls
Additional Hole for future extension if needed
Maximum Cable Length < 150’
6 Undulators served
per drill hole

18. Undulator System Project Information

19. Costs and Cost Breakdown
$48.6 M TEC

20. Costs and Cost Breakdown

21. Summary Schedule

22. Summary Milestones

23. Long-Lead Procurements

24. Undulator LLP: Ti Strongback
Status
Two Vendors Chosen
Awards Made
Based on cost to pre qualified vendors
Cost higher than expected due to very rapid increase in cost of metal commodities over the last couple of years
Planned cost: $2.1M
Awarded cost: $3.2M
Need planned and awarded costs from Marion

25. Undulator LLP: Magnet Poles
Status
One Vendor Chosen
Based on cost from pre qualified vendors
This vendor also had experience
Cost came is less than what we originally estimated
Due to simplification of the pole design
No ears
Planned Cost: $1.4M
Awarded Cost: $0.9M

26. Undulator LLP: Magnet Blocks
Status
Proposals have been received
Negotiations are in progress
Award to be made soon

27. Undulator LLP: Magnet Measurement Facility
Status
Construction to begin soon
Large purchases in various stages of progress
See R. Ruland’s talk for more information

28. Responses to Recommendations

29. Response to Recommendations
Expedite acquisition of article 1. This will allow for early contact with assembly vendors, the opportunity to incorporate corrections in assembly based upon magnetic measurements, and early commissioning of the magnetic measurement facility at SLAC. This should occur early in FY05 to allow delivery by end of FY05.
Agreed. As stated during the review, by going forward with the acquisition of the 1st article undulator during FY05 we can significantly reduce the risk to the delivery of the undulator. Through the use of a BCR the LCLS Undulator team has incorporated this revised plan into the project schedule.

30. Response to Recommendations
Expedite system integration design/plan of a full module over the next year. The system integration plan currently assumes that the undulator design is essentially frozen. Other components must accommodate fit around it. The vacuum chamber is the most significant component affecting system integration. A complete module should be assembled before procurement of the vacuum system is initiated. This needs to occur within FY05 to accommodate the planned FY06 production.
Agreed. A plan for testing prototype undulator systems has been integrated into this WBS. Due to the continuing resolution the dates for the initial single undulator integration test will occur in early FY06 and not FY05 as originally hope for.

31. Response to Recommendations
Finalize choice of quadrupole type. This needs to occur by the end of FY04, or very early in FY05, in order to accommodate required facilities changes.
Electromagnetic quadrupoles have been chosen as the baseline design for the undulator system. The exact performance specifications for the electromagnetic quads are defined and documented in the revised PRD “General Undulator System Requirements”.

32. Response to Recommendations
Incorporate stretched wire based field integral measurements for each article in magnetic measurement plan.
Following the recommendation of the committee, stretched-wire-like field integral measurement capability will be available in the magnet measurement facility.

33. Response to Recommendations
Make sure that experience in magnetic measurements of first articles is incorporated into necessary modifications of assembly procedures.
Agreed.

34. 6 Month Look Ahead BPM System OTR Wire Scanner Support/Mover System
Build cold test prototype x-band beam detector
Design receiver boards
OTR
Assemble and Test Prototype
Wire Scanner
Support/Mover System
1st Article Undulators
Maybe receive 1st articles from assembly vendors
Fixed Supports
Finalize design and begin procurement for testing
Vacuum Chamber
Finalize testing of construction methods
Start building prototype
MMF
Construction over ½ complete

35. Summary Management Undulator Diagnostics Vacuum System Controls
Ramp up of people nearly complete
Good clear interface between SLAC and ANL established at all critical points
Undulator
LLP for undulator nearly complete
Now waiting for start of deliveries
Support mover system design work progressing as planned
Diagnostics
Critical diagnostics work progressing well
Vacuum System
Switched from copper to aluminum on stainless steel due to AC conductivity issues
Caused some delay to this system but not to the project
Controls
Interface (roles and responsibilities) between SLAC and ANL understood
Work progressing well on the video and mover systems
Magnet Measurement Facility
Construction to start soon