Title: LCLS Undulator Diagnostics and Comissioning Workshop John N. Galayda, Stanford Linear Accelerator Ce
1LCLS Undulator Diagnostics and Comissioning
Workshop John N. Galayda, Stanford Linear
Accelerator Center19 January 2004
- Challenges of Commissioning the FEL
- Alignment
- Undulator K
- Undulator Damage
- Undulator Diagnostics
- Commissioning
- Operation
- Charge
2The Worlds First Hard X-ray Laser
Introduction
3(No Transcript)
4Conventional Construction
- Transport
- Undulator
- Near Hall
- Tunnel
- Far Hall
- 3 Beams/mirror
- FEL Center Lab/Office
- Expansion
5Conventional Construction
- Transport
- Undulator
- Near Hall
- Tunnel
- Far Hall
- 3 Beams/mirror
- FEL Center Lab/Office
50m gt288m ?
What are cost implications of moving beam dump
and near hall backward, placing the Near Hall
ground floor underneath the FEL Center? What are
the cost implications of moving the Far Hall
further east? How do the dimensions of the Far
Hall affect cost?
6Estimated Cost, Schedule
Readiness
- 220M-260M Total Estimated Cost range
- 265M-315M Total Project Cost range
- Schedule
- FY2003 Authorization to begin engineering design
- Emphasis on injector and undulator
- FY2005 Long-lead purchases for injector,
undulator - FY2006 Construction begins
- January 2007 Injector tests begin
- October 2007 FEL tests begin
- September 2008 Construction complete
7Challenges for Diagnostics in the Undulator
Channel
- Tolerances on Trajectory are Tight for SASE at
1.5Å - Beam-based alignment, RFBPMs must deliver a good
trajectory - Tolerance on K of an undulator is around 1.5 x
10-4 - Equivalent to 50 micron vertical misplacement
- This displacement does little to the electron
optics - This displacement does little to the spontaneous
spectrum of 1 und. - Piezo end tuners provide adjustment equivalent to
K 4x10-4 - Radiation Damage to Undulators is a Concern
- Interlocks will be implemented but tolerable
losses are low - Can the diagnostics identify a damaged undulator?
8Charge Will the Undulator Diagnostics Serve
Commissioning and Operations Needs for the LCLS?
- Commissioning
- Can diagnostics be used to troubleshoot the new
hardware? - Can diagnostics be used to guide path to
saturation? - Operations
- Will the diagnostics permit simple and speedy
troubleshooting? - Reliability/Availability goals of the LCLS will
be those of a light source - Light diagnostics are crucial
- Can the diagnostics survive at high power?
- If not, are we placing too heavy a reliance on
data taken with low charge? - What are the alternatives?
- Variable gap?
- Rollaway undulators?
- Do we have redundant diagnostics capability where
appropriate? - Diagnostics that check the diagnostics
9Point of No Return
10End of Presentation
11Preliminary Schedule
CD-1
CD-2b
CD-3b
CD-0
Title I Design Complete
CD-2a
CD-3a
Critical Decision 0 Mission Need June 13,
2001 Critical Decision 1 Preliminary Baseline
Range October 16, 2002 Start Project
Engineering Design October 2002 Critical
Decision 2a Long-Lead Procurement Budget June
2003 Critical Decision 2b Performance
Baseline April 2004 Critical Decision 3a
Start Long-Lead Procurements August 2004 Fund
Long-Lead Procurements October 2004 Critical
Decision 3b Start Construction August
2005 Fund Construction October
2005 Construction Complete
End of FY2008
12Simultaneous Delivery of Beam to 3 Endstations
- Final Focus Test Beam Extension
- Hall A
- Tunnel
- Hall B
- Damage
- Power density
- Wavelength
- Obliquity
13Key Considerations for Conventional Facilities
Design
- Shielding Enclosure, Vehicle Access in Research
Yard - Vibration Stability
- Location of Far Hall, Elevation at Far Hall Site
- Potential for Expansion, Additional Undulators
14No Anticipated Change in Requirements for
- Research Yard
- Overpass
- Undulator Hall (exc. length)
- X-ray Tunnel (exc. length)
15Linac Coherent Light Source Project
Description