1. Risk Assessment Contingency Endgame
John N. Galayda – Director of LCLS Construction
March 30, 2009

2. Risks
Technical
Injector through undulator system, risks are understood and controlled
Electron beam systems performing well
X-Ray systems construction complete
Thoroughly tested functionality prior to delivery
Risks associated with damage to optics
Attenuator, sacrificial test coupons, spare mirrors
Early & ongoing testing of B4C damage threshold

3. Risks
Schedule
Attempting to advance the schedule for AMO experiments compared to baseline schedule
Accelerate commissioning of upstream hardware
Accelerate installation
Not a concern for CD-4
Hutch construction schedule is on critical path to CD-4, with 108 days float to CD-4
Space renovation schedule has less float, 83 days float to CD-4
Schedule for contingency allocation
Get bids for space renovation by end of April

4. Risks Cost Space renovation Overruns late in the project
Perform a bottoms-up cost estimate on all remaining work (Nov08)
Perform monthly EAC and contingency analysis
FEE & AMO installation
Perform a readiness review
Monitor detailed installation planning schedule
Owner-directed changes (hutches)
Perform cost estimates at 30%, 60% & 90%
Design-to-cost A/E contract
Space renovation
Scope of re-habilitation of Bldgs 28 & 750 is controllable
GMAX for new space

5. Cost Risks Change orders for TCCo subs are largely negotiated
$600K return on allowances
$200K unused field change order BA
Claims ($4.6M) still the biggest risk
Accruals for claims have been established and subjected to external review
Enact endgame plans for construction budget
Revise accruals when new information is obtained
FEH Hutches – Today’s presentation
Space renovation is last major CF cost driver
We had kept $2.5M in the baseline for claims. Based on accrual review we are keeping $1.4 in the baseline. I am not optimistic that our position on the claims will be simply accepted by the contractor.

6. Safety Risks New work planning process
LCLS personnel are experienced and well-trained
New civil construction contractors onsite
LCLS experience, lessons learned
X-ray commissioning
Readiness Process

7. January Contingency Analysis

8. Scope Restoration Candidates

9. LCLS End-Game Timeline
Design LCLS Office Space w/Options
OPA Review (DC)
Turner Punchlist Done
Turner Constr Comp
CD-4 (7/31/2010)
Award LCLS Office Space
now
Construct LCLS Office Space A S O N D J F M A M J J A S O N D J F M A M J J
2008
2009
2010
ETC Complete
w/SXR
Construct H4 & H5
H4 & H5 BO
Design H4, H5 H6
1st Light in FEH
1st Light in FEE
X-Rays in NEH
Award H4 & H5
H6 TBD
Timeline allows endgame scope decisions to be made sequentially. Final scope contingency (space renovation) includes options.

10. Decision Timeline

14. Stability is not so far from the goal (~10%)
Normalized phase space centroid jitter after BC1 (~4% of rms beam size)
RMS AxN = 3.9%
RMS AyN = 3.4%
Stability is not so far from the goal (~10%)
1-s beam size
D. Ratner
… near end of linac (10-15% of rms beam size)
RMS AxN = 14%
RMS AyN = 9%
DE/E jitter  0.03%
DQ/Q jitter  1.5%
Q = 0.25 nC

15. Measuring Bunch Arrival Time Jitter
S-band (2856 MHz)
BPM
V(t)
Q = 0.25 nC
TCAV ON
TCAV OFF
BPM Y Position (mm)
slope = mm/deg
Now measure BPM jitter both with transverse RF OFF, and then ON (at constant phase)
Dt  ±0.6 ps
9 mm rms
110 mm rms
Timing Jitter (w.r.t. RF) = (110 mm)/(2.34 mm/deg) = deg  46 fsec rms

16. Other Commissioning Results
Measured effect of
vacuum chamber
wake fields- good
agreement with
predictions

17. Trajectory is Straight Enough for 1.5 Angstom

18. Diagnostics Working Well
3 nanoradian kick easily discerned
Submicron motion of electrons easily discerned

19. Predicted X-Ray FEL power, computed from electron beam properties
M. Xie method, with wakes
FEL Power
3D Gain Length
Predicted X-Ray FEL power, computed from electron beam properties

20. Measurements and Simulations for 20-pC Bunch at 14 GeV
sz  1 mm ?
8 kA?
LiTrack
(no CSR)
Photo-diode signal on OTR screen after BC2 shows minimum compression at L2-linac phase of deg.
PRELIMINARY
gex  0.4 mm at sz  1 mm
Y. Ding
1.5 Å,
3.61011 photons
Ipk = 4.8 kA
ge  0.4 µm
Horizontal projected emittance
measured at 10 GeV, after BC2,
using 4 wire-scanners.
LCLS FEL simulation at 1.5 Å based on measured injector beam and Elegant tracking, with CSR, at 20 pC.

21. 15 Å, 1.2 fs 20-pC Bunch at 4.3 GeV, 15 Angstrom
Approaches a Longitudinally
Coherent Single Spike
z = 25 m
(power profile at z = 25 m varies from shot to shot due to noisy startup)
Y. Ding
15 Å,
z = 25 m,
2.41011 photons,
Ipk = 2.6 kA,
ge  0.4 µm
1.2 fs
LCLS FEL simulation at 15 Å based on measured injector beam and Elegant tracking, with CSR, at 20 pC.