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

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

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

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

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.

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

January Contingency Analysis

Scope Restoration Candidates

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.

Decision Timeline

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

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 = -2.34 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) = 0.047 deg  46 fsec rms

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

Trajectory is Straight Enough for 1.5 Angstom

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

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

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 -34.5 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.

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.