Status of LCLS A. Brachmann, SLAC National Accelerator
Laboratory
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2 Introduction How do we operate Current Machine Performance
Developments of the past year Future Outlook LCLS is operated by :
Accelerator Directorate LCLS Directorate
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3 Routine Operation 1.Currently we are in Run 7 2.24/7
Operation is (mostly) routine -5 days of experiment time -Typically
2 instruments of 6 share 5 day beam time (alternating 12 hour
shifts) 2 Months of Run 7: CXI XPP XCS MEC AMO SXR
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4 X-Ray Pulse Energies Records
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5 Machine Development (MD) 1.MD time is shared between
Accelerator and X-Ray instruments (60/40) 2.2 Days of Maintenance /
Machine Development per week -Machine Development includes
Accelerator and X-Ray instrument issues -Used to develop and
implement new operational modes -May change schedule in the future
to optimize available time for machine physics 3.Accelerator Uptime
is 95 % (+) -Focus of MD work shifts more towards photon issues
-Efficiency gain by optimizing X-ray Operation -For example beam
sharing is part of this strategy
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6 Accelerator Uptime Detailed tracking of accelerator
performance is necessary to guide investment of very limited
budget!
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7 Recent Developments - HXRSS Hard X-Ray self seeding
Successful demonstration of principle User operation has taken
place Outstanding issues: Machine stability Diagnostics (mainly
spectrometer for tune up) 20 eV BW0.5 eV BW
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8 Recent Developments Low Energy Low Energy Operation 280 eV
X-Rays (Previous limit ~ 580 eV) Enables science of Carbon and
Nitrogen Main work is machine tuning for lower electron beam energy
(2.2 GeV) Issues are -larger electron and photon beam sizes -Damage
thresholds of X-Ray optics (B4C coated mirrors) Machine apertures
and Radiation Physics First user experiments have been
conducted
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9 Whats next XTCAV XTCAV Transverse cavity downstream of the
undulator Measurement of electron bunch length and pulse profile
correlate to X-ray bunch Ongoing project, commissioning in the
spring/early summer of 2013
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10 Whats next DELTA Undulator DELTA undulator 3 meter delta
undulator at the end of current undulator system Polarization
control of X-ray beam Currently we are developing the prototype,
mainly to ensure sound mechanical design and development of
magnetic measurement technique Anticipated availability for users
is about a year away Vacuum Chamber PROTOTYPE
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11 Whats next SXRSS SXRSS Soft X-ray seeding similar to HXRSS
but grating based Project just started
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12 Longer term ~ 2 year Additional undulators towards TW Room
for additional undulators Currently we have 5 additional undulators
designated as spares Installed are 33 section (minus 1 for HXRSS,
minus 1 for SXRSS) Several M$ project Configuration choices have to
be made (e.g. DELTA, SHABs, THz system) Need to include user
community to arrive ata decision. Total possible undulator number
of 36-38.
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13 Whats next a lot more Accelerator energy jitter reduction
Upgrade of 50 year old Accelerator Technology Improvement of pulse
to pulse energy stability Benefits both SASE and seeded beams Many
other smaller projects, e.g. Diagnostics use THz radiation Updated
RF controls and diagnostics - uTCA FEL tricks iSASE, multibunches,
two color Ryan Coffee
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14 LCLS - II Injector @ 1-km point Sectors 10-20 of Linac (1
km) (with modifications) X-ray Transport Optics/Diagnos tics Bypass
LCLS Linac In PEP Xport Line (extended) New Beam Transport Hall
SXR, HXR Undulators s14
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15 LCLS II requires new facilities construction is about to
begin LCLS-1 beamline Extension of Beam Transport Hall (162m)
Undulator Hall (302m) (302m) FrontEndEnclosure(92m) ExperimentHall
15m x 80 m UtilityPlant ServiceBuilding Access Road Main effort is
anticipated for a significant duration mainly during 2014
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16 LCLS II Capabilities LCLS-II will provide expanded spectral
range Up to 13 keV (above Selenium K-edge) @ 10.5-13.5 GeV Down to
250 eV (Carbon K-edge) @ 7-10 GeV 302m undulator tunnel -Space to
accommodate future enhancements: -Seeding -polarization control -TW
peak power Tuning the X-Rays with both undulator gap and Electron
Beam Energy
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17 LCLS II Immediacy LCLS II injector at Sector 10 construction
is underway Transition to operations in 2015 2016 time frame It
will serve as an R&D facility befor LCLS II linac and FEL
commissioning Continuing resolution may delay progress unknown
still
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18 LCLS X-ray Facilities Far Experimental Hall Near
Experimental Hall AMO SXR XPP XCS CXI MEC X-ray Transport Tunnel
200 m Start of operation Oct-09AMO November-11 XCS February-11CXI
October-10XPP May-10SXR MEC May -12
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19 Materials under Extreme Conditions (MEC) Instrument LCLS
Science Update High Energy Density Science Shock Physics Warm Dense
Matter
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20 Proposal Statistics 177 proposals for beam time between July
and March, 2014
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21 LCLS Publication Statistics
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22 Update on X-ray Beam Multiplexing XPP CXI MEC Double Crystal
C*(111) First C*(111) crystal is 100m thick (highly transmissive
for X-rays outside Bragg reflection bandwidth) 71% beam
transmission at 8.33 keV Wavefront distortion is minimal First
simultaneous experiments test will occur in the near future The XPP
Large-Offset Double-Crystal Monochromator now has a pair of diamond
(111) crystals obtained through TISNCM (Moscow) and APS