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LCLS. LCLS Commissioning Status P. Emma for The LCLS Commissioning Team LCLS FAC Meeting November 11, 2008. Machine Performance Estimated FEL Power Ultra-Short Pulse Possibilities Plans for 2009. Results published in FEL’08 and Linac’08 proceedings.

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LCLS

LCLS Commissioning StatusP. Emma for The LCLS Commissioning TeamLCLS FAC MeetingNovember 11, 2008

  • Machine Performance

  • Estimated FEL Power

  • Ultra-Short Pulse Possibilities

  • Plans for 2009

Results published in FEL’08 and Linac’08 proceedings


Phase ii commissioning highlights 2008
Phase-II Commissioning Highlights (2008)

  • Injector Commissioning: Apr-Aug, 2007 (DONE)

  • Phase-II Commissioning: Dec-Aug, 2008 (DONE)

  • Great drive-laser uptime (99%) and good performance

  • Projected emittances 0.7-1.6 mm at 0.25 nC, 10 GeV

  • Routine 30-Hz e- to 14 GeV (~24/7 with ~90% up-time)

  • Bunch compression fully demonstrated down to 1-2 µm

  • New cathode installed with greatly improved thermal emittance

  • 20-pC bunch with 0.14-µm emittance (and 2-fs length?)

  • Electron bunch appears bright enough to drive 1.5-Å FEL

  • Phase-III commissioning started Nov. 3, 2008 – X-rays by July ‘09


Design and Typical Measured Parameters (Aug. 2008)

* horizontal slice emittance likely < 1 µm


Bunch Compression & CSR Measured after BC2 (0.25 nC)

sz < 5 mm

nominal

sz 2 mm

old screen used

sz > 25 mm

BC2

(4.3 GeV)

TCAV

(5.0 GeV)

L2

BSY

(14 GeV)

4 wires

550 m


Emittance near end of linac over long weekend

g(exey)1/2 = 1.04 mm

(3.3 days) May 24, 2008 00:01 to May 27 09:00

Emittance Near End of Linac Over Long Weekend

long weekend run at 0.25 nC with no tuning


Beam appears bright enough for fel saturation at 0 15 nm
Beam Appears Bright Enough for FEL Saturation at 0.15 nm

M. Xie method, with wakes

FEL Power

3D Gain Length

Calculation based on measured end-of-linac projected emittance values, measured peak current, and design undulator parameters (assuming undulator alignment and 0.01% rms slice energy spread – not yet measurable)


New cathode time sliced x emittance at very low charge

TAIL

New Cathode: Time-sliced x-Emittance at Very Low Charge

0.14 µm

(not same data)

20 pC, 135 MeV, 0.6-mm spot diameter, 400 µm rms bunch length (5 A)


sz 1 mm ?

LiTrack

(no CSR)

8 kA?

Measurements and Simulations for 20-pC Bunch at 14 GeV

Photo-diode signal on OTR after BC2 shows minimum compression at -34.5 degL2-linac phase.

SIMULATED FEL PULSE

Y. Ding

1.5 Å,

3.61011 photons

Ipk = 4.8 kA

ge 0.4 µm

LCLS FEL simulation at 1.5 Å based on measured injector beam and Elegant trackingwith CSR at 20 pC.

Horizontal projected emittance measured at 10 GeV, after BC2, using 4 wire-scanners.


120 hz rf controls testing done gun l0a l0b l1 s l1 x
120-Hz RF & Controls Testing Done(Gun, L0a, L0b, L1-S, & L1-X)

  • Measured 120-Hz “Timeslot” phase jitter for all injector RF stations:

    • Gun, L0a, L0b ~0.8 deg rms (tol. = 0.1 deg)

    • L1S ~0.17 deg rms (tol. = 0.1 deg)

    • L1X ~0.3 deg rms (tol. = 0.5 deg)

    • Observe ~1 deg difference on every 4th pulse (L0a, L0b, L1X)

    • Measurements confirmed with old SLC control system and new Beam Synchronous Acquisition system

  • More feedback development is needed (beam-based and RF-based)

  • Radiation measured are below posted limits at each klystron

  • Gun temperature and vacuum response OK at 120 Hz

M. Stanek


The lcls laser heater is ready except undulator
The LCLS Laser Heater is Ready (except undulator)

Beam through chicane already…

Controls ready

IR & e- beams on OTR screens now


Laser-Heater

OTR screens (7)

RF Gun

YAG screens (7)

Solenoid

Wire scanners (7)

Dipole magnets (8)

L0a

Beam stoppers (2)

S-band RF acc. sections (5)

Gun

Spectrometer

L0b

Emittance

Screens/Wires

Emittance

Screen/Wires

RF

Deflector

L1S

2-km point in 3-km SLAC linac

X-band RF

acc. section

BC1

135-MeV

Spectrometer

TD11

stopper

135 MeV

250 MeV

RF Deflector (LOLA) + special lattice configuration in spectrometer allows fine measurement of time-sliced energy spread (to <6 keV)

sE 6 keV rms (40 mm)


New emittance data at 135 MeV taken on Nov. 8, 2008 just 2 days into the turn-on

gex = 0.61 µm

q = 0.25 nC

gey = 0.67 µm


Important dates for 2008 2009 commissioning
Important Dates for 2008/2009 Commissioning days into the turn-on

  • Nov. 3, 2008: Startup (establish beam to end of linac again)

  • Dec. 3, 2008: Install laser-heater undulator (?)

  • Dec. 15, 2008: First beam through LTU & to dump?

  • Dec. 19, 2008: SLAC shuts down for holidays

  • Jan. 5, 2009: Startup again (establish beam in LTU & dump)

  • March 2, 2009: Install ~25 undulators & PPS cert. (~2 wks)

  • May 14, 2009: First beam in FEE

  • July 2009: Photons in NEH

  • August 2009: Start AMO Experiment


LCLS days into the turn-on Installation and Commissioning Time-Line

InstallUndulators

First Light in FEH

PPS Cert. LTU/Dump

LTU/Und Install

X-Rays in NEH

First Light in FEE

CD-4 (7/31/2010)

FEE/NEH Install

FEH Hutch BO

PEP-II run ends

now

J

F

M

A

M

J

J

A

S

O

N

D

J

F

M

A

M

J

J

A

S

O

N

D

J

F

M

A

M

J

J

D

M

D

A

2008 2009 2010

Down

Down?

PPS

LTU/Und

Comm.

NEH Ops & Commissioning

Linac/BC2 Commissioning

Re-establish

e- to SL2

FEL/FEE

Commissioning

Nov. 3, 2008


Ltu undulator fee fel commissioning
LTU/Undulator/FEE/FEL Commissioning days into the turn-on

H. Tompkins

+ heater


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