LCLS

Paul EmmaPaul Emma

LCLSLCLS Commissioning Status Commissioning Status [email protected]@SLAC.Stanford.edu

Nov. 11, 2008Nov. 11, 20081

SLAC National Accelerator Laboratory

LCLSLCLS Commissioning Status Commissioning StatusP. Emma for P. Emma for The The LCLSLCLS Commissioning Team Commissioning Team

LCLS FAC MeetingLCLS FAC Meeting

November 11, 2008November 11, 2008

LCLSLCLSMachine PerformanceMachine Performance

Estimated FEL PowerEstimated FEL Power

Ultra-Short Pulse PossibilitiesUltra-Short Pulse Possibilities

Plans for 2009Plans for 2009

Results published in FEL’08 and Linac’08 proceedingsResults published in FEL’08 and Linac’08 proceedings

Paul EmmaPaul Emma


Nov. 11, 2008Nov. 11, 20082


Phase-II Commissioning Highlights (2008)Phase-II Commissioning Highlights (2008)

Injector CommissioningInjector Commissioning: Apr-Aug, 2007 (: Apr-Aug, 2007 (DONEDONE))

Phase-II CommissioningPhase-II Commissioning: Dec-Aug, 2008 (: Dec-Aug, 2008 (DONEDONE) )

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

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

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

Bunch compression fully demonstrated down to 1-2 Bunch compression fully demonstrated down to 1-2 µµmm

New cathode installed with greatly improved thermal emittanceNew cathode installed with greatly improved thermal emittance

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

Electron bunch appears bright enough to drive Electron bunch appears bright enough to drive 1.5-1.5-ÅÅ FEL FEL

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

Paul EmmaPaul Emma


Nov. 11, 2008Nov. 11, 20083


Design and Typical Measured Parameters Design and Typical Measured Parameters (Aug. 2008)(Aug. 2008)

ParameterParameter symbolsymbol designdesign measuredmeasured unitunit

Final linac Final linac ee energy energy mcmc22 13.613.6 13.613.6 MeVMeV

Bunch chargeBunch charge QQ 11 0.250.25 nCnC

Initial bunch length (rms)Initial bunch length (rms) z0z0 0.90.9 0.750.75 mmmm

Final bunch length (rms)Final bunch length (rms) zfzf 2020 8-108-10 mm

ProjectedProjected emittance (injector) emittance (injector) xx,,yy 1.21.2 0.7-1.00.7-1.0 μμmm

SliceSlice emittance (injector) emittance (injector) ssxx,,yy 1.01.0 0.60.6 μμmm

ProjectedProjected emittance (linac end) emittance (linac end) LLxx,,yy 1.51.5 0.7, 1.6*0.7, 1.6* μμmm

Single bunch repetition rateSingle bunch repetition rate ff 120120 3030 HzHz

RF gun field at cathodeRF gun field at cathode EEgg 120120 115115 MV/mMV/m

Laser energy on cathodeLaser energy on cathode uull 250250 20-15020-150 μμJJ

Laser diameter on cathodeLaser diameter on cathode 22RR 1.51.5 1.21.2 mmmm

Cathode quantum efficiencyCathode quantum efficiency QEQE 66 0.7-70.7-7 101055

* horizontal slice emittance likely < 1 * horizontal slice emittance likely < 1 µµmm

Paul EmmaPaul Emma


Nov. 11, 2008Nov. 11, 20084


Bunch Compression & CSR Measured after BC2 (0.25 nC)Bunch Compression & CSR Measured after BC2 (0.25 nC)

zz > 25 > 25 mm

BC2BC2(4.3 GeV)(4.3 GeV)

BSYBSY(14 GeV)(14 GeV)

TCAVTCAV(5.0 GeV)(5.0 GeV)

550 m550 m

zz < 5 < 5 mm

old screen usedold screen used

L2L24 wires4 wires

zz 2 2 mmno

min

alno

min

al

Paul EmmaPaul Emma


Nov. 11, 2008Nov. 11, 20085


long long weekend weekend

run at run at 0.25 nC 0.25 nC with no with no tuningtuning

Emittance Near End of Linac Over Long WeekendEmittance Near End of Linac Over Long Weekend

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

((xxyy))1/21/2 = 1.04 = 1.04 mm

Paul EmmaPaul Emma


Nov. 11, 2008Nov. 11, 20086


Beam Appears Bright Enough for FEL Saturation at 0.15 nmBeam Appears Bright Enough for FEL Saturation at 0.15 nm

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

M. Xie method, with wakesM. Xie method, with wakes

FEL Power3D Gain Length

FEL Power3D Gain Length

Paul EmmaPaul Emma


Nov. 11, 2008Nov. 11, 20087


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

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

TAILTAIL

(not same data)(not same data)

0.14 0.14 µµmm

Paul EmmaPaul Emma


Nov. 11, 2008Nov. 11, 20088


zz 1 1 m ?m ?

8 kA?8 kA?

LiTrackLiTrack(no CSR)(no CSR)

Measurements and Measurements and SimulationsSimulations for 20-pC Bunch at 14 GeV for 20-pC Bunch at 14 GeV

Photo-diode signal on OTR after BC2 shows Photo-diode signal on OTR after BC2 shows minimum compression at minimum compression at 34.5 deg34.5 deg L2-linac phase.L2-linac phase.

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

Y. DingY. Ding

LCLS FEL simulation at 1.5 LCLS FEL simulation at 1.5 ÅÅ based on measured based on measured injector beam and injector beam and ElegantElegant tracking tracking with CSR at 20 with CSR at 20 pC.pC.

1.5 Å1.5 Å,,3.63.610101111 photons photonsIIpkpk = 4.8 kA = 4.8 kA 0.4 µm0.4 µm

SIMULATED FEL PULSESIMULATED FEL PULSE

Paul EmmaPaul Emma


Nov. 11, 2008Nov. 11, 20089


120-Hz RF & Controls Testing Done120-Hz RF & Controls Testing Done(Gun, L0a, L0b, L1-S, & L1-X)(Gun, L0a, L0b, L1-S, & L1-X)

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

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

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

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

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

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

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

Radiation measured are below posted limits at each klystronRadiation measured are below posted limits at each klystron

Gun temperature and vacuum response OK at 120 HzGun temperature and vacuum response OK at 120 Hz

M. StanekM. Stanek

Paul EmmaPaul Emma


Nov. 11, 2008Nov. 11, 200810


The The LCLSLCLS Laser Heater is Ready (except undulator) Laser Heater is Ready (except undulator)

IR & e- beams on IR & e- beams on OTR screens nowOTR screens now

Controls Controls readyready

Beam through chicane already…Beam through chicane already…

Paul EmmaPaul Emma


Nov. 11, 2008Nov. 11, 200811


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

EE 6 keV rms 6 keV rms (40 (40 m)m)

OTR screens (7)OTR screens (7)YAG screens (7)YAG screens (7)Wire scanners (7)Wire scanners (7)Dipole magnets (8)Dipole magnets (8)Beam stoppers (2)Beam stoppers (2)S-band RF acc. sections (5)S-band RF acc. sections (5)

RF GunRF GunSolenoidSolenoid

GunGunSpectrometerSpectrometer

RFRFDeflectorDeflector

X-band RFX-band RFacc. sectionacc. section

BC1BC1L1SL1S

L0aL0a

L0bL0b

2-km point in 3-km SLAC 2-km point in 3-km SLAC linaclinac 135-MeV135-MeV

SpectrometerSpectrometer

EmittanceEmittanceScreens/WiresScreens/Wires

EmittanceEmittanceScreen/WiresScreen/Wires

135 MeV135 MeV 250 MeV250 MeV

TD11TD11stopperstopper

Laser-HeaterLaser-Heater

Paul EmmaPaul Emma


Nov. 11, 2008Nov. 11, 200812


qq = 0.25 nC = 0.25 nC

xx = 0.61 = 0.61 µµmm

yy = 0.67 = 0.67 µµmm

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

Paul EmmaPaul Emma


Nov. 11, 2008Nov. 11, 200813


Important Dates for 2008/2009 Commissioning

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

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

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

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

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

dump)dump)

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

May 14, 2009:May 14, 2009: First beam in FEEFirst beam in FEE

July 2009:July 2009: Photons in NEHPhotons in NEH

August 2009:August 2009: Start AMO ExperimentStart AMO Experiment

Paul EmmaPaul Emma


Nov. 11, 2008Nov. 11, 200814


Re-establishRe-establishee to SL2 to SL2

LTU/LTU/UndUnd

Comm. Comm.

Firs

t Li

ght

in

Firs

t Li

ght

in

FEE

FEE

Firs

t Li

ght

in F

EH

Firs

t Li

ght

in F

EH

NEH Ops & NEH Ops & CommissioningCommissioning

JJJJ FFFF MMMM AAAA MMMM JJJJ JJJJ AAAA SSSS DDDD JJJJ FFFF MMMM AAAA MMMM JJJJ JJJJ AAAA SSSS OOOO NNNN DDDD JJJJ FFFF MMMM AAAA MMMM JJJJ JJJJOONNAA

2008 2009 20102008 2009 2010 2008 2009 20102008 2009 2010DownDownPPS

PPS

Linac/BC2 Linac/BC2 CommissioninCommissionin

g g FEL/FEEFEL/FEECommissioniCommissioni

ng ng Nov. 3, 2008Nov. 3, 2008

Inst

all

Inst

all U

ndula

tors

Undula

tors

MMDD

LCLSLCLS Installation and Commissioning Time-Line Installation and Commissioning Time-Line

LTU

/Und

In

stall

LTU

/Und

In

stall

PEP-I

I ru

n

PEP-I

I ru

n

ends

ends

FEE/N

EH

In

stall

FEE/N

EH

In

stall

PPS C

ert

. LT

U/D

um

pPPS C

ert

. LT

U/D

um

p

CD-4

CD-4

(7

/31

/201

0)

(7/3

1/2

01

0)

X-R

ays

in N

EH

X-R

ays

in N

EH

no

wn

ow

DDDown?Down?

FEH

Hutc

h B

OFE

H H

utc

h B

O

Paul EmmaPaul Emma


Nov. 11, 2008Nov. 11, 200815


LTU/Undulator/FEE/FEL CommissioningLTU/Undulator/FEE/FEL Commissioning

H. TompkinsH. Tompkins

+ heater+ heater

Documents

LCLS