Injector Drive Laser Update Sasha Gilevich, Dave Dowell FAC Review, October 12, 2004

Dave Dowell, Sasha GilevichFacilities Advisory Committee

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October 12 2004Injector Drive Laser Update

Injector Drive Laser UpdateSasha Gilevich, Dave DowellFAC Review, October 12, 2004

•Drive Laser S20 Facility Overview•Procurement Plan

–Request for Proposals–Perspective Vendors

•Launch and Conditioning System Design•UV Conversion of Temporally Shaped Pulses•Preliminary Pulse Shaping Results•X-Ray Endstation Laser Specifications•Summary and Conclusions


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Transport Tube

UV Launch and Condition.

Laser Heater

Drive Laser

RF Gun

Laser Bay

Photocathode Gun & Launch System

Laser Heater

Transport Tubes

Electron Diagnostic

Sector 20 Alcove

Sector 20

Drive Laser System


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Layout of Laser Room at S20

2 3 2 4 2 5 2 6 2 7 2 8 29 3 23 13 0

6 / 1 5 /0 4 V e rs io n

4 'x 6 '

6 'x 1 5 '6 'x 1 5 '

3210M e t e rs

I N C H E S1 0 08 06 04 02 00 P20-17P20-16

FRONT

3'-6"

FRONT

P20-15P20-14

MODULATORSTA 20-8(EXISTING)

KLYSTRON

CONTROLS RACK (EXISTING)

RF CONTROL RACKS (NEW)

LKG-01LKG-02

LKG-03LKG-04

LKG-05LKG-06

FRONT

I&C CONTROL RACKS (NEW)

LKG-07LKG-08

LKG-09LKG-10

LKG-11LKG-12

LKG-13LKG-14

LKG-15LKG-16

LKG-17LKG-18

LKG-19LKG=20

LKG-21LKG-22

LKG-23LKG-24

6' 8"

5'-1

1"

2'-4

"

20'-0"

14'-0

"

General Purpose4plex outlet

3phase/208V

N Laser Power PanelSee Table I

Laser BayControlled Entry

Injector VaultControlled Entry

Laser BayStorage & LocalControl Area

Load LockRoom LKA-04

LKA-05

LKA-02LKA-03

LKA-01

LKA-00

Control Rack (typ)

Power Supply & Control RacksRF Hut

LaminarFlow Hood

NitrogenGasBottles

Laser PowerPanel #1

Laser PowerPanel #2

•Space & Utilities for 2 Drive Lasers


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Drive Laser Procurement Process

Write Request for Information

(RFI)

Drive Laser Technical Review

July 21, 2004

Evaluate RFI & Technical Review Responses

Write Request for Proposal (RFP)

Write & Approve Advance Procurement Plan (APP)

Drive Laser Evaluation Committee Ranks

Proposals

Submit RFP to Vendors

Selected Vendors Present ProposalsTo Evaluation &

Technical Committees

Evaluation Committee Selects Vendor & Awards

Contract


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UV Pulse SpecificationsParameter System Requirement Operating Range/ Comments

Pulse repetition rate 120 Hz Operating rates of 1, 10, 30, 60 and 120 Hz

Pulse Energy 2.5 mJ at 255nm Continuously adjustable from 0.1 to 2.5 mJ

Central Wavelength1 255 nm 252-258 nm

Pulse-to-pulse energy jitter

2.5 mJ at 255nm (see Fig.2),

Less than 2%(rms) variation

Pulse timing jitter2 <200 fs (rms), for frequencies>0.1Hz

Temporal pulse shape3 Uniform, flat top, selected slope on flat-top within 3% of goal, and <8% peak-to-peak over flattop, 1 ps rise and fall at 10% to 90%

10% to +20% slope

Pulse length 10 ps (fwhm) 5 to 20 ps1. Longer wavelength is acceptable, but requires higher energy due to the reduction in cathode QE2. Measured with respect to the 119 MHz clock – RF signal3. The temporal pulse shape is nominally flat but the slope of the pulse must be adjustable from -10%

(head 10% higher than the tail) to +20% (head 20% lower than the tail). Some adaptive temporal shaping will be required


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UV Pulse Specifications

Parameter System Requirement Operating Range/ Comments

Radial shape4 Uniform, flat top, <10% peak-to-peak variation within flattop plateau for any single pulse)

Centroid Position Stability

Less than 3% of the beam radius (1/e2 level) Measured at the laser output plane

Pointing Stability Less than 25μrad Measured at the laser output plane

MTBF5,6 >5000 hours

4. Spatial Pulse shaping is optional. In case no spatial shaping is done, M2 should be <1.15. Regular maintenance every 1000 hours performed either by the vendor or SLAC/LCLS is permitted.6. The vendor should provide information on the reliability of their laser system based upon customer

experience.


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Request for Proposal (Details 1)Drive Laser will be a fully purchased and

integrated system from the single vendor

Optical transport, launch system, and diagnostics to be built by SLAC

Integration and DeliveryFull Integration and testing at the vendor’s site

Installation and check out at SLAC

Delivery date approximately one year after the award


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Request for Proposal (Details 2)

Specifications and Technical ApproachMOPA system using CPA scheme

Oscillator is synchronized to an external RF source

Harmonic Generation

Pulse Shaping techniques (Temporal and optional Spatial) with adaptive component determined by the vendor

Cryogenic cooling of the power amplifier crystal


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Other System Requirements

IR beam for the Laser Heater

Remote operation and monitoring

Control system compatible with the rest of the LCLS controls (EPICS)

Machine protection features

Possibilities for upgrade


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Proposal Requirements and Details

Development plan for the high risk components

Subcontract components are permitted, Integration by the vendor

Proposal includes schedule and milestones

Includes critical spares list and test schedule

Warranties and Service Contracts

Preventive Maintenance by the vendor


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UV Launch System

Spatial Shaper Launch Grating

Telescope lenses

Cathode Window

Flattener

Steering Stabilization

Telescope lensesCathode Window

Grating and Trimmer


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Launch System Layout


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Spatial Beam Shaping

Newport Refractive Beam Shaper Two aspheric lenses

Input Beam Output Beam


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Spatial Profile Flattening of Ultraviolet Laser Pulses with Aspheric Refractive Optics

B.F. Murphy, P.R. Bolton, A. Brachmann, J.F. Schmerge

50 100 150 2000

2

4

6x 10

-3

The results of using the IBM refractive aspheric beam shaper at the output of the GTF laser (2psec, 263nm, 500μJ)

InputOutput

20 40 60 80 100 120 1400

0.005

0.01

0.015

0.02

40 60 800

0.01

0.02

0.03


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Imaging of the Spatially Shaped BeamPreliminary Optical Design (ZEMAX)

Illumination on the Cathode

Input of the Beam Shaper


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UV Conversion of the Temporally Shaped Pulses

THG in BBO (0.2mm)

Input Bandwidth 12nm

E400nm=4.4mJ E800nm=2.2mJ

Output

Efficiency 26%

266nm

Modified SNLO code provided by Arlee Smith (Sandia National Lab)


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UV Conversion of the Broadband Temporally Shaped Pulses

THG in BBO (0.1mm)

Input Bandwidth 12nm

E400nm=4.4mJ E800nm=2.2mJ

Output

Efficiency 15%

266nm

Modified SNLO code provided by Arlee Smith (Sandia National Lab)

266nm


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BNL/SLAC/INFN Laser Pulse ShapingExperiment at BNL/DUVFEL


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Dazzler - FastLite Inc.acousto-optic dispersive filter

(P. Tournois et al.)

acoustic wave (computer programmable) - spectral amplitude - temporal phase

TeO2 crystal

Dazzler in DUVFEL Drive Laser

Courtesy of Yuzhen Shen, Carlo Vicario, B. Sheehy, XJ Wang


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DUVFEL Drive Laser Layout with Dazzler

Millennia Laser

Tsunami Laser

Spec

trum

Ana

lyze

r

Aut

o-co

rrel

ator

OpticalIsolator

StretcherCompressor 1

Regenerative Amplifier

2-pass Amplifier

2-pass Amplifier

VariablePowerDivider

Phot

ocat

hode

GC

R-1

70 Y

AG

Las

er

GC

R-1

50 Y

AG

Las

er

Photodiode

Pow

erA

tten

Autocor-rellator

SpotImaging

Power Mon

Optical Relay, 14 meters

Monument

PowerAtten

SpatialFilter

Compressor 2

Optical Relay, ~35 metersSeedingAnd Diagnostics

Daz

zler

Millennia Laser

Tsunami Laser

Spec

trum

Ana

lyze

r

Aut

o-co

rrel

ator

OpticalIsolator

StretcherCompressor 1

Regenerative Amplifier

2-pass Amplifier

2-pass Amplifier

VariablePowerDivider

Phot

ocat

hode

GC

R-1

70 Y

AG

Las

er

GC

R-1

50 Y

AG

Las

er

Photodiode

Pow

erA

tten

Autocor-rellator

SpotImaging

Power Mon

Optical Relay, 14 meters

Monument

PowerAtten

SpatialFilterSpatialFilter

Compressor 2

Optical Relay, ~35 metersSeedingAnd Diagnostics

Daz

zler

Courtesy of B. Sheehy


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Laser Pulse Shaping Without Amplification


Before Stretcher After Stretcher


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Preliminary Laser Shaping Results

Ti:Sapph Oscillator

Dazzler

Stretcher

Amplifier

Compressor

tripler

800 nm9 nJ100 fsec

5 nJ200-400 psec

25 mJ170-350 psec

15 mJ0.1 - 30 psec

266 nm1.8 mJ

temporal

risetime: 20-80% 2.5 psec10%-90% 4 psec

12.3 psec FWHM

Ti:Sapph OscillatorTi:Sapph Oscillator

DazzlerDazzler

StretcherStretcher

AmplifierAmplifier

CompressorCompressor

tripler tripler

800 nm9 nJ100 fsec

5 nJ200-400 psec

25 mJ170-350 psec

15 mJ0.1 - 30 psec

266 nm1.8 mJ

temporaltemporal

risetime: 20-80% 2.5 psec10%-90% 4 psec

12.3 psec FWHM



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Specifications for the X-Ray Endstation Lasers

Parameter Nominal Spec

Pulse Length 30fs

Wavelength 800nm

Repetition Rate 1KHz

Pulse Energy 1mJ


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Summary and ConclusionsS20 drive laser facility requirements definedTitle II facility design startedDrive Laser (DL) Technical Review Committee created

1st meeting July 21, 2004

RFP written & procurement process established:DL Technical Review Committee (advises)DL Evaluation Committee (selects)

DL effort consists of three elements:Vendor supplies DL including shaping & UV conversionLCLS provides launch & conditioning systemLCLS performs shaping & UV conversion R&D with other labs (BNL, LLNL…)

Preliminary studies indicate difficulty converting shaped pulsesPreliminary Specs for X-Ray Endstation Lasers

Documents

Injector Drive Laser Update Sasha Gilevich, Dave Dowell FAC Review, October 12, 2004