1 Injector Lasers Overview Sasha Gilevich, SLAC April 29, 2004 Drive Laser Specifications Challenges...
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Transcript of 1 Injector Lasers Overview Sasha Gilevich, SLAC April 29, 2004 Drive Laser Specifications Challenges...
1
Injector Lasers OverviewSasha Gilevich, SLAC
April 29, 2004
Drive Laser SpecificationsChallengesSystem DescriptionLaser ProcurementR&D EffortUV conversion
Lasers Overview
04/29/2004 Sasha Gilevich
2
Sector 20 LaserLaser Bay
Transport Tube
UV Launch and Condition.
Accelerators
Lasers Overview
04/29/2004 Sasha Gilevich
Laser Heater
Drive Laser
RF Gun
10 m
4
UV Beam Specifications at Photocathode
Parameter Nominal spec Tolerance
Energetic: wavelength 255nm nom. + < 5 nm
- 0 nm
pulse energy
> 0.20 mJ
(for 1 nC production with 3x10-5 QE)
< 2 % rms variation
Spatial: fluence profile
Uniform (nom.) (adjustable)
< 20 %
(peak-to-peak)
spot radius 1.2 mm < 4 %
(shot-to-shot)
centroid position
< 10 % radius
(RMS over multiple shots)
Lasers Overview
04/29/2004 Sasha Gilevich
5
UV Beam Specifications at Photocathode (cont.)
Parameter Nominal spec Tolerance
Temporal: rep rate 120 Hz
power profile Uniform
(adjustable plateau slope)
< 5%
(RMS noise on the plateau)
profile FWHM 10 psec
adjustable to 20 psec
< 2 % RMS
(over multiple shots)
profile rise/fall times
1.0 psec (10% - 90%)
timing jitter (with respect to RF)
< 0.5 psec
(shot-to-shot)
Lasers Overview
04/29/2004 Sasha Gilevich
Sasha Gilevich
[email protected] Overview
04/29/2004 Sasha Gilevich
6
ChallengesShort rise/fall timeRequires temporal pulse shaping
ReliabilityThe system should operate 24x7
Pumping systemLife time of the flash lamp – about 300-500h => Changing Lamps Every ~2wksLaser Diode Lifetime ~ 10000hrChanging Diodes Every ~ 60 wks (~1 yr)
UV conversion unit Shaping hardware
Automatic Operation
Lasers Overview
04/29/2004 Sasha Gilevich
Input pulse
0
0.2
0.4
0.6
0.8
1
-15 -10 -5 0 5 10 15
Time, psec
Nor
m. P
ower
Non shaped
Shaped
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Losses Component Efficiency
UV Conversion Unit 8 - 12%
Dichroic Separation 90 - 95%
UV Pulse Energy Control 85 - 95%
Spatial Filter, Telescope, Collimator Flattener 70 - 80%
Relay System to UV Launch Table (through vertical transport tube) 60 – 80%
UV Launch Optics to Grating 80 – 90%
UV Launch Grating 45 – 55%
Final Trimmer 70 – 80%
UV Waveplate, Vacuum Window 90 -96%
Net Transport and UV Conversion Efficiency – 0.7 – 2.1%
Lasers Overview
04/29/2004 Sasha Gilevich
8
Drive IR Laser Specifications
Parameter Nominal spec Tolerance
Energetic: wavelength 765 nm (10 nm bandwidth)
+ < 15 nm
- 0 nm
pulse energy > 25 mJ (1 nC production with 3X10-5 QE)
< 1 % rms variation
(over multiple shots)
Spatial: fluence profile Uniform (nom.) (adjustable)
< 10 %
(peak-to-peak)
Lasers Overview
04/29/2004 Sasha Gilevich
9
Drive IR Laser Specifications (cont.)Parameter Nominal Spec Tolerance
Temporal: rep rate 120 Hz
power profile uniform (adjustable)
< 3 %
(RMS noise on the plateau)
profile FWHM 10 psec
(adjustable to
20 psec)
< 2 % RMS
(over multiple shots)
profile rise/fall times 2 psec
Timing jitter
(with respect to the external RF source)
< 0.5 psec
(shot-to-shot)
Lasers Overview
04/29/2004 Sasha Gilevich
10
Drive LaserTiS
Oscillator (119MHz)
StretcherPulse
Shaper
Amplifiers
(preamplifier + final amplifier)
CompressorUV
Converter
To the Laser Heater
To EO Diagnostics
Lasers Overview04/29/2004 Sasha Gilevich
To the Cathode
UV specs
IR specs
Tra
nspo
rt t
o th
e T
unne
l
UV Launch and Conditioning
(at the Gun)
Pumps
TiS Oscillator
(119MHz)
TiS Oscillator
(119MHz)Stretcher
TiS Oscillator
(119MHz)Stretcher
TiS Oscillator
(119MHz)Stretcher
TiS Oscillator
(119MHz)
Pulse Shaper
Stretcher
TiS Oscillator
(119MHz)
Pulse Shaper
Stretcher
TiS Oscillator
(119MHz)
Pulse Shaper
Stretcher
TiS Oscillator
(119MHz)
Pulse Shaper
Stretcher
TiS Oscillator
(119MHz)
Pulse Shaper
Stretcher
TiS Oscillator
(119MHz)
Pulse Shaper
Stretcher
TiS Oscillator
(119MHz)
Pumps
11
Drive Laser Development by Outside Vendors
Lasers Overview
04/29/2004 Sasha Gilevich
Demonstrated capability to build the IR system according to the specs
Can ship the system in 12 months
Can provide full integration
Will have service agreement
Showed similar estimated costs
Need some development to be done
Have expertise in UV conversion
All three companies
12
Drive Laser Development by Outside Vendors
Procurement Plan:
Prepare Bid Package – June 2004Receive Vendors Proposals – August 2004Have Technical Review of Proposals – September 2004Evaluate the proposals – September 2004Issue the Award – October 2004
Lasers Overview
04/29/2004 Sasha Gilevich
13
Drive Laser Design IssuesUnresolved Issues:
Choice of the Temporal Pulse Shaping Technology Amplification of the Temporally shaped pulses Efficient UV Conversion of broadband temporally shaped pulses 25 mJ in the IR at 120 Hz is difficult
R&D: Temporal shaping R&D conducted with BNL UV conversion R&D with ANL Experiments at SLAC with spectral filtering Modeling of the UV conversion using SNLO software Temporal Shaping development by the outside vendor UV Conversion development by outside vendor
Lasers Overview
04/29/2004 Sasha Gilevich
14
R&D Effort
UV Conversion (ANL/SLAC)
Baseline UV Conversion tests
Spatial Profile Shaping
UV Launching
Sasha Gilevich
Lasers Overview [email protected]
04/29/2004 Sasha Gilevich
04/29/2004 Sasha Gilevich
[email protected] Overview
15
R&D Effort
Pulse Shaping (BNL/INFN/SLAC)
Baseline Pulse Shaping Tests
UV Conversion Tests with Pulse Shaping
Evaluate Effects of Shaping on the E-beam
Pulse Shaping (SLAC)
Temporal Shaping of IR pulses with spectral filtering and compressor tuning
Sasha Gilevich
Lasers Overview [email protected]
04/29/2004 Sasha Gilevich
04/29/2004 Sasha Gilevich
[email protected] Overview
16
UV Conversion
UV Conversion SetupUV Conversion Setup
SHG Nonlinear crystal
THG Nonlinear crystal
λ=255nm
Dichroic Separation Unit
To EO Diagnostic
To the Laser Heater
Dichroic Separation Unit
THG Nonlinear crystal
SHG Nonlinear crystal
λ=765nm
Dichroic Separation Unit
Dichroic Separation Unit
Dichroic Separation Unit
λ=765nm
SHG Nonlinear crystal
λ=382.5nm
Dichroic Separation Unit
Dichroic Separation Unit
Dichroic Separation Unit
To EO Diagnostic
To the Laser Heater
To the Photocathode
To EO Diagnostic
Lasers Overview
04/29/2004 Sasha Gilevich
[email protected] Overview
04/29/2004 Sasha Gilevich
[email protected] Overview
04/29/2004
17
UV Conversion Modeling
Optimizing the crystalsType of crystal
Crystal Length
Optimizing the input beamBeam Diameter
Beam Shape
Input (IR and blue) beams energy ratio (for THG)
Considering different setup methodology
Sasha Gilevich
[email protected] Overview
04/29/2004
18
Nonlinear CrystalsNonlinear Crystals
Crystal Walk off
765/382.5
mrad
GVD
765/382.5
10^5cm /sec cm-1
Deff
pm/V Angle
Tolerance
mrad cm
Tempe-rature Range Ko cm
Accept. Bandwidth
cm-1 cm
BBO I
o+o=e 0 / 70.32 -0.48 /
-1.16 1.99 0.33 17.31 15.34
CLBO I
o+o=e 0 / 36.50 -0.33 /
-0.860.503 0.70 23.71 27.18
LBO xy
o+o=e 0 / 17.52 -0.32 /
-0.82 0.722 1.35 14.69 24.02
SHG
Sasha Gilevich
[email protected] Overview
04/29/2004
19
Nonlinear CrystalsNonlinear Crystals
Crystal Walk off
765/382.5/ 255
mrad
GVD
765/382.5/ 255
10^5cm /sec cm-1
Deff
pm/V Angle
Tolerance
mrad cm
Tempe-rature Range Ko cm
Accept. Bandwidth
cm-1 cm
BBO I
o+o=e 0 / 0 / 87.38
-0.48 / -1.23 / -2.21
1.82 0.17 5.84 3.98 / 7.09
CLBO I
o+o=e 0 / 0 /
33.98 -0.33 / -0.89 / -1.61
0.799 0.50 6.39 7.05 / 12.53
KDP
o+o=e 0 / 0 /16.43 -0.24 /
-0.83 / -1.45
0.469 1.02 2.36 7.89 / 14.5
THG
Sasha Gilevich
[email protected] Overview
04/29/2004
20
UV Conversion Modeling
SHG in LBO and BBO I D=5mm E=20mJ
123456789
101112131415161718
0 0.5 1 1.5 2 2.5 3 3.5 4
Crystal Length, mm
Acc
p. B
an
dw
idth
,nm
O
utp
ut 4
00
nm
En
erg
y, m
J
Accpt Bw LBO E400 LBO
Accp Bw BBO E400 BBO
Sasha Gilevich
[email protected] Overview
04/29/2004
Choice of the Crystal SHG
Lasers Overview
04/29/2004
BBO narrowband output
LBO narrowband output
LBO accept bandwidth
BBO accept bandwidth
21
UV Conversion Modeling
Sasha Gilevich
[email protected] Overview
04/29/2004
Choice of the Crystal THG
Lasers Overview
04/29/2004
THG BBO I D=5mm E400/E800=13/6.46mJ and 11.68/7.78mJBBO I (solid) and KDP I (broken)
0123456789
101112
0 0.5 1 1.5 2 2.5 3 3.5 4
Crystal Length, mm
Pu
lse E
nerg
y,
mJ,
Accp
t B
an
dw
idth
, n
m
E267 BBO Accp Bw IR BBOAccp Bw blue BBO E267 KDPAccp Bw IR KDP Accp Bw blue KDP
KDP narrowband output
BBO narrowband output
22
UV Conversion Modeling
THG BBO I D=5mm E400/E800= 11.68/7.78mJSpatial Shaped ( Broken line) and Gaussian (Solid Line)
0
2
4
6
8
10
12
14
0 0.5 1 1.5 2 2.5 3 3.5
Crystal Length, mm
Puls
e E
nerg
y, m
J
E267 n=5
E267 n=1
Spatial Shaping
Sasha Gilevich
[email protected] Overview
04/29/2004
Shaped
Gaussian
Input 20mJ T=10ps Narrowband
Gaussian
Shaped
Input pulse
050
100
150200250300
350400450500
550600650
-6.00E-03 -4.00E-03 -2.00E-03 0.00E+00 2.00E-03 4.00E-03 6.00E-03
x, m
Flue
nce,
J/m
^2
23
UV Conversion ModelingSpatial Shaping
THG in BBO I E800/E400=7.78mJ/11.68mJ D=5mmD=5mm n=5
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
1.1
-5.0E-03 -4.0E-03 -3.0E-03 -2.0E-03 -1.0E-03 0.0E+00 1.0E-03 2.0E-03 3.0E-03 4.0E-03 5.0E-03
X, m
Norm
. FLu
ence
L=1mm
L=1.25mm
L=1.5mm
THG in BBO I D=5mm, E800/E400= 7.78/11.68mJ n=5
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
1.00
1.10
-12 -10 -8 -6 -4 -2 0 2 4 6 8 10 12
T, ps
Norm
Pow
er
L=1mm
L=1.25mm
L=1.5mm
Sasha Gilevich
[email protected] Overview
04/29/2004
24
UV Conversion Modeling Temporal and Spatial ShapingSHG BBO I L=1mm Input E=20mJ Pulse Duration = 10 ps
Sasha Gilevich
[email protected] Overview
04/29/2004
Output 400nm Beam
Output 800nm Beam
800nm
400nm
04/29/2004
Lasers OverviewLasers Overview
25
Status
The Laser Specifications are definedPotential vendors were selectedRequirements for the Laser Bay are specifiedR&D effort is outlinedBaseline WBS has been completedPreliminary layout of the Gun Region is underway
Sasha Gilevich04/29/2004
Lasers Overview
26
Drive Laser Overview
Milestones
Issue Request for proposals – June 2004
Review of Proposals – September 2004
Issue Award - October 2004
Completion of R&D – December 2004 (preliminary data – September 2004)
Receive the IR Drive Laser – October 2005
Start Installation – October 2005
Sasha Gilevich
[email protected] Overview
04/29/2004
27
Temporal Pulse Shaping with the Dazzler
Sasha Gilevich
[email protected] Overview
04/29/2004
Preliminary Results Using an Acousto-optic Dispersive Filter For Laser Pulse Shaping
A Ghigo, F. Tazzioli, C.Vicario, S. De Silvestri, M. Nisoli, S. Stagira, I Boscolo, S. Cialdi, L. Serafini
INFN
28
UV to the Cathode