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Omega Volume VII-System Description, Руководство по эксплуатации

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S-AD-M-005
Chapter 1:  System Overview

January 2006—Page 15 of 35

Figure 1.5 
Schematic diagram of the Laser Sources subsystem design for sources 1 and 2. These sources support both short-pulse (1 to 
100 ps) and long-pulse (1 to 10 ns) operation. The “green” coloration from the CLARA SHG indicates  2

~

. Beamlines 3 

and 4 do not have short-pulse capability and therefore have a different configuration.

Figure 1.6 
Block diagram of the Laser Sources Beamlines 3 and 4. These sources do not have short-pulse capability. Pulse lengths 
and shaping between 1 and 10 ns are provided. The regen in these systems limits the pulse width.

signal and idler frequencies equals the pump frequency for each temporal portion of the pulse. Optical 
parametric amplification is essentially the reverse of sum-frequency mixing, where two lower frequencies 
combine to form a higher frequency as in the frequency-conversion crystals, and is described by the 
same equations. OPCPA is a special case of optical parametric amplification where the signal beam is 
frequency chirped.

The OPCPA pump laser starts with the same components as the long-pulse beam up to and 

including the spatial shaping stage. It also includes a high-repetition-rate (5-Hz) crystal large aperture 
ring amplifier (CLARA) that amplifies the shaped IR pulse to ~3 J/pulse and a second harmonic generator 
(SHG) that produces ~2-J 2

~

 pulses that are square in space and time. The signal emerging from the 

OPCPA stage is further amplified using the same 15-cm Nd:glass amplifier that is used in long-pulse 

G6862J1

Short-pulse

oscillator

Stretcher

OPCPA

stage 2

OPCPA output

spatial filter

Short pulse

apodizer

Apodizer output 

spatial filter

Long-pulse

beam shaper

Long-pulse

preamplifier

Phase

modulator

Long-pulse

apodizer

Regen

CLARA 

Beamline

injection

Periscope to

Laser Bay

Discrete zoom

spatial filter

Isolation

stage

15-cm glass

amplifier

OPCPA

stage 1

Second harmonic

generator (SHG)

Aperture coupled

strip line (ACSL)

Integrated front end

source (IFES)

Short-Pulse Generation Chain

Long-Pulse Generation Chain

G6863J1

Beam

shaper

Phase

modulator

Apodizer

Regen

Integrated front end

source (IFES)

Beamline

injection

Periscope

to Laser Bay

Discrete zoom

spatial filter

Isolation

stage

Power

amplifier

Aperture-coupled

strip line (ACSL)

Содержание Volume VII-System Description

Страница 1: ...m 6 1 1 3 2 1 Intensity Scaling of Hot Electron Energy 6 1 1 3 2 2 Electron Beam Transport 6 1 1 4 SSP Related High Energy Density Physics 6 1 1 4 1 Equation of State Measurements of Materials 7 1 1 4...

Страница 2: ...Structure 23 1 6 Timing Systems 24 1 7 Optical Alignment 26 1 8 Laser Diagnostics 29 1 8 1 Infrared Diagnostic Package IRDP 29 1 8 2 Short Pulse Diagnostics Package SPDP 29 1 8 3 Ultraviolet Diagnosti...

Страница 3: ...irected into the OMEGA EP chamber with each beam capable of being operated in long pulse UV mode with independent temporal pulse shapes and pulse widths up to 10 ns It is also possible to send two com...

Страница 4: ...nsity laser target interactions of the target improves with increased electrical conductivity No experiment to date has a target with conductivity within an order of magnitude of that of a DT plasma F...

Страница 5: ...ts at 48 relative to the hohlraum axis allow the beams to be incident at an optimum angle for coupling to the hohlraum walls The 48 beam cone and options such as frequency converting the beams to 2 pr...

Страница 6: ...hting with conventional OMEGA and NIF beams It will allow dedicated backlighting beams in both the OMEGA and OMEGA EP target chambers The short pulse capability of illuminating targets at 1020 W cm2 a...

Страница 7: ...e full NIF but more than OMEGA possible and may relax requirements on efficiency and drive symmetry Fast ignition can also be used with drivers such as ion beam or Z pinch radiation sources that can c...

Страница 8: ...on density nc contour for 1 nm light has a 430 nm radius while the 10 nc contour has a 150 nm radius From this approximate characterization of the radial density profile it is clear that the propagati...

Страница 9: ...en unknown The OMEGA EP system will significantly extend the range of conditions and materials that can be tested with OMEGA because of the higher laser driver energy and the increased number of shots...

Страница 10: ...on of 10 ps minimizes the hydrodynamic expansion of the sample and makes the heating close to isochoric It will be possible to study the opacities of warm dense matter using diagnostic techniques such...

Страница 11: ...ne story high 14 ft concrete box beam which serves as a rigid optical table The first and second floors of the structure serve as the optical table and are 30 in thick concrete slabs The lower floor r...

Страница 12: ...ed using optical parametric chirped pulse amplification OPCPA The injected pulse passes through the booster amplifier and is reflected off the fold mirror to the polarizer POL1 and into the main ampli...

Страница 13: ...port H7 where an off axis f 1 8 parabolic mirror focuses them onto the target The focal spot can be shifted to any location within 1 cm of the center of the chamber to provide for flexible backlighti...

Страница 14: ...mance limited by the damage threshold of the multilayer dielectric reflection gratings The use of improved grating technology provides up to 2 6 kJ of laser energy per beam The pulse width of Beam 2 w...

Страница 15: ...ively assumed to be 85 The calculations used for Table 1 3 assume low risk existing technologies and demonstrated UV damage fluences for optical coatings In spite of the de rating of OMEGA EP energies...

Страница 16: ...mplifier This OPCPA stage is critical to the performance of the short pulse beams Attractive features of OPCPA include a broad gain bandwidth high gain in a short optical path and reduced amplified sp...

Страница 17: ...cy chirped The OPCPA pump laser starts with the same components as the long pulse beam up to and including the spatial shaping stage It also includes a high repetition rate 5 Hz crystal large aperture...

Страница 18: ...modulator The pulse is further amplified in a glass amplifier before injection into the transport spatial filter of the beamlines The optical image plane of the LP apodizer is relayed throughout the...

Страница 19: ...a diagnostic beamsplitter mirror DBS to provide a path to beam diagnostics and alignment packages In both the cavity and transport spatial filters the beam passes through a different pinhole on each p...

Страница 20: ...in Fig 1 7 For short pulse experiments Beam 1 or Beam 2 may be routed to the upper or lower compressor in the GCC where four matched MLD tiled grating assemblies temporally compress the pulse A defor...

Страница 21: ...pper compressor Lower compressor GCC VW DM DM BC Beamline 1 Beamline 2 Beamline 3 Beamline 4 From transport spatial filters FCC s 2 3 b e a m 4 8 b e a m Short pulse IR path default configuration To O...

Страница 22: ...roduced just before the FCC s with the periscope mirror assembly PMA The placement of the FCC s before the target chamber rather than on the target chamber as in the NIF permits more convenient beam d...

Страница 23: ...ure 1 9 Illustration of the inner workings of the GCC shows the locations of the TGA s G1 to G4 and the target chamber selection mirror The upper and lower compressors for Beams 1 and 2 are aligned at...

Страница 24: ...ation of the upper compressor s optical path including the deformable mirror beam combiner and target chamber selection mirror The diagnostic mirror provides a 1 pickoff for the short pulse diagnostic...

Страница 25: ...d in the SPDP table 1 5 3 Target Chamber and Target Area Structure The OMEGA EP target chamber is similar in design to the OMEGA target chamber and has the same 3 3 m diameter The chamber is located w...

Страница 26: ...video cameras to capture the laser pulses 2 trigger signals for the electro optical devices that select and shape optical pulses in the laser portion of the system 3 trigger signals for the power cond...

Страница 27: ...Shot Executive Shot Director OMEGA Power Conditioning Executive OMEGA EP Power Conditioning Executive Trigger generator selector TG S Reference frequency generator RFG 38 MHz Master timing generator...

Страница 28: ...nchronized with each other In the independent mode each system functions as if it had an independent dedicated timing system In the joint mode the critical shot triggers originate from a single source...

Страница 29: ...ssor to the short pulse diagnostic package SPDP table completing an alignment handoff with the SPDP ASP The SPDP also contains an alignment laser 1053 and 1047 nm that can be propagated through either...

Страница 30: ...the tiles in each tiled grating assembly for each pulse compressor Insertable CAM s located before TGA1 between TGA s 2 and 3 and after TGA4 support alignment of the TGA s A two wavelength Littrow ali...

Страница 31: ...tics suite comprised of at least ten individual diagnostic instruments These instruments diagnose the properties of the beams before they are co aligned and exit the GCC The SPDP provides information...

Страница 32: ...ror During the alignment process a sample of the alignment beam is directed to the alignment sensor On a shot the 4 sample of the high energy pulse is directed to beam performance diagnostics on the U...

Страница 33: ...ann wavefront sensors PEPC grating alignment and a new higher precision timing system etc The Control System architecture has been modified to reflect OMEGA EP as a subservient system to OMEGA when in...

Страница 34: ...ds to prepare for the shot When a subsystem has been readied the operator signals the SD using a checklist button on the executive GUI The SD then reviews key details of the setup with the operator be...

Страница 35: ...osed access areas during shot operations for safety reasons and to define the staffing requirements The specifics are defined in LFORM referenced above Like OMEGA there are seven shot types used for O...

Страница 36: ...nto TSF Viewing Gallery Capacitor Bays Laser Target Bay 5 Charging driver and beam line heads Propagation to beyond stage A Terminates at F ASP s Amplified source injected into TSF Glass amplifier pum...

Страница 37: ...EGA Operations page of the LLE Web site This interface consists of a series of pages or screens called forms that collect information of various types The SRF pages for OMEGA EP include General laser...

Страница 38: ......

Страница 39: ...fast ignitor FOA final optical assembly fs femtosecond FWHM full width at half maximum GCC grating compression chamber GUI graphical user interface HED high energy density HEPW high energy petawatt H...

Страница 40: ...erence frequency generator RRM rate regenerator module SAC scanning autocorrelator SD Shot Director SE Shot Executive SHG second harmonic generation SP short pulse SPDP short pulse diagnostic package...

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