Hollow fiber pulse compressors
Table of Content
1. Introduction .............................................................................................................. 3
1.1.
1.2.
1.3.
1.4.
1.5.
Purpose .............................................................................................................. 3
Scope ................................................................................................................. 3
Terms, Definitions and Abbreviations ...................................................................... 3
List of applicable and reference documents .............................................................. 4
System Configuration ........................................................................................... 4
1.5.1. Schematic configuration of the HFPC instrument (Figure 1) .................................. 5
1.6. Input for System Level.......................................................................................... 5
1.6.1. Parameters of the laser system that will be used as an input for HFPC1 and HFPC2 in
E1. ......................................................................................................................... 6
1.6.2. Parameters of the laser system that will be used as an input for HFPC2 in E5. ........ 6
1.7. Output of system level .......................................................................................... 7
1.7.1. Output parameters of the HFPC instrument ........................................................ 7
1.7.2. Planned beamline layout of E1 (figure 2) ........................................................... 8
1.7.3. Planned beamline layout of E5 (figure 3) ........................................................... 9
1.8. External interfaces ............................................................................................. 10
1.8.1. Block diagram of the interfaces between HFPC and E1 (figure 4) ........................ 10
2. Requirements on System Level .................................................................................. 11
2.1. General System Requirements ............................................................................. 11
2.1.1.
2.1.2.
2.1.3.
2.1.4.
2.1.5.
Requirements: Focusing ................................................................................
Requirements: Hollow core fiber .....................................................................
Requirements: Gas-handling system ...............................................................
Requirements: Chirped mirrors ......................................................................
Environmental Conditions ..............................................................................
11
12
12
13
14
2.2. System mechanical and vacuum requirements ....................................................... 14
2.2.1. System Mechanical Design ............................................................................. 14
2.2.2. System Vacuum Pumping Design .................................................................... 14
2.3. System Electrical and Electronics Requirements ..................................................... 15
2.3.1. System Electrical Design ............................................................................... 15
2.3.2. Diagnostics .................................................................................................. 16
2.3.3. Control system and Data Acquisition ............................................................... 16
2.4. System Transportation and Installation Requirements ............................................. 16
2.5. Safety Requirements .......................................................................................... 17
2.5.1. General Safety Requirements ......................................................................... 17
2.5.2. Safety requirements associated with System Functional Requirements ................ 17
2.5.3. Control system safety requirements ................................................................ 17
2.5.4. Gas sources ................................................................................................. 18
3. Quality Requirements ............................................................................................... 19
3.1. Quality control ................................................................................................... 19
3.1.1.
3.1.2.
3.1.3.
3.1.4.
3.1.5.
3.1.6.
3.1.7.
Documentation and data control .....................................................................
Formats for data exchange ............................................................................
Warranties ...................................................................................................
Reliability ....................................................................................................
Maintainability ..............................................................................................
Availability ...................................................................................................
Interchengeability/Replaceability ....................................................................
19
19
20
20
20
20
21
4. System Verification and Validation Requirements ......................................................... 22
4.1.
4.2.
4.3.
4.4.
4.5.
Inspection .........................................................................................................
Review of Design ...............................................................................................
Analysis ............................................................................................................
Test ..................................................................................................................
Functional Demonstration....................................................................................
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22
22
23
23
24
1. Introduction
1.1. Purpose
This Requirements Specification Document (RSD) lists the technical requirements and
constraints for the construction of two hollow fiber pulse compressors for the ELI Beamlines
facility (HFPC1 and HFPC2). These instruments shall have the ability to produce laser
pulses with duration down to the few-cycle regime (< 7 fs FWHM pulse duration) with
energy per pulse on the order of 100s µJ.
Requirements in this document apply to both HFPCs, unless stated otherwise.
1.2. Scope
This RSD contains all of the top level functional, performance, safety, operational, design
and quality requirements for the RA4 systems in experimental halls number 1 (E1) and 5
(E5).
1.3. Terms, Definitions and Abbreviations
For the purposes of this document, the terms and definitions from ECSS-S-ST-00-01 apply (AD
-001). For the purpose of this document, the following abbreviated terms apply:
Abbreviation
Meaning
ELI
Extreme Light Infrastructure
HFPC
Hollow Fiber Pulse Compressor
RSD
Requirement Specification Document
RA4
Research Activity 4
E1 (5)
Experimental area 1 (5)
AMO
Atomic, Molecular and Optical
SRS
Stimulated Raman Scattering
LUX
Laser-driven Undulator X-ray source
HHG
High Harmonic Generation
FWHM
Full Width at Half Maximum
GDD
Group Delay Dispersion
L1
Laser 1 (1 kHz, 100 mJ)
L3
Laser 3 (10 Hz, 1 PW)
R
Review of Design
FD
Functional Demonstration
T
Test
A
Analysis
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I
Inspection
LxWxH
Length x width x height
SI
International System of Units
DAQ
Data Acquisition system
FZU
Institute of Physics, Academy of Sciences of the Czech Republic
1.4. List of applicable and reference documents
Applicable documents – ECSS standards (http://www.ecss.nl/)
Number of
document
AD-01
AD-02
Title of document
ECSS-S-ST-00-01 Glossary of Terms
ECSS-E-ST-10-06C Technical Requirements Specification
1.5. System Configuration
Schematic configuration of each HFPC instrument is shown in figure 1.
REQ-005779/A
Each HFPC shall outlined by the following main parts:




focusing, including beam-pointing stabilization
hollow core fiber
gas-handling system
chirped mirrors compressor
Verification method: R - review, I - inspection
REQ-005768/A
The HFPC1 instrument shall be located in E1 experimental hall at SRS
experimental area.
Verification method: R - review
REQ-005769/A
Output beam of the HFPC2 instrument shall be used as a pump beam for AMO
experiments in E1 experimental hall.
Verification method: R - review
REQ-005770/A
It shall be possible to use the HFPC2 also in experimental hall E5 at LUX
beamline.
Verification method: R - review
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1.5.1. Schematic configuration of the HFPC instrument
(Figure 1)
Figure 1: Schematic configuration of the HFPC instrument. Main components are: F: focusing
lens, HCF: hollow core fiber, GHS: gas handling system, RM: recollimating mirror, W: wedges,
CM: chirped mirrors.
1.6. Input for System Level
The experiments with HFPC1 or HFPC2 at ELI Beamlines facility in experimental hall E1 will
take place with auxiliary beam split from the L1 laser. HFPC2 will also be used in experimental
hall E5 with auxiliary beam split from the L3 laser. Both HFPC systems may also be used with a
different input laser beam.
REQ-005772/A
Design of both HFPC systems shall be compatible with inputs defined in table
1.
Verification method: R - review
REQ-005773/A
Design of HFPC2 shall also be compatible with inputs defined in table 2.
Verification method: R - review
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1.6.1. Parameters of the laser system that will be used
as an input for HFPC1 and HFPC2 in E1.
Pulse duration
(FWHM)
< 30 fs, upgradable to < 20 fs
Energy per pulse
0.5 – 3 mJ
Central wavelength
850 nm
Repetition rate
1 kHz
Beam profile
Gaussian
Beam diameter (1/e2)
17 mm
Polarization
linear horizontal
Table 1: Parameters of the laser system (L1 auxiliary beam) that will be used as an input for
HFPC1 and HFPC2 in E1.
1.6.2. Parameters of the laser system that will be used
as an input for HFPC2 in E5.
Pulse duration (FWHM)
< 30 fs
Energy per pulse
0.5 – 3 mJ
Central wavelength
820 nm
Repetition rate
10 Hz
Polarization
linear horizontal
Table 2: Parameters of the laser system (L3 auxiliary beam) that will be used as an input for HFPC2 in E5.
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1.7. Output of system level
1.7.1. Output parameters of the HFPC instrument
Required output parameters listed in this section apply for HFPC with input beam with
parameters listed in table 1. They are briefly summarized in second column of table 3. Values
in third column in table 3 are for negotiation in the negotiation phase of the tender procedure.
REQ-005774/A
The output pulse duration (FWHM) of the HFPC shall be less than 7 fs.
Verification method: T – test
REQ-005775/A
The energy transmission of the whole HFPC system shall be more than 30%.
Verification method: T – test
REQ-005776/A
The energy of the output pulse shall be in the range of 0.1 – 0.5 mJ
(depending on the input energy).
Verification method: T – test
REQ-005777/A
Spectral bandwidth of the output pulse at 1% level shall be at least 600 – 900
nm.
Verification method: T – test
REQ-005778/A
The output beam diameter (1/e2) shall be less than 13 mm.
Verification method: T – test
1.7.1.1. Output parameters of the HFPC instrument
Parameter
Min. required value
Desired value (for
discussion/negotiation)
Pulse duration (FWHM)
< 7 fs
< 5 fs
Energy transmission
> 30%
> 50%
Energy per pulse
0.1 – 0.5 mJ
>1 mJ
Spectral bandwidth at 1% level
600 – 900 nm
450 – 1150 nm
Table 3: Output parameters of the HFPC instrument.
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1.7.2. Planned beamline layout of E1 (figure 2)
Figure 2: Planned beamline layout of E1. The HFPC1 instrument shall be installed at the SRS
location. HFPC2 shall be installed next to HHG location.
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1.7.3. Planned beamline layout of E5 (figure 3)
Figure 3: North-East sector of the experimental hall E5 with schematic L3 laser distribution
(red) and the LUX beamline. The L3 auxiliary beam for the input of HFPC2 will be extracted
from the mirror in blue circle. The area of the optical table in green circle is reserved for
HFPC2.
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1.8. External interfaces
External interfaces of HFPC in E1 are schematically shown in Figure 4. They include optical
interfaces with L1 auxiliary beam and the user’s end-station. Output of the HFPC will be
diagnosed with local diagnostics that will exchange signals with local control system and DAQ.
External interfaces of HFPC in E5 hall are the same as in E1, except that the input laser beam
will be L3 auxiliary beam.
1.8.1. Block diagram of the interfaces between HFPC
and E1 (figure 4)
Figure 4: Block diagram of the interfaces between HFPC and E1. I5 serves for input into the
HFPC instrument and I6 serves as the output.
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2. Requirements on System Level
2.1. General System Requirements
REQ-003520/A
The system shall be movable between experimental locations.
Verification method: R - review
REQ-003522/A
The height of the optical axis shall be 160 mm (from optical axis to the optical
table).
Verification method: T – test, R - review
REQ-003523/A
The size of the HFPC instrument (excluding gas connections and vacuum
pump connections) shall not exceed 3 m x 1 m x 0.5 m (L x W x H).
Verification method: R - review, T - test
2.1.1. Requirements: Focusing
Requirements on focusing apply for HFPC with input beam with parameters listed in table 1.
When HFPC2 is used with L3 auxiliary beam (with parameters in table 2), focusing will be
performed by ELI-Beamlines.
REQ-003529/A
The laser beam shall be focused with a lens into to the entrance of the hollow
core fiber.
Verification method: R - review
REQ-003530/A
The position of the focal spot shall be actively stabilized to correct for drift in
beam pointing.
Verification method: R - review, T - test
REQ-003531/A
Software for beam-pointing stabilization shall be included in the system.
Verification method: R - review
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2.1.2. Requirements: Hollow core fiber
REQ-003534/A
The hollow core fiber shall be mounted to maintain fiber straightness and
mechanical stability.
Verification method: I – inspection, R - review
REQ-003535/A
The mounts shall be equipped with translation stages for fiber alignment.
Verification method: T – test, R - review
REQ-003536/A
The hollow core fiber shall be mounted in vacuum/gas chamber(s) to allow
filling the fiber with a gas or evacuating the fiber.
Verification method: T – test, R - review
REQ-003537/A
The chamber at the fiber input shall be equipped with a viewing window to
observe entrance of the hollow core fiber.
Verification method: I – inspection, R - review
2.1.3. Requirements: Gas-handling system
REQ-003538/A
The gas-handling system shall enable using inert gas in the hollow core fiber.
Verification method: I – inspection, R - review
REQ-003539/A
The gas-handling system shall allow filling the fiber with gas at constant
pressure.
Verification method: T – test, R - review
REQ-003540/A
It shall be possible to evacuate the hollow core fiber to pressure lower than 1
mbar.
Verification method: T – test, R - review
REQ-003541/A
The gas-handling system shall allow operation with pressure gradient of at
least 0.5 bar along the entire length of the fiber.
Verification method: T - test
REQ-003544/A
The roughing pump shall be included in the system.
Verification method: I – inspection, R - review
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REQ-003545/A
The pressure gauge shall be included in the system.
Verification method: I – inspection, R - review
2.1.4. Requirements: Chirped mirrors
REQ-003546/A
The beam out of the hollow core fiber shall be recollimated and sent to
chirped mirrors.
Verification method: R - review
REQ-003547/A
Optics after the fiber shall be 1 inch diameter or equivalent (for rectangular
optics).
Verification method: R - review
REQ-003548/A
Chirped mirrors shall be mounted on a breadboard.
Verification method: I – inspection, R - review
REQ-003551/A
The bandwidth of chirped mirrors shall support pulse duration <7 fs.
Verification method: T – test
REQ-003552/A
The bounces of chirped mirrors shall compensate GDD in the hollow core
fiber, windows and air-path in the system, and besides pre-compensate for
additional GDD in the range at least 0 – 200 fs2.
Verification method: R - review
REQ-003553/A
The number of bounces of chirped mirrors shall be adjustable to change the
GDD pre-compensation in the range at least 0 – 200 fs2.
Verification method: R – review
REQ-003554/A
The system shall include wedges for fine tuning of GDD in the range at least 0
– 200 fs2.
Verification method: I – inspection, R - review
REQ-003556/A
Insertion of wedges shall be motorized.
Verification method: I – inspection, R - review
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2.1.5. Environmental Conditions
REQ-003557/A
The HFPC instrument shall fulfil ISO 7 cleanliness condition (10,000 dust
particles per cubic meter).
Verification method: I - inspection
REQ-003558/A
The HFPC instrument shall be fitting to be operated at humidity level within an
interval from 40% to 60%.
Verification method: T – test
REQ-003559/A
The HFPC instrument shall be fitting to be operated at temperature of
(20.0±2.0)°C with a long-term stability.
Verification method: T – test
2.2. System mechanical and vacuum requirements
2.2.1. System Mechanical Design
REQ-003563/A
System components shall be produced to be operated, used and maintained
with standard tools using metric system.
Verification method: R - review
2.2.2. System Vacuum Pumping Design
REQ-003564/A
The hollow core fiber shall reach pressure below 1 mbar with a roughing
pump.
Verification method: T – test, R - review
REQ-003565/A
The vacuum components shall be compatible with ISO-K, ISO-F and ISO-KF
standards. (NORMS: ISO 1609:1986 - Vacuum technology - Flange
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dimension; ISO 2861:2013 - Vacuum technology - Dimensions of clamped type quick-release couplings).
Verification method: R - review
REQ-005890/A
Pumping speed of the vacuum pump shall be at least 4m 3/hour.
Verification method: R - review
REQ-005891/A
Ultimate pressure of the vacuum pump shall be lower than 10-1 mbar.
Verification method: R - review
REQ-005892/A
The vacuum pump shall be oil free (dry pumping).
Verification method: R - review
REQ-005893/A
The vacuum pump shall be equipped by control and power unit.
Verification method: R - review, I - inspection
REQ-005894/A
The vacuum pump shall be air cooled.
Verification method: R - review, I - inspection
REQ-005895/A
The vacuum pump shall be equipped by gas ballast.
Verification method: R - review, I - inspection
REQ-005896/A
Maximum noise level shall be lower than 60 dB.
Verification method: R - review
2.3. System Electrical and Electronics Requirements
2.3.1. System Electrical Design
REQ-003566/A
System shall be designed according the valid Czech and European norms.
Verification method: R - review
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2.3.2. Diagnostics
REQ-003568/A
Output from pressure gauge shall be expressed in one of these units: bar,
torr, pascal or atmosphere.
Verification method: R - review
2.3.3. Control system and Data Acquisition
REQ-003569/A
Beam pointing into the entrance of the hollow core fiber and motion of the
wedges shall be controlled through a local control system.
Verification method: R – review
REQ-003570/A
Characteristics of the output beam (pulse duration, spectrum, power, beam
profile ...) shall be measurable with local diagnostics (which is not part of the
HFPC instrument).
Verification method: R - review, T - test
2.4. System Transportation and Installation Requirements
REQ-003572/A
All components shall be clean according the ISO 7 standard prior to the
installation in the E1 hall.
Verification method: I - inspection
REQ-003573/A
Individual components shall be transportable in boxes with dimensions not
exceeding 2m x 1m x 1m (L x W x H).
Verification method: R - review
REQ-003574/A
The system shall be delivered with the installation manual.
Verification method: I - inspection
REQ-005780/A
The supplier shall provide a system transportation procedure for customer
approval.
Verification method: R - review
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2.5. Safety Requirements
2.5.1. General Safety Requirements
REQ-003575/A
System or its relevant components shall comply with all applicable EU and
Czech legislative requirements and where applicable shall have CE marking
and Certificate of Compliance.
Verification method: A - analysis
REQ-003576/A
Supplier shall participate in the ELI Beamlines risk assessment for the normal
mode(s) of operation.
Verification method: R - review
2.5.2. Safety requirements associated with System
Functional Requirements
REQ-003577/A
Supplier shall provide a recommended procedure for laser beam alignment to
the HFPC instrument.
Verification method: R - review
REQ-003578/A
Supplier shall provide a recommended procedure for adjusting gas pressure
and changing gas species in the hollow core fiber.
Verification method: R - review
REQ-003579/A
Supplier shall provide a recommended procedure for instrument operation and
maintenance.
Verification method: R - review
2.5.3. Control system safety requirements
REQ-003580/A
All supplied motors shall be equipped with encoders and/or limit-switches.
Verification method: R – review, FD - functional demonstration
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2.5.4. Gas sources
REQ-003581/A
The gas piping shall be designed to enable safe handling of inert gases.
Verification method: R - review
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3. Quality Requirements
3.1. Quality control
3.1.1. Documentation and data control
REQ-003583/A
Supplier shall supply following relevant manufacturing documents (extent as
stipulated in contract): Operating manual (including step-by-step alignment
procedure), maintenance manual.
Verification method: I - inspection
REQ-003584/A
Documentation shall be supplied in all following formats: hardcopy and PDF.
Verification method: I - inspection
3.1.2. Formats for data exchange
REQ-005520/A
The supplier shall provide following type of documents:
- 3D model (if available)
- 2D drawings
- Printable format for text documents
Verification method: I - inspection
REQ-005521/A
Formal communication between supplier and ELI shall be in the following
formats:
 *.JPG
 *.PDF A
 CAD 2D: *.dwg
 CAD 3D: STEP type files (*.stp;*.ste;*.step)
 text processors *.doc, *.docx, OpenDocument Format
 spreadsheet processors *.xls, *.xlsx, OpenDocument
Format
 presentations *.ppt, *.pptx; OpenDocument Format
 *.HTML
Verification method: I - inspection
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3.1.3. Warranties
REQ-003582/A
Supplier shall include applicable warranty and support policies as part of the
response to the tender.
Verification method: I - inspection
3.1.4. Reliability
REQ-003585/A
Mean number of adjustment cycles between failures of the HFPC instrument
shall be more than 60. Suppliers that can demonstrate a high level of
reliability based on previous delivery of HFPC (or experience/work with HFPC)
will be prioritized.
Verification method: A - analysis
3.1.5. Maintainability
REQ-003586/A
Supplier shall identify less reliable parts and take measures to make these
easily exchangeable.
Verification method: A – analysis, R - review
REQ-003587/A
Time to replace a less reliable part shall not exceed 3 hours.
Verification method: FD - functional demonstration
3.1.6. Availability
REQ-003588/A
The HFPC system shall be constructed in such a way that if properly
maintained and staffed, the instrument can be expected to be brought up to
operation within two hours.
Verification method: A – analysis, R - review
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3.1.7. Interchengeability/Replaceability
REQ-003589/A
All main elements of the HFPC instrument shall be designed to be easily
interchanged or replaced.
Verification method: R - review
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4. System Verification and Validation Requirements
The requirements are presented with the following structure: First the requirement is given.
Each requirement definition shall contain a verification method by which requirement will be
verified. Verification methods are following: inspection (I), review of design (RoD), analysis
(A), test (T) or functional demonstration (FD).
4.1. Inspection
REQ-005497/A
Verification by inspection shall consist of visual determination of physical
characteristics.
NOTE Physical characteristics include constructional features, hardware
conformance to document drawing or workmanship requirements, physical
conditions, software source code conformance with coding standards.
Verification method: R – review
REQ-005498/A
The list of accomplished requirements and their physical location and
presence, and the list of unaccomplished and incomplete requirements shall
be made.
Verification method: R - review
REQ-005499/A
The results of inspection shall be documented in approved record.
Verification method: R - review
4.2. Review of Design
REQ-005500/A
Verification via review shall be the comparison of the relevant documentation
which was required with the delivered documentation (e.g. technical, design,
safety documentation, operational, maintenance manuals, etc.).
Verification method: R - review
REQ-005501/A
The list of accomplished requirements and the list of unaccomplished and
incomplete requirements shall be made.
Verification method: R - review
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REQ-005502/A
The results of review shall be documented in approved record.
Verification method: R - review
4.3. Analysis
REQ-005503/A
Verification via analysis shall be to do a calculation process (calculation,
simulation, numerical models, etc.) where the calculation results shall be
documented together with further qualified recommendation of the following
steps.
Verification method: R - review
REQ-005504/A
The list of accomplished requirements with the calculation results and output
parameters and the list of unaccomplished and incomplete requirement with
the note of the missing input and reason of calculation failure shall be made.
Verification method: R - review
REQ-005505/A
The results of calculation shall be documented in approved record.
Verification method: R - review
4.4. Test
REQ-005506/A
Verification via test shall be to test a measurable parameter.
Verification method: R - review
REQ-005507/A
The protocol of the measurement shall be made and approved.
Verification method: R - review
REQ-005508/A
The list of accomplished requirements with the note of measured value and
the list of unaccomplished and incomplete requirement shall be made.
Verification method: R - review
REQ-005509/A
The test plan shall be defined including all requirements where is applied test
as the verification method.
Verification method: R - review
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REQ-005510/A
Test plan shall be approved by the Customer.
Verification method: R - review
4.5. Functional Demonstration
REQ-005511/A
Verification via functional demonstration shall be to test the system’s
response to a subject of requirement and check if its response is within the
limits of the requirement.
Verification method: R - review
REQ-005512/A
The protocol of functional demonstration shall be made and approved.
Verification method: R - review
REQ-005513/A
The list of accomplished requirements and the list of unaccomplished and
incomplete requirements shall be made.
Verification method: R - review
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