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.................................................................................... 2|24 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 3|24 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 4|24 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 5|24 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. 6|24 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. 7|24 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. 8|24 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. 9|24 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. 10|24 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 11|24 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 12|24 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 13|24 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 14|24 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 15|24 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 16|24 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 17|24 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 18|24 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 19|24 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 20|24 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 21|24 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 22|24 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 23|24 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 24|24