1 Neutron Optics Assembly (NOA) for BEER / ESS : bi-spectral switch assembly (GSW)
The European Spallation Source (ESS) ERIC (European Research Infrastructure Consortium) as joint European project is a large scale, multinational research facility being built in Lund, Sweden, with a data management and software centre in Copenhagen, Denmark.
The European Commission has, by decision (EU) 2015/1478 of 19 August 2015, established ESS as responsible for constructing, operating, developing and decommissioning the Facility.
The Swedish and Danish Governments have agreed to host ESS with Sweden as the host member state in accordance with Regulation (EC) No 723/2009.
The facility will be a world-leading centre for materials research and life sciences using neutrons and will host the world"s most powerful neutron source.
BEER is a time-of-flight engineering diffractometer being built at the ESS.
BEER is intended to enable studies of condensed matter by observing the scattering of thermal or cold neutrons by a specimen.
The unique feature of BEER will be that a large number of short pulses are extracted from the long pulse of the ESS, which is unique after its completion, resulting in significantly higher neutron flux at the sample and thus higher intensity and broader resolution range while providing comprehensive detector coverage.
The Neutron Optical Assemblies (NOA) make part of the beam transport and conditioning system:
The NOA in the common ESS bunker are responsible for the efficient extraction of the neutrons from the cold and thermal ESS moderators as well as their efficient transport through the common ESS bunker.
The neutron optical assemblies shall be installed inside the bunker and the bunker wall, respectively.
In this context Hereon is issuing a tender for
1 pc. neutron optics assembly (NOA): bi-spectral switch (GSW)
The Scope of Work includes all necessary tasks and deliverables for the operation of the NOA as defined in the requirement specification:
I. Preliminary Design
II. Design
III. Production and assembly
IV. Factory acceptance tests (FAT)
V. Delivery to ESS storage facility
VI. Installation and alignment within the common ESS bunker
VII. Site acceptance test (SAT) of the complete
systems at ESS
VIII. Documentation in electronic and paper
copy, including quality assurance
documentation
The GSW neutron optics consists of a stack of about 150 - 180 (exact number depends on the final design of the stack) Si wafers with coating of m=3. The neutron optics shall be moved in and out of the neutron beam by a translational stage. A rotation stage shall allow to position the stack relative to the optical axis. The complete system should be placed in a vacuum vessel which provides sufficient shielding for the assembly.
Minimum dimension of the stack of the Si wafers:
Width (mm) 24.0 x Height (mm) 65.00 x Length (mm) 13.10 - 15.5
Substrate float zone Si-wafers: specific resistivity : ? 5000 Omega*cm
Accuracy of miscut of each single Si-wafer in the Si-wafer stack with respect to the (001)-plane: ? 0.5Grad
Each single Si-wafer thickness 130 - 200 Müm (linked to wafer length: length/thickness = 100)
Out-of-plane Si-wafer roughness ? 3 Å rms
The out-of-plane (=x) waviness of each single Si-wafer ?0.0002 rad rms
Parallelism: maximum angle between the out-of-plane wafer surfaces of each single Si-wafer (averaged over the whole surface). ? 0.0002 rad
Entrance and exit edge roughness of each single Si-wafer ?1Müm rms
Tolerance of positioning of the wafer edges at the entrance and exit side of the Bi-spectral switch from the reference plane in the distance of the outer most wafer edge, oriented parallel to the entrance and exit side. ? 100 Müm
The system interface points (SIP) between the Contractor"s, ESS"s and Hereon"s responsibilities are described in the requirement specification.
Further GSW and project related requirements for this tender regarding (for example, but not limited to:)
- Remuneration
- Declaration of Conformity
- Warranty Period
- Communication during Tender Process
(Alternative solutions, Tender Presentation,
Offer technical Report)
- Product (f.e. General Information, Installation
Context, System Interfaces Points, Definitions,
Functional Requirements, Allowed Materials,
Operation Requirements, Integration, Specific
Requirements, Acceptance Tests, Technical
Documentation)
- Project Management
- Overview of Project Phases
- Quality Assurance and
- Product Documentation
- Contractual Agreements between Hereon and
Subcontractor
are specified in the enclosed documents
"2000084509.1 Agreement Subcontractor" and its Annexes
"2000084509.1 Annex 1" (ESS Standards)
"2000084509.1 Annex 2" (Specification)
"2000084509.1 Annex 3" (Form Monthly Report)
Hereon intends to negotiate with the tenderers the initial and all subsequent tenders submitted, except for the final tenders.
The tenderers have no right to negotiation, Hereon herewith reserves the possibility of awarding the contract on the basis of the initial tenders without negotiation.