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EDMS No.: XXXXX DO-XXXXXXXX

MQ/MQYY anti-cryostat

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Technical Specification for the anti-cryostats for MQ and MQYY superconducting magnets

AbstractThis technical specification concerns the supply of two pairs of anti-cryostat to be used in the STAARQ test station at CEA Saclay to perform magnetic measurement of MQ and MQYY magnets destined to be used at CERN. After a short description of the parts, the scope of the supply, the technical contract management, the technical requirements, the quality assurance, the measurements and the delivery conditions are given. Delivery of the supply is required 40 weeks after placement of the contract.

November 2019

EDMS No.: XXXXXX 1DO-XXXXXXXX

Table of Contents

1. INTRODUCTION:...........................................................................................................................21.1. Introduction to CERN.........................................................................................................................21.2. Introduction to CEA/IRFU.................................................................................................................31.3. STAARQ project and introduction to MQ and MQYY magnet........................................................32. SCOPE OF THE SUPPLY:.............................................................................................................52.1. Deliverables included in the supply....................................................................................................62.2. Activities at the contractor’s premises and subcontracted..................................................................63. TECHNICAL REQUIREMENTS:.................................................................................................63.1. General description.............................................................................................................................63.2. In-between the 2 concentric tubes......................................................................................................93.3. Instrumentation, Multi-Layer Insulation and hold point..................................................................113.4. Manufacturing and tooling...............................................................................................................123.4.1. Dimension and tolerances................................................................................................................123.4.2. Magnetic permeability of stainless steel components......................................................................123.4.3. Manufacturing and cleaning procedures.........................................................................................123.5. Safety design requirements...............................................................................................................123.6. Documentation handling, Quality Control and quality assurance....................................................124. PERFORMANCE OF THE CONTRACT:.................................................................................134.1. Delivery schedule.............................................................................................................................134.2. Tests carried out at the contractor’s premises...................................................................................134.2.1. Test, controls....................................................................................................................................134.2.2. Non-conformities..............................................................................................................................144.3. Contract follow-Up and Progress Monitoring..................................................................................144.4. Packing and Shipping.......................................................................................................................144.5. Provisional Delivery Schedule.........................................................................................................145. CERN/CEA SACLAY CONTACT PERSONS...........................................................................14

2 EDMS No: XXXXXXDO-XXXXXXXX

1. INTRODUCTION:

1.1. Introduction to CERN

CERN, the European Organization for Nuclear Research, is an intergovernmental organization with over 20 Member States. Its seat is in Geneva but its premises are located on both sides of the French-Swiss border (http://cern.ch/fplinks/map.html). CERN’s mission is to enable international collaboration in the field of high-energy particle physics research and to this end it designs, builds and operates particle accelerators and the associated experimental areas. At present more than 11 000 scientific users from research institutes all over the world are using CERN’s installations for their experiments. The accelerator complex at CERN is a succession of machines with increasingly higher energies. Each machine injects the beam into the next one, which takes over to bring the beam to an even higher energy, and so on. The flagship of this complex is the Large Hadron Collider (LHC) as presented below:

Figure 1: CERN accelerator Complex

Further information is available on the CERN website: http://cern.ch

http://cern.ch/


1.2. Introduction to CEA/IRFU

IRFU, Institute of Research into the Fundamental Laws of the Universe, is a French research institute of the Commissariat à l’Energie Atomique et aux énergies alternatives (CEA) dedicated to astrophysics, nuclear physics, and particle physics. Among other things, IRFU is making major contribution to magnets and accelerators community. The Accelerators, Cryogenics and Magnetism Department (DACM) is part of the IRFU and has as mission to carry out, with the national and international community, research and development in the fields of particle accelerators, cryogenic systems and superconducting magnets for use in fundamental research. The Systems Engineering Department (SIS) is part of the IRFU as well and merges the fields of mechanical engineering and those of general instrumentation, necessary to the specific developments of the experimental equipment for applications in the field of fundamental physics research. DACM and SIS are working together on many large projects.

1.3. STAARQ project and introduction to MQ and MQYY magnet

The objective of the STAARQ project is to design and build a cryogenic station to test superconducting magnets in a 1.9 K pressurized superfluid helium bath. This station will be used, in particular, to test the MQ and MQYY magnets intended for CERN as part of the HiLumi project. Indeed, as part of the tests carried out by the CERN/CEA collaboration (under the CMA+ agreement), CEA is in charge of testing two prototype MQYY superconducting magnets and six MQ superconducting magnets. The main characteristics of these magnets are as follows:

MQYY: o Outer diameter: 614 mmo Max. physical length: 4.035 mo Double aperture magnet with a diameter of 90 mm per apertureo Distance between axis: 194 mmo Max. current: 6 kAo Weight: 8,970 kg

MQ:o Outer diameter: 452 mmo Max. physical length: 3.45 mo Double aperture magnet with a diameter of 56 mm per apertureo Distance between axis: 194 mmo Max. current: 13 kAo Weight: 4,060 kg

As part of this project, magnetic measurements will be carried out on MQ and MQYY magnets. To do these magnetic measurements, the test station cryostat will be equipped with anti-cryostat in which will be introduce a rotating probe which must be in an atmosphere at room temperature. These anti-cryostat are going from the top flange of the cryostat all the way to the bottom of the magnets through their apertures. Since the MQ magnet has a double aperture of 56 mm and the MQYY has a double aperture of 90 mm, 2 pairs of anti-cryostat are needed because their dimensions are not the same. Figure 2 presents a scheme of the cryostat with its anti-cryostat and figures 3 and 4 present the cryostat without the vessel. It can be seen the anti-cryostat in the middle going from the top flange all the way to the bottom through the apertures of the magnet.


Figure 2 – scheme of the Cryostat


Figure 3 – Overview of the cryostat with the magnet, the anti-cryostat and without the vessel

Figure 4 – Close-up of the Cryostat without the vessel

2. SCOPE OF THE SUPPLY:

This Invitation to Tender concerns the anti-cryostat for the MQ and for the MQYY magnetic measurements. CERN intends to adjudicate the supply of these components to one successful bidder, hereafter referred to as the “Contractor”. The assembly drawings 71 S051 DM- 1500 000 show the various components required to build the anti-cryostats. A summary of the supply with the drawings numbers and the designation are shown in table 1 below:


Table 1: Summary of the anti-cryostat components

2.1. Deliverables included in the supply

The supply shall include: The manufacturing of all the parts listed before Dimensional checks of the fabricated parts and issuance of conformity certificates for each

set Safe packing and shipping of the sets.

2.2. Activities at the contractor’s premises and subcontracted

The contractor shall perform the following activities: Machining of the supply’s components First assembly of the supply’s components Leak tests (see §4.2) Dimensional control of the supply’s components Packing, and shipping of the supply.

The work performed at the contractor premises and subcontracted shall be specified in the offer.

3. TECHNICAL REQUIREMENTS:

3.1. General description

The contractor is responsible for the manufacture of two pair of anti-cryostat for MQ and MQYY magnet. The two types of anti-cryostat have the same design and the difference are the dimensions to fit with the 2 type of magnets considered. The general design of the anti-cryostat is described in this paragraph.


Figure 5 presents a pair of anti-cryostat mounted on an Iso K DN 400 flange itself fixed on the top flange of the cryostat. The most important point to take into account is the fact that the external part of the anti-cryostat passes through a bath of liquid helium at 4.5 K above the Lambda plate and through a bath of superfluid helium at 1.9 K below the Lambda plate which means that the exterior of the anti-cryostat are at cryogenic temperature. On the other hand, to perform magnetic measurements, a rotating probe goes down from the top inside the anti-cryostat and it must be in an atmosphere at room temperature. To do so, the main body of the anti-cryostat is made of 2 concentric cylinders: the external one is at cryogenic temperature while the interior is kept at room temperature using heaters and a flow of helium gas. Between these 2 cylinders, vacuum is done and Multi Layers Insulations (MLI) is wrapped around the inside cylinder to thermally insulate the outside and the inside of the anti-cryostat.Figure 6 presents the top of the anti-cryostat. The anti-cryostat are hold on the Iso K DN 400 top flange with an Iso K DN 160 and, once the rotating coil is set inside the anti-cryostat, a bell is mounted on the top of the anti-cryostat with an Iso F DN 100 in order to close the anti-cryostat’s inside volume and to guide the rotating axis of the probe. Between these 2 DN comes out several ports: one is used to blow gas helium in a pipe which passes between the 2 concentric cylinders, one is used to do vacuum between the 2 cylinders, one is used to pass the wires necessary for the heaters and the temperature sensors located between the 2 concentric cylinders.Figure 7 presents a top perspective of one anti-cryostat mounted on the DN 400 flange. It can be seen below the DN 400 flange a below needed to have flexibility and compensate thermal contraction. Figure 8 presents a view of the anti-cryostat at the Lambda plate level (the Lambda plate is made of G-10 and separates the normal and superfluid helium bath). The external diameter of the anti-cryostat is not the same above and below the Lambda plate, the diameter below the Lambda plate being driven by the magnet aperture. Below the conical piece is a bellow to give flexibility and compensate thermal contraction. Below this bellow is the long part of the anti-cryostat immersed in superfluid helium and passing all along the aperture of the magnet.


Figure 5 – pair of anti-cryostat

Figure 6 – top of the anti-cryostat


Figure 7 – top perspective of the anti-cryostat (only one anti-cryostat) mounted on a Iso K DN 400 flange

Figure 8 – anti-cryostat at Lambda plate level

3.2. In-between the 2 concentric tubes

For the internal tube, there is a bellow above the Lambda plate level (see figure 9) to give flexibility and compensate the thermal contraction. To maintain the 2 tubes concentric, spacers (see figure 10) are placed almost every meter. These spacers are made of G-10 and have been designed to minimize as much as possible the heat exchange between the 2 tubes: the external tube is around 2 K and the internal tube is at room temperature. Also, between the 2 tubes, there is a small pipe with an external diameter of 2 mm and an internal diameter of 1.5 mm going from the top of the anti-cryostat to the bottom with a connection to the internal tube in which the gas helium flows (see figure 12).


Figure 9 – cut view of the inside bellow above the Lambda plate level

Figure 10 – internal/external tube spacer


Figure 11 – spacer on internal tube and helium gas feeding tube

Figure 12 – anti-cryostat bottom section view with the gas helium tube

3.3. Instrumentation, Multi-Layer Insulation and hold point

For the good operation of magnetic measurement, the inside of the internal tube must be kept at room temperature. To do so, first, as already seen, there will be a mass flow of gas helium inside the internal tube and this flow is sent to the bottom of the anti-cryostat through the capillary tube which is between the 2 cylinders. To have a better control of the temperature, 3 heaters and 4 temperature sensors will be installed between the 2 tubes and distributed all along the length of the anti-cryostat. The heaters will be glued to the exterior of the internal tube and 4 temperature sensors will be installed on the exterior of the internal tube to measure its temperature. Once the heaters and the temperature sensors would be installed, MLI will be wrapped around the exterior of the internal tube to thermally insulate the internal tube which must be around room temperature from the external tube which is at cryogenic temperature.


This part of the manufacturing is a hold point: the installation of the heaters and of the temperature sensors as well as the MLI wrapping will be performed by CEA Saclay representatives at the contractor premise. This means that the contractor must manufacture and prepare all the parts of the anti-cryostats but he must wait before inserting the inner tube in the outer tube that the CEA Saclay representatives have handed in installing the heaters, the temperature sensors and the MLI.

3.4. Manufacturing and tooling

The contractor shall have available all the necessary tooling for the proper execution of the contract.

3.4.1. Dimension and tolerancesThe technical drawings currently submitted with the technical specification are “for tender”. After award of the contract, parts shall be compliant with the “for fabrication” version of the drawings. No exception will be accepted regarding the tolerances. Particular attention should be paid to the ISO tolerance zones.

3.4.2. Magnetic permeability of stainless steel componentsAll 304 L stainless steel components must have a relative permeability inferior to 1.05 as well as the different welding.

3.4.3. Manufacturing and cleaning proceduresThe manufacturing process and cleaning procedures used by the contractor is up to the Contractor and shall be proposed in the offer.

3.5. Safety design requirements

The supply shall comply with CERN safety rules (available at the link: http://cern.ch/safety-rules) and the Swiss and/or French and European legislation.

3.6. Documentation handling, Quality Control and quality assurance

The Contractor’s Quality Assurance Plan shall provide for manufacturing planning, material and process control, inspection and testing, non-conformance control and objective evidence (documentation) of the inspection function. In addition to the requirements of § 3, the contractor may propose any internationally recognised design standard, subject to prior written approval by CERN and CEA Saclay. CERN and CEA Saclay reserve the right to veto the use of certain codes or norms if it is considered that their application will not ensure compliance with this technical specification. All documents produced by the contractor shall be submit in electronic format:

Drawings in CATIA®, AUTOCAD® and/or HP-GL® format Text documents in Microsoft Word® and PDF® format Cost breakdowns, schedule and equipment lists in Microsoft Excel® format

The contractor shall comply with professional and/or CERN’s standards/codes in matters of document editing, design/drawing process, design reviews and approval, naming conventions and tagging, quality assurance/control.


4. PERFORMANCE OF THE CONTRACT:

Unless specifically mentioned otherwise, the contractor shall apply the most restrictive clause in case of ambiguity between the clauses of the contract, including its annexes. All deliverables and activities that are not explicitly mentioned in the technical specification but are essential for the execution of the contract shall be considered an integral part of the technical specification and therefore subject to clause 3.1 of General Conditions of CERN Contracts.

4.1. Delivery schedule

Once the contractor is notified of the award of the contract, he shall deliver the supply according to the following delivery schedule:

Procurement of raw materials within 20 weeks after the award of the contract Machining of all listed items within 8 weeks after the procurement of materials First part of assembling (before hold point) within 3weeks after machining of parts Hold point: intervention of CEA Saclay. CEA Saclay must be informed that the contractor

reaches the hold point when first part of assembling is done. CEA Saclay needs 3 weeks to install the heaters, temperature sensors and MLI.

Final part of assembling (after hold point) within 3 weeks after CEA Saclay intervention Acceptance tests at factory within 2 weeks after final part of assembly Delivery of the anti-cryostats within 20 weeks after availability of the raw material

4.2. Tests carried out at the contractor’s premises

4.2.1. Test, controlsInspections and tests shall be performed in accordance with approved procedures; such procedures shall include reference criteria for acceptance or rejection and shall include the following controls:

Conformity check of the materials certificates; Dimensional controls of all the components with careful measurements of the inner tube and

outer tube internal and external diameters and thickness; A global helium-tight test will be carried out by certified COFREND operators with a mass

spectrometer to be calibrated and calibrated before and after the test. The control reports of all helium-tightness tests will be included in the report. Vacuum seals will be tested with helium. The local leakage rate by solder for these helium leakage tests will be less than 3*10-8 mbar.l/s.

Two leak tests must be performed: one for the volume inside the internal tube and the capillary tube and one for the volume between the 2 tubes. These tests must be performed after thermal choc with liquid nitrogen.

Adequate records shall be maintained of all inspection or test results (accepted or rejected) and identification of the inspection or test personnel the final control will be performed at the temperature of 20 ° C. The minutes of the control will highlight all dimensions with their measured values and their deviations from the required tolerances. Inspection and testing shall be performed using properly calibrated measuring and test equipment. The Contractor’s Quality Assurance Plan shall describe a system which provides for:

1) Calibration procedures, including frequency and proper environmental conditions2) Calibration status indicators on measuring and test equipment where physically possible.

General remarks:


A CERN and/or CEA representative has the right to be present for any inspections at all stages of manufacturing and assembly if considered necessary. In case of disagreement, the representative may call for an official external organization

The factory inspection will be paid and executed by the Contractor. CERN will be informed in writing of the date, at least 1 week in advance, and may send a representative to attend.

4.2.2. Non-conformitiesCERN or CEA Saclay will be informed as soon as possible of all non-conformities; these must be traced.

4.3. Contract follow-Up and Progress Monitoring

A system of process sheets, shop travellers, or equivalent means shall be used to define the sequence of manufacturing, inspection, installation and test activities to be performed during the entire manufacturing process. The date of the production shall be communicated to CERN and CEA by the contractor enough in advance to allow the participation of CEA or CERN representative. The contractor shall assign a person responsible for the technical execution of the contract and its follow-up throughout the duration of the contract. A written progress report shall be sent to CERN upon request from the CERN-CEA technical contact until completion of the contract. This report shall include:

Actual progress in comparison to scheduled progress Quality control reports and geometry checks.

4.4. Packing and Shipping

The contractor is in charge and has the responsibility of the packing. The parts must be sent to CEA Saclay with their certificate of conformity (a paper copy to be sent with supply and an electronic copy to be sent to CERN by email).

4.5. Provisional Delivery Schedule

The Contractor shall arrange for the safe and efficient packing, transport and delivery to CEA Saclay of the parts in agreement with the schedule and procedures defined together with CEA.

5. CERN/CEA SACLAY CONTACT PERSONS

Persons to be contacted for technical matters:Name/Department/Group Telephone Email

Mr Vittorio Parma (CERN/TE/MSC-CMI)

Tel: +41 22 76 79183 [email protected]

In case of absence: Mr Jean-Marc Gheller / Mr Hervé ALLAIN (CEA/DRF/IRFU/DACM)

Tel: +33 1 69 08 13 11 +33 1 69 08 95 75

[email protected] [email protected]

Persons to be contacted for commercial matters:Name/Department/Group Telephone Email


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