1. The status of preparation of the SPD Technical project / A.Guskov
The latest version of TDR (v.057) has been presented. It contains all the information necessary to review the project. In addition to the technical description of the subsystems, the document reflects the situation with the cost and availability of equipment and materials as of February 2022. The TDR may still contains misprints, typos. They will be corrected as updates are received.
One important update is still expected this year. Namely, a section will be added with verification calculations for the distribution of loads on the floor of the SPD hall. A corresponding meeting with the company making the calculations ("KOMETA") will take place next week. With the exception of this amendment, the Technical Board unanimously approved the present version of the TDR. A summary of the TDR will be reported to the JINR Program Advisory Committee (PAC) for Particle Physics in January 2023.
2. Comparative examination of two SPD magnet projects / A.Korzenev
The current version of the TDR contains two projects of the superconducting magnet proposed by the BINP and JINR groups. Essentially, the difference between the two projects has to do the cable-type technologies being considered for the magnet and the associated cooling methods.
1. BINP project: The use of a Rutherford-type cable made of NbTi/Cu superconductor. The cable will be encased in an aluminum stabilizer using a co-extrusion process that provides a good bond between aluminum and superconductor in order to ensure quench protection during operation. Indirect cooling of the superconductor will be provided by two-phase helium, which will circulate in pipes welded to the outside of the coil former.
2. LHEP JINR project: The technology of superconducting coils manufacturing is based on a hollow high-current cable similar to the one used for the Nuclotron magnets or the one used in the ITER systems. The manufacturing technology of the hollow cable made of NbTi/Cu composite wires is well developed at LHEP JINR. The cooling system is supposed to use a single-phase cooling scheme with supercritical helium.
For an objective choice between the projects, an external expert (Reviewer), who was not bound by a contract with either of the two organizations representing the projects, was invited. Once receiving the text of the comparative examination from the Reviewer, a committee was created from members of the Technical Board. They are: Anosov V., Alexeev G., Guskov A., Korzenev A., Ladygin V. After careful consideration last week, the Committee issued the following recommendation.
Recommendation of the Committee:
The Committee appreciates the work done by the JINR and BINP groups on the preparation of the conceptual design of the SPD magnet. Based on the criteria for the reliability of the operation of the magnetic system, the possibility of implementing the proposed projects in the current conditions, as well as availability of human resources and their experience gained in the implementation of similar projects, the Committee makes the following recommendation. The BINP project is considered to be more realistic in terms of the SPD time schedule, manufacturing and commissioning, as well as guarantees of reliability in operation. The Committee recommends the SPD Technical Board to support this project for further development. The Committee would also like to point out that since the magnet will eventually operate in JINR, close cooperation between the two groups that submitted the projects is important to achieve the final result.
This recommendation was unanimously supported by the Technical Board.
Nota bene: The full summary of the Committee meeting (in English) can be found on the Indico page of the meeting. TB members who were unable to attend the TB meeting can send me their comments before the end of next week (December 23). In the absence of comments, the TB decision will come into force on December 23.
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