Kryostat

Kurze Beschreibung

To achieve the physics program of Nucleus we plan to use a newest-generation dry dilution refrigerator, which can be operated strictly without the use of cryogenic liquids such as liquid He and N (except for the limited amount of the He3/He4 mixture). Such a system is the absolute requirement for the use in the special environment of a nuclear power reactor. Special emphasis is put on the low-noise aspects of the system, in particular on the decoupling of the vibrational noise induced by the pulse-tube cooler. Ultimately, an advanced decoupling of pulse-tube and the Nucleus cryogenic detectors is needed to reach our physics goals. Further, we require a system that is fully automated and allows a maintenance-free operation over the time scale of 1 year or more.
The subject of this procurement procedure is the award of a supply contract for a dry dilution refrigerator for Nucleus.

Beschreibung der Beschaffung

— dry dilution refrigerator with insert,
— 3He-4He dilution unit with welded step heat exchanger and no soft-solder joints in the dilution unit. The dilution unit must be exchangeable without removing the wiring of the cryostat and the copper plates at all cooling stages,
— pulse-tube cooler PT420-RM or equivalent and a linear motor drive of the rotary valve,
— guaranteed base temperature of < 10 mK,
— experimental volume of at least 30 cm in diameter and 60 cm in height,
— a minimum cooling power of 500 uW at 100 mK and 16 uW at 20 mK with the compressor bypassed,
— cool-down time from 300 K to 10 mK in <24 hours,
— an appropriate gas handling system (GHS) including all necessary pumps, compressors, flow meter, valves, mixture tanks etc. The GHS must be fully automatic (i.e. software controlled). The entire cooling cycle is software controlled and automatic, including the GHS, but also must allow for manual control of the refrigerator. All pumps and compressor are oil-free. The control unit must automatically recover from power faults in a manner that ensures the safety of the refrigerator,
— control unit including the possibility for full remote control, including software and process control system,
— the cold trap must allow for proven continuous refrigerator operation (experimental proof in an existing system) without the need of any liquid cryogenics for > 2 years. The system must be integrated in the dry fridge,
— support frame for the cryostat,
— a central rod in the dilution fridge that allows for a maximum load of at least 200 kg below the mixing chamber plate, without affecting the cooling performance of the cryostat. Baffels of metal plates that might be installed in the rod at different temperature stages acting as radiation shields have to be removable in order to install a custom-made spring system (provided by TUM) from 300 K to 10 mK at a later stage,
— heavy duty support frame to damp vibrations and to stand the extended payload of the setup,
— all components for the interconnection of dry dilution refrigerator and the gas handling system with all necessary measures to decouple mechanically and electronically,
— thermometry at different temperature stages including readout and control,
— full documentation of all processes required for the operation and control of the refrigeration,
— superconducting NbTi wiring (56 x 2 channels) from 4 K to mixing chamber and Cu wiring (56 x 2 channels) from 300 K to 4 K with appropriate connectors and a breakout box at room temperature,
— a system for He-4 condensation into a reservoir on the 4 K temperature stage (“He battery”) which allows a temporary operation (typically > 3 h) of the refrigerator at base temperature with the pulse-tube cooler being switched off. Including all necessary equipment, tubing, heat exchanger and connections to He supply at 300 K. The functionality of the system has to be experimentally proven in an existing setup and must be commercially available,
— manual operation and control of the system via a control panel,
— custom layout of the system to adapt it to the laboratory at TUM and ready-to-operate installation and proof of operation of the system on-site at TUM, including operating instructions and training for TUM,
— the He4/He3 mixture is not part of the supply contract, and will be provided by the TUM. The necessary information (amount and mixing ratio) will be provided by the contractor well before the installation at the TUM. The provided mixture will be inserted during the installation of the system on-site,
— the rotary pump for the mixing circuit is not part of the supply contract, and will be provided by TUM.

Liste und kurze Beschreibung der Bedingungen

The following documents (self-declarations, information, certificates and/or other supporting documents) proving the absence of grounds for exclusion and the fulfillment of the selection criteria must be submitted with the tender:
1) Self-declaration (pursuant to Section 123 (1) to (3) GWB) that no person whose conduct is attributable to the tenderer or a member of the group of economic operators has been convicted, or a fine has been legally established against the economic operator, pursuant to Section 30 OWiG, for an offense against the codes as set out in the procurement and procedure description, Section 4.2.3 (1);
2) Self-declaration that the tenderer has fulfilled its obligation to pay taxes, duties and social security contributions (§ 123 (4) GWB);
3) Self-declaration (on facultative exclusion grounds pursuant to § 124 GWB) that:
— neither the tenderer's company nor any person whose conduct is attributable to the tenderer has failed to fulfill its obligations under environmental, social or labor law when executing public contracts,
— the tenderer's company is not insolvent, insolvency proceedings or similar proceedings have not been instituted or opened for the assets of the tenderer's company, the opening of such proceedings has not been refused for lack of assets, and the company is not in liquidation or has ceased its activity,
— neither the tenderer's company nor any person whose conduct is attributable to the company has been guilty of grave professional misconduct that calls into question the integrity of the company,
— neither the company nor any person whose conduct is attributable to the company has entered into agreements with other undertakings which have the effect of preventing, restricting or distorting competition,
— the entity has not materially or consistently fulfilled a material breach in the execution of a previous public procurement or procurement contract, resulting in termination, damages or similar legal consequences;
4) Self-declaration (pursuant to § 21 Schwarzarbeitsbekämpfungsgesetz — SchwarzArbG) that during the last 3 years neither the tenderer nor its legal representatives have committed an offense against:
— § 8 (1) No 2, §§ 10 to 11,
— § 404 (1) or (2) No 3 Book 3 of the Social Code (SGB III),
— §§ 15, 15a, 16 (1) No 1, 1c, 1d, 1f or 2 of the Temporary Employment Act (AÜG), or
— § 266a (1) to (4) of the Criminal Code (or the respective Codes of the country of incorporation of the tenderer or the members of the group of economic operators) that led or might lead to an imprisonment sentence of more than 3 months or a fine of more than 90 days' pay or at least 2 500 EUR;
5) Self-declaration regarding the enrolment/registration number of the economic operator's undertaking in professional or trade registers (if applicable).

Liste und kurze Beschreibung der Auswahlkriterien

7) Self-declaration (according to the following requirements) of a sufficient level of experience demonstrated by at least 3 reference projects (each having as subject a supply contract for a comparable dry dilution refrigerator) in the past 3 fiscal years (2016 to 2018) (minimum requirement), stating name, address and Email address of a contact person of the contracting body of the reference project and a project name and description of the services provided by the tenderer. TUM reserves the right to verify the tenderer's details by interrogating the contracting body of the reference project.

Genaue Informationen über Fristen für Überprüfungsverfahren

The application for a review procedure at the review body as set out in Section VI.4.1) is inadmissible pursuant to § 160 (3) GWB if:
1) The tenderer has recognized the alleged infringement of public procurement rules prior to the submission of the petition for review and has not issued a complaint to TUM within a period of ten calendar days;
2) Infringements of public procurement rules which are discernible on the basis of the Contract Notice are not notified to TUM at the latest by the expiry of the time-limit specified in the contract notice for the tender;
3) Infringements of procurement rules which are discernible on the basis of the procurement documents are not notified to TUM at the latest by the expiry of the time limit specified in the contract notice for the tender; or
4) More than 15 calendar days have elapsed after receipt of the notification by TUM to not remedy a complaint of the tenderer.