Joint institute for nuclear research Volkov V.I., Gorbachev E.V., Kirichenko A.E., Sedykh G.S. NEC’2015 The thermometry system of superconducting magnets test bench for the NICA accelerator complex.

Superconducting magnets test bench general view Georgy Sedykh, JINR NEC’2015 Shoulder 1 Shoulder 2 Satellite refrigerators

Specification - Precise temperature control in the different parts of test bench during cryogenic tests. - The resistance temperature sensors (Pt100, TVO) are being used as a thermometers. - The quantity of sensors (~25), their location and characteristics depends on type of the test session. The thermometry system should provide: 1.Temperature data acquisition and storage in the 24x7x365x5 mode; 2.Temperature data mapping in the graphs, tables and mnemonic diagrams; 3.Stored temperature data viewing and exporting; 4.Easy configuration; Georgy Sedykh, JINR NEC’2015

Test session thermometry scheme Georgy Sedykh, JINR NEC’2015 Cryostat with magnet Cryostat with current leads

1.Resistance temperature sensors: - TVO. Range: 1 kΩ (293 K) – 4.5 kΩ (4 K); - Pt100. Range: 100 Ω (293 K) – 7 Ω (4 K); 2.NI PXI-8820 system controller; 3.NI PXIe-4357 Data Acquisition for RTD Measurements (24 bit, 20 channels); 4.Precise current sources - 20 µA for TVO; µA for Pt100; Hardware Georgy Sedykh, JINR NEC’2015 Advantages: 1.High precision; 2.High level of interference suppression in 50 Hz;

Software. Tango Tango device-servers:  ADC data acquisition module (PXI modules control, data acquisition, data filtering);  Temperature calculation module;  Database storage access module;  System configuration module;  Data export module (Excel, SQL);  Tango modules for web access (REST, WebSocket, WebAuth); Georgy Sedykh, JINR NEC’2015 Advantages: 1.Easy management; 2.Easy extension; 3.Easy implementation to the NICA control system;

Software. Database  Experiments data storage;  Configuration storage (information about session, sensors, hardware); Georgy Sedykh, JINR NEC’2015 Advantage: System configuration for the new test session can be performed by the operator through the special configuration tool;System configuration for the new test session can be performed by the operator through the special configuration tool;

Software. Client application Web application providing operator interface Georgy Sedykh, JINR NEC’2015 Advantages: 1.Flexible design (web desktop); 2.Access from any device in local network (PC, tablet); 3.No additional software (only web browser);

Software. Web client application. Table Mnemonicdiagram Line chart Data viewing Georgy Sedykh, JINR NEC’2015

Fro m FE M oscil lator  WebSocketDS - to read Tango attributes through WebSockets;  RestDS - to provide access to Tango control system units through http(s) requests (Ajax);  TangoWebAuth - to provide web access control; Tango web tools Georgy Sedykh, JINR NEC’2015 tangodevel.jinr.ru

Summary: 1.Standalone thermometry system for superconducting magnets test bench; 2.Prototype for the NICA thermometry system; 3.Precision of the voltage drop across the sensor measurement ~ 10µV per 80 mV scale. (~0.0125%); 4.User-friendly flexible web client application; 5.Toolbox consist of Tango web tools (WS, REST) with JavaScript web framework (like ExtJS) can be used for developing other control system client applications. Georgy Sedykh, JINR NEC’2015 Current work: 1.Extend the system to 6 shoulders (currently 2); 2.New powerfull server Supermicro (for data storage); 3.New configuration tool (for operator’s pleasure);

Thank you for your attention! Georgy Sedykh, JINR NEC’2015