1. New Nuclotron Beam Intensity Monitoring Subsystem V. Andreev, A. Butenko, A. Kirichenko, S. Romanov, G. Trubnikov, V. Volkov Veksler and Baldin Laboratory of High Energy Physics, JINR, Dubna, Russia XXII International Symposium on Nuclear Electronics & Computing ____________________________________________________________

2. Abstract A new Nuclotron Beam Intensity Monitoring Subsystem (NBIMS) is based on a Parametric Current Transformer (manufacturer: BERGOZ instrumentation). It allows Nuclotron beam current and intensity monitoring correlated with the main magnetic field signal (sampling rate is 100 kSamples/s). Common structure, electronic equipment, software and first results of the Subsystem are described in this report. XXII International Symposium on Nuclear Electronics & Computing ____________________________________________________________

3. Nuclotron Facility The superconducting synchrotron Nuclotron is intended to accelerate nuclei and multicharged ions. Circumference251.5 m Magnetic fieldup to 2 T Particle Energyup to 6 Gev/u 39 runs has been performed XXII International Symposium on Nuclear Electronics & Computing ____________________________________________________________

4. The Nuclotron Control System Two physical levels: Operator Control and Front End 17 geographically separated Subsystems Total number of points for meas. and control: ~ 3500 Fast Ethernet LAN as the System common backbone XXII International Symposium on Nuclear Electronics & Computing ____________________________________________________________

5. NBIMS structure XXII International Symposium on Nuclear Electronics & Computing ____________________________________________________________

6. Parametric Current Transformer XXII International Symposium on Nuclear Electronics & Computing ____________________________________________________________ Ranges from ±20mA to ±20A Frequency response: up to 10kHz Inducing protection Manufacturer: BERGOZ Instr.

7. Analogue Function Generator XXII International Symposium on Nuclear Electronics & Computing ____________________________________________________________ The 2-channels Counter is based on Altera EPN7128 The 14-bits DAC is based on AD 760 AFG works in 0…10V range 1 AFG bit corresponds to 0.1 Gs magnetic field value The Counter and the DAC are galvanic isolated

8. CyberResearch CMF 1622HRDA board XXII International Symposium on Nuclear Electronics & Computing ____________________________________________________________ Multifunction Analog I/O Board for PCI 16/8 inputs (Single Ended/Differential Mode) Up to 250 kHz sampling rate 16 bits resolution 8 MSamples Local Acquisition Memory Possibility of external triggering

9. NBIMS working cycle XXII International Symposium on Nuclear Electronics & Computing ____________________________________________________________

10. Reproduction of beam intensity XXII International Symposium on Nuclear Electronics & Computing ____________________________________________________________ where U – voltage signal from the PCT, f – beam revolution frequency, B – main magnetic field, B(0) = B inj, k – constant of proportionality. The NBIMS properly works in 10 8 …10 12 intensity range for proton and deuteron beams.

11. NBIMS software XXII International Symposium on Nuclear Electronics & Computing ____________________________________________________________ The NBIMS software complex (developed for.NET Framework) consists of three parts: Server – equipment management, data acquisition and processing, data providing to client Client – remote viewing of data from the Server Administrator – remote management of client connections to the Server

12. NBIMS software: Data presentation XXII International Symposium on Nuclear Electronics & Computing ____________________________________________________________

13. NBIMS software: Remote Data Viewing XXII International Symposium on Nuclear Electronics & Computing ____________________________________________________________ Remote viewing of the data is carried out by means of sockets technology via IP-network. Data transmission from the Server to multiple Clients is realized on “Publish-Subscribe” model. The Client sends to the Server a special request for subscription to NBIMS information. The Server either includes this Client to the “mailing list” or rejects the client request. After acquisition and processing of new data the Server dispatches it to all "subscribers”.

14. NBIMS software: the Client Modes XXII International Symposium on Nuclear Electronics & Computing ____________________________________________________________ Extended Mode - the data with maximum time resolution is transferred from the Server. Sampling interval: 10 µs Data volume: ~ 10 Mbytes It is used for the machine precise tuning and investigations. In the Simple Mode only 30 Kbytes of the data is transferred. It is sufficient for representation of an overall chart of the accelerator cycle.

15. First results XXII International Symposium on Nuclear Electronics & Computing ____________________________________________________________ The NBIMS was successfully used during two last runs of the Nuclotron. The Subsystem has proved as a powerful tool for accelerator tuning. Also some important machine investigations such as two step acceleration mode experiment, testing of the adiabatic capture equipment and energy evacuation system were carried out with help of the NBIMS.

16. NBIMS in the Adiabatic Capture Experiment XXII International Symposium on Nuclear Electronics & Computing ____________________________________________________________

17. Future plans XXII International Symposium on Nuclear Electronics & Computing ____________________________________________________________ Interface improvement: separate signals scaling on amplitude Optimal increasing of the signals time resolution for the Client in the Simple mode Web-support for external users