New Nuclotron Beam Intensity Monitoring Subsystem

1. XXII International Symposium on Nuclear Electronics & Computing ____________________________________________________________ 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

2. XXII International Symposium on Nuclear Electronics & Computing ____________________________________________________________ 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.

3. XXII International Symposium on Nuclear Electronics & Computing ____________________________________________________________ Nuclotron Facility • The superconducting synchrotron Nuclotron is intended to accelerate nuclei and multicharged ions. • Circumference 251.5 m • Magnetic fieldup to 2 T • Particle Energy up to 6 Gev/u • 39 runs has been performed

4. XXII International Symposium on Nuclear Electronics & Computing ____________________________________________________________ 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

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

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

7. XXII International Symposium on Nuclear Electronics & Computing ____________________________________________________________ Analogue Function Generator • 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. XXII International Symposium on Nuclear Electronics & Computing ____________________________________________________________ CyberResearch CMF 1622HRDA board • 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. XXII International Symposium on Nuclear Electronics & Computing ____________________________________________________________ NBIMS working cycle

10. XXII International Symposium on Nuclear Electronics & Computing ____________________________________________________________ Reproduction of beam intensity where U – voltage signal from the PCT, f – beam revolution frequency, B – main magnetic field, B(0) = Binj , k – constant of proportionality. The NBIMS properly works in 108…1012 intensity range for proton and deuteron beams.

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

13. XXII International Symposium on Nuclear Electronics & Computing ____________________________________________________________ NBIMS software: Remote Data Viewing 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. XXII International Symposium on Nuclear Electronics & Computing ____________________________________________________________ NBIMS software: the Client Modes 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 Modeonly 30 Kbytes of the datais transferred . It is sufficient for representation of an overall chart of the accelerator cycle.

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

17. XXII International Symposium on Nuclear Electronics & Computing ____________________________________________________________ Future plans • 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