NUCLOTRON CONTROL SYSTEM (NCS) V.Andreev, E.Frolov, A.Kirichenko, A.Kovalenko, B.Vasilishin, V.Volkov Laboratory of High Energies, JINR, Dubna

Nuclotron Facility The superconducting synchrotron Nuclotron is intended to accelerate nuclei and multicharged ions. Circumference251.5 m Magnetic fieldup to 2 T Magnets: 96 dipoles 64 quadrupoles 32 multipoles

NCS Subsystems Thermometry and Cryogenic Diagnostics Injection and Injection Beam Line Control and Diagnostics Magnetic Field Correction Control and Diagnostics Circulating Beam Diagnostics Main Power Supplies Control and Diagnostics Slow Extraction and Extracted Beam Lines Control, External Beam Diagnostics Radio Frequency Control Radiation Safety Diagnostics

NCS Layout

NCS control & measurement points

NCS Software. Overview

NCS Software. Data Flows

NCS Local Area Network More than 50 computers are communicated: about 20 front-end ones and over 30 workstations Distributed Backbone structure Backbone on physical layer 100Base-FX NCS Average Data Flow is up to 250 kB/s (will be up to 2.5 MB/s after integration of the Beam Dynamics Investigation Subsystem)

NCS LAN Structure

RF Control Subsystem Digital synthesizer Acquitek CG100 as master oscillator DDS technology RF retuning when magnetic field changes by T

Beam Dynamics Investigation Subsystem The purposes of the Subsystem are: monitoring of beam parameters on the first turns and at the beginning of acceleration investigation of the beam losses causes detection of the bethatron frequency

Beam Dynamics Investigation Subsystem The signals from the ES pick- ups are measured now by 8-bit DAQ (256K on-board memory) with sampling rate of 50 MHz. Measurement duration is 5 ms. Algorithms of bunch detection and base line shift compensation were worked through. The 14-bit Gage Compuscope DAQ (8M memory) will be used during the nearest accelerator run. Measurement duration will be 80 ms.

Beam Dynamics Investigation Subsystem

Main Power Supplies Control Subsystem The subsystems controls power supplies of the bending (BM), focusing (FQ) and defocusing (DQ) magnets. Main machine cycle parameters: maximum magnetic field value- 2 Т main field ramping rate- up to 0.7 T/s cycle repetition rate Hz flat-top duration - from hundreds ms to 16 s

Main Power Supplies Control Subsystem The cycle is specified at the B(t) level The master signal for the BM supply is generated by tandem of pulse function generator (PFG) and analog function generator (AFG) The scaled value of real BM field is used as the reference for the QD supply; the real QD field is used as the reference for the QF supply Digital function (trains) is monitoring by pulse train analizer; the analog ones is measured by 16-bit multichannel DAQ (sampl. rate: 1 kHz)

Main Power Supplies Control Subsystem A new version of the subsystem is developed now. The hardware of the present subsystem is in CAMAC standard (3 crates, 50 modules). The new one will be equipped with precise function generators, scaling multiplying DACs, multichannel DAQs etc. in the PCI/ISA standard.

Conclusion At present, though not at its final dimension, the control system is fully operational and has the proposed functionality. An essential step to provide the accelerator with a high performance and flexible computer control environment has been accomplished