CYCLOTRONS 2010 - List of Authors (Dey, R.)

Paper	Title	Page
MOPCP008	Control System of Cryogenic Plant for Superconducting Cyclotron at VECC	57
	U. Panda, T. Bhattacharjee, R. Dey, A. Mandal, S. Pal DAE/VECC, Calcutta, India
	Cryogenic Plant of Variable Energy Cyclotron Centre consists of two Helium refrigerators (250 W and 415 W @ 4.5K), valve box with sub-cooler and associated sub systems like pure gas storage, helium purifier and impure gas recovery etc. The system also consists of 3.1K liters of liquid Nitrogen (LN2) storage and delivery system. The plant is designed to cater the cryogenic requirements of the Superconducting Cyclotron. The control system is fully automated and does not require any human intervention once it is started. EPICS architecture has been adopted to design the SCADA module. The EPICS Input Output Controller (IOC) communicates with four Programmable Logic Controllers (PLCs) over Ethernet based control LAN to control/monitor 618 numbers of field inputs/ outputs. The plant is running very reliably round the clock, however, the historical data trending of important parameters during plant operation has been integrated to the system for plant maintenance and easy diagnosis. The 400 kVA UPS with 10 minutes back up time have been installed to keep the cryogenic system running with one 160 kW cycle compressor during utility power interruptions.

MOPCP076	Operational Experience of Superconducting Cyclotron Magnet at VECC, Kolkata	203
	U. Bhunia, M. Ahmed, R.K. Bhandari, T. Bhattacharyya, M.K. Dey, R. Dey, A. Dutta, A. Dutta Gupta, C. Mallik, C. Nandi, Z.A. Naser, G.P. Pal, U. Panda, S. Paul, J. Pradhan, S. Saha DAE/VECC, Calcutta, India
	The Kolkata Superconducting cyclotron magnet has been operational in the center since last few years and enabled us to extensively map magnetic fields over a year covering the operating range of the machine and successful commissioning of internal beam. The magnet cryostat coupled with the liquid helium refrigerator performs satisfactorily with moderate currents (<550A) in both the coils. The superconducting coil did not undergo any training and over the years has not suffered from any quench. Author would share the experience and difficulties of enhanced overall heat load to the liquid helium refrigerator at higher excitations of coils. This creates instability in the operation of liquid helium refrigerator and finally leads to slow dump. Rigorous study has been carried out in this regard to understand the problems and operational logic of liquid helium refrigerator has been modified accordingly to alleviate from. Some other measures have also been taken from cryostat and cryogenic distribution point of view in order to reduce the heat load at higher excitations.

Paper

Title

Page

Control System of Cryogenic Plant for Superconducting Cyclotron at VECC

57

U. Panda, T. Bhattacharjee, R. Dey, A. Mandal, S. Pal
DAE/VECC, Calcutta, India

Cryogenic Plant of Variable Energy Cyclotron Centre consists of two Helium refrigerators (250 W and 415 W @ 4.5K), valve box with sub-cooler and associated sub systems like pure gas storage, helium purifier and impure gas recovery etc. The system also consists of 3.1K liters of liquid Nitrogen (LN2) storage and delivery system. The plant is designed to cater the cryogenic requirements of the Superconducting Cyclotron. The control system is fully automated and does not require any human intervention once it is started. EPICS architecture has been adopted to design the SCADA module. The EPICS Input Output Controller (IOC) communicates with four Programmable Logic Controllers (PLCs) over Ethernet based control LAN to control/monitor 618 numbers of field inputs/ outputs. The plant is running very reliably round the clock, however, the historical data trending of important parameters during plant operation has been integrated to the system for plant maintenance and easy diagnosis. The 400 kVA UPS with 10 minutes back up time have been installed to keep the cryogenic system running with one 160 kW cycle compressor during utility power interruptions.

MOPCP076

Operational Experience of Superconducting Cyclotron Magnet at VECC, Kolkata

203

U. Bhunia, M. Ahmed, R.K. Bhandari, T. Bhattacharyya, M.K. Dey, R. Dey, A. Dutta, A. Dutta Gupta, C. Mallik, C. Nandi, Z.A. Naser, G.P. Pal, U. Panda, S. Paul, J. Pradhan, S. Saha
DAE/VECC, Calcutta, India

The Kolkata Superconducting cyclotron magnet has been operational in the center since last few years and enabled us to extensively map magnetic fields over a year covering the operating range of the machine and successful commissioning of internal beam. The magnet cryostat coupled with the liquid helium refrigerator performs satisfactorily with moderate currents (<550A) in both the coils. The superconducting coil did not undergo any training and over the years has not suffered from any quench. Author would share the experience and difficulties of enhanced overall heat load to the liquid helium refrigerator at higher excitations of coils. This creates instability in the operation of liquid helium refrigerator and finally leads to slow dump. Rigorous study has been carried out in this regard to understand the problems and operational logic of liquid helium refrigerator has been modified accordingly to alleviate from. Some other measures have also been taken from cryostat and cryogenic distribution point of view in order to reduce the heat load at higher excitations.