1. DESIGN AND PERFORMANCE OF VACUUM SYSTEM FOR HIGH HEAT FLUX TEST FACILITY Rajamannar Swamy*, Prakash Mokaria, Samir Khirwadkar, Sunil Belsare, M S Khan, Tushar patel, Deepu Krishnan Institute for Plasma Research, Bhat, Gandhinagar, India E-mail: rajamannar@ipr.res.inrajamannar@ipr.res.in Abstract ID:1_12 10 th Asia Plasma & Fusion Association Conference 14 th -18 th December 2015, Gandhinagar, India INTRODUCTION Vacuum chamber EB gun PWCS Target handling System Configuration: D-shaped double walled Material of construction: SS 304 L Vacuum requirement: 10 -6 mbar Dimensions: 2.5m dia, 1.5m height EB gun ports: 3 Nos. Diagnostic ports: 29 Nos. Beam dump (copper based): 3Nos Pumping ports: 4 Nos Test component : 1m 2 area, 1 Ton Design code: ASME Sec VIII Div.1 Target handing facility: Mounted on rail mechanism with hydraulic clamping Cooling lines: Chamber, beam dump, target DESIGN ANALYSIS VACUUM PUMPING SYSTEM Roughing Pumps : 5 Nos Rotary pump: 60 m 3 /h Root pump: 150 m 3 /h UHV pumps : 2 Nos TMP: 1900 l/s for N 2 Cryo : 4500 l/s for N 2 Total volume : 5 m 3 Ultimate vacuum : 1.8 x 10 -6 (mbar) Total pump down time: 60 minutes CONTROL SYSTEM SUMMARY Electron beam gun Max. beam power : 200 kW Max. accelerating voltage : 45 kV X-ray radiation : < 1µSv/h Deflection angle (Static and dynamic) : ± 25º Maximum rastering frequency : 10 kHz Beam diameter: 23 mm at 200 kW, 45 kV High pressure hot water loop Coolant : Deionized water Cooling temperature: 20ºC-80ºC Flow rate: 6 m 3 /h Inlet pressure max: 2 MPa Diagnostic devices Optical pyrometer: 3 Nos Temperature range: 350ºC -3500ºC Response time: 10 µs Digital IR camera: 2 Nos Temperature range: -15ºC -3000ºC Resolution: 320 x 256 pixels Sampling rate: 25 Hz to 1.3 kHz Accuracy: ± 1ºC Residual gas analyzer Calorimetry Data Acquisition & Control System Fig 1: High Heat Flux Test Facility (HHFTF) set up at IPR Fig 2: Vacuum system of HHFTF Fig 3: Temperature plots of inner and outer vessel dome Fig 4: Equivalent Von-Mises plot and total deformation plot Fig 5: Schematic of vacuum pumping lines RRP- Rotary pump TMP – Turbo Molecular Pump CP- Cryo Pump PR – Pirani Gauge EV – Electro Pneumatic Valve MV – Manual Valve CG – Compound Gauge VCGV- Variable Conductance Gate Valve Thermal hydraulic analysis is carried out at top, bottom plates and dome to estimate heat transfer coefficient and pressure drop at each channel. The average heat transfer coefficient estimated is considered as an input for steady state thermal analysis and coupled thermal-structural analysis Fig 6: Graph of Pump down time PXI & PLC based fast real time data acquisition and control system for vacuum data measurements, display and status indication, safety interlocks. Remote operation of vacuum pumping system using Human Machine Interface (HMI) Fig 7: Graphical user interface of vacuum pumping system Vacuum system for high heat flux test facility was successfully commissioned and its functionality was tested as per design requirements. Various subsystems of high heat flux test facility were integrated with vacuum system and their performance were tested. Hardwired interlocks were implemented for safe operation of vacuum system during high heat flux testing. Leak tightness of all welded joints, de-mountable joints, cooling circuits were ensured below 1.0x10 -6 mbar l/s during leak testing. Purging of dry and hot N 2 gas is carried out through the Cryo pump to reduce moisture effects and achieve better performance. Partial pressures of gases like oxygen, nitrogen, water, helium were monitored using residual gas analyzer during pump down and high heat flux tests.