M.B. Kurup Tata Institute of Fundamental Research Homi Bhabha Road, Colaba, Mumbai

Transcription

1 The Cryogenic System for the TIFR-BARC Superconducting LINAC Booster M.B. Kurup Tata Institute of Fundamental Research Homi Bhabha Road, Colaba, Mumbai

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3 Joint TIFR BARC Project Specifications Heavy ions upto A~80 E/A~5-12 MeV Energy gain 14MV/q Module 7 nos Resonators 28 nos Bunch width ~200 ps Beam Intensity pna Phase I commissioned on September 22 nd, 2002

4 Linear Accelerator - LINAC Module 7 nos,, Resonators 28 nos Energy gain 14MV/q Heavy ions upto A~80 can be accelerated E/A~5-12 MeV, b~ Bunch ps Beam Intensity pna

5 Superconducting QWR Quarter Wave Resonators Cavity Diameter 20 cm Velocity acceptance β ~ Accelerating Field 2.5 to 3 MV/m Power Dissipation 6 to 9 Watts

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7 Module Cryostat Top view of the module Four QWRs

8 The first beam was accelerated through the LINAC Booster on 22 nd Sept The first set of experiments with three LINAC modules were successfully conducted in April-May 03.

9 Why superconducting? Q=f/ f=ωu/p ; Quality factor QWR: f=150mhz, E=3 MV/m U (stored energy) ~0.5 Joules Q(Cu, 300K)~10 4 Q(Pb, 4.2K) ~10 8 ; P~50 kwatts ; P~5 Watts Superconducting LINAC smaller & efficient

10 Cryogenic aspect OFHC copper cavities with 2µm 2 Pb plating Superconducting below 7.2K Design goal: at 4.2K with 2.5 to 3MV/m potential dissipating 6W RF load Each cryostat housing 4 cavities Total 30 RF load

11 Components of distribution system LINDE tcf 50s He Liquifier N 2 liquifier / supply dewar Main distribution box Trunk line Junction box Modular Cryostat

12 LINDE TCF 50s Helium Refrigerator Linde TCF-50S Al Plate Fin Heat Exchangers Two stage Turbine Expansion Engines Two stage JT Expansion 250 KW Screw Compressor 62 g/s Refrigeration at 4.5 K/Liquification Without LN2 300 W, 50 l/hr With LN2pre-cooling 380 W, 120 l/hr

13 Cryogenics Helium Refrigerator Linde TCF-50S Refrigeration at 4.5 K Without LN W With LN 2 pre-cooling 380 W Liquification Without LN 2 50 l/hr With LN 2 pre-cooling 120 l/hr 250 KW Screw Compressor 62 g/s Two stage Turbine Expansion Engines 10 K Two stage JT Expansion 4.2 K Al Plate Fin Heat Exchangers Liquid He refrigerator

14 Process diagram Two phase fluid produced at the final JT is divided betw n cryogenic distribution system and dewar. Phase separation takes place in the cryostats and boiled-off off gas returns to cold box. Depending on load flow is controlled to maintain pressure and attain preset return gas temperature of 4.5K

15 Main PV 3108 cooling water Graphics CV 3615 EV % NV 3131 NV 3151 E 3131 E 3151 EV % 0 % SI 3151 LN2 precool CV 3130? 0.0 % SI rps 0 rps X 3130 X 3150 ATM TI 3110 A3134 F 3130 PI bar TI K PI bara TI K CV K? 0.0 % E 3150 CV 3165? From Comp?? E 3140 A3154 CV 3170? 0.0 % To Dewar F3100 HV3100 E3110 TI K E 3120 E 3160 K3195 CV 3290? 0.0 % To comp HV 3200 CV 3169 TI 3290 purified helium purifier return CV 3209?? 0.0 % CV 3229?? 0.0 % CV 3131?? 0.0 % purifier cooling CV 3269?? 0.0 % 0.0 %?? 0.0 K PI bara K 3199 LHe supply K3299 TI 3279 PI 3185 GHe return 0.0 K 0.00 bara

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17 Main Distribution box The main junction box is connected to the helium refrigerator, liq.. He and liq.. N2 storage dewars. Provided with Ptx, Si diode, pressure relief and blow off valves.

18 Trunk Line Vacuum insulated trunk line, 100mm in dia. has four tubes Made in separate sections with kennol fittings supported by teflon spacer

19 Distrubution box Filling statio n Transfer tube to the cryostat Individual triaxial transfer tubes of the cryostat serve as a final heat exchanger and a remote JT Inside view of the filling station The entire cryogenic distribution was fabricated and assembled on-site and has performed as per design.

20 Each module cryostat houses 4 QWRs,, gravity fed from a liq. He vessel of 40 lit. capacity Each module has 60 ltr capacity nitrogen vessel and nitrogen shield

21 Module Cryostat in a beam line Incorporated with liquid level sensor, thermometry, pressure transducer and several safety features. MV and check valve are connected to recovery bag. Recovery system has three bags of 10m 3 capacity each.

22 Pressure drop and actual heat load The pressure drop on the feed line is between 80 to 120 mbar. P for the return line is 20 to 40 mbar. Actual Heat load distribution system - 16W Each transfer tube 4W Standing Cryostat 6W Total heat load of 134W for Phase I is observed

23 Cooldown of cryostat Each cryostat of cooldown mass & cooldown period hrs. Cooldown of several cryostat together saves time. Temperature K day(24hr) figure 5, Cooldown comparison. SB CRYO 3 CRYO 2+3

24 Instrumentation and control Linde plant is designed to work on a Siemens SIMATIC S7-400 PLC system We have developed a control system for the remote operation of the plant from accelerator room using WINCC. Presently cryogenic distribution system is manually controlled from f accelerator room. All the devices will to be later integrated in to the PLC system of the cold box. PTX100 for pressure measurement DT420 silicon diode for temp. measurement American magnetics make He liquid level sensor Electrically operated cryogenic valves Electro-pneumatic operated liquid N 2 valve Capacitative liquid N 2 level sensor The automation of the one cryostat on PLC was successfully done.

25 Cryostat modules housing the resonators with liquid He distribution box

26 TIFR, BARC SINP, VECC, IOP, Universities, GANIL, IPN-Orsay, CEA/Saclay, Univ. of Sao Paulo, Univ. of Notre Dame. Condensed matter physics (TDPAD) Applications to medicine & environment Radiochemical studies Nuclear Physics Accelerator based Atomic physics Developmental activities LAMPS data acq. System Gas detectors, Electronics Fission Nuclear Structure -GDR -Spectroscopy -Nuclear Level densities Fusion around the Coulomb barrier Direct reactions -elastic scattering -Transfer reactions Heavy Ion Resonances InComplete Fusion Compound nuclear Lifetime measurement. 300 publications in refereed journals (12 Phys. Rev. Letters) + 50 Ph.D. Theses

27 TIFR & BARC Collaboration Team R.G. Pillay M.B. Kurup B. Srinivasan Vandana Nanal P.B. Patil K.S. Parab J.N. Karande P.B. Thakkar S. Jangam Sudheer Singh M.Y. Vaze Gopal Joshi C.I. Sujo S.M. Yadav C. D Costa Q.A. Ansari P.J. Bhalerao S.K. Sarkar L.V. Kamble S. Powale V.L. Kadam TIFR Dept of Nuclear And Atomic Physics Central Workshop Central Services Low Temperature Facility BARC Nuclear Physics Division Electronics Division Central Workshop Vendors IBP Vacuum Techniques Aarti Engineering Fullinger SMP Enterprises BEL Accelerator Consultancy Services Transact-India/Danfysik SAMEER

28 View of Tower and Lab- Block