11

The Cryogenic System for the The Cryogenic System for the TIFRTIFR--BARC Superconducting BARC Superconducting

LINAC BoosterLINAC Booster

M.B. M.B. KurupKurupTata Institute of Fundamental ResearchTata Institute of Fundamental Research

Homi Bhabha Road, Homi Bhabha Road, ColabaColaba, , Mumbai Mumbai -- 400 005400 005

Joint TIFR – BARC Project

Specifications

Heavy ions upto A~80E/A~5-12 MeV

Energy gain 14MV/qModule 7 nosResonators 28 nos

Bunch width ~200 psBeam Intensity 0.1-10 pnA

Phase I commissioned on September 22nd, 2002

Linear Accelerator Linear Accelerator -- LINACLINAC

•• Module 7 Module 7 nosnos, Resonators 28 , Resonators 28 nosnos•• Energy gain 14MV/q Energy gain 14MV/q •• Heavy ions Heavy ions uptoupto A~80 can be acceleratedA~80 can be accelerated•• E/A~5E/A~5--12 MeV, b~0.112 MeV, b~0.1--0.160.16•• Bunch width @~200 Bunch width @~200 psps•• Beam Intensity 0.1Beam Intensity 0.1--10 10 pnApnA

Superconducting QWRSuperconducting QWRQuarter Wave Resonators

Cavity Diameter 20 cmVelocity acceptance β ~ 0.06-0.15Accelerating Field 2.5 to 3 MV/mPower Dissipation 6 to 9 Watts

Module CryostatModule Cryostat

Four Four QWRsQWRs

Top view of the module

The first beam was accelerated through the LINAC Booster on 22nd

Sept. 2002.The first set of experiments with three LINAC modules were successfully conducted in April-May’03.

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)~104 ; P~50 kWatts

Q(Pb, 4.2K) ~108 ; P~5 Watts

Superconducting LINAC smaller & efficient

Cryogenic aspectCryogenic aspect

•• OFHC copper cavities with 2OFHC copper cavities with 2µµm m PbPb plating plating •• Superconducting below 7.2KSuperconducting below 7.2K•• Design goal: at 4.2K with 2.5 to 3MV/m Design goal: at 4.2K with 2.5 to 3MV/m

potential dissipating 6W RF loadpotential dissipating 6W RF load•• Each cryostat housing 4 cavitiesEach cryostat housing 4 cavities•• Total 30 cavities @180W RF loadTotal 30 cavities @180W RF load

Components of distribution Components of distribution systemsystem

•• LINDE LINDE tcftcf 50s He 50s He LiquifierLiquifier•• NN2 2 liquifierliquifier / supply / supply dewardewar•• Main distribution boxMain distribution box•• Trunk lineTrunk line•• Junction boxJunction box•• Modular CryostatModular Cryostat

LINDE TCF 50sLINDE TCF 50s

•• Helium Refrigerator Helium Refrigerator LindeLinde TCFTCF--50S50S•• Al Plate Fin Heat ExchangersAl Plate Fin Heat Exchangers•• Two stage Turbine Expansion Engines Two stage Turbine Expansion Engines •• Two stage JT ExpansionTwo stage JT Expansion•• 250 KW Screw Compressor 62 g/s250 KW Screw Compressor 62 g/s

•• Refrigeration at 4.5 K/Refrigeration at 4.5 K/LiquificationLiquification•• Without LN2 300 W, 50 l/hrWithout LN2 300 W, 50 l/hr•• With LN2preWith LN2pre--cooling 380 W, 120 l/hrcooling 380 W, 120 l/hr

CryogenicsHelium Refrigerator Linde TCF-50S

Refrigeration at 4.5 KWithout LN2 300 WWith LN2pre-cooling 380 W

LiquificationWithout LN2 50 l/hrWith LN2 pre-cooling 120 l/hr

250 KW Screw Compressor 62 g/sTwo stage Turbine Expansion Engines 10 KTwo stage JT Expansion 4.2 KAl Plate Fin Heat Exchangers

Liquid He refrigerator

Process diagram Process diagram

•• Two phase fluid produced at the final JT is divided Two phase fluid produced at the final JT is divided betwbetwnn cryogenic cryogenic distribution system and distribution system and dewardewar..

•• Phase separation takes place in the cryostats and boiledPhase separation takes place in the cryostats and boiled--off gas off gas returns to cold box.returns to cold box.

•• Depending on load flow is controlled to maintain pressure and Depending on load flow is controlled to maintain pressure and attain preset return gas temperature of 4.5Kattain preset return gas temperature of 4.5K

? ?

cooling water

SI 3131

0 rps

SI 3151

0 rps

TI 3130

0.0 K

TI 3112

0.0 K

PI 3130

0.00 bar

PI 3150

bara

CV 3130

0.0 %

K 3199

NV 3131

LN2 precool

HV3100

HV 3200

TI 3110

0.0 K

TI 3155

0.0 K

From Comp

To comp

purifier cooling

E3110

??

E 3120F3100

F 3130

E 3150

E 3131 E 3151

A3154

E 3160

ATM

purifier return

NV 3151

purified helium

Main

CV 3615

E 3140

A3134

EV 3131

0 %EV 3151

0 %

? ?

??

????

??

??

CV 3131

0.0 %CV 3229

0.0 %

CV 3209

0.0 %

CV 3269

0.0 %

CV 3169

0.0 %

K3299

TI 3279

0.0 K

PI 3185

0.00 bara

? ?

? ?

CV 3170

0.0 %

CV 3175

0.0 %

TI 3290

0.0 K

PI 3290

0.00 bara

PV 3108

CV 3165

X 3130 X 3150

K3195

To Dewar

GHe return

LHe supply

0.00

Graphics

0.0 %

? ?

%0.0

CV 3290

Main Distribution boxMain Distribution box

The main junction The main junction box is connected to box is connected to the helium the helium refrigerator, refrigerator, liqliq. He . He and and liqliq. N2 storage . N2 storage dewarsdewars. .

Provided with Provided with PtxPtx, , SiSi diode, pressure diode, pressure relief and blow off relief and blow off valves.valves.

Trunk LineTrunk Line

•Vacuum insulated trunk line, 100mm in dia. has four tubes

•Made in separate sections with kennol fittings supported by teflon spacer

Filling station

Transfer tube to the cryostatDistrubutionDistrubution boxbox

Individual triaxial transfer tubes of the cryostat serve as a final heat exchanger and a remote JT

Inside view of the fillingstation

The entire cryogenic distribution was fabricated and assembled on-site and has performed as per design.

•• Each module Each module cryostat houses cryostat houses 4 4 QWRsQWRs, gravity , gravity fed from a fed from a liqliq. . He vessel of 40 He vessel of 40 lit. capacitylit. capacity

•• Each module has Each module has 60 60 ltrltr capacity capacity nitrogen vessel nitrogen vessel and nitrogen and nitrogen shieldshield

Module Cryostat in a beam lineModule Cryostat in a beam line

•• Incorporated with Incorporated with liquid level sensor, liquid level sensor, thermometry, thermometry, pressure transducer pressure transducer and several safety and several safety features.features.

•• MV and check valve MV and check valve are connected to are connected to recovery bag.recovery bag.

•• Recovery system has Recovery system has three bags of 10mthree bags of 10m33

capacity each.capacity each.

Pressure drop and actual heat loadPressure drop and actual heat load

•• The pressure drop on the feed line is between 80 to The pressure drop on the feed line is between 80 to 120 mbar.120 mbar.

•• ∆∆P P for the return line is 20 to 40 mbar.for the return line is 20 to 40 mbar.•• Actual Heat load Actual Heat load

distribution system distribution system -- 16W 16W Each transfer tube Each transfer tube –– 4W4WStanding Cryostat Standing Cryostat –– 6W6W

•• Total heat load of 134W for Phase I is observedTotal heat load of 134W for Phase I is observed

Cooldown of cryostatCooldown of cryostat

•• Each cryostat has Each cryostat has @250kg of cooldown @250kg of cooldown mass & cooldown mass & cooldown period is @30 hrs.period is @30 hrs.

•• Cooldown of several Cooldown of several cryostat together cryostat together saves time.

figure 5, Cooldown comparison.

050

100150200250300350400

0.0 0.5 1.0 1.5 2.0day(24hr)

Tem

pera

ture

K

SBCRYO 3CRYO 2+3

saves time.

Instrumentation and controlInstrumentation and control•• LindeLinde plant is designed to work on a Siemens SIMATIC S7plant is designed to work on a Siemens SIMATIC S7--400 PLC 400 PLC

systemsystem•• We have developed a control system for the remote operation of We have developed a control system for the remote operation of

the plant from accelerator room using WINCC.the plant from accelerator room using WINCC.•• Presently cryogenic distribution system is manually controlled fPresently cryogenic distribution system is manually controlled from rom

accelerator room.accelerator room.•• All the devices will to be later integrated in to the PLC systemAll the devices will to be later integrated in to the PLC system of of

the cold box.the cold box.–– PTX100 for pressure measurementPTX100 for pressure measurement–– DT420 silicon diode for temp. measurementDT420 silicon diode for temp. measurement–– American American magneticsmagnetics make He liquid level sensormake He liquid level sensor–– Electrically operated cryogenic valvesElectrically operated cryogenic valves–– ElectroElectro--pneumatic operated liquid Npneumatic operated liquid N22 valvevalve–– CapacitativeCapacitative liquid Nliquid N2 2 level sensorlevel sensor

•• The automation of the one cryostat on PLC was successfully done.The automation of the one cryostat on PLC was successfully done.

Cryostat modules housing the resonators with liquid He distribution box

TIFR, BARCSINP, VECC, IOP,Universities,GANIL, IPN-Orsay, CEA/Saclay, Univ. of Sao Paulo, Univ. of Notre Dame…….

Nuclear Physics

Applications tomedicine

& environment

Radiochemical studies

Accelerator basedAtomic physicsCondensed matter

physics (TDPAD)

FissionNuclear Structure-GDR-Spectroscopy-Nuclear Level densitiesFusion around the Coulomb barrier Direct reactions-elastic scattering-Transfer reactions

Heavy Ion ResonancesInComplete FusionCompound nuclear Lifetime measurement………….

Developmental activities

LAMPS – data acq. System

Gas detectors, Electronics

300 publications in refereed journals (12 Phys. Rev. Letters) + 50 Ph.D. Theses www.tifr.res.in/~pell

TIFR & BARC Collaboration

TeamR.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. YadavC. D’Costa Q.A. Ansari P.J. Bhalerao S.K. Sarkar L.V. Kamble S. Powale V.L. Kadam

TIFRDept of Nuclear And Atomic Physics

Central Workshop

Central Services

Low Temperature Facility

BARCNuclear Physics Division

Electronics Division

Central Workshop

Vendors• IBP • Vacuum Techniques • Aarti Engineering • Fullinger • SMP Enterprises • BEL •

• Accelerator Consultancy Services • Transact-India/Danfysik • SAMEER •

View of Tower and LabView of Tower and Lab-- BlockBlock