SLAC National Accelerator Laboratory: J. Amann, R. Arnold, D. Walz, A. Seryi Bhabha Atomic Research Centre: P. Satyamurthy, P. Rai, V. Tiwari, K. Kulkarni Starting Point for Work SLAC 2.2 MW Water Dump, The Stanford Two-Mile Accelerator, R.B. Neal Ed, (1968). High Power Water Beam Dump for a LC, M. Schmitz, TESLA Collaboration Meeting, 16 Sept 2003. ILC Main Beam Dumps -- Concept of a Water Dump,
D. Walz Snowmass, 18 Aug 2005. Dumps and Collimators, ILC Reference Design Report, 2007 T. Davenne, O. Caretta, C. Densham and R. Appleby, Pressure Transients in the ILC Beam Dump, LC-ABD Collaboration meeting, Birmingham University, 17 April 2008 LCWS 2010 Amann - 3/26/10 Global Design Effort 3 Introduction The task force team studied the various aspects of the SLACs 2.2MW water beam dump and used it as the starting basic reference design for an ILC Beam dump, since it has all features required of an ILC beam dump (but at a lower power level) but proven design. This includes the use of a vortex-like flow
pattern to dissipate and remove the energy deposited by the beam, the beam dump entrance window and its special cooling method, a remote window exchange mechanism, a hydrogen re-combiner, handling of radioactive 7Be, a tail catcher to attenuate the residual beam energy remaining after the vortex flow region, as well as related primary and secondary cooling loops. LCWS 2010 Amann - 3/26/10 Global Design Effort 4 Mechanical Design Concept The 18MW LC beam dump mechanical design is driven by parameters and constraints developed from FLUKA simulations, CFD thermal hydraulic
simulations and analytic calculations. The existing 2.2MW SLAC beam dump provides a baseline mechanical design to consider features which might be incorporated into the 18MW beam dump mechanical design concept. The first step in creating a mechanical design concept for the beam dump is to establish the basic mechanical design parameters of the beam dump vessel and thin window. The beam dump is a pressurized vessel containing heated and radioactive water and consequently for operation within the USA, must conform to the design and safety standards of the American Society of Mechanical Engineers Boiler and Pressure Vessel Code.
LCWS 2010 Amann - 3/26/10 Global Design Effort 5 Mechanical Design Concept Table of Beam Dump Design Parameters and Constraints Operating Parameters Maximum Operating Temperature Maximum Operating Pressure Minimum Operating Pressure <180C 20bar or 290psi 10bar or 145psi
Beam Dump Vessel Internal diameter Length 1.8m 10m Beam Dump Inlet Headers 2 @ Up beam end of vessel Inlet header location 8 (203mm) ID with longitudinal slots 0.7m from center on horizontal plane Beam Dump Outlet Header 1 @ Up beam end of vessel Outlet header location 10 (254mm) ID with perforations all around Center axis of vessel
Beam Dump Thin Window Hemispherical shape Internal diameter Maximum thickness Window location Window cooling LCWS 2010 Amann - 3/26/10 Pressure on concave side 300mm 1mm 0.35 - 0.45m from center of vessel vertical plane Single water jet Global Design Effort 6
LCWS 2010 Amann - 3/26/10 Global Design Effort 10 Beam Parameters The following beam parameters have been taken as reference for designing the beam dump: Electron/Positron energy: 500 GeV Number of electrons/positrons per bunch: 2x1010 Number of bunches per train: 2820 Duration of the bunch train: 0.95 ms Beam size: x = 2.42mm y = 0.27 mm
Energy in one bunch train: 4.5 MJ Number of bunch trains per second: 4 Beam power: 18 MW Beam sweep radius: 6 cm LCWS 2010 Amann - 3/26/10 Global Design Effort 11 Interaction of electrons/positrons with Beam Dump (FLUKA Studies) Energy Density Modulation Around Sweep Path
LCWS 2010 Amann - 3/26/10 Global Design Effort 12 Interaction of electrons/positrons with Beam Dump LCWS 2010 Amann - 3/26/10 Global Design Effort 13 Interaction of electrons/positrons with Beam Dump
Energy deposited by one bunch train in the water (beam travelling along z-axis) max @ z=1.8m LCWS 2010 Amann - 3/26/10 Radially integrated longitudinal linear power density max @ z=2.9m Global Design Effort 14 Interaction of electrons/positrons with Beam Dump Longitudinal Power Density in Vessel Wall (20mm thick 316L SS) Beam @ r=45cm LCWS 2010
Amann - 3/26/10 Beam @ r=35cm Global Design Effort 15 Interaction of electrons/positrons with Beam Dump Heat Flux Down Beam Head LCWS 2010 Amann - 3/26/10 Global Design Effort 16 Interaction of electrons/positrons with Beam
Dump A FLUKA analysis was carried out to in the thin window. The total power deposited is ~25 W with a maximum power density of 21W/cm3. Functional fitted data is the input for the CFD analysis. LCWS 2010 Amann - 3/26/10 W/cm3 determine the beam power distribution
Global Design Effort 17 Thermal hydraulic Studies(by FLUENT) Total mass flow rate of water taken was 190kg/s. Water inlet was assumed to be at 500C as dictated by the primary coolant loop. The bulk outlet temperatures would be ~730C for 18 MW average beam power. The water inlet velocity at the slit exit is 2.17 m/s. Velocity contours at z = 2.9m LCWS 2010 Amann - 3/26/10 Steady state temperature distribution at z = 2.9m (Max average temperature : 1270C ) Global Design Effort
18 Thermal hydraulic Studies-cont. Maximum temperature variation as a function of time at z = 2.9m Maximum temperature ~1550C and variation with time ~300C LCWS 2010 Amann - 3/26/10 Maximum temperature variation as a function of time at z = 1.8 m Maximum temperature ~1350C and variation with time ~360C Global Design Effort
19 Thermal hydraulic Studies-cont. Temperature distribution in the vessel at z = 2.9m for the 0.45m radial beam location max vessel temperature - 940 C min vessel temperature - 810C LCWS 2010 Amann - 3/26/10 Temperature distribution in the vessel at z = 4.2m for the 0.45m radial beam location max vessel temperature - 900 C min vessel temperature - 700C Global Design Effort
20 Thermal hydraulic Studies-cont. Window Cooling - Work In Progress LCWS 2010 Amann - 3/26/10 Global Design Effort 21 Thermal hydraulic Studies-cont. Window Cooling - Work In Progress LCWS 2010 Amann - 3/26/10 Global Design Effort
22 Thermal hydraulic Studies-cont Flat Head Cooling - Work In Progress LCWS 2010 Amann - 3/26/10 Global Design Effort 23 Thermal hydraulic Studies-cont. Flat Head Cooling - Work In Progress LCWS 2010 Amann - 3/26/10 Global Design Effort
24 Inlet header studies-(In progress) Design of Inlet Headers Flow analysis in the Header indicated that there was significant velocity component along z- direction (vz) in the initial exit region of the Header, reducing the required outlet v ( component of the velocity). In order to enhance (v) and reduce the vz , two alternative approaches are currently being considered; i) providing flow blocks at various locations in the exit slit of the Header, ii) providing water to the Header by multiple pipes along the z. The final configuration will be based on the outcome of this analysis. LCWS 2010 Amann - 3/26/10 Global Design Effort
25 Inlet header studies-(In progress) Configuration-1 Flow blocks each of width of 5mm Exit nozzle of inlet header each of length 95mm Water outlet Water inlet Configuration-2 water inlet pipes with 1 meter spacing along the water inlet Header Water outlet LCWS 2010 Amann - 3/26/10
Global Design Effort 26 FLUKA Studies Preliminary Activation Studies First Design Concept LCWS 2010 Amann - 3/26/10 Global Design Effort 27 Summary Mechanical design concept under development. Basic mechanical parameters established. More detailed analysis of inlet header in progress Window sealing design and remote exchange system still needs work.
Preliminary process design complete. Thermal-hydraulic studies nearly complete. Beam dump parameters determined by physics. Inlet headers, outlet header, and window locations optimized. Working to finalize window cooling and down beam head cooling. Shielding design and overall system integration still needs work. Future work we feel is critical. Build a scaled down version of beam dump to verify FLUENT studies. Beam damage testing of thin window materials. LCWS 2010 Amann - 3/26/10 Global Design Effort 28
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