WEOCS —  Accelerator Technology II   (30-Mar-11   13:00—15:00)
Chair: G. Apollinari, Fermilab, Batavia, USA
Paper Title Page
WEOCS1 Development of Long Nb3Sn Quadrupoles by the US LHC Accelerator Research Program 1455
 
  • G.L. Sabbi
    LBNL, Berkeley, California, USA
 
  Insertion quadrupoles with large aperture and high gradient are required to upgrade the luminosity of the Large Hadron Collider (HL-LHC). The US LHC Accelerator Research Program (LARP) is a collaboration of DOE National Laboratories aiming at demonstrating the feasibility of Nb3Sn magnet technology for this application. Several series of magnets with increasing performance and complexity have been fabricated, with particular emphasis on addressing length scale-up issues. Program results and future directions are discussed.  
slides icon Slides WEOCS1 [4.433 MB]  
 
WEOCS2 Development of Nb3Sn 11 T Single Aperture Demonstrator Dipole for LHC Upgrades 1460
 
  • A.V. Zlobin, N. Andreev, G. Apollinari, E.Z. Barzi, V. Kashikhin, A. Nobrega, I. Novitski
    Fermilab, Batavia, USA
  • B. Auchmann, M. Karppinen, L. Rossi
    CERN, Geneva, Switzerland
 
  Funding: Work is supported by Fermi Research Alliance, LLC, under contract No. DE-AC02-07CH11359 with the U.S. Department of Energy
The LHC collimation upgrade foresees additional collimators installed in dispersion suppressor regions. To obtain the necessary space for the collimators, a solution based on the substitution of LHC main dipoles for stronger dipoles is being considered. CERN and FNAL have started a joint program to demonstrate the feasibility of Nb3Sn technology for this purpose. The goal of the first phase is the design and construction of a 2-m long single-aperture demonstrator magnet with a nominal field of 11 T at 11.85 kA with 20% margin. This paper describes the magnetic and mechanical design of the demonstrator magnet and summarizes its design parameters.
 
slides icon Slides WEOCS2 [2.523 MB]  
 
WEOCS3
HTS Magnets for Accelerator and Other Applications  
 
  • R.C. Gupta, M. Anerella, G. Ganetis, P.N. Joshi, H.G. Kirk, R. B. Palmer, S.R. Plate, W. Sampson, Y. Shiroyanagi, P. Wanderer
    BNL, Upton, Long Island, New York, USA
  • D.B. Cline
    UCLA, Los Angeles, California, USA
  • J. Kolonko, R.M. Scanlan, R.J. Weggel
    Particle Beam Lasers, Inc., Northridge, California, USA
 
  Funding: This work is supported by the U.S. Department of Energy under Contract No. DE-AC02-98CH10886.
High Temperature Superconductors (HTS) are now becoming a crucial part of future medium and high field magnet applications in several areas including accelerators, energy storage, medical and user facilities. A second generation HTS quadrupole is being constructed for the Facilities for Rare Isotope Beams (FRIB). The muon collider requires high field solenoids in the range of 40-50 T - an R&D that is partly supported by SBIRs and partly programs at various laboratories. Superconducting Magnetic Energy Storage (SMES) R&D, recently funded by ARPA-E, requires large aperture HTS solenoid in the range of 25-30 T. A user facility at National High Magnetic Field Laboratory (NHMFL) has been funded to develop a 32 T solenoid. All of these programs require HTS in a quantity never obtained before for magnet applications and would play a key role in developing HTS for magnet applications. High field magnets pose special challenges in terms of quench protection, large stored energy and large stresses, etc. This presentation will review various ongoing activities, and examine the future prospects of HTS magnets in a number of applications, with a particular emphasis on high field applications.
 
slides icon Slides WEOCS3 [2.761 MB]  
 
WEOCS4 Integrated EM & Thermal Simulations with Upgraded VORPAL Software 1463
 
  • D.N. Smithe, D. Karipides, P. Stoltz
    Tech-X, Boulder, Colorado, USA
  • G. Cheng, H. Wang
    JLAB, Newport News, Virginia, USA
 
  Funding: This work supported by a DOE Phase II SBIR.
Nuclear physics accelerators are powered by microwaves which must travel in waveguides between room-temperature sources and the cryogenic accelerator structures. The ohmic heat load from the microwaves is affected by the temperature-dependent surface resistance and in turn affects the cryogenic thermal conduction problem. Integrated EM & thermal analysis of this difficult non-linear problem is now possible with the VORPAL finite-difference time-domain simulation tool. We highlight thermal benchmarking work with a complex HOM feed-through geometry, done in collaboration with researchers at the Thomas Jefferson National Accelerator Laboratory, and discuss upcoming design studies with this emerging tool. This work is part of an effort to generalize the VORPAL framework to include generalized PDE capabilities, for wider multi-physics capabilities in the accelerator, vacuum electronics, plasma processing and fusion R&D fields, and we will also discuss user interface and algorithmic upgrades which facilitate this emerging multiphysics capability.
 
slides icon Slides WEOCS4 [0.996 MB]  
 
WEOCS5 Experience of the Cryogenic System for Taiwan Light Source 1466
 
  • F. Z. Hsiao, C.-S. Hwang
    NSRRC, Hsinchu, Taiwan
 
  In Taiwan light source a superconductive cavity and five superconductive magnets are installed in the storage ring. The cryogenic system provides liquid helium and liquid nitrogen with stable pressure. Failure events occurred on the components such as expansion turbine, compressor, and frequency inverter during the past years. A supervision system was developed to monitor the status of the cryogenic system and an automatic call out system was built to notify the operators when abnormal condition appears. To shorten the interruption period of liquid helium supply, the dewar keeps stable and continuous supply of liquid helium and the recovery compressor collets the evaporated helium gas from the cryostat for cases of several hours shutdown of the cryogenic system. Humidity, cleanliness and helium leak tightness are items necessary to be well controlled before connecting new components or application devices to the cryogenic system. The matching between system cooling capacity and heat load is achieved via adjustment of turbine speed, precooling temperature, compressor speed, and heater power.  
 
WEOCS6 The Injector Cryomodule for e-Linac at TRIUMF 1469
 
  • R.E. Laxdal, C.D. Beard, S.R. Koscielniak, A. Koveshnikov, A.K. Mitra, T.C. Ries, I. Sekachev, V. Zvyagintsev
    TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
  • M. Mondal, V. Naik
    DAE/VECC, Calcutta, India
 
  The e-Linac project at TRIUMF, now funded, is specified to accelerate 10mA of electrons to 50MeV using 1.3GHz multi-cell superconducting cavities. The linac consists of three cryomodules; an injector cryomodule with one cavity and two accelerating modules with two cavities each. The injector module is being designed and constructed in collaboration with VECC in Kolkata. The design utilizes a unique box cryomodule with a top-loading cold mass. A 4K phase separator, 2K-4K heat exchanger and Joule-Thompson valve are installed within each module to produce 2K liquid. The design and status of the development will be presented.  
slides icon Slides WEOCS6 [13.002 MB]  
 
WEOCS7 Crab Cavity and Cryomodule Prototype Development for the Advanced Photon Source 1472
 
  • H. Wang, G. Cheng, G. Ciovati, W.A. Clemens, J. Henry, P. Kneisel, P. Kushnick, K. Macha, J.D. Mammosser, R.A. Rimmer, G. Slack, L. Turlington
    JLAB, Newport News, Virginia, USA
  • R. Nassiri, G.J. Waldschmidt, G. Wu
    ANL, Argonne, USA
 
  Funding: Work is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11354.
Two single-cell, superconducting, squashed elliptical crab cavities with waveguides to damp Higher Order Modes (HOM) and Lower Order Mode (LOM) have been designed and prototyped for the Short Pulse X-ray (SPX) project at the Advanced Photon Source (APS). The Baseline cavity with LOM damper on the beam pipe has been vertically tested and exceeded its performance specification with over 0.5MV deflecting voltage. The Alternate cavity design which uses an “on-cell” waveguide damper is preferred due to its larger LOM impedance safety margin. Its prototype cavity has been fabricated by a Computer Numerical Controlled (CNC) machine and is subject to further testing. The conceptual design, layout and analysis for various cryomodule components are presented.
 
slides icon Slides WEOCS7 [7.008 MB]