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Editors' Overview of Issue 10

Challenges for Cryogenics at ITER
L. Serio for the ITER Organization, Domestic Agencies and Collaborators

Recent Activities at ISTEC
Shinya Hasuo

CRYOCOOLERS

Raytheon RSP2 Cryocooler Low Temperature Testing and Design Enhancements
R. C. Hon, C. S. Kirkconnell, and J. A. Shrago

Ultimate Temperature of Pulse Tube Cryocoolers
P. Kittel

Study on a Single-Stage 120Hz Pulse Tube Cryocooler
Wu Y. Z., Gan Z. H., Qiu L. M., Chen J., Li Z. P., Cao X. L.

Optimization Calculations for a 30 HZ, 4 K Regenerator with Helium-3 Working Fluid
Ray Radebaugh, Yonghua Huang, Agnes O’Gallagher, and John Gary

Theoretical and Experimental Investigation of a 4 K Single-Stage Stirling Type Pulse Tube Cryocooler with Precooling
Z.P. Li, J. Chen, Z.H. Gan*, and L.M. Qiu

A Non-Tube Inertance Device for Pulse Tube Cryocoolers
S.W.K. Yuan, D.G.T. Curran, and J.S. Cha

ACCELERATOR COMPONENTS AND SYSTEMS

Injector Upgrade for the Superconducting Electron Accelerator S-Dalinac
T. Kuerzeder, J. Conrad, R. Eichhorn, J.D. Fuerst, B. Bravo Garcia,
H.-D. Graef, C. Liebig, W.F.O. Mueller, A. Richter, F. Schlander,
S. Sievers, and T. Weiland

Superconducting Ring Cyclotron for Riken RI Beam Factory in Japan
H. Okuno, T. Dantsuka, K. Yamada, M. Kase, T. Maie and O. Kamigaito

LARP NB₃Sn Quadrupole Magnets for the LHC Luminosity Upgrade
P. Ferracin

TOKAMAK REFRIGERATION

Operation Results of the KSTAR Helium Refrigeration System
H.- S. Chang, E. Fauve, D.-S. Park, J.-J. Joo, K.-M. Moon,
K.-W. Cho, H. K. Na, M. Kwon, S.-H. Yang, and G. Gistau-Baguer

MgB₂ AND LTS CONDUCTORS & CABLES

Experimental Studies of Transverse Stress Effects on the
Critical Current of Sub-sized Niobium-tin Superconducting Cables
L. Chiesa, M. Takayasu, and J. V. Minervini

Plasma Synthesized Boron Nano-Sized Powder for MgB₂ Wires
J. V. Marzik, R. C. Lewis, M. R. Nickles, D. K. Finnemore, J. Yue, M. Tomsic, M. Rindfleisch, M. D. Sumption

Mechanical Properties of Modified JK2LB for Nb₃Sn CICC Applications
R. P. Walsh, K. Han, V. J. Toplosky,
N. N. Martovetsky, T. L. Mann Jr.and J. R. Miller

Fine Grained Nb for Internal Tin Nb₃Sn Conductors
S.Balachandran, R.E.Barber, Y. Huang,
H.Miao, J.A. Parrell, S. Hong, R.B. Griffin, K.T.Hartwig

Bending Effects on Critical Currents of Nb₃Sn Superconducting Wires
M. Takayasu, L. Chiesa, J. H. Schultz, and J. V. Minervini

HTS COATED CONDUCTOR TAPES

Torsion Strain Effects on Critical Currents
of HTS Superconducting Tapes
Makoto Takayasu, Joseph V. Minervini, and Leslie Bromberg

Microstructure and Critical Current Density of YBa₂Cu₃O_7-x + BaSnO₃Thick Films Grown with Pre-Mixed Pulsed Laser Ablation Target
J. Burke, C.V. Varanasi, L. Brunke, H. Wang, J.H. Lee, P.N. Barnes

Second Phase (BaGeO₃, BaSiO₃) Nanocolumns in YBa₂Cu₃O_7-xFilms
C. V. Varanasi, J. Reichart, J. Burke,
H. Wang, M. Susner, M. Sumption, P.N. Barnes

BULK HTS MATERIALS

The Generation of High Trapped Fields in
Bulk (RE)BCO High Temperature Superconductors
D. A. Cardwell, W. K. Yeoh, S. K. Pathak,
Y-H Shi, A. R. Dennis, N. Hari Babu, and K. Iida

The Puzzle of Two Different Sub-Micrometer Tungsten-Rich Deposits in Bulk YBCO: One Acts as Pinning Centers and the Other Does Not
Ravi-Persad Sawh, Roy Weinstein, Drew Parks, and Alberto Gandini

HTS Coated Conductors Developed for the European Super3C Cable
Alexander Usoskin, Alexander Rutt, Herbert C. Freyhardt,, Burkhard Prause, Klaus Schlenga, Jean-Maxime Saugrain, Arnaud Allais, Dag Willén