STF

Recent Publication

• KEK 2009-3 -- STF Phase-1 Report (Japanese only)
  • Compressed PDF (16MB)
  • Unompressed PDF (55MB)

Regular Meetings

• STF Meeting Memo and Communication (Japanese).
• STF Meeting Presentation Materials (Japanese).
• Cavity Surface Studies (Japanese).
• Jlab-FNAL-KEK (JFK) S0 Meeting (English).

S1-Global Experiment

remote host :
• KEK-FNAL Discussion (2009/7/16)
• Regular Global Meeting (2009/7/7)
• Regular Global Meeting (2009/5/19)

EP Facility Operation

• Operation schedule of EP facility

What is STF?

STF is a project at KEK to build and operate a test linac with high-gradient superconducting cavities, as a prototype of the main linac systems for ILC. The initial primary goal of this project is to establish a facility where domestic and regional development activities for superconducting RF (SRF) technologies are to be based.

Progress So Far

The STF Phase-1 consisted operation of two units of 4-cavity cryomodules each containing up to 4 units of 9-cell cavities of so-called "TESLA-like design" and "Low-loss design". An extensive set of research infrastructure has been also built during the STF Phase-1. The program of STF Phase-1 completed at the end of March, 2009, and a report has been publised as KEK-2009-3 (Japanese only).

Forthcoming Activities

The forthcoming activities at STF involve continued development and operation of the research infrastructure such as electro-polishing and vertical testing of 9-cell cavities, and construction and operation of linac units based on superconducting cavity technologies. The latter will proceed in three steps: "S1-global", "Quantum-beam R&D" and "STF Phase-2".

The quantum beam project (operation planned for CY2012) is a project in which a prototype test is performed on a compact X-ray source on the basis of Compton scattering of laser light by a high-qulity, high-intensity beam from a superconducting linac.

The STF Phase-2 (initial operation planned for CY2013) is an experiment to build and operate a fully equipped one RF unit for the main linacs as currently conceived for ILC.

Reference Information

• STF Phase-1 Report. (Compressed PDF 13MB, Uncompressed PDF 55MB)
  
  
• Status report (Japanese, April, 2007)
• Progress and Plans for R&D and the Conceptual Design of the ILC Main Linacs (PAC2005 presentation by H.Hayano, July 2005)
• RF Sources of Superconducting Test Facility (STF) at KEK (PAC2005 presentation by S.Fukuda, July 2005)

• STF overview (LCPAC presentation by H.Hayano, February 2005).
• STF RF power sources (LCPAC presentation by S.Fukuda).
• STF Cryostat (LCPAC presentation by K.Tsuchiya).
• STF Cavities (LCPAC presentation by K.Saito).
• STF Couplers and Tuners (LCPAC presentation by S.Noguchi).
  
  
• STF Phase-1 Schedule (H.Hayano).
  
  
• ILC-Asia WG2 - Main linac systems.
• ILC-Asia WG5 - High-gradient superconducting cavities.

STF Installation Photo Diary

• Thumb nails library.
• Phase 0.5:
  • Jun. 28, 2007 | Jun. 11, 2007 | Jun. 8, 2007
  • May 21-25, 2007 | May 15, 2007 | May 9, 2007
  • Apr.20, 2007 | Apr.11, 2007 | Apr.4, 2007
  • Mar.23, 2007 | Mar.20, 2007 | Mar.12, 2007
  • Feb.28, 2007 | Feb.22, 2007 | Feb. 15, 2007 | Feb. 9, 2007
  • Jan. 29 - Feb.2, 2007 | Jan. 22-26, 2007 | Jan. 15-19, 2007 | Jan. 9-12, 2007
  • Dec. 25-27, 2006 | Dec. 18-22, 2006 | Dec. 11-15, 2006 | Dec. 4-10, 2006
  • Nov. 20-24, 2006 | Nov. 13-17, 2006

Related Images

• Interior of the equator portion of a single-cell cavity after welding.
• Former KEK Director Y.Totsuka visits STF.
• TTF meeting at KEK.
• Assembly of a coaxial ball screw tuner which has been built for an L-band 9-cell cavity.
• KEK Open House (September, 2006)
• Annual OHO Lectures (September, 2006)
• 3-D rendition of a cryomodule and a 9-cell cavity for ILC.
• Inside view of an L-band cavity
• L-band power station at STF
• Half-cups for an L-band cavity. They are made of large-grain Nb sheets from Ning-Xia, delivered to KEK via IHEP, Beijing.
• Grinding chips for centrifugal barrel polishing of cavity inner surfaces.
• L-band 9-cell cavity which was placed in barrel-polishing setup.
• Single-cell (ICHIRO design) cavities in stock.
• New clean room at STF for assembly work of cryomodules.
• Input couplers for high-gradient cavities (ICHIRO design) under testing.
• Mock-up 3-cell structure (Cu) fabricated with a hydroforming method.
• Vacuum vessel of a cryomodule under construction for STF at KEK.
• Cavity module (ICHIRO design) installed in a horizontal setup for test operation of tuners in a LN2 environment.
• Installation of a TESLA-style 9-cell cavity in a vertical test setup.
• Result of a "necking test" on a copper pipe, which was tried with a necking machine built in 2005.
• Subassemblies of input couplers for baseline L-band cavities under testing.
• Input couplers for baseline L-band cavities built at KEK.
• Three units of L-band 9-cell cavities (TESLA-style design) built in 2005-2006.
• L-band 9-cell cavity which was placed in the pretuning setup.
• L-band 9-cell cavity which was placed in the pretuning setup (another shot).
• A staff member and an L-band 9-cell cavity (LL-"Ichiro"-cavity) which was placed in a pre-tuning setup.
• ICHIRO cavity, module 2.
• ICHIRO cavity, module 1.