Image: H. Hayano | 29 March 2012At KEK's superconducting RF test facility, better known as STF, scientists are conducting beam tests of their photocathode RF gun towards beam operation of the accelerator for the Quantum Beam Project. On 22 March, scientists succeeded in the extraction of a 1-millisecond beam for a 162.5-megahertz bunch train. Pictured here is a signal from the beam position monitor (blue) and a laser gate signal (violet). Read more about the Quantum Beam Project in a future issue of ILC NewsLine.
Category: Image of the week | Tagged: beam monitor, KEK, Quantum Beam Project, STF
17 November 2011At the Superconducting Test Facility (STF) at KEK, Japan, the construction of the injector cryomodule equipped with two ILC-type nine-cell cavities has begun for the Quantum Beam experiment. The cavity string has been brought out of the clean room, ready for tuner installation. The gas return pipe is being readied to be placed in the cold-mass assembly framework.
Category: Image of the week | Tagged: KEK, Quantum Beam experiment, STF, superconducting cavity
Rika Takahashi | 9 December 2010Designing and fabricating an optimal accelerating cavity is not so simple. There are two important parameters scientists are looking for: the gradient of 35 megavolts per meter (MV/m) and the quality factor (Q0) of greater than 0.8×10^10. A Japanese cavity now fulfilled those requirements for the first time at a test which took place at the Superconducting radiofrequency Test Facility (STF) at KEK, adding momentum towards future mass production.
Category: Feature | Tagged: accelerating gradient, cavity gradient, KEK, Kyoto camera, nine-cell cavity, quality factor, STF
Rika Takahashi | 28 January 2010Four superconducting accelerating cavities have been successfully assembled at KEK’s Superconducting RF Test Facility (STF). From 14 to 22 January, the assembly team of technical staff from DESY and Fermilab visited KEK, and completed cavity-string assembly work in the STF cleanroom, making a wonderful start for S1 global, a crucial system test towards realising the International Linear Collider.
Category: Feature | Tagged: cavity string, DESY, Japan, KEK, STF
7 January 2010A big Christmas gift arrived at KEK from Italy. On 25 December, KEK's Superconducting radiofrequency Test Facility (STF) welcomed the cryomodule for "S1-global" - a crucial system test towards realizing the International Linear Collider (ILC), a proposed next generation electron-positron collider.
Category: Feature | Tagged: Italy, Japan, KEK, S1-global, STF
8 October 2009Scientists at Kyoto university are testing a new type of thermal sensor for superconducting cavities on the vertical test for ILC at the Superconducting radiofrequency Test Facility (STF) at KEK. This sensor is under development by a Kyoto-KEK collaboration The team is developing this new device to address issues in the components of the sensor – tangled wires and resistors. At STF, a carbon resistor is used for vertical testing of nine-cell cavities. They have already installed 350 sensors on the outer surface of the nine-cell cavity, and 700 lead wires were needed to connect both ends of sensors through cryogenic area and outside, in order to measure the temperature. “For a shorter developing time, I have chosen carbon resistor which is technologically proven in the past superconducting cavity R&D. This structure is simple, not so sophisticated.” said Yasuchika 'Kirk' Yamamoto, the scientist at KEK who designed the present system. When the cavity is being tested, it is cooled to 2 kelvins, and has to stay at that temperature as much as possible. In general, it is best to use the smallest possible number of lead wires to prevent heat invasion to the cryogenic area. “The current system needs too many lead wires, and the production of the carbon resistor has been discontinued, we thought we should develop a new thermal sensor to replace it,” he said.
Category: Around the World | Tagged: KEK, STF, thermal sensors, vertical test