A five-year project (MEXT advanced Accelerator element Technology Development (MEXT-ATD)) funded by the Ministry of Education, Culture, Sports, Science and Technology (MEXT) began at KEK in FY2023. The goal is to manufacture, construct and test a cryomodule (CM) that satisfies the ILC (International Linear Collider Project) specifications and conduct cooling tests. The MEXT-ATD program is...
In the scope of the MEXT ATD and the ILC Technology Network (ITN) an ILC prototype cavities are currently being fabricated at KEK and at a vendor. The main Nb material for the central cell-part of cavity are conventional Fine-Grain (FG) Nb and newly introduced Medium-Grain (MG) Nb. We already fabricated four FG-Nb and two MG-Nb 1.3-GHz single-cell cavities. Our plan is to fabricate five FG-Nb...
In the scope of the MEXT ATD and the ILC Technology Network an ILC prototype cryomodule is currently being built at KEK. The cryomodule consists of several sub-systems, such as eight 1.3 GHz 9-cell TESLA-type superconducting cavities, fundamental power couplers, cavity frequency tuners, cavity magnetic shielding, and a superconducting quadrupole magnet. In addition to these, further external...
MEXT-ATD program and ILC technology network (ITN) collaboration were started from 2023 at KEK. Under these activities, ILC prototype cryomodule (CM) is designed and produced toward 2K high power RF test which is scheduled in 2028. Even though, CM was designed based on ILC TDR, several designs such as thermal shield structure, cooling tube dimensions and so forth will be changed for the cost...
The International Linear Collider (ILC) Main Linac consists of a series of cryomodules, one third of which are composed by eight 9-cell superconducting RF (SRF) cavities and a superconducting quadrupole (SCQ) package. The electrons and positrons are focused by the quadrupole and steered by the two dipoles included in the SCQ magnet. Large expected dark currents are originated at the SRF...
The Compact Linear Collider (CLIC) Damping Rings (DRs) need to generate ultra-low emittance bunches to achieve high luminosity in CLIC. This requires many wiggler magnets with big energy loss which is compensated by the Radio Frequency (RF) system. The resulting strong beam loading transients lead to a challenging design for the RF system. A novel SRF cavity at 2 GHz with an ultra-low R/Q...
The heat treatment of SRF cavities at medium temperature ($250°\text{C}$ to $350°\text{C}$), also known as “mid-T heat treatment”, is one of the R&D activities at DESY towards a high-duty-cycle (HDC) upgrade of the European XFEL.
Such treated cavities exhibit an improvement in the quality factor $Q_0$ ($3\cdot10^{10}$ to $5\cdot10^{10}$) at a moderate accelerating electric field strength...
The ESS superconducting linac is an in-kind contribution by IJCLAB (Spoke cavities and Cryomodules), INFN (Medium Beta Cavities), STFC (High beta cavities) and CEA (all elliptical cryomodule assembly). Spoke cryomodules have been tested at the FREIA Facility in Uppsala and at the elliptical at the ESS Test Stand 2 in Lund.
In the talk we summarize the first phase experience of cryomodules...
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Superconducting materials such as niobium have been extremely useful for accelerator technology but require low temperature operation ~2 K. The development of high temperature superconductors (HTS) is promising due to their operating temperatures being closer to that of liquid nitrogen ~77 K. This work aims to determine the high-power RF performance of these materials at X-band (11.424 GHz)....
