International Workshop on Future Linear Colliders 2026

Session

High Gradient RF Techniques

11 Nov 2026, 14:30

KEK

53. Status of the COLD (Cool copper Operation Linac) Project

Alessandro D'Elia (ESRF)

11/11/2026, 14:30

High Gradient RF Techniques

Oral presentation (remote)

The ESRF long-term plan for the upgrade of the injection complex foresees a full 6 GeV energy linac option. Given the space limitations of the site, the linac must fit in < 140 m, compactness is a strong design constraint. The most promising candidate to fulfill this goal is the C2 (Cool Copper at 77 K) technology in C-Band (5.712 GHz). The COLD Project intends to demonstrate the readiness of...

47. Update on C-band activities at LANL

Evgenya Simakov (LANL)

11/11/2026, 14:50

High Gradient RF Techniques

Oral presentation (onsite or remote - not decided)

This talk will report on the status of C-band research activities at Los Alamos National Laboratory. This includes commissioning of the Cathodes And Radio-frequency Interactions in Extremes (CARIE) high gradient C-band RF photoinjector test stand and design and fabrication of the high-gradient C-band proton acceleration structures. We are testing functionality of the CARIE test stand by...

112. High-Power Test Results for Multiple-Sector X-band Accelerating Structures Fabricated Using Different Materials but Based on the Same Design

Abe Tetsuo (KEK)

11/11/2026, 15:10

High Gradient RF Techniques

Oral presentation (onsite)

Multiple-sector X-band accelerating structures were designed and fabricated with four quadrants [Nucl.Instrum.Meth.A 1063 (2024), 169272]. We carried out high-power tests at Nextef2, an X-band high-power test stand in KEK, for two such test cavities fabricated using hard pure-copper and copper-silver with the same electrical design. We report the results of the tests and postmortem...

18. Next Generation Low Level RF Control Automated for Breakdown Studies

Sophia Morton (SLAC, Stanford)

11/11/2026, 16:30

High Gradient RF Techniques

Oral presentation (onsite)

The radio frequency (RF) system on a chip (RFSOC) is a next generation low level RF board that integrates both direct RF sampling for data collection with local processing and algorithmic control with an FPGA for high precision RF outputs. The ability to directly sample RF inputs allows for local control of real-time frequency tuning and pulse shaping feedback of the RF output pulse. We use...

6. Short Pulse Driven Photogun for Bright Beams generation

Emilio Nanni (SLAC National Accelerator Laboratory)

11/11/2026, 16:50

High Gradient RF Techniques

Oral presentation (onsite or remote - not decided)

High gradient radio frequency (rf) driven photoguns are photoemission electron sources that have important applications for accelerator-based instruments, such as light sources and electron microscopy. Numerous efforts have been made to push for even higher field gradient while suppressing rf breakdowns. We propose the Compressed Ultrashort Pulse Injector Demonstrator, a 1.6 cell photogun...

34. Demonstration of an accelerating gradient of >50 MV/m on 650 MHz single cell cavities

Dr Vijay Chouhan (Fermilab)

1

High Gradient RF Techniques

Oral presentation (remote)

Achieving accelerating gradients in 650 MHz superconducting radio frequency (SRF) cavities is important for future high-performance accelerators. This work presents the RF performance of two single-cell 650 MHz niobium cavities processed using electropolishing procedures optimized for 650 MHz geometry and a low-temperature bake. Both cavities achieved accelerating gradients above 50 MV/m,...

36. Development of a DC Magnetron Sputtering System for Nb3Sn–I–Nb Multilayer Coating of SRF Cavities

ryo katayama (kek)

1

High Gradient RF Techniques

Oral presentation (onsite)

The maximum accelerating gradient, Eacc,max, of a superconducting radio- frequency (SRF) cavity is limited by the surface magnetic field at which a vortex avalanche occurs on the inner cavity surface. Theoretical studies predict that a superconducting–insulator–superconducting (S′–I–S) multilayer structure can effectively enhance the threshold field for vortex avalanche. Furthermore, an...

17. High Power RF Testing of High Temperature Superconductiors

Ankur Dhar (SLAC National Accelerator Lab)

1

High Gradient RF Techniques

Oral presentation (onsite)

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)....

14. Performance of 2-Step Baked Niobium Cavities for the ITN Cryomodule

Eric Viklund (KEK)

1

High Gradient RF Techniques

Oral presentation (onsite)

To support the ILC Technology Network(ITN) Cryomodule project at KEK, we have constructed and assembled six single cell cavities and one 9-cell cavity for vertical testing (VT). A series of surface treatment were applied to the cavities using the proposed recipe for the construction of the International Linear Collider (ILC). This recipe consists of four steps: bulk electropolishing (EP),...