Paper | Title | Other Keywords | Page |
---|---|---|---|
TU201 | Linac R&D for the ILC Technical Design Report | linac, cryomodule, linear-collider, cavity | 359 |
|
|||
The International Linear Collider (ILC) Technical Design Report (TDR) is scheduled for publication in 2012. The TDR will include an updated ILC baseline technical design description, results from critical R&D programs in support of key parameter choices, and one or more models for a Project Implementation Plan with an associated value estimate. The focus of linac R&D is to:
|
|||
|
|||
TUP021 | Digitally Controlled High Availability Power Supply | power-supply, controls, linear-collider, diagnostics | 437 |
|
|||
Funding: US DOE |
|||
TUP048 | Identifying Jitter Sources in the LCLS Linac | quadrupole, linac, klystron, pick-up | 506 |
|
|||
The beam stability for the Linac Coherent Light Source (LCLS) Free-Electron Laser (FEL) at Stanford Linear Accelerator Center (SLAC) are critical for X-Ray power, pointing, and timing stability. Studies of the transverse, longitudinal, and intensity stability of the electron beam are presented. Identifying these sources by different methods like correlations, frequency spectrum analysis and other methods is critical for finally eliminating or reducing them. |
|||
|
|||
TUP055 | Optimum Frequency and Gradient for the CLIC Main Linac Accelerating Structure | linac, luminosity, wakefield, accelerating-gradient | 527 |
|
|||
Recently the CLIC study has changed the operating frequency and accelerating gradient of the main linac from 30 GHz and 150 MV/m to 12 GHz and 100 MV/m, respectively. This major change of parameters has been driven by the results from a novel main linac optimization procedure. The procedure allows simultaneous optimization of operating frequency, accelerating gradient, and many other parameters of CLIC main linac. It takes into account both beam dynamics (BD) and high power rf constraints. BD constraints are related to emittance growth due to short- and long-range transverse wakefields. Rf constraints are related to rf breakdown and pulsed surface heating of the accelerating structure. The optimization figure of merit includes the power efficiency, measured as a ratio of luminosity to the input power as well as a quantity proportional to investment cost. |
|||
THP023 | Crab Cavities for Linear Colliders | cavity, dipole, beam-loading, linac | 830 |
|
|||
Crab cavities have been proposed for a wide number of accelerators and interest in crab cavities has recently increased after the successful operation of a pair of crab cavities in KEK-B. In particular crab cavities are required for both the ILC and CLIC linear colliders for bunch alignment. Consideration of bunch structure and size constraints favours a 3.9 GHz superconducting, multi-cell cavity as the ILC solution, whilst bunch structure and beam-loading considerations suggest an X-band copper travelling wave structure for CLIC. These two cavity solutions are very different in design but share complex design issues. Phase stabilisation, beam loading, wakefields and mode damping are special issues for these crab cavities. Requirements and potential design solutions will be discussed for both colliders. |
|||
THP053 | The Status of Nextef; The X-band Test Facility in KEK | klystron, linear-collider, controls, status | 906 |
|
|||
Nextef is a new X-band (11.4GHz) test facility in KEK. All of the key devices of this facility are from our old X-band Test Facility(XTF). By combining the power from two klystrons, 100 MW maximum X-band rf power is produced and 75MW is available in the bunker where the high power test of the high gradient accelerator structures will be done. The commissioning of the facility for the structure testing has almost done. The status of the facilityis is reported. |
|||
THP061 | High Power Test of a Low Group Velocity X-Band Accelerator Structure for CLIC | damping, vacuum, HOM, luminosity | 930 |
|
|||
In recent years evidence has been found that the maximum sustainable gradient in an accelerating structure depends on the rf power flow through the structure. The CLIC study group consequently designed a new prototype structure for CLIC with a very low group velocity, input power and average aperture (a/λ = 0.12). The 18 cell structure has a group velocity of 2.4% at the entrance and 1% at the last cell. Several of these structures have been made in collaboration between KEK, SLAC and CERN. A total of five brazed-disk structures and two quadrant structures have been made. The high power results of some of these structures are presented. The first KEK/SLAC built structure reached an unloaded gradient in excess of 100 MV/m at a pulse length of 230 ns with a breakdown rate below 10-6. The high-power testing was done using the NLCTA facility at SLAC. |
|||
THP090 | Marx Bank Technology for Accelerators and Colliders | high-voltage, controls, impedance, diagnostics | 1002 |
|
|||
Funding: U.S. Department of Energy SBIR Program |