ILC NewsLine
Around the World
US-manufactured cavity achieves high gradient

Damon Bice, a Fermilab technician studying at JLab for the year, disassembles the AES2 cavity from the test stand for another round of electropolishing and vertical tests. (Image courtesy of JLab)
Turkey, stuffing and pumpkin pie – all things you might appreciate on Thanksgiving. ILC scientists in the United States had something extra to be thankful for this year. On 21 November, the day before the Thanksgiving holiday in the US, a superconducting cavity manufactured by Advanced Energy Systems in Medford, NY, reached a high gradient of 32.6 megavolts per metre (MV/m) at Jefferson Laboratory. “This is the first US-built ILC nine-cell cavity to reach a gradient close to the ILC specification,” said Rongli Geng, the lead scientist at JLab on the nine-cell high-gradient cavity processing R&D. JLab scientists are hopeful that the cavity, dubbed AES2, will reach an even higher gradient after further processing.

-- Elizabeth Clements


Upcoming meetings, conferences, workshops

Wake Fest 07
11-13 December 2007

LET Beam Dynamics Workshop
11-13 December 2007

3rd Mini-Workshop on ILC Damping Rings R&D
18-20 December 2007

Fifth ATF2 Project Meeting
19-21 December 2007

ILD Workshop
DESY, Zeuthen, Germany
14-16 January 2008

Tesla Technology Collaboration Meeting
DESY, Hamburg
14-17 January 2008

Joint ACFA Physics and Detector Workshop and (GDE meeting) on International Linear Collider

3-6 March 2008

Upcoming schools

US Particle Accelerator School
UC at Santa Cruz
14-25 January 2008

= Collaboration-wide Meetings

GDE Meetings calendar

View complete ILC calendar

Feature Story
ILC challenges materials science

Cut of niobium sheet: Only well recrystallised niobium can successfully be formed to a cavity shape. (Photo: CEA)
Physicists and engineers already know most of the empirical recipes to build very good accelerating cavities: highly pure niobium is essential, welding needs to be carefully controlled and surfaces undergo advanced cleaning and annealing procedures. But, as for every complex system, a lot of phenomena remain unexplained. The theoretical limits of RF superconductivity are not well known, and engineers also meet practical limitations to reach high gradients. Accelerator experts work very closely with material scientists to understand cavity properties better.

-- Perrine Royole-Degieux

Image of the Week
In the picture

No dumbbells or weight bars were involved when 17 participants met at DESY last week for the very first ‘power training’ for the Engineering Data Management System. The participants, coming from all three ILC regions, learned all about the online system that lets you handle Computer-Aided Design (CAD) applications, track versions, design, edit, link, tag and publish. Experts on CAD worked with experts on electronic data handling, learning about what the others need and what they have on offer. They are now trainers for their regions and can organise their own power training sessions.
In the News
From nature physics 3, 823
December 2007
Closed circle
CERN's latest accelerator is taking shape

From Daily News and Analysis India
28 November 2007
Industry should benefit from tie ups in int'l projects
MUMBAI: Indian industry should take advantange of the country's involvement in prestigious international projects like ITER and work with top scientific institutions to meet the huge demand for ultra vacuum systems, S Banerjee, Director of Bhabha Atomic Research Centre said here on Wednesday.
Director's Corner
China prepares for a new generation of tau-charm physics

Wang Yifang, Associate Director and Director of the Center for Experimental Physics of IHEP, dedicating the inserted drift chamber (on the left).
The BEPC accelerator and BES detector facility are the centerpieces of the Institute of High Energy Physics in Beijing. These ambitious state-of-the-art facilities act as the follow-on to the pioneering studies at SPEAR of tau and charm physics. During the International Linear Collider CCAST workshop at IHEP last month, we had a tour of the accelerator facility and by fortuitous timing, we joined in their celebration of achieving a major milestone for the BES detector: the successful installation of the central drift chamber. The upgraded accelerator and detector at IHEP promise to produce important tau-charm physics, as well as to train a new generation of particle and accelerator physicists. The development of particle physics over the past decade at IHEP and its participation in the global particle physics programme put China in a position to be an important player in the next generation of particle physics experiments, including Daya Bay neutrinos, the Large Hadron Collider and the ILC.

-- Barry Barish

Director's Corner Archive

What is it?

These colourful lines we asked you to identify last week are of course RF signals on a cavity. Congratulations to Stuart Henderson (Oak Ridge National Lab), Matthias Felber and Alexander Gamp (both DESY) who all got it right! Read the full explanation from KEK here.

Register for TILC08
Registration is now open for the next collaboration-wide meeting. The joint GDE and ACFA Physics and Detector Workshop will be held in Sendai, Japan, from 3 to 6 March 2008.
More information

ILC Notes
Readout Inefficiency due to Finite Buffering

Leak rate measurements on bimetallic transition samples for ILC cryomodules

Leak rate measurements on bimetallic transition samples for ILC cryomodules

Radiolysis in the ILC Main Beam Dumps

arXiv preprints
The charged Higgs boson mass in the 2HDM: decoupling and CP violation

Seesaw at Collider, Lepton Asymmetry and Singlet Scalar Dark Matter

Disentangling the Unparticles with polarized beams at e+e- colliders

Two Higgs Models for Large Tan Beta and Heavy Second Higgs