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Author archive: Barbara Warmbein

FLASH under ILC charge – almost

| 6 November 2008 More than 1034 times per second per square centimetre — that’s how often electrons and positrons are supposed to collide in the ILC. The project’s accelerator experts have no doubts that it can be done, but they have to demonstrate it, too. An important proof is to run ILC-like beam conditions through a radiofrequency (RF) unit that consists of one klystron and 26 superconducting cavities housed in three cryomodules. Running ILC-like beam conditions means running the cavities at their gradient limits and with 800-microsecond beam pulses with an average current of about nine milliamperes (or mA). The FLASH accelerator at DESY is capable of approaching these ILC-like beam conditions, but they are at the design limits of the machine and are well beyond typical operating conditions. An international team with members from DESY, FNAL, SLAC, KEK, and Argonne have come together for a series of tests that wants to drive an ILC-like beam through FLASH. Category: Around the World | Tagged: ,

ILD community determines parameters for reference detector

| 2 October 2008 The scientists working on the International Large Detector concept ILD had met for the second time this year to discuss the set-up of their future masterpiece. The ILD group formed about a year ago from the former GLD and LDC detector concept groups. Both concepts had their plans for trackers, calorimeters and the detector set-up as a whole. Category: Around the World | Tagged:

First beam in the LHC

| 11 September 2008 Wednesday must have been one of the biggest days in science history. It certainly was the biggest day in particle physics for a long time coming - the first full beam around the LHC. The first protons completed the full circle at 10:28 am (less than an hour after first injection), and scientists in CERN's control rooms cheered and clapped, ran to the screens, pointed at monitors and breathed a massive, communal sigh of relief. Amazingly, after a cryogenic glitch around lunchtime, another first beam made its first full lap in the opposite direction at 15:03. The media centre in CERN's Globe was abuzz, French media had gathered in a Paris bar to follow the events, German press was connected via a multi-way videoconference and at Fermilab scientists and press watched in dressing gown and pyjamas. It was a picture-book start-up. Category: Feature | Tagged: ,

Thirty perfect cavities: liftoff!

| 4 September 2008 There are many official stages to a project financed by the European Commission – from call, proposal, negotiations, contract draft, start of work, annual reports to one of the most official events: the kick-off meeting. Europe's new flagship project on cavity production and exploration of international governance structures, ILC-HiGrade took this step last week. Representatives form all eight work packages were at DESY to present their objectives, their to-do lists and the milestones already achieved. Category: Around the World | Tagged: , ,

A welcome cage

| 28 August 2008 The international time projection chamber (TPC) team that works on R&D for future ILC detectors used to have a bit of a running gag. Somebody would proclaim that “the field cage will arrive next week” and everybody else would chuckle because week after week it didn’t arrive. Chuckling days are over now: after several years of planning the cage for the large TPC prototype, ordering it from industry, checking the quality, rejecting parts of the product and reordering, the nearly one-metre-long barrel with an inner diameter of 72 centimetres has finally arrived at DESY in Hamburg. First tests indicate that it will finally meet the team's high requirements. Category: Feature | Tagged: , , ,

ILC community meets at LCWS and ILC08

| 21 August 2008 Which is the right word to complete this series: KEK, Snowmass, Hamburg, ... ? Chicago of course! After the first three venues, the fourth General ILC Workshop (ILC08) will take place in Chicago this year, organised in conjunction with the 2008 Linear Collider Workshop LCWS. As in the past, the workshop is supposed to bring detector and accelerator communities together. Results and plans from both worlds will be discussed in several joint plenary sessions. Category: Feature | Tagged: , , , , ,

First cryomodule moves into NML

| 14 August 2008 Good news from an experimental hall at the edge of the prairie: Fermilab's ILC test area in the 'New Muon Lab' (NML) has just taken a major step towards completion with the installation of the first cryomodule on 6 August. Category: Around the World | Tagged: , ,

ECFA meets at DESY

| 31 July 2008 In their meeting a couple of days ago at DESY, ECFA, the European Committee for Future Accelerators, got a complete update on all present and future particle physics activities in Europe. They also discussed the ILC and its potential: “We think it is important to remember that particle physics in Europe is more than the LHC,” says the current ECFA chair Karlheinz Meier from Heidelberg university in Germany. “The community has to plan now, gather facts and lay foundations for future projects, and the ILC is a very good example for this.” Category: Around the World | Tagged: ,

Time to recover

| 31 July 2008 In a linear accelerator, energy conservation is not really on the achievement list. To get up to the required luminosity, accelerator experts have one chance to push the particle beams to their limits, putting much energy into the bunches, correcting, scraping and tweaking them along the way only to smash them into each other and direct the straggly remains into a dump. Not so an Energy Recovery Linac, currently at the design and first prototype stage at Cornell University. The electron beams also get dumped after one run, but before that happens, they are tricked into handing over their energy back to the superconducting machine that accelerated them. Category: Feature | Tagged: , , , , , ,

Damping starts this week

| 10 July 2008 There may not have been a ribbon-cutting ceremony or speeches by heads of state. But the official kick-off of Cornell University's CESR storage ring as ILC damping ring test facility pleased the nearly 40 participants at this week's "Joint CesrTA Kickoff Meeting and ILC Damping Rings R&D Workshop (ILCDR08)" enormously. “CesrTA will give us a detailed picture of the how electron cloud builds up under a range of conditions, of how an ultra-low emittance positron beam interacts with the electron cloud, and of how beam instabilities driven by the electron cloud develop,” says Andy Wolski, damping ring group leader based at the Cockcroft Institute in the UK. “In this respect CesrTA plays a critical role in validating the decision to reduce costs by eliminating the second positron damping ring.” Category: Around the World | Tagged: , , ,
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