Author archive: Barbara Warmbein

Linear developments

| 8 October 2009 The new group for linear collider detector development at CERN is less than a year old, but it is growing fast: a number of students and fellows are already working on simulations, and as of next year there will be funds for actual hardware development. The linear collider detector R&D group (LCD) is led by Lucie Linssen. As a group based at CERN, home of the Compact Linear Collider study CLIC, its main focus is on detectors that record the collisions that CLIC would produce. At three TeV these have a much higher energy than the 500-GeV collisions at the ILC, higher backgrounds and very different timing: whereas there are 340 nanoseconds between two particles bunches colliding in the ILC, at CLIC the plan is to have electron-positron collisions every half a nanosecond. Category: Feature | Tagged: ,

Cryomodule surpasses ILC gradient test

| 1 October 2009 A cryomodule prototype for the European XFEL has set the world gradient record for cryomodules built with superconducting radiofrequency technology, reaching an average accelerating gradient of more than 32 megavolts per metre (MV/m) in recent tests. This is an important step towards major goals set for the ILC’s Technical Design Phase (TDP), which include demonstrating system performance of fully fitted cryomodules like the record prototype. The accelerator module will be built into the FLASH free-electron laser at DESY, making it possible to increase the FLASH energy to 1.2 GeV. This means that even shorter wavelengths down to 4.5 nanometers will be available for experiments starting next year. Category: Around the World | Tagged: , ,

9 mA revisited

| 24 September 2009 The last two weeks were two of the most important (and intense) weeks for accelerator specialists working on the ILC. After a long period of preparation and a series of first tests, they have just finished a period of successfully running the superconducting linear accelerator FLASH at DESY under ILC-like conditions to demonstrate that a long train of electron bunches with high charge can be produced in and travel through the accelerator – and stay there, too. After the ILC-like run, which ended on Monday after long day and night shifts in the control room, FLASH will receive a major upgrade to improve capabilities and performance for the users of the laser light generated by FLASH. Category: Feature | Tagged: ,

Progress on ILC detectors

| 17 September 2009 ILD and SiD, two of the three detector concepts that submitted Letters of Intent, have been recommended for validation to Research Director Sakue Yamada by the International Detector Advisory Group (IDAG), chaired by Michel Davier. At their recent meeting in Hamburg, the ILC's Steering Committee endorsed the IDAG recommendations. This means that the R&D collaborations working on detector technologies and prototypes for the two ILC detector concepts ILD, the International Large Detector concept, and SiD, the Silicon Detector Design Study, will continue under full steam in their work towards the best design for detectors to understand collisions at the future ILC. The third detector concept that submitted an LOI, called '4th', was not validated. However, IDAG recommended that R&D on dual readout calorimetry done for 4th in a collaboration of many institutes should be supported in view of its potential for higher energy colliders. Category: Feature | Tagged: , , ,

From football field to field strengths

| 3 September 2009 It takes vision to be able to image the transformation of one thing into another. Take a football field, for example. What are your associations – running, competition, goals, fun? And now imagine you want to build a new accelerator. What would you use the field for? The European XFEL team at DESY did not have to reflect for very long: acceleration, competition, goals? An accelerator module test facility of course! It’s only a small step to the next vision: an accelerator module test facility for the ILC… Category: Around the World | Tagged: ,

Polarimeter on the electron stretcher

| 2 July 2009 Most collaborations who test their detector prototypes in a test beam want a well-defined stream of single particles into their setup so that they can test their equipment, alignment and software in order to cross-check it against the particle beam. Others want their setup bombarded to see whether it works – for example, the team around DESY's Jenny List, who design and build so-called polarimeters that measure the combined spin of the beams of electrons and positrons as they pass through before and after they have collided. (Read the info box for a more detailed description of a polarimeter or follow the link to learn more about polarisation.) Category: Around the World | Tagged: ,

Spiralling under control

| 11 June 2009 The team developing the ILC's positron source have every reason to be positive. Recent tests have shown both that the four-meter helical undulator prototype – a device that will produce an intense beam of polarised gamma rays – works in its cryomodule, and that the target that will produce the positrons themselves can reach its design rotation speed of 2000 revolutions per minute. Category: Feature | Tagged: , ,

“Well done, now do some more”

| 4 June 2009 A few weeks after the first big Accelerator Advisory Panel (AAP) review at the TILC09 meeting in Tsukuba, Japan, the panel has published its review results (see also the two most recent Director’s Corners on this topic). After two months of preparation, an intense week of presentations and another few weeks of writing up the results, the 13 members – ten ILC researchers and three from outside the linear collider world – presented a set of recommendations that intend to lead the ILC's most important areas of research and development to successful completion by the end of the Technical Design Phase (TDP) in late 2012. Category: Feature | Tagged: , ,

Writing the LOI is like ‘creating a painting’

| 14 May 2009 Some 400 pages of calculations, simulations, detector descriptions, estimates, some 1000 signatories from all round the world, hours spent on the phone or clustered around conference tables – a lot of hard work and careful thinking went into the Letters of Intent (LOI). Each of the three submitted letters – for ILD, for SiD and for the 4th concept or 4th for short – managed to meet the deadline, and even though they didn’t manage to stick to the recommended page limit of 100, they were all accepted and are being scrutinised by the international detector advisory group IDAG (see this week’s other feature). This is a story about how an LOI is written, as told by the authors and editors. Category: Feature | Tagged: , ,

Angels and Positrons

| 7 May 2009 Antimatter is likely to matter quite a lot in the next weeks. Hollywood has made its movie version of Dan Brown’s thriller Angels and Demons, directed by Ron Howard and starring Tom Hanks as Robert Langdon, and the film will hit cinemas around the world starting on 13 May. If you know the book you’ll know what ILC NewsLine has to do with it: it’s all about antimatter! Category: Feature | Tagged:
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