MAX IV becomes the first synchrotron to successfully trial neon venting from CERN

The vacuum chambers of MAXIV are only 22 mm of diameter; the chamber size was chosen in order to fit inside the compact magnets of the storage ring. Due to the small diameter of the chamber, the conventional way of pumping using lumped pumps is not efficient nor practical, accordingly, the vacuum system of the 3 GeV storage ring is fully NEG (non-evaporable getter) coated vacuum system.
NEG coating provides the needed pumping and reduces the outgassing due to the photons hitting the chamber walls. For NEG coating to be pumping down it should be activated, activation means that the coating should be heated up to around 200˚C, consequently, any venting to atmosphere will cause the NEG coating to be saturated (can not pump) and should be followed with NEG activation to restore the coating performance. At MAX IV, in order to activate the NEG coating, a major intervention is needed, where the whole achromat (23 m) should be lifted and heated up inside an oven. Such an intervention would last from 2 weeks (if the achromat does not have insertion devices) up to 4 weeks (for achromats with insertion devices).

>Read more on the MAX IV Laboratory website

 

Berkeley Lab delivers injector that will drive X-Ray laser upgrade

Unique device will create bunches of electrons to stimulate million-per-second X-ray pulses

 

Every powerful X-ray pulse produced for experiments at a next-generation laser project, now under construction, will start with a “spark” – a burst of electrons emitted when a pulse of ultraviolet light strikes a 1-millimeter-wide spot on a specially coated surface.

A team at the U.S. Department of Energy’s Lawrence Berkeley National Laboratory (Berkeley Lab) designed and built a unique version of a device, called an injector gun, that can produce a steady stream of these electron bunches that will ultimately be used to produce brilliant X-ray laser pulses at a rapid-fire rate of up to 1 million per second.

The injector arrived Jan. 22 at SLAC National Accelerator Laboratory (SLAC) in Menlo Park, California, the site of the Linac Coherent Light Source II (LCLS-II), an X-ray free-electron laser project.

Getting up to speed

The injector will be one of the first operating pieces of the new X-ray laser. Initial testing of the injector will begin shortly after its installation.

The injector will feed electron bunches into a superconducting particle accelerator that must be supercooled to extremely low temperatures to conduct electricity with nearly zero loss. The accelerated electron bunches will then be used to produce X-ray laser pulses.

>Read more on the Advanced Light Source website

 Image: Joe Wallig, left, a mechanical engineering associate, and Brian Reynolds, a mechanical technician, work on the final assembly of the LCLS-II injector gun in a specially designed clean room at Berkeley Lab in August.
Credit: Marilyn Chung/Berkeley Lab

Superconducting X-Ray laser takes shape in Silicon Valley

The first cryomodule has arrived at SLAC

Linked together and chilled to nearly absolute zero, 37 of these segments will accelerate electrons to almost the speed of light and power an upgrade to the nation’s only X-ray free-electron laser facility.

An area known for high-tech gadgets and innovation will soon be home to an advanced superconducting X-ray laser that stretches 3 miles in length, built by a collaboration of national laboratories. On January 19, the first section of the machine’s new accelerator arrived by truck at SLAC National Accelerator Laboratory in Menlo Park after a cross-country journey that began in Batavia, Illinois, at Fermi National Accelerator Laboratory.

These 40-foot-long sections, called cryomodules, are building blocks for a major upgrade called LCLS-II that will amplify the performance of the lab’s X-ray free-electron laser, the Linac Coherent Light Source (LCLS).

 

>Read more on the Linac Coherent Light Source website

Photo credit: Fermilab / Jefferson Lab