ERL overview - SLACPortalWelcomePage

ERL overview - SLACPortalWelcomePage

Summary Report Working Group 7: Undulators, Beamlines, X-ray Optics, and X-ray Detectors Conveners: Don Bilderback (Cornell U.) Chris J. Jacobsen (ANL) Working Group 7 Summary for FLS 2010 ICFA Beam Dynamics Workshop, SLAC , March 1-5, 2010 Slide 1 of 23 General Remarks

Highlight where to put emphasis on development Interesting directions for future light sources to take General category is improving instrumentation at present and future light sources In many cases (undulators, x-ray detectors, x-ray optics) the development cycle is lengthy, of order 5 to 10 years for something that works on new principle

The developments are costly and time-consuming and depend on steady support for students, staff and capital funding to build up a new effort. Its important that the developer become an end user for period of time to get the most out of the development Our group didnt explicitly discuss APS and ESRF upgrade programs to undulators, optics, detectors, etc. but they are clearly warranted. Most of the time we discussed new efforts or substantial extensions of present efforts. Working Group 7 Summary for FLS 2010 ICFA Beam Dynamics Workshop, SLAC , March 1-5, 2010 Slide 2 of 23 Intro to Und Working Group 7 Summary for FLS 2010 ICFA Beam Dynamics Workshop, SLAC , March 1-5, 2010 Slide 3 of 23

Summary of SC und types 1 to 10 mm period possible by lithography Working Group 7 Summary for FLS 2010 ICFA Beam Dynamics Workshop, SLAC , March 1-5, 2010 Slide 4 of 23 Und Summary Working Group 7 Summary for FLS 2010 ICFA Beam Dynamics Workshop, SLAC , March 1-5, 2010 Slide 5 of 23 SC Undulators

Strength: Achieves the highest magnet fields Many users desire polarization control possible with right design Novel ideas Passive shimming Can period double with switches is this an advantage? HTS can be printed by lithography and appear useful particularly for small gap, short period undulators. Periods from 1 to 10 mm appear possible

Questions: - How good is the metrology on miniature devices i.e. few mm gaps with few mm periods? Everything contracts with cooling. Will the parts thermal cycle reproducibly each time upon cooling, to to preserve delta k/k of .0001 for XFEL? - Will SC devices turn out to be favorable for FEL applications? - Can someone compare tolerance requirements between SC and PM technologies? - Can metrologies for cold SC undulators compete with PM technologies at room temperature? Working Group 7 Summary for FLS 2010 ICFA Beam Dynamics Workshop, SLAC , March 1-5, 2010 Slide 6 of 23

Sasha Working Group 7 Summary for FLS 2010 ICFA Beam Dynamics Workshop, SLAC , March 1-5, 2010 Slide 7 of 23 Delta Undulator Questions:

Will the magnets around the electron beam be radiation damaged over time? Can vacuum pressure be low enough for long-term operations? What has to be done to prevent the opening cone of radiation from striking the inner wall before the radiation leaves the device? How to pick up image currents on inner surfaces when electron beam passes through? How amenable is scaling of a 30 cm long prototype to 25 meters (in segments)? Working Group 7 Summary for FLS 2010 ICFA Beam Dynamics Workshop, SLAC , March 1-5, 2010 Slide 8 of 23 Crossed Undulators

Working Group 7 Summary for FLS 2010 ICFA Beam Dynamics Workshop, SLAC , March 1-5, 2010 Slide 9 of 23 Further Undulator Comments

Large diversity of undulator devices, and more development is underway Highly dependent on your local experts Very materials dependent Configuration depends on the application In the long run, the community is very sensitive to costs for development, manufacturing, metrology and maintenance Need to continue to push for smaller, cheaper, and faster directions Some further issues for development? Wakes, thermal management of HOM power deposited, radiation damage (Touschek effect) for highest density electron beams, etc. Still plenty of room for improvement for future accelerators.

Working Group 7 Summary for FLS 2010 ICFA Beam Dynamics Workshop, SLAC , March 1-5, 2010 Slide 10 of 23 LCLS Undulators Present undulators with large period a great success! H-D comments: Beam-based alignment Pick & choose your error budget Many years to design, build and measure a new device

Working Group 7 Summary for FLS 2010 ICFA Beam Dynamics Workshop, SLAC , March 1-5, 2010 Slide 11 of 23 LCLS Coherent X-ray Imaging program Pad Detector Working Group 7 Summary for FLS 2010 ICFA Beam Dynamics Workshop, SLAC , March 1-5, 2010 Slide 12 of 23 Pda Technology Going? Working Group 7 Summary for FLS 2010 ICFA Beam Dynamics Workshop, SLAC , March 1-5, 2010 Slide 13 of 23 Fast Readout CCD

Working Group 7 Summary for FLS 2010 ICFA Beam Dynamics Workshop, SLAC , March 1-5, 2010 Slide 14 of 23 CCD Rapid-readout Advances 100 frames/sec 48 readout channels with custom ASICs for higher level integration Resolve Laue diffraction overlaps at very low count rates Problems handling lots (Tbytes) of streaming data R&D: integrate 1k frame storage registers (good for continuous readout)

FemtoPix design for cyclic measurements ( 2 kHz laser on, 2 kHz laser off) Cut 2 mm hole in the middle Go to Silicon-on-Insulator technology to integrate sensor and readout on same chip (skip bump bonding) Working Group 7 Summary for FLS 2010 ICFA Beam Dynamics Workshop, SLAC , March 1-5, 2010 Slide 15 of 23 CFEL Detector Working Group 7 Summary for FLS 2010 ICFA Beam Dynamics Workshop, SLAC , March 1-5, 2010 Slide 16 of 23 CFEL specs

Working Group 7 Summary for FLS 2010 ICFA Beam Dynamics Workshop, SLAC , March 1-5, 2010 Slide 17 of 23 Detector Frontiers

Fabrication methods keep improving with time New experimental ideas appear every year. Can you make 4-side buttable smaller modules that tile to large arrays? Every several years, new detector capabilities appear Totally new designs take many years to go through design, fabrication & testing Very important to the effort to use hot beams from new sources Radiation damage issues for some sensors Lots of data to handle How much does it cost to have frontier x-ray detectors? Will they ever be commercialized?

Who will be able to afford the large scale development required? Who will maintain and service the detectors? Working Group 7 Summary for FLS 2010 ICFA Beam Dynamics Workshop, SLAC , March 1-5, 2010 Slide 18 of 23 Optics: the limits of the Possible (jointly with WG1)

Not a big part of the talks we had, but many important issues Race to make very small diameter soft and hard x-ray beams in the 1 to 50 nm size with various technologies (zone plate, refractive lenses, KB mirrors, adaptive multilayers, Laue lenses) Recent multilayer mirror with adaptive optics focused to 7 nm size (1d). Lots of improvements with time! Issues of coherence preservation, heat loading, radiation damage, etc. Stacking of zone plates to increase hard x-ray efficiency Laue lenses have reach 16 nm 1d line width at 20 keV Not discussed, but particularly important: slope errors in crystals and

mirrors to 10 to 300 nrad levels. Stability to 10 nrad for XFELO optics is required. Vibration control is very important Working Group 7 Summary for FLS 2010 ICFA Beam Dynamics Workshop, SLAC , March 1-5, 2010 Slide 19 of 23 JLamp Big Feature Michael Klopf, Jlab Working Group 7 Summary for FLS 2010 ICFA Beam Dynamics Workshop, SLAC , March 1-5, 2010 Slide 20 of 23 JLamp Optics and Experimental Issues

Damage on first optical element to be managed (thermal management), chemical or reaction damage, carbon coating, ablation from peak power, thermal fatigue, etc. Cryo-cooled sapphire mirrors planned for enhanced heat transfer Will optics preserve spatial and temporal coherence? Higher harmonics in the SR beam a problem, users dont want

them Source point moves longitudinally (depending on the lasing conditions) thus the focused optical beam moves with changing conditions Working Group 7 Summary for FLS 2010 ICFA Beam Dynamics Workshop, SLAC , March 1-5, 2010 Slide 21 of 23 Don talk Don Bilderback talk Working Group 7 Summary for FLS 2010 ICFA Beam Dynamics Workshop, SLAC , March 1-5, 2010 Slide 22 of 23 Novel Measurements Enabled by a CW Source

Joel D. Brock Cornell University Fluorescence Correlation Spectroscopy (FCS), Fluorescence Confocal Microscopy (FCM), and Multi-photon Fluorescence Microscopy (MPM) are all standard techniques with visible light. In contrast to FCS and FCM which have been developed in the X-ray, MPM has not. The high spectral brightness of the ERL may enable two-photon resonant absorption in the focal volume. This would enable element specific imaging in optically opaque samples with the spatial resolution set by the focal volume. Multi-photon ionization with lasers strips off valence electrons. In contrast, multi-photon ionization with x-rays strips off core electrons. The resulting phenomena are quite rich (photo, Auger, 2photon/2-electron, sequential, and correlated ionization). The suggestion here is to use particle-particle (i.e., electron-electron) coincidence measurements to find the needle in the haystack. CW sources are ideally suited for coincidence studies due to the true-to-false ratio for coincidence

measurements. Ref: Parametric down conversion (Eisenberger & McCall, 1971 on Be with Mo x-ray tube, counts per month Working Group 7 Summary for FLS 2010 ICFA Beam Dynamics Workshop, SLAC , March 1-5, 2010 Slide 23 of 23

Recently Viewed Presentations

  • Best revision resource? Describe Maths in one word.

    Best revision resource? Describe Maths in one word.

    Billy Adamson 11A5 "Describe Maths . in one word." "What made . Maths stick?" Songs, notes bingo, teachers, Revision cards, qwizdom. Stimulating. Photo here "What advice would you give to yourself if you could start over again?" "Best revision resource?"...
  • Title 1

    Title 1

    CS @ VT ©2005-2019 WD McQuain. Creating an Array Dynamically . The second way to create an array variable involves . dynamic allocation. That is, the desired dimension is unknown until the program is being executed.
  • Cold War CLOZE Notes 1 Soviets in WWII

    Cold War CLOZE Notes 1 Soviets in WWII

    At the end of WWII, the Allies divided Germany into 4 sections to keep it from regaining power. US, Great Britain, France, & Soviet Union each controlled a section. In 1948, the Western Allies wanted to reunite Germany, but the...
  • Presentación de PowerPoint

    Presentación de PowerPoint

    Además su diseño responsive permite una perfecta visualización tanto en dispositivos de mesa como en dispositivos móviles. Como nuestro objetivo es crear comunidad en Medios Sociales sugeriría revisar los íconos de Redes Sociales porque actualmente no redirigen a sus perfiles...
  • STUDY GUIDE Wave Properties, Interactions, and Sound Waves

    STUDY GUIDE Wave Properties, Interactions, and Sound Waves

    Remember the old western movies- ear to the ground vs. listening to the air. How does amplitude affect sound? If affects how loud the sound is. Higher amplitude = louder sound ... After a rain shower light waves pass through...
  • What is the Alarm Handler? - EPICS

    What is the Alarm Handler? - EPICS

    The Mask settings can include any or all of the following: Cancel - If set, the ioc will no longer send alarm information to the alh on this channel Disable - The alh will not beep or display alarms from...
  • Census Bureau Data on the Social Determinants of

    Census Bureau Data on the Social Determinants of

    SIPP is a longitudinal survey that collects information on topics such as poverty, income, employment, and health insurance coverage. The strength of SIPP is its measurement of transitions on and off programs, churning in the labor force, as well as...
  • Tying it all together: the major causes of wwi

    Tying it all together: the major causes of wwi

    In order to fuel this idea of national superiority, European powers built up their militaries, looked to expand their empires, and sought exuberant amounts of wealth/resources. Also fueled by propaganda, literature, and other mass media. All this chest-pounding led to...