scholarly journals High-heat-load studies of cryogenically internally cooled silicon double crystal monochromator above and away from cooling channels

2013 ◽  
Vol 425 (5) ◽  
pp. 052006
Author(s):  
N G Kujala ◽  
A T Macrander ◽  
M Ramanathan ◽  
E M Dufresne ◽  
G Navrotski ◽  
...  
Keyword(s):  
Heat Load ◽  
High Heat ◽  
Double Crystal ◽  
Cooling Channels ◽  
Double Crystal Monochromator ◽  
Internally Cooled ◽  
High Heat Load

scholarly journals Vibration measurements of high-heat-load monochromators for DESY PETRA III extension

2015 ◽  
Vol 22 (4) ◽  
pp. 879-885 ◽  
Author(s):  
Paw Kristiansen ◽  
Jan Horbach ◽  
Ralph Döhrmann ◽  
Joachim Heuer
Keyword(s):  
Measurement Techniques ◽  
High Heat ◽  
Direct Drive ◽  
Double Crystal ◽  
Relative Pitch ◽  
Double Crystal Monochromator ◽  
Synchrotron Beam ◽  
High Heat Load ◽  
Low Emittance

The requirement for vibrational stability of beamline optics continues to evolve rapidly to comply with the demands created by the improved brilliance of the third-generation low-emittance storage rings around the world. The challenge is to quantify the performance of the instrument before it is installed at the beamline. In this article, measurement techniques are presented that directly and accurately measure (i) the relative vibration between the two crystals of a double-crystal monochromator (DCM) and (ii) the absolute vibration of the second-crystal cage of a DCM. Excluding a synchrotron beam, the measurements are conducted underin situconditions, connected to a liquid-nitrogen cryocooler. The investigated DCM utilizes a direct-drive (no gearing) goniometer for the Bragg rotation. The main causes of the DCM vibration are found to be the servoing of the direct-drive goniometer and the flexibility in the crystal cage motion stages. It is found that the investigated DCM can offer relative pitch vibration down to 48 nrad RMS (capacitive sensors, 0–5 kHz bandwidth) and absolute pitch vibration down to 82 nrad RMS (laser interferometer, 0–50 kHz bandwidth), with the Bragg axis brake engaged.

Improved monochromator design for high heat load beamlines at CHESS (abstract)

1996 ◽  
Vol 67 (9) ◽  
pp. 3351-3351
Author(s):  
K.W. Smolenski ◽  
R. Pahl ◽  
P. Doing ◽  
C. Conolly ◽  
B. Clark ◽  
...  
Keyword(s):  
Heat Load ◽  
High Heat ◽  
High Heat Load

scholarly journals Simulated high heat load performance of an inclined crystal monochromator

1993 ◽  
Author(s):  
Albert T. Macrander ◽  
Ali M. Khounsary ◽  
Mark Graham
Keyword(s):  
Heat Load ◽  
High Heat ◽  
High Heat Load

Diamond channel-cut crystals for high-heat-load beam-multiplexing narrow-band X-ray monochromators

2021 ◽  
Vol 28 (6) ◽  
Author(s):  
Yuri Shvyd'ko ◽  
Sergey Terentyev ◽  
Vladimir Blank ◽  
Tomasz Kolodziej
Keyword(s):  
Heat Load ◽  
Narrow Band ◽  
Bragg Reflection ◽  
High Heat ◽  
High Repetition Rate ◽  
X Rays ◽  
Ray Optics ◽  
X Ray ◽  
Load Beam ◽  
High Heat Load

Next-generation high-brilliance X-ray photon sources call for new X-ray optics. Here we demonstrate the possibility of using monolithic diamond channel-cut crystals as high-heat-load beam-multiplexing narrow-band mechanically stable X-ray monochromators with high-power X-ray beams at cutting-edge high-repetition-rate X-ray free-electron laser (XFEL) facilities. The diamond channel-cut crystals fabricated and characterized in these studies are designed as two-bounce Bragg reflection monochromators directing 14.4 or 12.4 keV X-rays within a 15 meV bandwidth to 57Fe or 45Sc nuclear resonant scattering experiments, respectively. The crystal design allows out-of-band X-rays transmitted with minimal losses to alternative simultaneous experiments. Only ≲2% of the incident ∼100 W X-ray beam is absorbed in the 50 µm-thick first diamond crystal reflector, ensuring that the monochromator crystal is highly stable. Other X-ray optics applications of diamond channel-cut crystals are anticipated.

Innovative Realizations of High Heat-Flux Boiling and Condensing Flows for Milli-Meter and Micro-Meter Scale Applications

2014 ◽  
Author(s):  
Michael Kivisalu ◽  
Amitabh Narain ◽  
Patcharapol Gorgitrattanagul ◽  
Ranjeeth Naik
Keyword(s):  
Heat Flux ◽  
Heat Load ◽  
High Heat ◽  
Electronic Cooling ◽  
System Level ◽  
High Heat Flux ◽  
Zero Gravity ◽  
Pressure Drops ◽  
Condensing Flows ◽  
High Heat Load

For shear driven mm-scale flows, the traditional boiler and condenser operations pose serious problems of degraded performance (low heat-flux values, high pressure drops, and device-and-system level instabilities). The innovative devices are introduced for functionality and high heat load capabilities needed for shear dominated electronic cooling situations that arise in milli-meter scale operations, certain gravity-insensitive avionics-cooling and zero-gravity applications.

High heat load properties of high purity CVD tungsten

2002 ◽  
Vol 307-311 ◽  
pp. 735-738 ◽  
Author(s):  
S. Tamura ◽  
K. Tokunaga ◽  
N. Yoshida
Keyword(s):  
High Purity ◽  
Heat Load ◽  
High Heat ◽  
High Heat Load
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