RSI Nameplate
  • Volume/Page
  • Keyword
  • DOI
  • Citation
  • Advanced
   
 
 
 

Flickr Twitter iResearch App Facebook

BROWSE VOLUMES

Year Range: 
Search Issue | RSS Feeds RSS
Previous Issue Next Issue

Apr 2012

Volume 83, Issue 4, Articles (04xxxx)

Issue Cover Spotlight Figure

Rev. Sci. Instrum. 83, 041101 (2012); http://dx.doi.org/10.1063/1.3697599 (19 pages)

Michael A. Duncan

The laser vaporization cluster source in the "cutaway" configuration. The sample rod is mounted from above with a flexible nylon screw in a holding block. The pulsed gas valve is mounted in the stainless steel can (left) and the skimmer is mounted on the opposite wall.

Enlarge Image | Read More
Return to All Sections
back to top
RSS Feeds
back to top Gravity; Geophysics; Astronomy and Astrophysics

Damping and local control of mirror suspensions for laser interferometric gravitational wave detectors

K. A. Strain and B. N. Shapiro

Rev. Sci. Instrum. 83, 044501 (2012); http://dx.doi.org/10.1063/1.4704459 (9 pages) | Cited 3 times

Online Publication Date: 18 April 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The mirrors of laser interferometric gravitational wave detectors hang from multi-stage suspensions. These support the optics against gravity while isolating them from external vibration. Thermal noise must be kept small so mechanical loss must be minimized and the resulting structure has high-Q resonances rigid-body modes, typically in the frequency range between about 0.3 Hz and 20 Hz. Operation of the interferometer requires these resonances to be damped. Active damping provides the design flexibility required to achieve rapid settling with low noise. In practice there is a compromise between sensor performance, and hence cost and complexity, and sophistication of the control algorithm. We introduce a novel approach which combines the new technique of modal damping with methods developed from those applied in GEO 600. This approach is predicted to meet the goals for damping and for noise performance set by the Advanced LIGO project.
Show PACS
04.80.Nn Gravitational wave detectors and experiments
07.10.Fq Vibration isolation
07.60.Ly Interferometers
42.79.Bh Lenses, prisms and mirrors
95.55.Ym Gravitational radiation detectors; mass spectrometers; and other instrumentation and techniques

Time-of-flight mass spectrometry of mineral volatilization: Toward direct composition analysis of shocked mineral vapor

Daniel E. Austin, Andy H. T. Shen, J. L. Beauchamp, and Thomas J. Ahrens

Rev. Sci. Instrum. 83, 044502 (2012); http://dx.doi.org/10.1063/1.4705745 (6 pages)

Online Publication Date: 25 April 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We have developed an orthogonal-acceleration time-of-flight mass spectrometer to study the volatiles produced when a mineral's shock-compressed state is isentropically released, as occurs when a shock wave, driven into the mineral by an impact, reflects upon reaching a free surface. The instrument is designed to use a gun or explosive-launched projectile as the source of the shock wave, impact onto a flange separating a poor vacuum and the high vacuum (10−7 Torr) interior of the mass spectrometer, and transmission of the shock wave through the flange to a mineral sample mounted on the high-vacuum side of the flange. The device extracts and analyzes the neutrals and ions produced from the shocked mineral prior to the possible occurrence of collateral instrument damage from the shock-inducing impact. The instrument has been tested using laser ablation of various mineral surfaces, and the resulting spectra are presented. Mass spectra are compared with theoretical distributions of molecular species, and with expected distributions from laser desorption.
Show PACS
82.80.Rt Time of flight mass spectrometry
61.80.Ba Ultraviolet, visible, and infrared radiation effects (including laser radiation)
82.40.Fp Shock wave initiated reactions, high-pressure chemistry
Return to All Sections
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close