Test of time dilation by laser spectroscopy on fast ions

2005 ◽  
Vol 83 (4) ◽  
pp. 425-434 ◽  
Author(s):  
G Saathoff ◽  
S Reinhardt ◽  
H Buhr ◽  
L A Carlson ◽  
D Schwalm ◽  
...  
Keyword(s):  
Ion Beam ◽  
Frequency Measurement ◽  
Heavy Ion ◽  
Time Dilation ◽  
Fast Ions ◽  
Relativistic Time ◽  
Ion Storage ◽  
Dilation Factor ◽  
Fast Ion ◽  
Laser Spectroscopic

The laser-spectroscopic frequency measurement of Doppler-shifted optical lines in the forward and backward directions of a fast ion beam permits a sensitive test of the relativistic Doppler formula and, hence, the relativistic time-dilation factor γSR = 1/[Formula: see text]. An experiment on 7Li+, stored at a velocity of v = 0.065c in the Heidelberg heavy-ion storage ring TSR, has confirmed time dilation with unprecedented accuracy limiting deviations to below 2.2 × 10–7. Ongoing improvements on the experimental setup will further tighten this limit.PACS Nos.: 03.30.+p, 06.30.Ft, and 42.62.Fi

Toward a New Test of the Relativistic Time Dilation Factor by Laser Spectroscopy of Fast Ions in a Storage Ring

2003 ◽  
Vol 146/147 (1-4) ◽  
pp. 71-75 ◽  
Author(s):  
G. Saathoff ◽  
U. Eisenbarth ◽  
S. Hannemann ◽  
I. Hoog ◽  
G. Huber ◽  
...  
Keyword(s):  
Laser Spectroscopy ◽  
Storage Ring ◽  
Time Dilation ◽  
Fast Ions ◽  
Relativistic Time ◽  
Dilation Factor

Ion beam preparation of 7Li+ for precision experiments at heavy ion storage rings

1997 ◽  
Vol 626 (1-2) ◽  
pp. 499-509 ◽  
Author(s):  
R. Grieser ◽  
P. Merz ◽  
G. Huber ◽  
V. Sebastian ◽  
P. Seelig ◽  
...  
Keyword(s):  
Ion Beam ◽  
Heavy Ion ◽  
Storage Rings ◽  
Ion Storage

scholarly journals Implementation of synthetic fast-ion loss detector and imaging heavy ion beam probe diagnostics in the 3D hybrid kinetic-MHD code MEGA

2021 ◽  
Vol 92 (4) ◽  
pp. 043558
Author(s):  
P. Oyola ◽  
J. Gonzalez-Martin ◽  
M. Garcia-Munoz ◽  
J. Galdon-Quiroga ◽  
G. Birkenmeier ◽  
...  
Keyword(s):  
Ion Beam ◽  
Heavy Ion ◽  
Probe Diagnostics ◽  
Heavy Ion Beam ◽  
Heavy Ion Beam Probe ◽  
Fast Ion

EXPERIMENTAL TESTS OF TIME DILATION IN SPECIAL RELATIVITY

2005 ◽  
Vol 20 (11) ◽  
pp. 791-805 ◽  
Author(s):  
GERALD GWINNER
Keyword(s):  
Standard Model ◽  
Special Relativity ◽  
Reference Frame ◽  
Experimental Tests ◽  
Heavy Ion ◽  
Time Dilation ◽  
Inertial Reference Frame ◽  
Ion Storage ◽  
The Standard Model ◽  
Sensitive Method

A review of experimental tests of time dilation in special relativity is given, with an emphasis on the recent heavy-ion storage-ring work, currently the most sensitive method. The experimental results are evaluated in the context of the kinematic test theories of Robertson and Mansouri and Sexl, which assume the existence of a preferred inertial reference frame. Prospects for future improvements and the sensitivity of time dilation experiments to Lorentz and CPT violating extensions of the standard model are discussed.

Cavity formation and plastic flow of a–Si: H during heavy ion bombardment

1991 ◽  
Vol 6 (10) ◽  
pp. 2109-2119 ◽  
Author(s):  
S. Klaumünzer ◽  
M. Rammensee ◽  
S. Löffler ◽  
H.C. Neitzert ◽  
G. Saemann-Ischenko
Keyword(s):  
Plastic Flow ◽  
Crystalline Silicon ◽  
Mass Density ◽  
Ion Beam ◽  
Heavy Ion ◽  
Oxide Glasses ◽  
Electronic Excitations ◽  
Fast Ions ◽  
Hydrogenated Amorphous ◽  
Fluence Range

Irradiation of unsupported samples of hydrogenated amorphous silicon below 100 K with 360-MeV Xe ions results in macroscopically visible changes in sample dimensions. These changes have two different causes. Formation and growth of cavities lead to an isotropic increase of the specimen dimensions and to a drastic decrease of the mass density. Simultaneously plastic flow occurs, which produces additional but anisotropic changes of the specimen dimensions. The dimensions perpendicular to the beam grow whereas the dimension parallel to the ion beam shrinks. Neither effect saturates in the investigated fluence range (Φt < 1014 Xe/cm2) and both are absent in crystalline silicon. The effects are most likely provoked by electronic excitations and/or ionizations in the wake of the fast ions. With respect to plastic flow, a–Si:H behaves like metallic and oxide glasses. Formation of cavities and their growth, however, seem to occur only in tetrahedrally coordinated solids.

Laser spectroscopic measurements of hyperfine structure in Pr II

2002 ◽  
Vol 80 (5) ◽  
pp. 557-562 ◽  
Author(s):  
R C Rivest ◽  
M R Izawa ◽  
S D Rosner ◽  
T J Scholl ◽  
G Wu ◽  
...  
Keyword(s):  
Hyperfine Structure ◽  
Laser Spectroscopy ◽  
Wavelength Range ◽  
Ion Beam ◽  
Elemental Abundance ◽  
Spectroscopic Measurements ◽  
Beam Laser ◽  
Hyperfine Constants ◽  
Fast Ion ◽  
Laser Spectroscopic

We have used fast-ion-beam laser spectroscopy to measure the hyperfine structure of 36 transitions in Pr II in the wavelength range 420–460 nm, obtaining the hyperfine constants of 8 odd-parity levels in the range 0–5079 cm–1 and 32 even-parity levels in the range 22 040–28 578 cm–1 with a typical accuracy of 0.2%. These will find useful application in stellar elemental abundance studies. PACS Nos.: 32.30-r, 32.10-f

Electron and ion irradiation-induced dissolution of mechanical twins in the intermetalic U3Si: An in situ HVEM study

1989 ◽  
Vol 47 ◽  
pp. 652-653
Author(s):  
Charles W. Allen ◽  
Robert C. Birtcher
Keyword(s):  
Elevated Temperatures ◽  
Ion Irradiation ◽  
Ion Beam ◽  
National Laboratory ◽  
Argonne National Laboratory ◽  
Heavy Ion ◽  
High Energy ◽  
Mechanical Twinning ◽  
In Situ Experiments

The uranium silicides, including U3Si, are under study as candidate low enrichment nuclear fuels. Ion beam simulations of the in-reactor behavior of such materials are performed because a similar damage structure can be produced in hours by energetic heavy ions which requires years in actual reactor tests. This contribution treats one aspect of the microstructural behavior of U3Si under high energy electron irradiation and low dose energetic heavy ion irradiation and is based on in situ experiments, performed at the HVEM-Tandem User Facility at Argonne National Laboratory. This Facility interfaces a 2 MV Tandem ion accelerator and a 0.6 MV ion implanter to a 1.2 MeV AEI high voltage electron microscope, which allows a wide variety of in situ ion beam experiments to be performed with simultaneous irradiation and electron microscopy or diffraction.At elevated temperatures, U3Si exhibits the ordered AuCu3 structure. On cooling below 1058 K, the intermetallic transforms, evidently martensitically, to a body-centered tetragonal structure (alternatively, the structure may be described as face-centered tetragonal, which would be fcc except for a 1 pet tetragonal distortion). Mechanical twinning accompanies the transformation; however, diferences between electron diffraction patterns from twinned and non-twinned martensite plates could not be distinguished.

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