A NEW HIGH - RESOLUTION POWDER DIFFRACTOMETER : G4.2

In the frame of a scientific agreement between the Petersburg Nuclear Physics Institute (P.N.P.I. / Russia) and Laboratory Léon-Brillouin (L.L.B. / France), a new high resolution powder diffractometer built in Gatchina, is being installed on the cold neutron guide G4 in G4.2..

This diffractometer has a focusing germanium monochromator (mosaïcity 20'), a take-off angle of 120-135°, and 70 3 He detectors (in 7 independent blocks of 10 detectors), covering an overall scattering angle range 20=152°.

It will work in three possible configurations :

Ge(115) : = 1.85 - 2.0A°, flux on the sample : 2 105n/cm2/s,

Ge(004) : = 2.4 - 2.6A°, flux on the sample : 5 105n/cm2/s,

Ge(113) : = 2.8 - 3.2A°, flux on the sample : 5 105n/cm2/s.

The optimum resolution d/d will be of the order of 1 to 2 10-3.

The diffractometer should be operational at the end of 1996.

2/3 of the beam time will be attributed by the LLB Round Tables (and the other 1/3 are reserved for Russian users).

For more information, please phone: 01-69-08-33-43.

              TO USERS OF THE EUROPEAN COMMUNITY

We have the pleasure to inform our European Community users that LLB has been selected as large facility in the frame of the new " Training and Mobility of Researchers (TMR) " Program.

Presently, the duration of the program is 3 years, starting from September 1st, 1996 (with some overlap with the Human Capital and Mobility Program, which for LLB ends on February 29th, 1997).

About 10% of the LLB beam time in 1997 will be taken in charge by this contract. Please indicate on the " Research Proposal " form if you wish that your experiment be taken in charge financially by TMR. The selection of proposals to be taken in charge by TMR will be made by the Selection Committee in the period 2-6 December 1996. The TMR Program will take in charge, for each selected experiment, travel and subsistence expenses for one or two non-national european union scientists (in the latter case, there must be at least one young researcher). French scientists can only be exceptionally taken in charge (European collaboration, new users, young researchers).

For more information, please phone: 01-69-08-54-17.