R2D2 fast overviewSept. 2014 version

This document is a short description of the R2D2 test beam line at the JEEPII reactor at IFE, Norway.

(Contact: Isabel Llamas Jansa)

Setup: main components

http://www.ife.no/en/ife/departments/physics/projects/r2d2

monochromator

JJ-X ray30’ collimator

He-3 beam monitor

JJ-X rayslit

Sample position

Detector position

JEEP IIreactor

JJ-X rayslit

Experimental area from above

http://www.ife.no/en/ife/departments/physics/projects/r2d2

Photo: Isabel Llamas

Description of movement

Horizontal translation and rotation of horizontal arm around top turning table axis.

Vertical translation of sample and rotation of detector’s table arm around bottom turning table axis.

Manual screw Jack to move plate where turning tables sit. Used for alignement.

The setup allows relative positioning of detector with respect to sample.

detector

sample

http://www.ife.no/en/ife/departments/physics/projects/r2d2

Photo: Isabel Llamas

Close up of setup with slits and neutron camera

http://www.ife.no/en/ife/departments/physics/projects/r2d2

Photo: Isabel Llamas

Beam properties

• The beam flux is of the order of 105 per s cm2 thermal neutrons.

• It comes from the reactor through a shutter with two opening positions: full open or Soller collimated.

• The collimator in the shutter is made of Cd layers and has a 36’ divergence.

• The beam is then monochromated by a composite Ge wafer monochromator,

• and exits the shielding at 90 degrees through a 30’ Gd Soller collimator inserted in a borated-polyethylene tube.

• Two JJ X-Ray IB-C80-AIR slits with borated aluminum blades are placed before the sample position.

0 23000 46000 69000 92000 1150001380001610001840000

100

200

300

400

500

600

Accessible wavelengths via rotation of the monochromator.

Beam

mon

itor /

cou

nts

per s

econ

d

Rotation Motor /steps

(400), 2Å

(511), 1.54Å

(911), 0.88Å

(711), 1.12Å (822), 0.94Å

Electronics and software • The setup is motor controlled using both commercial

and in-house software.

• Current NIM Modules include: Canberra high voltage power supplies 3106D, Canberra preamplifiers 2006, Canberra amplifiers 2022, Canberra single channel analyzers 2030.

• A MKS multi gas flow meter with a full scale of flow ranges (5 to 50000 sccm) and maximum inlet pressure of 10 bar is also available.

• An in-house LabView program is used for detector count acquisition. A CAEN digitizer with software in development is used to acquire PHS.

• A HDO4000 High Definition Oscilloscope from Teledyne Lecroy is also used.