Typical window applications are shown below:

 

 

 

Line focus

Point focus

 

 

 

 

Debye -

Scherrer camera

Powder

diffractometer

Guinier

camera

Texture

goniometer

 

 

 

Laue camera

Weissenberg camera

Precession camera

Reciprocal lattice explorer

3.6.CHANGING THE X-RAY TUBE

To change the X-ray tube, proceed as follows:

1. Switch off by pressing the GENERATOR 0 push-button. 2. Turn off the water supply.

3. Drain water from the instrument by opening the air inlet valve next to the water inlet and outlet connections, and wait until air has filled the system. Some water may run from the air inlet valve.

4. Loosen the two captive screws at opposite corners on the top of the tube shield. The X-ray tube should be removed by lifting upwards, when handling the X-ray tube take care to hold by the metal base and

!DO NOT TOUCH THE BERYLLIUM WINDOWS. These windows are thin, and can be poisonous to the skin. Do not remove the X-ray tube if generator operation has been switched off because of a failure

(safety circuit actuated) see Service section.

5. Select

the new tube and insert into the

tube

shield,

after first

checking the condition of the

“0” rings

for

the

water tubes. There is a locating

pin

on the

top of the

tube shield to ensure correct

positioning of

the tube. Tighten the two fixing screws.

 

 

 

 

 

NOTE:

The tube shield is designed to accept X-ray tubes with dimensions as figure 3.3. version A.

For other tubes a spacer ring, such as PW 1043, will be necessary when the dimension from the underside of the tube base to the centre of the tube base to the centre of the tube window exceeds 21 mm. Note that dimension "a" must not exceed 120 mm.

Fig. 3.3. X-ray tube dimensions.