The end stations

Photodiodes

The experimental chamber is equipped with 4 silicon diodes for light detection. All diodes are mounted on  a aluminum frame placed on the PhiA analyzer frame, at 160 mm from the chamber center. These detectors are all at 160 mm from the chamber center. 3 diodes are SXUV-100 model and one is AXUV-100G for absolute intensity measurements. Moreover, there is also an absolute diode AXUV-300 mounted on the monitor chamber for I0. The following table summarizes the main properties of the detectors:

Diodes properties

model	distance from center (mm)	mask size (mm2) V X H	Acceptance (H x V) deg2	Group/connection	Direct beam position
sxuv100	160 mm	8 x 8	7.6 x 7.6	A 2	ThetaA -50 PhiA 0
sxuv100	160 mm	8 x 0.5	7.6 x 0.5	B 1	ThetaA -119.6 PhiA +2
axuv100	160 mm	8 x 8	7.6 x 7.6	A 1	ThetaA -129.6 PhiA -2.5
sxuv100	160 mm	8 x 8	7.6 x 7.6	B 2	ThetaA -59.4 PhiA +2
axuv300	monitor chamber	20 x 20	------------	A 3	---------------------------

The diodes are connected through a DN63CF 8-ways feedthrough placed near the phiA motor.

 
Diodes mounted on PhiA frame


UHV feedthrough for photodiodes.