ET44 status. 11-Apr-1995

To increase the acceptance for the tagged photoproduction events
towards the low y range (0.04<y<0.025) new electron calorimeters 
were proposed for installation at z=-38m and z=-188m [H1-09/94-383].

In order to check this proposal and to investigate the possibility 
to operate very close to the electron beam (~2-3 cm from the beam axis) 
a small ET-prototype was prepared and installed for 1995 running period.
The electron beam pipe was slightly modified around z=-44 m, to allow
the installation of small detector, which therefore got a name ET44.

The position of ET44 in HERA tunnel is sketched below.     
The calorimeter is built out of 6 KRS crystals of same type and size
as those used in the old Electron Tagger. The crystals with phototubes 
are housed into the antimagnetic iron box with thin (~2 mm) wall which is
close to the beampipe. 
The detector is mounted on a fixed support and is not remotely movable.

Sketch of the ET44 position in HERA tunnel

   Top view of the new tagger position together with front view of ET44
   at the right hand side.  Theta angle shown in sketch = 30 degrees.