1. Ferrara
MECHANICAL SUPPORT for forward tracking detectors Federico Evangelisti INFN - Ferrara
GSI – 2-6 march 2009

2. GSI – 2-6 march 2009 Federico Evangelisti
Ferrara
We have studied the mechanical support for the tracking stations DC5 and DC6.
DC6
DC5
(top view)
GSI – 2-6 march 2009
Federico Evangelisti

3. GSI – 2-6 march 2009 Federico Evangelisti
The support is composed of two principal parts:
main frame (shown in dark green);
straw tube module supports (drawers).
Ferrara
drawer
main frame
(DC6)
main frame
drawer
GSI – 2-6 march 2009
Federico Evangelisti

4. GSI – 2-6 march 2009 Federico Evangelisti
The main frame consists of a chassis realized with steel standard profiles:
IPE 240 (IPE UNI ) for the upper and lower horizontal supports;
HE 120 (HE UNI ) for the legs.
The structure is completely disassembled in order to facilitate the transport.
Ferrara
HE 120
IPE 240
HE 120
(DC6)
GSI – 2-6 march 2009
Federico Evangelisti

5. GSI – 2-6 march 2009 Federico Evangelisti
Ferrara
The straw tube wall is divided in two parts around the beam line.
Each half is, in its turn, divided in two parts (drawers).
On each drawer two layers are installed (vertical and tilting).
rails
Layer 1
Layer 2
(DC6)
Layer 3
left drawers
right drawers
Layer 4
(DC6 - side view)
front drawer
back drawer
GSI – 2-6 march 2009
Federico Evangelisti

6. GSI – 2-6 march 2009 Federico Evangelisti
Ferrara
telescopic rails
Every drawer is connected to the main frame with two telescopic rails.
RAILS CHARACTERISTICS:
closed length (L): 2000 mm
extension (D): 3000 mm
max load: 220 kg
weight: 86,2 kg
(DC6)
GSI – 2-6 march 2009
Federico Evangelisti

7. GSI – 2-6 march 2009 Federico Evangelisti
Ferrara
ASSEMBLY PROCEDURE
Pull out the drawer;
Put the modules on the drawer (vertical and tilting) like Cracow method ;
Straw tube module
(from J.Smyrski presentation GSI )
Put in the drawer.
GSI – 2-6 march 2009
Federico Evangelisti

8. GSI – 2-6 march 2009 Federico Evangelisti
MAIN FRAME DIMENSIONS AND DEFORMATIONS
Ferrara
max displacement in the middle: 3mm (DC6)(*)
ACTIVE AREA
ACTIVE AREA
Weight structure without straw tube modules:
DC6=1950 kg – DC5=1650 kg
Weight straw tube layers (signal wires and gas tubes included):
DC6=250 kg – DC5=200 kg
ACTIVE AREA
(*) structural verifications by Ing. V. Carassiti
GSI – 2-6 march 2009
Federico Evangelisti

9. GSI – 2-6 march 2009 Federico Evangelisti
Ferrara
drawer open
max displacement 5mm
GSI – 2-6 march 2009
Federico Evangelisti

10. GSI – 2-6 march 2009 Federico Evangelisti
Ferrara
UNDER INVESTIGATION
CONNECTIONS TUBES AROUND THE BEAM PIPE;
ALIGNMENT TO THE BEAM AXIS;
OTHER PROFILES AND MATERIALS IN ORDER TO MAKE THE STRUCTURE LIGHTER.
TO BE CHECKED
POSSIBILITY OF ASSEMBLY ON SUPPORT PLATFORM;
COMPATIBILITY OF THE DIMENSIONS WITH THE CLEARANCE BETWEEN MAGNET AND RICH FOR DC5 AND BETWEEN RICH AND EMC FOR DC6.
GSI – 2-6 march 2009
Federico Evangelisti

11. GSI – 2-6 march 2009 Federico Evangelisti
Ferrara
CONCLUSIONS
THE PROPOSED STRUCTURE HAS THE FOLLOWING ADVANTAGES:
IT IS INDEPENDENT FROM OTHER PARTS OF THE EXPERIMENT (DIPOLE MAGNET, RICH, EMC);
THE DRAWER METHOD MAKES IT EASIER TO MOUNT AND TO DISMOUNT STRAW TUBE MODULES;
FOR MAINTENANCE ON THE STRAW TUBE MODULES IT IS NOT NECESSARY TO REMOVE THE BEAM PIPE.
GSI – 2-6 march 2009
Federico Evangelisti