1. MECHANICS OF THE FORWARD STRAW TUBE TRACKER (preliminary) Federico Evangelisti INFN - Ferrara
GSI - 7/11 dicember 2009

2. We have studied the mechanical support and mounting method for the tracking stations DC5 and DC6.
(side view)
GSI - 7/11 dicember 2009
Federico Evangelisti

3. We have designed a support that includes both chambers.
DC6
DC5
DC5
DC6
(side view)
main frame
GSI - 7/11 dicember 2009
Federico Evangelisti

4. The support is mainly made in steel standard profiles.
The structure is completely disassembled in order to facilitate the transport.
main frame
GSI - 7/11 dicember 2009
Federico Evangelisti

5. In each chamber the straws plane is divided into two principal parts.
Every part is composed of two layers: on the first part there are a vertical layers, on the second there are a tilted (±5°) layers.
Part 1
(layer 1-2) with
vertical layers.
One layer in front and one in back.
Part 2
(layers 3-4) with
tilted layers.
One layer in front and one in back.
Layer 4
Layer 3
Layer 2
Layer 1
(side view)
GSI - 7/11 dicember 2009
Federico Evangelisti

6. Each part is divided in groups.
DC5 part 1) n.4 groups of 10 modules each + n.2 groups of 6 modules each;
part 2) n.4 groups of 10 modules each + n.2 groups of 6 modules each.
DC6 part 1) n.6 groups of 10 modules each + n.2 groups of 8 modules each;
part 2) n.6 groups of 10 modules each + n.2 groups of 8 modules each.
32 channels for module
DC5 group
10 modules – 5 per side
GSI - 7/11 dicember 2009
Federico Evangelisti

7. There are four rails for each chamber.
Each group is connected to the main frame trougth a linear rail/carriages system.
There are four rails for each chamber.
rail
carriages
rails
GSI - 7/11 dicember 2009
Federico Evangelisti
(side view)

8. TECHNICAL INFORMATIONS
GSI - 7/11 dicember 2009
Federico Evangelisti

9. ASSEMBLY PROCEDURE
Step 1) Put the modules on the group (vertical end tilted) like Crakow method;
(Cracow method from J.Smyrski presentation GSI )
(straw tube module)
(group)
GSI - 7/11 dicember 2009
Federico Evangelisti

10. + = Step 2) Fix the handle on the group; (handle) (group)
GSI - 7/11 dicember 2009
Federico Evangelisti

11. Step 3) Put the group on the mechanical support - put the carriages
in the rails;
Step 4) Connect groups with a connection flange;
connection flange
put carriage on the rails
(groups connected)
GSI - 7/11 dicember 2009
Federico Evangelisti

12. Step 6) Repeat all steps for all layers.
Step 5) Push all groups of modules in the center of the mechanical support around the beam pipe;
Step 6) Repeat all steps for all layers.
GSI - 7/11 dicember 2009
Federico Evangelisti

13. MAIN FRAME DIMENSIONS (in mm)
DC6 ACTIVE AREA
DC5 ACTIVE AREA
DC6 ACTIVE AREA
DC5 ACTIVE AREA
Weight structure without straw tube modules: 2500kg
ACTIVE AREAS
DC5 4045x1180
DC6 5984x1480
DC6 ACTIVE AREA
DC5 ACTIVE AREA
GSI - 7/11 dicember 2009
Federico Evangelisti

14. GROUP DIMENSIONS (in mm)
VERTICAL MODULE
TILTED MODULE
DC51600 – DC6 1900
DC51600 – DC6 1900
DC5 807 – DC6 807
DC5 931 – DC6 950
GSI - 7/11 dicember 2009
Federico Evangelisti

15. UNDER INVESTIGATION TO BE CHECKED
CONNECTIONS TUBES AROUND THE BEAM PIPE;
ALIGNMENT TO THE BEAM AXIS.
TO BE CHECKED
MECHANICAL DEFORMATION AND STABILITY (this is a preliminary design);
CONNECTIONS SUPPORT/PLATFORM.
GSI - 7/11 dicember 2009
Federico Evangelisti

16. CONCLUSIONS THE PROPOSED STRUCTURE HAS THE FOLLOWING ADVANTAGES:
THE MODULAR METHOD MAKES IT POSSIBLE TO MOUNT AND DISMOUNT STRAW TUBE MODULES IN EVERY MOMENT, INFACT THE SPACE NECESSARY FOR THESE OPERATIONS IS COMPATIBLE WITH EXPERIMENTAL HALL DIMENSIONS;
MAINTENANCE DOES NOT REQUIRE TO REMOVE THE BEAM PIPE.
GSI - 7/11 dicember 2009
Federico Evangelisti