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

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

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

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

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

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

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)

TECHNICAL INFORMATIONS GSI - 7/11 dicember 2009 Federico Evangelisti

ASSEMBLY PROCEDURE Step 1) Put the modules on the group (vertical end tilted) like Crakow method; (Cracow method from J.Smyrski presentation GSI 8.12.08) (straw tube module) (group) GSI - 7/11 dicember 2009 Federico Evangelisti

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

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

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

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

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

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

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