News on PANDA ToF from ITEP (new mechanic design for DRPC based system) ITEP Russia-Panda meeting — April 26-28, 2010, ITEP(Moscow) Alexander Akindinov ITEP(Moscow)

Requirements for PANDA Small radius ~ 50 cm Minimal radiation length “Holes” for pellet target About 100 % coverage Strip design modules with plastic covers and chamber fixation

Our old design mm= 426 mm mm = 496 mm As we found out from current design of PANDA barrel 4 mm gap between detectors foreseen (space for service and installation structure + cabling and ect.) About 100% coverage Minimal material budget “Holes” for pellet target – to be done 56 identical modules in total 7 degree shift

Some open questions We have some ideas how to fix strips, but we need to know common support structure for DIRC and TOF From B. Lewandowski : “We have these 16 rectangular forms planned for quartz boxes. … It would be excellent, if you could start a design for the TOF in a way similar to the one for the DIRC quartz boxes, because the material of these two systems have to be as close as possible together to improve the situation for the EMC “. – As you can see TOF is as close to DIRC as possible, we’ll redesign our current drawings to 16 sectors, but we need some time. From C. Schwarz: “Is it possible to have a single layer and optimized housings covering approx. 90% of the geometrical acceptance?” – We can do this, but we have to check if PCB (1.2x1.2 m 2 ) with parameters we need can be produced. In this case design will be very similar to IHEP-Dubna project. Also we need to redesign chamber support and chamber placement (4 rows). We also can design 16 sector segmentation with two layers (strips in each sector fixed together mechanically) feedback from the other subdetectors &subsystems very important!!!!!

We got some information after March meeting(1) Information from BwECAL. Many thank to David Rodríguez Piñeiro for providing very useful information. We’ll keep this in mind Frame for services BwECAL and tracker coupling

We got some information after March meeting(2) Information from DIRC. Many thank to Carsten for providing very fast reply mm = 496 mm mm= 426 mm

Inputs for new design Inner radius – 426 mm (as for old one) Outer radius – 483 mm (one row?) 16 sectors as for the DIRC (!) We try in any case to have geometrical coverage as high as possible We think this is a very good idea, but how we can do this for one layer only? We can fit 4 strips in one gas volume to form sector and save space for at least 2 covers!

We had a very few time due to LHC start again… but we have already new design (not so detailed like old one but with very similar strips)

Old and new dimension

Segmentation for supermodule 3 strips sector is not fit very well with DIRC sector The best solution as for us.Two type for supermodule should be produced

Electronics and services H.V. PCB FEE Readout connectors FOPI supermodule

Summary Many thanks again for feedback from the other subdetectors!!!!! 1.New system design for barrel TOF was done. 2.We are now fit as well into space between tracker and DIRC. 3.We rearranged strips to have 16 sectors.(4 strips in one module preferred) 4. The aim is to have one side services and readout, but we need to produce PCB ASAP to confirm this!!! 5.New ROOT model will be done soon (fortunately not so many things to change) We will update our EDMS documents: and

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Strip design Zoom view for place of PCBs merging region 100 mm 1500 mm