sPHENIX tracking discussion

["Frawley, Anthony" <afrawley AT fsu.edu>]

Hi All,

Here are the minutes from the meeting this morning.

Cheers

Tony

Rachid Nouicer - Integration of the Silicon Pixels into sPHENIX
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Rachid presented the conclusions of a study to determine how to locate the ladders for both layers of reused PHENIX pixels in sPHENIX to get full coverage. The layout is done, the documentation is still to be completed.

Slide 18: There will be an extender that will carry the digital signals to the SPIRO board - not the highest priorityto add that right now.
The busses (which curl up in this picture as if they are in PHENIX) are flexible, and they can be brought down parallele to the beam pipe, where they will be connected to the extender.
Still neeed work on how to mount the SPIRO board., how long the extender can be made.
The plan is to start with the extender we have from PHENIX, and look for mechanical interference.

Gaku is working on getting the ladders into Geant. He is talking to Hubert about how to import the ladders. These results show where to put them in the simulation model.

Mike McCumber - MAPS progress update
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Mike reported that the MAPS prototype has been successfully read out at LANL. He showed pictures of the MAPS prototype carrier board and DAQ readout board set up on a desk at LANL. The MAPS sensor is on the small carrier board to the right. To the left is the DAQ board prototype. This is the real ALPIDE chip.

The sensor is connected to the board by wire bonding in the prototype. That is not the way it will be done in production.

In addition to Mike's list, there are 2-3 more carrier boards coming.
Can put them in telescope mode, can pass data between them.
This will allow playing around with trivial tracking, cosmic rays.
Will be possible to look at diffusion effects on hit smearing.
Thinking about radiation studies, want to start looking at latch-up.

ALICE is working on making the production an industrial process.
They have been pushing on the technique of a solder ball hit by a laser. They are having trouble getting the performance they need form that, and are considering other options, like conductive glue. Luciano had described this as a probable choke point. There are workable alternatives to explore.

Slide 2: What will be the goal of the physics/sim breakout group at the workshop next week?
Mike: What kind of full maps tracker do we want to make a C&S for?
Examples: Mike made a start on looking at a 6 layer tracker to save surface area. It looked quite good.
Another suggestion is: what if we made an exact copy of the ALICE ITS with the same layer radii, found funding to put in outer layer - what would be needed?

Tom Hemmick - TPC progress
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Tom presented a brief update on progress on the field cage. He showed pictures of the assembled wheels for the field cage mandrel!

What is the status of the space charge studies?  Carlos is on shift so was not at the meeting, but Tom said he has been in touch with Vanderbilt on the space charge simulations. Sourav said that Carlos and he have been working on optimizing the calculation. Hope for final space charge results in a few days.