MEC Session at CM 21/3

Europe/Berlin

Minutes MEC Session at CM 21/3, Tuesday Oct 26, 11-13h

A. Derichs, Constructive Operational Safety on the STT Detector

Two versions of mock-ups of the STT on-detector FE electronics to study the cooling with air were presented. The first version included the old size of the FE boards, the second one the smaller final size of the latest FE board design. Each dummy board had resistors to mimic the realistic power consumption. The smaller boards allow well for space needed for cabling in the readout volume. The whole readout volume was enclosed and supplied with an air stream for cooling. With this new version a temperature of 40°C could be reached with a realistic air flow of 100 l/min for the half STT barrel.

Further design work regarded the STT cable channel where all services like gas, HV, LV and signals are routed. A prototype made with 0.5mm thick Aluminum covers was produced. The space is sufficient to route all services. Furthermore the routing of the gas pipes between service channel and straw layers was optimised.


S. Koch, Mounting device for Forward Endcap installation

A first detailed design of the installation device for the forward endcap EMC was presented. The device attaches to 8 thread holes of size M16 present at the backplate of the FEC EMC for fixation. The load of the EMC has to be supported on two locations on 45° holding plates. The installation device consists of four parts, the base frame, the lifting frame, the console and two grippers left and right. The base frame is fixed to precision rails with rollers that allow forces both in up and down directions to allow for the cantilever operation of the installation device. The lifting frame allows for the vertical adjustment. The console holds the FEC EMC and can be adjusted with three spindles in 3 dimensions. The gripper flips up from below to hold the weight and releases it when in the system is installed in its place. With a different console the device shall be also employed for the installation of the GEM tracker.


J. Lühning, PANDA Beamline Update

The work presented regards the integration of the beampipe of HESR in PANDA along all its sections. At FZ Jülich the prototyping and design of the vacuum system itself are done. A first prototype of the target-beam cross made from Aluminum was done featuring an optimised cross section of a conical pipe with a straight pipe. The real pipe will be done from Titanium. There are four places that have to be opened when the TS and FS platform are moving to the maintenance position. Further flanges are interfacing the cryo-pump section at the rear, the pumping port between FT1 and FT2 and the vacuum of the Luminosity Detector in the very front. Details of the design of the pumping port between FT1 and FT2 were shown. Tolerances are very tight, but a small modifiction of the connection of FE boards may release some more space. A further point of discussion is the design of flange connection either as standard CF flanges, chain-like QCF flanges or an individual horse-shoe design.


D. Glaab, Design changes on gas tank fundament, room E40.310_&_adaptions inside the MVD-Pit

The first part of the presentation covered the necessary changes to the service routing and civil construction parts regarding the cryogenic infrastructure for PANDA. At the outside of the hall a foundation will hold two large vertical tanks, one for liquid nitrogen, the other for gaseous helium. The liquid nitrogen will be used to cool gaseous helium from inside the cryogenic system of the PANDA Solenoid at the parking position via a heat exchanger. This allows to keep the temperature of the shield and SC coil of the magnet below 100 K at all times to avoid mechanical stress. The evaporating nitrogen generated in this process can be used to flush detectors. This is needed for keeping gaseous detectors clean during the shutdown period and to keep the volumes of the TS EMC and the Barrel DIRC in a dry atmosphere. A second component is an evaporator operated for the generation of gaseous nitrogen when the Solenoid is in its operating position. The foundation of the gas tanks has to be enlarged to host also the heat exchanger and the evaporator. The inventory placement of the Kryo room E40.310 of the PANDA hall and the routing of the cooled helium line and the gaseous nitrogen line was shown as well. In this design routing of liquid nitrogen through the hall was avoided in order to reduce the safety requirements.

The second topic was the extension of the cooling pit that was previously designed to hold the reservoirs of the under-pressure cooling systems of MVD and EMC. The newly designed under-pressure cooling for the electronics racks in the PANDA hall also requires a reservoir below ground level. For this reason the cooling pit has to be extended by a factor two in size.
 

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