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September 19, 2013 FDC meeting


  1. Installation preparations [1] (all)
  2. Engineering (Bill)
  3. Electronics (Chris, Nick)
  4. Tests in EEL126
    • New F1TDC (Beni)
    • Thick cell analysis (Vlad) [2],[3]
  5. Other


Participants: Bill, Dave, Chris, Nick, Simon, Vlad, Beni, Glenn, and Lubomir.

Installation preparations

- The four rails inside BCAL that will support the FDC, CDC, and the mesh were installed, but not adjusted. Survey of the BCAL position has been done, but we haven't seen the results yet. Next, depending on the BCAL position, the rails have to be aligned, that will take several days survey people working there. Bill: if they can't be adjusted to the nominal distance, we will have to re-adjust the distance between the rails on the carts. It will not be easy to adjust the rails on the cart where the FDC is, but Bill says it's doable.

- The techs will start soon the installation of the FDC platform. The space between the two rails on the platform (holding the carts) is very small, it will be very difficult to work at the bottom side of the packages. The racks have not been installed yet, first cable holes have to be cut. The electronics will not be installed until all the dirty work is finished.

- We discussed a lot if the BCAL cable and infrastructure installation will interfere with the FDC installation. Bill: certainly prior to the FDC installation the two cooling rings (manifolds) have to be installed; the whole cooling system have to be tested, but what about the signal cables? It's not clear if the Nitrogen cooling, cables for the control and monitoring system also have to be installed in advance. Not all of these subsystems are ready, some have not been decided yet. Beni proposed to ask Elton to explain their plans on the next FDC meeting so that we can synchronize our activities.

- Gas system: Scott started some work in the gas room: installing the rack and the holder for the mixture volume; the fridge is ready. Cooling system: Floyd Martin is working on the connection to the chill water, it will be done with plastic tubes (Bill).

- Beni will start working on a mini DAQ to be used to test the cables when connecting them to the detector. We will need one fADC and one F1TDC module as they are in two VXS crates. Will trigger from a generator and just look for a noise.


- Bill has all the parts for the metal plates to be attached on the sides of the packages. For the skin, the g10 pieces are ready; Anatoly has cut the angle holders but have to make slots on them. Next week Casey will be working on the FDC installing the skin and the tubes between the cooling manifolds.

Tests at EEL126

- Beni can read now the new F1TDCs with the DAQ. For this test we have all the HV cables to connect two cells: #6 (bottom) and #3 because they have parallel wires. Cell #3 will be fully equipped with wire and cathode cards. Cell #6 will have only wire cards, so in total we will have 4 new F1TDCs connected, per configuration. Thus we can do all possible tests on cell #3 and also wire resolution studies with both cells. Beni will keep the old configuration with the old F1TDCs in case we want to compare them with the new F1TDCs.

- Vlad showed an example how the cluster counting works (two plots attached above): one event with many fADC125 channels demonstrating how the coincidence between strips and wires can be used to count the clusters and remove the noise and overlapping events. Second plots (~20 events shown) demonstrates the abilities to reconstruct the particle track in the depth of the drifting volume; each point represents a cluster reconstructed in space like in the Time Projection Chambers.