Difference between revisions of "Minutes-8-15-2013"

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= Agenda =
 
= Agenda =
 
# Production  
 
# Production  
−
#* Moving out from Blue Crab (Dave) [http://www.jlab.org/Hall-D/detector/fdc/photographs/IMG_0716.JPG],[http://www.jlab.org/Hall-D/detector/fdc/photographs/IMG_0726.JPG],[http://www.jlab.org/Hall-D/detector/fdc/photographs/IMG_0722.JPG],[http://www.jlab.org/Hall-D/detector/fdc/photographs/IMG_0724.JPG],[http://www.jlab.org/Hall-D/detector/fdc/photographs/IMG_0718.JPG],[http://www.jlab.org/Hall-D/detector/fdc/photographs/IMG_0719.JPG]
+
#* Moving out from Blue Crab (Dave) [http://www.jlab.org/Hall-D/detector/fdc/photographs/IMG_0716.JPG],[http://www.jlab.org/Hall-D/detector/fdc/photographs/IMG_0718.JPG],[http://www.jlab.org/Hall-D/detector/fdc/photographs/IMG_0719.JPG],[http://www.jlab.org/Hall-D/detector/fdc/photographs/IMG_0722.JPG],[http://www.jlab.org/Hall-D/detector/fdc/photographs/IMG_0724.JPG],[http://www.jlab.org/Hall-D/detector/fdc/photographs/IMG_0726.JPG]
 
#* FDC cabling (Lubomir, Vlad) [http://www.jlab.org/Hall-D/detector/fdc/photographs/IMG_0706.JPG],[http://www.jlab.org/Hall-D/detector/fdc/photographs/IMG_0672.JPG],[http://www.jlab.org/Hall-D/detector/fdc/photographs/IMG_0670.JPG],[http://www.jlab.org/Hall-D/detector/fdc/photographs/IMG_0684.JPG], [http://www.jlab.org/Hall-D/detector/fdc/photographs/IMG_0679.JPG],[http://www.jlab.org/Hall-D/detector/fdc/photographs/IMG_0674.JPG],
 
#* FDC cabling (Lubomir, Vlad) [http://www.jlab.org/Hall-D/detector/fdc/photographs/IMG_0706.JPG],[http://www.jlab.org/Hall-D/detector/fdc/photographs/IMG_0672.JPG],[http://www.jlab.org/Hall-D/detector/fdc/photographs/IMG_0670.JPG],[http://www.jlab.org/Hall-D/detector/fdc/photographs/IMG_0684.JPG], [http://www.jlab.org/Hall-D/detector/fdc/photographs/IMG_0679.JPG],[http://www.jlab.org/Hall-D/detector/fdc/photographs/IMG_0674.JPG],
−
# Engineering (Bill)
+
# Engineering [http://www.jlab.org/Hall-D/detector/fdc/drawings/mesh_attach1.PNG], [http://www.jlab.org/Hall-D/detector/fdc/drawings/mesh_attach2.PNG], [http://www.jlab.org/Hall-D/detector/fdc/drawings/mesh_attach3.PNG] (Bill)
−
#* Survey results
+
#* Survey results [http://www.jlab.org/Hall-D/detector/fdc/documents/DT_D1518.xml]
 
# Electronics (Chris, Nick)
 
# Electronics (Chris, Nick)
 
# Tests at EEL126
 
# Tests at EEL126
 
# Other
 
# Other
−
 
−
<!--
 
  
 
= Minutes =
 
= Minutes =
Line 19: Line 17:
 
== Production ==
 
== Production ==
  
−
- The prototype skin for the cables (a quoter) was installed by Bill and technicians and yesterday we started cabling a quoter of the packages (see pictures linked above). The first two packages and some of the third are connected  already with signal cables. What did we learn so far: the skin provides enough strain relief; it doesn't hold the cable very tight but due to the slack that in any case we need, it is OK. We need to double the number of cuts for the cable ties in order to distribute the cables more evenly. We put individual cable ties right next to the connector but then we group 4-5 cables together. It is difficult to work in the places where the rails for the mesh are, but we didn't remove them. Maybe it will be necessary in the Hall when installing the LV connector, but certainly we want to keep the rest of the cart frame for protection. The highest density/thickness of the cables is right at the first package where you have also all the cables from the other packages with some slack so that you can have access to the pre-amps there. The area at the middle rail is especially dense and most likely we will not be able to run the HV cables there (where the connectors are); we better direct them to the top, opposite to the cooling manifolds. Finally, we use a "sit &spin" toy as a cable winder: works great. By Friday the cabling will be done and we will start disconnecting the cables on Monday evening.  
+
- On Wednesday (8/14) we moved the FDC from Blue Crab to EEl126 (see pictures attached). We installed tires on the cart at 30psi that worked as a cushion. Dave: had problems with the truck this morning that delayed the moving; still thinks will finish by Friday. If not, some stuff can be left at Blue Crab close to the doors to be moved on Monday. Eugene suggested to move the two granite tables left at Blue Crab (one went to Brian Cross) to the ESB temporary and then try to occupy some of "our space" in the TEDF or Test Lab. Tom is providing help for the transportation.
  
−
- Dave: moving out is going smoothly so far. The big items: we will keep the stringing granite table somewhere in the ESB. One granite table will be loan to Brian Cross, we will have to find a user for the other. The mounting jig and the tooling for the package assembly will be kept in 126. We all agreed the FDC (on a 60x80" cart) will go to 126. Beni suggested putting it on the left side of the Hall D area next to the slow control racks. There we can test it with gas and HV and even install scintillators for triggering and get some data (Beni). We will need to remove one door and move one cabinet to make space at the entrance of 126. The plan is to move the FDC on Wednesday.
+
- End of last week we finished the cabling dry run: 1/4 of the signal cables were installed (see pictures attached). The additional rails for the mesh are causing some problems for the installation and service of the chambers being very close to the pre-amps and connectors. Especially, due to the four additional rails on the sides the density of the cables between the rails is very high so that it is difficult to work on the pre-amps behind them. It turned out that the axis of the mesh for this exercise was shifted with respect to the FDC axis and we had more space at the side where we did the cabling than we are supposed to. Other than that and the finding that we need more cuts on the skin for cable attachment, everything was successful and the dry run demonstrated that the current cabling scheme will work.
  
 
== Engineering ==
 
== Engineering ==
  
−
- Bill is working on Al strips along the FDC bearings and the mesh needed for pulling the FDC with the cables.
+
- We discussed the possibility to remove the four extra rails on the sides and to use the two main rails (for the detectors) to attach the mesh on the sides. We still need the top and bottom rails for the mesh. Bill: this is possible and will work on that. We need to make the upstream mesh bearing removable so that the CDC can be inserted inside the mesh. Bill thinks using the same rails for the detector and the mesh will not be a problem with respect to possible deformations.  
  
−
- Survey: no news from Jim Dahlberg about the survey done two weeks ago.
+
- Bill showed several drawings (linked above) explaining the attachment of the pulling straps to the FDC bearings and the mesh: using plates and additional strap on the mesh. The same plates will be used to attach the grounding cables.  
  
−
- In the final design the FDC skin will consists of two pieces possible glued together.  
+
- Results of the FDC survey at Blue Crab are linked above. Four fiducials per package were installed but not spaced exactly by 90deg (+/-15). The package positions were adjusted (up-down, left-right) in order to have <0.5mm offset from the ideal position in X and Y. In Z we have deviations from the vertical position up to 0.75mm, but we could not estimate right away what fraction of the deviation is due to a tilt and what due to a deformation. For that, survey people were supposed to do flatness measurements, but they didn't. The final survey will be done in the Hall on the platform before the cabling. We all agreed it is not worth doing one more survey in the EEL.
 +
 
 +
- We discussed how the rails inside BCAL will be installed and how they will be adjusted to the rails on the three carts. Working inside BCAL to install/adjust the rails will not be easy, but there's no way around it. The carts as installed on the platform rails will be movable in all direction, so as soon as the distance between the main rails is OK (it has be adjusted/surveyed at Blue Crab) it will not be a problem. The mesh rails don't have to be adjusted very precisely.
  
 
== Electronics ==
 
== Electronics ==
  
−
- 5 out of 132 signal cables that are at Blue Crab had broken connector locks (before using them). The cables were given to Nick and Chris.
+
- Nick fixed the 5 connectors on the signal cables. Thus the flat part on these cables gets shorter and Bill suggested connecting them to the pre-amps that don't require bending of the cable.  
−
 
+
−
== Full electronics tests ==
+
  
−
- Beni is working on an user interface that demonstrates the t0 finding procedure for the fADC125. He uses Naomi's algorithm, but modified. He is also working on an algorithm for the fADC125 that will help the estimation of the strip hit position. 
+
== Tests at EEL126 ==
  
−
- The last three runs in the tests with full electronics had bad F1TDC timing, but the strip data is OK; Beni will look into that if the wire information can be recovered. Still, before, we had good runs to be used for the wires.
+
- The FDC was connected to the gas Ar/CO2 40/60 at 100ccpm. The packages were connected in series i.e. there's some pressure change from the first to the last package. We have four independent bubblers (one per package) that are all bubbling. The pressure is 30-50Pa. The plan is to apply HV to all the packages and make sure all the HV channels are working.  
 +
 
 +
- The spare package was connected to the Oxygen sensor showing 300ppm as of Thursday and 230ppm on the next day. The flow was increased from 50 to 220ccpm. There's more work on the signal/LV cabling and on the grounding to be done before we start testing the spare package with DAQ.
  
−
-->
+
- Beni and Eugene discussed the possible fADC125 algorithms, a continuation from the tracking meeting.

Latest revision as of 16:50, 16 August 2013

August 15, 2013 FDC meeting

Agenda

  1. Production
  2. Engineering [13], [14], [15] (Bill)
    • Survey results [16]
  3. Electronics (Chris, Nick)
  4. Tests at EEL126
  5. Other

Minutes

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

Production

- On Wednesday (8/14) we moved the FDC from Blue Crab to EEl126 (see pictures attached). We installed tires on the cart at 30psi that worked as a cushion. Dave: had problems with the truck this morning that delayed the moving; still thinks will finish by Friday. If not, some stuff can be left at Blue Crab close to the doors to be moved on Monday. Eugene suggested to move the two granite tables left at Blue Crab (one went to Brian Cross) to the ESB temporary and then try to occupy some of "our space" in the TEDF or Test Lab. Tom is providing help for the transportation.

- End of last week we finished the cabling dry run: 1/4 of the signal cables were installed (see pictures attached). The additional rails for the mesh are causing some problems for the installation and service of the chambers being very close to the pre-amps and connectors. Especially, due to the four additional rails on the sides the density of the cables between the rails is very high so that it is difficult to work on the pre-amps behind them. It turned out that the axis of the mesh for this exercise was shifted with respect to the FDC axis and we had more space at the side where we did the cabling than we are supposed to. Other than that and the finding that we need more cuts on the skin for cable attachment, everything was successful and the dry run demonstrated that the current cabling scheme will work.

Engineering

- We discussed the possibility to remove the four extra rails on the sides and to use the two main rails (for the detectors) to attach the mesh on the sides. We still need the top and bottom rails for the mesh. Bill: this is possible and will work on that. We need to make the upstream mesh bearing removable so that the CDC can be inserted inside the mesh. Bill thinks using the same rails for the detector and the mesh will not be a problem with respect to possible deformations.

- Bill showed several drawings (linked above) explaining the attachment of the pulling straps to the FDC bearings and the mesh: using plates and additional strap on the mesh. The same plates will be used to attach the grounding cables.

- Results of the FDC survey at Blue Crab are linked above. Four fiducials per package were installed but not spaced exactly by 90deg (+/-15). The package positions were adjusted (up-down, left-right) in order to have <0.5mm offset from the ideal position in X and Y. In Z we have deviations from the vertical position up to 0.75mm, but we could not estimate right away what fraction of the deviation is due to a tilt and what due to a deformation. For that, survey people were supposed to do flatness measurements, but they didn't. The final survey will be done in the Hall on the platform before the cabling. We all agreed it is not worth doing one more survey in the EEL.

- We discussed how the rails inside BCAL will be installed and how they will be adjusted to the rails on the three carts. Working inside BCAL to install/adjust the rails will not be easy, but there's no way around it. The carts as installed on the platform rails will be movable in all direction, so as soon as the distance between the main rails is OK (it has be adjusted/surveyed at Blue Crab) it will not be a problem. The mesh rails don't have to be adjusted very precisely.

Electronics

- Nick fixed the 5 connectors on the signal cables. Thus the flat part on these cables gets shorter and Bill suggested connecting them to the pre-amps that don't require bending of the cable.

Tests at EEL126

- The FDC was connected to the gas Ar/CO2 40/60 at 100ccpm. The packages were connected in series i.e. there's some pressure change from the first to the last package. We have four independent bubblers (one per package) that are all bubbling. The pressure is 30-50Pa. The plan is to apply HV to all the packages and make sure all the HV channels are working.

- The spare package was connected to the Oxygen sensor showing 300ppm as of Thursday and 230ppm on the next day. The flow was increased from 50 to 220ccpm. There's more work on the signal/LV cabling and on the grounding to be done before we start testing the spare package with DAQ.

- Beni and Eugene discussed the possible fADC125 algorithms, a continuation from the tracking meeting.

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