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

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#* Other  
 
#* Other  
 
# Electronics (Chris, Nick)
 
# Electronics (Chris, Nick)
−
# Full electronics test [https://halldweb1.jlab.org/elog-halld/FDC FDC E-log] (Beni, Vlad)
+
# Full electronics test [https://halldweb.jlab.org/elog-halld/FDC FDC E-log] (Beni, Vlad)
 
# Other
 
# Other
−
 
−
<!--
 
  
 
= Minutes =
 
= Minutes =
  
−
Participants: Bill, Chris, Nick, Simon, Fernando, Vlad, Eugene, Glenn, and Lubomir.
+
Participants: Eugene, Bill, Dave, Nick, Simon, Vlad, Beni, and Lubomir.
 
== Production ==
 
== Production ==
  
−
- On Monday we finished the tests with the third package and it was moved to Blue Crab. On the same day the spare package was moved to JLab.  
+
- 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.  
  
−
- Final package installation (see the pictures linked above): All the four packages were connected with the spacers. Like between with the first spacer we had to put additional rod in the second spacer to clear the gap between the spacer and the gusset ring. The last (shorter) spacer didn't need additional threaded rod, at least visually.
+
- 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.
  
 
== Engineering ==
 
== Engineering ==
  
−
- Survey: Jim Dahlberg was at Blue Crab yesterday and will start surveying the packages possibly tomorrow using 12ft articulated arm. The idea is to check (and correct) the flatness of each package and how parallel they are.
+
- Bill is working on Al strips along the FDC bearings and the mesh needed for pulling the FDC with the cables.
−
+
 
−
- Based on our experience with the test with full electronics we need good strain relief for the connectors. Therefore, Bill decided to make additional skim above the spacers to be used to attach the cables (see the model details linked above). It will use 15mil g10 (or lighter material) and be supported by ~22 or less plastic (or g10) holders attached to the rods. There will be cuts on the skin to insert cable ties. Bill will start prototyping it very soon.
+
- Survey: no news from Jim Dahlberg about the survey done two weeks ago.
 +
 
 +
- In the final design the FDC skin will consists of two pieces possible glued together.  
  
 
== Electronics ==
 
== Electronics ==
  
−
- There were long discussions about the grounding of the packages. We will have one ground cable clamped to all the packages at the holding brackets and possibly a separate removable ground cable connecting the packages to the clean ground. There will be some additional ground connections to other parts inside the package, but using thinner cables. The cooling manifolds are connected to the same ground. Fernando will stop at Blue Crab to make sure that grounding is done correctly and what modifications are needed eventually.
+
- 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 and Chris will fix the setting on the VXS power supply in 126. Fernando: this will further reduce the noise on the fADCs as it happened with the fADC250s (2.4kHz effect).
+
−
 
+
−
- Nick on the spare pre-amps: 14 pre-amps cathode type and 8 pre-amps anode type.
+
  
 
== Full electronics tests ==
 
== Full electronics tests ==
  
−
- The problematic card on D5 (channels 97A-120) with ~10 bad channels was fixed by inserting a thin (15mil) g10 plate in between the cathode and wire frame, thus applying pressure on the conductive tape. The plate was sticking out of the frame pushing the end of the pre-amp down. In this position there were 2 bad channels (Elog entry 116), but after Casey cut the plate and the pre-amp return to its normal position all the channels were working. However two channels of the next pre-amp stopped working.
+
- 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.  
−
 
+
−
- All the rest of the channels were fixed by touching the card or bending the cooling tube. In one case it was a wire pre-amp showing the same problems. Therefore, it is not only the conductive tape that causes these problems.
+
−
 
+
−
- We took data over the last weekend also at two other HV. For these two runs the F1TDC crate showed some problems that have to be understood.
+
−
 
+
−
- Now we have the spare package at 126 being flushed with gas.
+
−
 
+
−
== Other ==
+
−
 
+
−
- No meetings next two week. Next meeting on 8/8.
+
  
−
-->
+
- 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.

Latest revision as of 02:07, 1 April 2015

August 8, 2013 FDC meeting

Agenda

  1. Production
  2. Engineering (Bill)
    • Connector strain relief
    • Survey results
    • Other
  3. Electronics (Chris, Nick)
  4. Full electronics test FDC E-log (Beni, Vlad)
  5. Other

Minutes

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

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.

- 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.

Engineering

- Bill is working on Al strips along the FDC bearings and the mesh needed for pulling the FDC with the cables.

- Survey: no news from Jim Dahlberg about the survey done two weeks ago.

- In the final design the FDC skin will consists of two pieces possible glued together.

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.

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.

- 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.

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