Difference between revisions of "Minutes-10-17-2013"

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#* Results from the full electronics test
 
#* Results from the full electronics test
 
# Other
 
# Other
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= Minutes =
 
= Minutes =
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== Installation preparations ==
 
== Installation preparations ==
  
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- Pictures linked above show the current status of the FDC platform in the Hall. The first cart has been installed on the platform and the survey people aligned the rails inside BCAL with the rails on this cart. The cooling manifold for the BCAL on the upstream side of the magnet has not been installed yet but should be done soon (Bill). The racks on the left side (looking downstream) have been put in place, probably not finally installed. The holes below the racks on the right side have been marked but not cut. The mesh has not been modified yet. Holes in the beam below the platform have been made on the left side (right will be done soon, as well) and we discussed if the size is big enough for one bundle of 8/9 cables; the problem is that the connectors at this side are big and you have to un-bundle the end to insert the cables one by one. We will have ~18 bundles at one side, not sure if we have 18 holes.
+
- Current status of the FDC related stuff in the Hall shown with pictures linked above. Lubomir and Dave discussed with Tom today the work schedule in the hall. As of today, the plan is to move the FDC to the hall next week, earliest on Tuesday (Oct. 22). By the end of the day they will finish with BCAL cabling and the cooling rings will be installed tomorrow. On Monday all the platform will be cleaned and the survey people will be aligning the top and bottom rails on the first cart and inside BCAL. It turned out the top part of the cart had to be shifted to match the top rail inside BCAL, but the side rails have not been touched. Additional plates on the bottom of all the carts had to be installed to prevent the carts from tilting. By some reasons the top and bottom rails inside BCAL have been replaced by longer once reaching the downstream end of the magnet, but they are not needed that long? (Bill will check this).  
−
Also, we will need more people when pulling/pushing the cables through these holes.
+
  
−
- We discussed what to do with the systems that are absolutely needed for the FDC installation but will not be ready before the installation starts: gas, electric power and cooling. Gas: Dave will check what has been installed and how it can be modified. Beni: if some of the 500 ccpm flow controllers have been installed already then we don't have enough for a temporary gas system. Electric power: for the LV crate we need 208V which would require a portable transformer. Fernando volunteered to check the availability and what else is required to power the LV crate (the minimum needed to start cabling).
+
- The gas system panel will be installed on the platform at the left side of the magnet at the downstream end. 1/2" tube will go to the FDC and CDC from there. The gas controls will be in a rack at the floor at the left-upstream side of the magnet (to avoid noise in the electronics at the right racks). The cooling system will be at the downstream side of the magnet on the floor. We discussed if the cooling system and the solenoid valves in the gas panel will operate without problems in ~50 gauss magnetic field. Bill will look at this and if possible wants to test them with a field. At the beginning we will use Nitrogen from a dewar to flush the chambers, but by November 11th we want to have at least a temporary gas system with AR and CO2 to start testing with HV.
 +
Casey is working on the chilled water piping needed by November 4th when we will start testing the LV cables.
  
−
- The moving date will depend on the readiness of the above (temporary or permanent) systems. In any case it can't be next week (Eugene) because in case of a shutdown the FDC better be in the EEL. Eugene needs information from Lubomir and Beni to include the FDC check (of the gas flow) in the lists of the critical tasks in case of a shutdown. The AC in 126 is already included.  
+
- As of now the plan is to move FDC middle of next week. Then (for one week at least) there will be a survey and also dry runs of moving FDC in and out of the magnet to make sure the rails are OK and it returns to the same position. Approximately on November 4th we will start connecting and testing the LV cables. Fernando: by that time all the LV, HV and TDC crates will be installed in the racks. One week later, Nov.11, we plan to start connecting the signal cables. At that time we will need the mini DAQ to test the cable connections and Beni is working on this. The mini-DAQ will be placed at the back wall near the pair-spectrometer. For that Beni needs a crate with fADC and TDC with self-triggering feature. Fernando: it's possible but right now Cody has the full crate testing as a priority.
 
   
 
   
 
== Engineering ==
 
== Engineering ==
  
−
- The skin between the FDC packages has been installed by Bill and Casey, also Tina today. Tomorrow (probably) Casey will install the tubes between the cooling manifolds.  
+
- The mesh for the cables has not been assembled yet and Tom is looking for the parts. Bill will take care of this.  
  
 
== Electronics ==
 
== Electronics ==
  
−
- Half of the signal cables have been labeled by the summer students and we decided to label the rest. The cables for one package were moved from Blue Crab in August and can be labeled. The rest of the cables (also one package) has been used for the full electronics test. We started disconnecting these cables and most are packed back in their original boxes in 126. When Beni is done with the F1TDC test next week we will finish the rest.  
+
- Nick needs the last signal cables from 126 that has not been labeled yet. Most of them are packed in boxes and ready to be moved but 35 are used by Beni in the test F1TDC test, so these will be taken next week. Vlad installed the last pre-amp on the FDC that had to be replaced.  
  
 
== Tests at EEL126 ==
 
== Tests at EEL126 ==
−
 
−
- Beni showed his results of the F1TDC tests (Entry 117 in the Elog) in the following configuration: two regular cells (3 and 6) with +HV of 2150V, but (due to the lack of HV cables) only half of each cell was connected to negative -500V, the other half put on 0V (ground). One can clearly see the difference in the drift time spectra (last two plots in the entry). Some of the cards/ASICs (8 chan.) are noisy, and 3 channels are missing most likely due to the cards (we have used the last spares).  Fernando suggested to try using the pulser built in the new F1TDCs, first, to test this feature, and second, to identify the source of the missing channels. The same pulser is in fADC125 but has not been tested (firmware not ready yet).
 
−
 
−
- Eugene started discussion about the cathode deformation during the tensioning and the effects on the resolution. Beni explained that he sees some deviations from the uniformity in terms of the wire positions as reconstructed from the strips. Eugene has measured the elongation perpendicular to the strips to be 0.25% and much bigger than along the strips (GlueX doc 1090), but for 5micron copper. Based on his estimations in the same doc (Table 2) for 2 micron copper the elongation must be factor of 2 bigger but very similar in both directions, i.e. about 5mm in total. This certainly has to be taken into account in the analyses.
 
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Revision as of 16:51, 17 October 2013

October 17, 2013 FDC meeting

Agenda

  1. Installation preparations [1] (all)
  2. Engineering (Bill)
  3. Electronics (Chris, Nick)
  4. Tests in EEL126 FDC E-log (Beni, Lubomir)
    • New F1TDC
    • Results from the full electronics test
  5. Other

Minutes

Participants: Eugene, Bill,Dave, Chris, Simon, Fernando, Beni, and Lubomir.

Installation preparations

- Current status of the FDC related stuff in the Hall shown with pictures linked above. Lubomir and Dave discussed with Tom today the work schedule in the hall. As of today, the plan is to move the FDC to the hall next week, earliest on Tuesday (Oct. 22). By the end of the day they will finish with BCAL cabling and the cooling rings will be installed tomorrow. On Monday all the platform will be cleaned and the survey people will be aligning the top and bottom rails on the first cart and inside BCAL. It turned out the top part of the cart had to be shifted to match the top rail inside BCAL, but the side rails have not been touched. Additional plates on the bottom of all the carts had to be installed to prevent the carts from tilting. By some reasons the top and bottom rails inside BCAL have been replaced by longer once reaching the downstream end of the magnet, but they are not needed that long? (Bill will check this).

- The gas system panel will be installed on the platform at the left side of the magnet at the downstream end. 1/2" tube will go to the FDC and CDC from there. The gas controls will be in a rack at the floor at the left-upstream side of the magnet (to avoid noise in the electronics at the right racks). The cooling system will be at the downstream side of the magnet on the floor. We discussed if the cooling system and the solenoid valves in the gas panel will operate without problems in ~50 gauss magnetic field. Bill will look at this and if possible wants to test them with a field. At the beginning we will use Nitrogen from a dewar to flush the chambers, but by November 11th we want to have at least a temporary gas system with AR and CO2 to start testing with HV. Casey is working on the chilled water piping needed by November 4th when we will start testing the LV cables.

- As of now the plan is to move FDC middle of next week. Then (for one week at least) there will be a survey and also dry runs of moving FDC in and out of the magnet to make sure the rails are OK and it returns to the same position. Approximately on November 4th we will start connecting and testing the LV cables. Fernando: by that time all the LV, HV and TDC crates will be installed in the racks. One week later, Nov.11, we plan to start connecting the signal cables. At that time we will need the mini DAQ to test the cable connections and Beni is working on this. The mini-DAQ will be placed at the back wall near the pair-spectrometer. For that Beni needs a crate with fADC and TDC with self-triggering feature. Fernando: it's possible but right now Cody has the full crate testing as a priority.

Engineering

- The mesh for the cables has not been assembled yet and Tom is looking for the parts. Bill will take care of this.

Electronics

- Nick needs the last signal cables from 126 that has not been labeled yet. Most of them are packed in boxes and ready to be moved but 35 are used by Beni in the test F1TDC test, so these will be taken next week. Vlad installed the last pre-amp on the FDC that had to be replaced.

Tests at EEL126

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