• Circuit boards: All the circuit boards have been brought to JLab so they can be soldered here. 380 boards are completly finished (components+wires) except for the HV and signal cables. Most of the rest has components but no wires. It will take about a couple weeks to finish soldering everything. Also, no jumping wire is available right now. The company (Alphawire) is out of stock. I tried to call directly and ask if any other color was available, they will call me back. In any case, we should have more wires at the end of february. We found the additional 100Kohm resistors, but we miss quite a few 200Kohm, which I reordered and should arrive either at the end of this week or beginning of next.

 
• Ti flange gluing:  515 flanges are glued, which is most of what we can do right now since about 150 blocks have to be repolished before doing anything to them. The optical technician from Yerevan will arrive february 20th and will take care of that so we can go ahead and complete the task. 266 flanges have been tested with a 8kg longitudinal force and everything is fine.

 
• Al flange gluing:  250 flanges are glued. The rate is pretty high, about 20 a day, which means everything will be done by the end of  february. 

 
• Additionnal tubes:  It seems we don't have enough aluminum tubes (small and big ones) to prepare 800 full bases. Akob has reordered tubes and they're on site now. The tubes will be brought to ODU so they can be cut. We will then anodize them and go on with the aluminum flange gluing process.

 
• Cable tray design:  Ray showed us his latest design on the arm attached to the spectrometer that supports the cables over the beamline. The design seems to be in good shape. One question was raised by Al Gavalia who wanted to know what force was needed to actually move the arm around. Ray will look into that.

 
• Magnet support design:  Al Gavalia is the person working on the magnet support design. he showed us that the design of the support is pretty tough because of the space occupied by the piece of metal between the pivot point and both spectrometers (which is what constitutes the link between the spectrometers and the pivot point). Those plates are pretty wide and the support and moving mechanism for the magnet has to be designed properly so there is no interference. Al Gavalia will work more on that and report next time.

 
• DAQ electronics:  Ting reported on his work. He is setting up the test lab (building 58) for our experiment. Also he summarized what DAQ equipment was ordered/in stock. Within a month or two, we will probably have everything we need. The "sum-of-8" custom modules are not ready yet but we might have a test module from Ron Gilman at the end of february. We will have to test it to be sure it meets the required specs. On the DAQ software side, Ting has completed a script to setup discriminator thresholds and a decoder for a whole fastbus crate. What he needs to do now is setup a program so we can decode and look at data directly (apparently through PAW). The last thing we need to order is 3 NIM bins for the calorimeter side. I will look into that.

 
• HV control:  All the ethernet cards ($14 per unit !) are on site now. Roman has programmed the HV control software in JAVA and it seems to work just fine. The program might need an additional subroutine to check the connection with the mainframe is still on.

 

 

Franck Sabatie - 02/07/2000


PLEASE, fill free to mail any remarks or advice to Franck Sabatie, 
they will be transmitted and discussed at the next meeting.

maintained by  Franck Sabatie