Notes - FPS/ICD Mechanical Meeting + updates Week of July 7-11, 1998 Thanks to Abid, Jack, Jia Li, and Jon for post meetings input send additions/corrections to Elizabeth Gallas July 7 FPS/ICD meeting in attendance: Elizabeth Gallas, Jia Li, Lee Sawyer, Craig Neerman, Jon Kotcher, Abid Patwa, Michael Rijssenbeek, Peter Yamin, Satish Desai. July 9, Jia Li and Elizabeth Gallas (EG) met with Jack Mateski. Other interested persons: Del Miller, and Herm Stredde, Andy White, Ron Ray (CD cable routing) Purpose of both meetings: discuss the coordination of the mechanical support and cable routing of the FPS and the ICD on the ECs. ------------------------------------------------------------------------- ------------------------------------------------------------------------- ACTION ITEMS (more details below): ANDY WHITE: DEL needs the iron block for the solenoid test as soon as possible. JIA LI: put dxf file of the iron block on your www page. JIA LI: High priority assigned to providing an AutoCad version 12 drawing of the ICD module support design to the FPS group (Jon Kotcher, Abid Patwa) and Jack Mateski/Herm Stredde. Jia Li has posted the DXF files from http://www-hep.uta.edu/~lijia/ which can also be located through the Run II ICD home page: http://www-d0.fnal.gov/hardware/upgrade/icd/icd.html . Let us know if you can't read or prefer another format. EG would also like to see an postscript version. JON and ABID have made an Autocad 12 version of the final FPS detector, viewed in r-phi. JIA LI should access this drawing by doing the following: ftp atlas2.phy.bnl.gov login => username "anonymous", password "anonymous" get ICD-position-ACAD12.dwg ABID has an updated version of the FPS clear fiber routing scheme on the web in AutoCad 12 format: http://www-d0.fnal.gov/~abid/fps/ Two files: FPScable2-1.dwg (ACAD 12 drawing, dated: July 13, 1998) FPScable2.eps (postscript -- same as before) ------------------------------------------------------------------------- ------------------------------------------------------------------------- FPS/ICD MODULE SUPPORT: There was some confusion about the orientation of the ICD which EG thought had been finalized 9-DEC-1997: "(ICD agrees that)... the ICD tile module array should be rotated by .2 in phi so that the topmost ICD module stradles the vertical line at x=0. This rotation facilitates more complete coverage about the solenoid chimney by minimizing the number of special ICD modules required." Jon (FPS) agrees with this orientation, but if anyone else sees any problems with this, please let us know asap otherwise, we consider this final. The current ICD tile module support requires 16 studs at the ICD inner radius (each stud supporting the inner corner of two adjacent modules. Current studs are 3/4" in z (length) and have 1/4" diameter. We now realize that these studs seem to be located at the same phi locations of the alternating studs and bosses for the FPS ribs. A shared stud design is NOT preferred by either FPS or ICD group. We must adjust the ICD mounting scheme as necessary. Jack Mateski is currently working on the locating fixture (or template) for the FPS studs. These studs are scheduled to be welded in August or September. It is obvious that we can save time/effort in the long run if we can locate/weld the ICD studs at the same time. An immediate exchange of CAD drawings is essential so that precise stud locations can be combined/coordinated. Jack plans to include these 16 inner ICD studs on the FPS fixture. There are currently 4 additional studs per ICD tile module around the ICD outer radius (2 for module support and 2 to stabilize the fiber cable stress relief bar. A separate fixture will probably be made to locate these 4 studs relative to the 2 inner studs. This second fixture is not so time critical. Jon points out in post meeting email: "I have a print of the corrected detector positions. I'll fax it to you (send me your fax number please). There is currently an overlap of 4 mm of our outer ribs and your stud hardware. ... I believe that fixing your modules by one stud at the center of each of your modules could be made to work quite well for both of us. It also decouples your boxes, and fixes your modules to the point where they are tangent to the cryostat (a simplification in many ways). Three points is all you need anyway: two up top and one at the base will be sufficient. I also believe the size of your fixation brackets could be made much smaller, without sacrificing any stability." Given the overlap Jia Li should consider this option, but EG worries only that the thickness of the ICD at the tangent point will be increased if this idea is implemented. The difficulty being how the support bracket is fixed to the box at this point (this edge is formed by folding aluminum to reduce it's profile). ------------------------------------------------------------------------- EMERGENCY FPS MODULE REMOVAL: Should it be necessary to remove one of the FPS modules closer to the EC's, two adjacent ICD modules would need to be removed. During the meeting, Jia Li confirmed Elizabeth's previous estimate of the clearance required to remove an ICD module of 25" in r and 7" in z. Whatever support scheme is adopted for the ICD tile modules, it should have the following features: a. support bolts accessible b. removal of one module should not affect adjacent modules c. keep low profile. The lowest profile point is at the center of the module. Because the box edge is flat and the EC is curved, the ICD rises off the cryostat in z at the edges. Is it possible to devise support at the corners partially underneath the corners? ------------------------------------------------------------------------- FPS/ICD CABLE ROUTING: Abid showed his latest FPS cable routing scheme at the meeting. See http://www-d0.fnal.gov/~abid/fps/FPScable2.eps FPS cables are routed in a curving path over ICD tile modules and then downward to a special cable winder below the ECs. It was decided that FPS cables can be affixed to the ICD tile module aluminum boxes with stick-on velcro or cable tie fixtures (no penetration of the aluminum covers). The weight of the cables should be estimated. ICD cable routine plan is not complete, but it is not an immediate need. LEE SAWYER reports that the ICD fiber cables have a diameter of 6 mm. ICD cable routing should have the following features: a. all ICD fiber cables have the same length b. excess length must be absorbed on the EC surface since they plug into the PMT crate just outside the ECs (no room there for winding). c. stress relief bar needs to be designed for the cables exiting the tile modules and the cable entrance to the PMT crates. Overall, both FPS and ICD cable routing must coordinate also with central detector cable routing (Ron Ray) and avoid the chimney area. ------------------------------------------------------------------------- SOLENOID TEST: Del needs the iron block for the solenoid test as soon as possible so that he can arrange the support structure that will hold it. This means we need 1. a crate 2. a prototype fiber backplane calibration assembly installed in a backplane enclosure. ------------------------------------------------------------------------- RUNNING DCS (to get FNAL drawings from the file system): For example, drawing number 900409-01 is a cross section in the x-z plane showing the space available between the CC and EC cryostats in z when the detector is closed. You need an account on d0ms02. INSTRUCTIONS FOR RUNNING IDEAS MS OR GETTING A DRAWING FROM DCS: $ telnet d0ms02 username: password: echo $DISPLAY ! make sure your display is set d0uta1.fnal.gov:0 ! to your workstation ! if not, for example: ! setenv DISPLAY d0uta1.fnal.gov:0 spl ! go to your spool area /ideas_spool/gallas pwd ! show where you are /dzero/dks0d3s7/ideas_spool/gallas drafting ! to start up I-DEAS Master Series 4: ! and look at drawings in spool area ! to retrieve a FNAL drawing in DCS xdcs & ! starts up DCS v4.0a under Settings choose Vault --> D0 layouts under Item choose Query - get a list of drawings or type in part number 900409-01 check out with COPY ONLY setting this allows you to write the file to your spool area then you can look at it with drafting if you have any questions, call Margaret_Greaney or Jack Mateski mateski@d0ms02.fnal.gov