BWSMeetingMinutes13July2016 < BWSUpgrade

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---++++ *Minutes BWS Upgrade: Electro-Mechanical Design Meeting #12* *-- 13th July 2016 --*

*Participants:* Raymond Veness, Bernd Dehning, Federico Roncarolo, Jonathan Emery, Patrik Andersson, Jose Luis Sirvent

*Agenda ( [[https://indico.cern.ch/event/543918/][ <span data-mce-mark="1">https://indico.cern.ch/event/543918/</span>]])*

<span>%TOC{ style="line-height: 200%;"}%</span>

---++++ 1. Communications (R.Veness)
   * PSB ECR already launched and progressing on the aproval
   * *%RED%Forks 2-3 units are out of tolerances%ENDCOLOR%*. The work has to be redone, which would delay the pieces availability to end of August.
   * For mounting test (on august) 1 of these fork will be modiffied to fix the tolerances with some bricolage.
   * The error comes from a perpendicularity deviation Shaft-Fork.
   * The assembly test will be performed in August and the device plans to be available for functional testing on September.
---++++ 2. Alxion Standard and Special Motor testing (J. Emery)
   * Tested Alxion Standard and Special version with modiffied airgap (300V)
   * %RED% *Back-EMF normal version: Show nice results and 1% deviation respect to specs* %ENDCOLOR%
   * %RED% *Back-EMF special version: Show also nice reults with 4% deviation respect to "estimated" specs.* %ENDCOLOR%
   * Not clear if special version was tested by Alxion before procuring specifications or they approximated by calculations
   * Speed and profiles tests with Special Alxion show satisfactory results with Dspace, calculated torke ~ real required torke
   * %RED% *Problem found after motor testing:* %ENDCOLOR%
      * Appeared after the week-end (test finished Friday, problem appeared Monday)
      * Motor generates a extrange noise even when not moving and holding position
      * Effect is not symetrical, appears in In & Out Scans but seems stronger in Out scans.
      * Currently trying to work out the reason:
         * During movement the currents are showing a extrange behaviour
         * Motor dismounted, visual inspection (Dmitry) show no frictions
         * Isolation on phases seems not to be the problem, tests show that they're ok.
         * Cross-Check wiht Parker motor--&gt; No problem seen
         * Test with older compiled code --&gt; Problem still seen
         * Generator Mode --&gt; the output voltages are Ok
      * Next steps:
         * Try standar Alxion
         * Try another Alxion stator 300v
         * try standar rotor.
      * For the moment the reason still unclear.
---++++ 3. PSB Acquisition system: Intallation proposal (J.L. Sirvent)
   * %RED% *Installation requirements: 1 Functional system (PSB standard) + 1 Test flexible test platform (Independent systems)* %ENDCOLOR%
   * Base line is %RED% *acquisition on surface* %ENDCOLOR%, both options send their analog signals to surface
      * In PSB short cables & long bunches --&gt; Fine for BW point of view (bunch pile-up)
      * Gain in noise reduction &lt;&lt; Risk of failure of acquisition Front-End for radiation exposure
      * In any case allow installation of a Front-End for testing pourposes
   * The idea is to procure a operational (PSB) system 100% available for functional validation
   * Allow space & cabling flexibility to test different scintillator + photo-detector configurations
      * Standard Cylindrical 30x30mm
      * New Rectangular 100x100x10mm
      * MaPMT, HPD, Filterweels
      * Space reservation for 1 Front-End
   * 3 Set-up Configuratoins show using the same cabling requirements.
   * High dynamic range acquisition system (no required filter / pmt gain tuning)
      * Strategy 1. HPD + QIE10/12 (1e5)
      * Stregety 2. MaPMT + ICECAL (1e5)
      * Stragety 3. MaPMT + 2 x QIE10/12 (1e7?)
   * %RED% *New mechanics required to procure for both assembies:* %ENDCOLOR%
      * FilterWeels
      * PMT/MaPMT/HPD shielding
      * Scintillator/Waveghides holder
      * Supports
      * %RED% *All these details are not included on ECR* %ENDCOLOR%
   * <span data-mce-mark="1" style="background-color: transparent;">%RED% *Studies on PSB needed* %ENDCOLOR% to:</span>
      * <span data-mce-mark="1" style="background-color: transparent;">Estimate required dynamic range on PSB</span>
      * Adjust acquisition systems working point
      * Cross-Check PSB simulations
      * Check possible improvements by changing Scintillator Geometry
      * Check Light yields on scintillator per impacting proton on wire (for different energies/intensities)
   * Proposed ways to proceed:
      * Trust on simulations ? Check with Roberto Rocca.
      * Estimate light yield trough measurements stored on measurements DB
      * Prepare measurement campaign new systems when installed.
---++++ 4. Comments from Dundee Visit (R.Veness)
   * Some issues were identiffied thanks to the visit
   * *Residual material* observed on measurements:
      * It reduced the reflectivity on some disk areas
      * %RED%Comes from some abrasive liquid used for finishing the laser slits.%ENDCOLOR%
   * *Smooth transition* Reflective/Non Reflective
      * Such smotth transition did not allow enought "flat" reflective area between slits
      * Sample and laser are in a fix position, Laser scans the disk by angular movements
      * %RED%Laser loses focal point, which produces wider slits%ENDCOLOR%
   * For Dundee Equipment, 20 um width slits was already on the limit (we asked for 10um slits)
   * The fabrication of full size disk would produce worst slits due to equipment configuration
   * *%RED%Dundee required XY Stage + Controller system (and maybe new laser) to produce high quality slits.%ENDCOLOR%*
      * Estimated Cost &gt; 10KCHF
      * In collaboration with other sections and other uses foreseen, if required cost may be splitted by 3.
      * Jose's remarks:
         * With commercial company we reach the results required for the slits.
         * Does it worth it? we'd need a guarantee that this new equipment would produce better slits than commercial.
         * In any case, the sensor weak point is the surface quality (roughness, defects, reflectivity)
         * Instead of spending time/money in building very spensive disk it may worth it to improve the sensor robustness with some minor mofifications for metallic disks usage (more scaning dots / different configuration).
Topic revision: r1 - 2016-07-14 - unknown
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