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Profile Monitor Follow-up

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ELENA Profile Monitor Follow-up meeting:
 
Date: 28th April 2020
Connected: F. Butin, J. Cenede, M. McLean, L. Ponce, R. Jones and G. Tranquille
 
 
Tests with V3 front-end board (Mark))
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  • Tests done with V3 boards made in Japan, another six V3 boards being made in Europe
  • Light found to have an effect on ASIC performance and noise (one of reasons why V2 with an opaque cover was worse than V1)
    • Effect more pronounced in lab, but present as well for (all versions) electronics installed in tanks in the hall
  • Investigations on background noise in the lab:
    • Inherent noise difficult to measure as noise picked up dominating
    • Noise found similar for all three front-end versions, nevertheless with V3 somewhat higher noise at certain frequencies (e.g. 40 MHz) for most measurements
    • V3 with the metal cover replaced by a plastic one (as the other version) leads to the same lower noise level
      => Mark will investigate if larger distance between conductor paths and metallic cover solves and improves.
  • Response to calibration (on board): significant variations found for one and the same channel, very different from V1 and V3 boards and to response to external stimulus.
  • Test board available to inject a signal from a signal generator via capacitances, two different "profiles" possible (one with constant charge for all channels and one similar to a profile from a beam)
    • Nice first results obtained!
  • Status and actions:
    • With the changed situation (V3 front-ends being tested long before availability of beams similar to the ones expected for transfer line commissioning), the aim is to launch, if possible, front-end series production.
    • Timescale: almost three months from launch of series production (two months for production of boards, one week for ASIC wire bonding, three weeks testing) until installation.
    • Difficult to draw conclusions to date. Mark will carry out further comparative tests of the three versions.
      => We aim for another meeting say in two or three weeks to revise the situation.
    • Test with the electronics installed in a tank close to the fast deflectors pulsing (and possibly generating EM noise) would be very useful
      => Action: Mark and Jean will coordinate with Francois and access the area together.
      => Action: Laurette will enquire when the fast deflector to extract into the LNE 50 line can be pulse for such a test.
 
 
Status of mounting of monitors (Jean)
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  • Three assembled monitors waiting for vacuum acceptance tests
  • Cleaning of bellow units (lab building 107) prerequisite to resume mounting of monitors
    => Francois will ensure that this is on list of urgent activities for the CERN restart and LS2 Day
  • Materiel available:
    • Seven grids (amongst the eight grids of the last batch, one has been made with conductive glue)
    • 11 bellow units repaired in Japan (three or four units with leaks not counted, numbers will be reconfirmed by Jean)
    • (number of available tanks is a potential bottleneck in case vacuum acceptance and installation of monitors takes long)
 
General discussion (status, plans to complete project):
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  • Development to make grids at CERN will not be ready before the likely installation of PUMA
    => Project relies on pieces made in Japan to complete the project (note: PUMA not part of ELENA project)
    => Proper project to be defined in case grids will be made at CERN
  • 14 more grids are needed (11 for ASACUSA, 1 for AEGIS, 2 to complete the ATRAP lines) to complete the project and 7 are available:
    => Another say 15 grids should be produced to have as well spares, to be able to replace a few with many missing wires, and in view of PUMA (to be paid from a separate budget in case this experiment is approved).
    => Christian will contact Masaki
  • Five more bellow units to be ordered (based on cost estimate sent by Masaki) to have spares and the bellow stress test
    => Christian will contact Masaki
  • Bellow stress test planned and important to understand robustness: possibly to be done with one of the units having a (small) vacuum leak on the DN50 feedthrough
  • DN50 feedthrough order: Jean has ordered and is receiving what is needed (for bellow repair attempt at CERN and Masaki?)
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