SciFi test procedures and commissioning

Module Assembly and QA at CERN

Cframe Commissioning

The goal is to ensure that the assembled SciFi module didnt degrade at different steps of Cframe assembly and commissioning. The existing measurements during module and module+CB assembly have to be compared with the measurements on the C-frame.

There are a few main steps during integration in Cframe.

* Mounting modules on Cframe: visual inspection and Survey of positions

* Cooling/Dry gas connection: check gas tightness and DuePoint at different conditions, including temperature, dry gas flux rate.

  • First one can check the gas tigthness of every ColdBox using same procedure as at the CB assembly (syringe), compare leaks for different module positions with former measurements.

  • Second the gas tightness can be checked with the dedicated system at maximum flow. The setup allows measurement of the input flow after the dry gas plant and the individual outputs for each CB. The procedure can be as following(preliminary): connect all outputs to the setup and then connect input of CB one by one. For each connection flush at maximum rate, wait for stabilisation and measure difference between input and output fluxes. Then connect another box and repeat the measurements observing individual output fluxes and the stability of input flux. This way the measurements with dedicated setup can be calibrated with respect to the former measurements. The measurements can be repeated at different temperatures, and together with DP measutement in longterm test.

* Power (HV/LV) connection. During module QA the dark current is measured for each SiPM TopCover at nominal (Vbd) voltages(precision of 0.1uA). This can/has be compared with measurements on Cframe. Small difference can be expected due to temperature.

* Readout and LIS calibration. The module QA provides the Ibias, Imod currents for each LIS driver for two different settings. And the mapping of each driver to the light bar, which is not the same for each module. The LIS LY measurements during QQ using Spiroc can be compared withthe PACIFIC mesurements via S-curve. Because of different integration time the optimisation with SPIROC may not suit the PACIFIC readout, this has to be clarified eg. by comparing S-curve, as well as different threshold calibration algortihms.

* Longterm and cooling tests. The performance of Cframe has to be verified during long term operation at different temperatures, and using thermocycling. Possible parameters to be monitored:

  • environments; temperature, leak rate, DP

  • Noise rate at different threshold settings (random trig.)

  • regular S-curve measurements stability check.

There is also a possibility to build a simple cosmic setup comprising 2.5x0.2m hodoscope(exists at RWTH) mounted on top of the C-frame, and measure inclined tacks using testbeam like trigger synchronization procedure. One can get about 100 hits/channel in 24-48h operation for the whole C-frame readout.

Finally the detailed procedure of Cframe commissioning sequence and QA parameters have to be agreed.

-- ValeryZhukov - 2018-08-03

  • LHCb-INT-scifi.pdf: Test procedure and QA during production, integration and commissioning

Topic attachments
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PDFpdf LHCb-INT-scifi.pdf r2 r1 manage 324.4 K 2018-08-10 - 15:03 ValeryZhukov Test procedure and QA during production, integration and commissioning
Unknown file formattex Main.tex r1 manage 23.2 K 2018-08-03 - 18:06 ValeryZhukov tex file
PDFpdf scifi22092018.pdf r2 r1 manage 346.7 K 2018-09-24 - 14:45 ValeryZhukov  
PDFpdf scifi22092018_v2.pdf r1 manage 346.7 K 2018-09-24 - 14:50 ValeryZhukov  
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Topic revision: r6 - 2019-05-23 - ValeryZhukov
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