Status of the Remote HV System 10 June 2015 TileCal week, upgrade session Roméo Bonnefoy, Romain Madar and François Vazeille ● Summary of performances.

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Presentation transcript:

Status of the Remote HV System 10 June 2015 TileCal week, upgrade session Roméo Bonnefoy, Romain Madar and François Vazeille ● Summary of performances ● Next actions 1

Summary of performances ● All the details in a recent ATLAS Note "Performances of a Remote High Voltage Power Supply for the Phase II Upgrade of the ATLAS Tile Calorimeter" ATL-COM-TILECAL (April 15, 2015) Romeo Bonnefoy, Robert Chadelas, Christian Fayard, Daniel Lambert, Romain Madar, Marie-Lise Mercier, Eric Sahuc and François Vazeille All the results were shown in previous TileCal meetings, but for the preliminary noise measurements at the readout level shown today. 2

● Preliminary noise measurements at the readout level -Made on the Demonstrator in the building 175, on the Drawer D1. HV Crate 100 m long cable Internal cable 2.22 m long -LV power supply inside the HV crate, HV Source from Tesla crate. -Noise measurements from pedestal values given by Main Board/Daughter Board set, without/with HV switched on. - DCS data recorded by standard ATLAS DCS on laptop in Building

-Running conditions (Launching of the noise studies at the previous expert week) ▪ PMTs at 700 V. ▪ Short pedestal run HV Off (162 seconds). ▪ Long stability run HV On (13 hours) with pedestal runs of 2 hours.  Noise level for the 2 gains induced by the HV system (Some PMT channels are suppressed  No data or incoherent data between High and Low gains).  "Negative noise“: rms lower when HV On !  Good indication of systematic errors in the pedestal measurements: High gain: from 0.24 to 0.52 channel Low gain: from 0.22 to 1.10 channel  The readout working is no so bad !  “Positive noise“:  0.31 channel always below the systematic errors First conclusion on the HV induced noise: very low and within systematic measurement errors. 4

 HV stability during the 13 hours: from 55 to 89 mV over the 12 channels. Conclusion on the HV stability: very good, in agreement with the whole studies as described in the internal Note. Comment: It is actually the HV stability at the PMT input (See the Note for more explanations). 5

● Summary of performances (More details in the Note) in the ATLAS conditions (100 m long cable) - HV noise ▪ At the PMT input: Below 2.5 mV at 700 V, and constant ratio (noise/HV) = in the range of 300 V. ▪ At the readout level (preliminary results):  0.31 channel within the systematic uncertainties of the measurements. - HV stability :  90 mV, slightly better than in ATLAS running. - No correlation stability/noise, even in the most noisy conditions with the not recommended set-up. - HV drop at the 100 m long cable output: 5 mV. - Other points in relation with the whole electronics in counting room: ▪ Irrelevant points at the detector level: radiations, humidity, temperature, falling materials, handling and access to the electronics. ▪ Easy access and easy connections to the HV Bus boards. ▪ Permanent access to the electronics. 6

Next actions ● Short term actions - Yesterday: second 100 m long HV cable in the Building 175  We will be able to supply 2 Mini-Drawers, preferentially D3 and D4 at the Patch Panel side (At least at Test beam) in order to take benefit of the cable tray routing of internal HV cables (  No fixation problems of HV flat connectors). - In view of the ATLAS test beam installation, works on the HV Test bench: return to Clermont-Ferrand of the 2 HV Opto cards scheme 1 in Bld 175 for a “cleaning” + preparation of other equivalent cards (as spares) + test of transformation of ATLAS cards (Scheme 2) into Scheme 1 cards. - Making of an additional 50 m long cable  Possibility of tests with 150 m long cable (Motion of the Extended Barrels). 7

● Medium term actions - Restart systematic tests of the 2 HV options in a good control of experts  Good readout channels, including good PMTs.  Stable readout. - Qualification of present Multiconductor cables or new ones. - Test beam program: from the installation of the set-up (new 100 m long cables, DCS) to the tests. 8 Patch Panel - Modification of the Patch Panel: slot for routing the 4 HV cables.  Only space for the Blue cable (Diameter of 1.12 cm each).  Locking system.  Information will be given to Gabriel. Slot at the HV side and locking

● Long term actions … with studies already in progress  to come to the final design by following the practical propositions as described in the Note, mainly: - Routing of services in the cavern: only the long HV multiconductor cables. - Minor improvements of the HV Bus boards (Noise killers locations). - Optimization of the space and of the density of cards inside the HV regulation crate: Suppression of support cards recovering the mapping with the prototype cards, implementation of LV and HV commercial bricks, etc. - Individual straps inside regulation crate to switch off failing PMT blocks. - Choice of the final DCS. 9

● New information 10 Interest of the Lisbon team: - Progressive participation aiming the final design as proposed in the Note. - First work: making of an HV Opto card fitting the present support boards of the regulation crate. - Then: ▪ Going to the final designs of HV Bus card and of HV regulation crate, including services (cables) and DCS. ▪ Final goal: to take over this project from the Clermont-Ferrand team, who would play the role of consultant.