Roman Pot Status

Gennaro RuggieroTOTEM Week Collaboration Meeting December‘08

Review since the last Coll. Meet.

• Status of Production– Production Planning (until pot #12)

• Tests/Commissioning in H8 and IP 5

Production Planning (I)

• The construction of each Detector Package requires a sequence of operations which lasts more than 1.5 months .

• This planning is meant to be “no earlier than ...”

• During this sequence we also need services/technician which belong to other groups/experiments and the sharing of resources is not always obvious

Production Planning (II) Definition of all the tests for the “pot” before going to the tunnel + finalisation of the DCS requirements

Same production logic for all pots; critical part: hybrid construction

“IP5 Installation” means: ready for IP5 Installation

RP hybrids: actual status

Failures and Reworks: • Bottleneck of the production chain is the VFAT test• After failing tests only 8 VFATs replaced so far. The replacement of the VFAT has always

turned in a positive test result

The construction of the RP hybrid is made of an alternated sequence of mounting and inspecting/testing steps. The failure at different steps is followed by further investigation and relocation of the hybrid to a rework slot.

Hybrids in the production chainProduction Step Bare PCB SMD VFAT Sensor Bars Total

not tested yet tested OK * 12 14 0 5 5 10 10 1 57

 Hybrids in rework  

PCB rework SMD rework VFAT reworkUnder

evaluation Rejected  20 15 15 14 2 66

ProductionFor what is available we should not have (major) problems in following the planning until Pot6

* Production not fully delivered, ~1/4 had been rejected for black pad

Pot # Location Status1 rp_45_220_fr_hr commissioning2 rp_56_220_fr_hr commissioning

3 H8 under test

>>> Not to forget:

Beam test to Cosmic rays test setup in H8• Detector package position swapped to the “cosmics position”• Detector package with the thin window inserted in a stainless steel

(vacuum) vessel with thin plastic windows• Cosmics selection by 4 scintillators (2 top and 2 bottom of the package) • Low rates... Long data taking (test results shown by Valentina)• Moreover, presence in H8 needed all the time:

• Low Voltage/High Voltage manual• Cooling/ Vacuum: manual control and online monitoring

• Cooling plant operating Pot #3, Thermo-model and dummy heat load

Pot #3 in cosmics position

H8 cooling

Point 5: RP cooling

valves

PLC rack

C3F8 storage tank

compressors

dummy load

USC 55 • Cooling plant ready in USC 55 since months• Piping serving stations at 220m completed

(both sides)• Piping serving stations at 147m will be

completed in January ’09• Controls, monitoring, warnings and alarms

running on station (only) .

• First cooling liquid flowing in the 2 installed pots in October

• Temperature/pressure data monitoring at the station with its own controls and in the Pot with the mini-dcs prepared by Vic’s group

• Absence of a real DCS obliges presence in IP5 for all the duration of the test

Plane 3 and 8 at -35°C (electronics OFF)

Point 5: Commissioning of the RPsLately we had an “exercise” at point 5 for 3 days. The objective was to run the RPs ( cooling, low/high voltage, environmental sensors monitoring) and start the commissioning of the DAQ in IP5 (see Emilio’s talk as well).

Negative Points• This has required the presence in loco of about 11 people (also at same time...)• Very hard working conditions at the moment• Among other things, limited by shut-down programs in CMS and Tunnels of which we

were not aware of.• No chances of redoing this exercise before end January 09

Positive Points• Cooling plant Ok• Environ. monitoring cumbersome but OK• One scan on the pot 56 (readout via S-Link)• LV delivery seemed OK, but monitoring still

not fully understood• Good restaurant in Cessy...