S. Zelepoukine CMS Electronics Status Report: ECAL Detector Control System S. Zelepoukine IHEP Protvino/ETHZ

S. Zelepoukine CMS Electronics Outline Precision temperature monitoring Humidity monitoring Temperature safety system (TSS) Preshower Software (PVSS) H4 testbeam 2003 Bld.867, DCS lab, other activities Conclusions

S. Zelepoukine CMS Electronics Precision temperature monitoring monitor temperature stability (thermal screen, grid). precision required : at least 0.01 deg (relative). sensors: Betatherm Thermistors (NTC) — approx. 500 (EB+EE) sensor location (in a SM, similar in EE quadrant): grid — 1 sensor in each module; thermal screen — 1 sensor in each module; IN/OUT cooling pipes — 2 sensors per SM. Total: 10 sensors per SM (EE quadrant) readout (several options are considered): Keithley multimeter with/without a remote transducer; ELMB with/without a remote transducer (a backup solution).

S. Zelepoukine CMS Electronics Precision temperature monitoring Status — sensor probes: Exact sensor location is defined (symmetrical in SM). Sensor probe design is finalized (grid + thermal screen). Immersion probe for In/Out cooling pipes: OK for SM0 (F.Mossiere); To be defined for SMx. Sensor installation procedure: defined for the thermal screen; to be defined for the grid and In/Out pipes. Sensor cabling inside SM: use flat cable (or single twisted pairs); reconsider patch panel connector (crimped / IDC ?). Preliminary offers obtained : ~ 10 CHF per sensor (factory pre-calibrated!)

S. Zelepoukine CMS Electronics Precision temperature monitoring Sensor positioning on the thermal screen SM0 SM1,... SM0,... Sensor positioning on the grid

S. Zelepoukine CMS Electronics Precision temperature monitoring Sensor positioning on cooling pipes (immersion probes) F.Mossiere, EST/ME

S. Zelepoukine CMS Electronics Temperature probe (V.3) 10 mm 17 mm 10 mm 2x holes diameter = 3 mm Temperature probes to be installed on the thermal screen and on the grid. Material — aluminium alloy; therm.conductivity k = 170 W/m * K Screws (2.5mm) Alumin. plate 10 mm section

S. Zelepoukine CMS Electronics Temp.probe – finite element model Delta T = 1 K (plate – air) Delta T = 0.06 mK (sensor location) A.Riabov (IHEP, Protvino)

S. Zelepoukine CMS Electronics Precision temperature monitoring Status — readout: ELMB will still be used for the setup in H4 / Bld.867. In the meantime, Keithley [+ T-MUX] options are to be tested. Transducer (T-MUX) is under development: T-MUX = analog multiplexer + RBFE ASIC (LHC/ACR) Non rad-hard MUX (Maxim) irradiated at PSI (Dec.02), see CMS Int.note; Results are negative for high rad.doses (>10 years inside ECAL): parameters are not stable enough for required precision. Can still be considered if placed on the balcony and periodically replaced. Rad-hard MUX (EP/MIC) considered to be used for the second T-MUX version. For this I 2 C remote connection has to be implemented. Prototype PCB is produced at IHEP (Andrei Sidorov, IHEP); should now be assembled and tested in the lab — no irradiation testing required. Keithley tests in the lab (Alison Lister, ETHZ) long cables (~ 100m) — switching rate, noise effects; 2-wire / 4-wire sensor connection.

S. Zelepoukine CMS Electronics Precision temperature monitoring Switching_ 2_ point, integration time= 0. 5s Keithley measurements: 2-wire connection, long cable Alison Lister, ETHZ 0.01 Ohm

S. Zelepoukine CMS Electronics Humidity monitoring Collaboration with CMS Tracker DCS (A.Tsirou) for sensor study and selection. Also, sensor electronics. Several types of sensors being tested in the Tracker lab. New sensors from Hygrometrix at medium price (~ 15 CHF). Irradiation tests at PSI will start soon (in 1-2 weeks). Non rad-hard sensors will be used in H4 setup (to obtain experience; provide input for integration).

S. Zelepoukine CMS Electronics Temperature Safety System (TSS) TSS (VINCA, Belgrade): Preparing for SM0, SM1. (to be defined: exact sensor location, probe construction) The same functionality as at M0’ (interlocks). RBFE based board — testing is in progress in Belgrade.

S. Zelepoukine CMS Electronics Temperature Safety System (TSS) Prototype PCB is under test — RBFE + multiplexer for 8 channels

S. Zelepoukine CMS Electronics Preshower DCS for Preshower: Preshower DCS will not just cover cooling control and temperature monitoring, but also safety monitoring. NCU Taiwan will take up the DCS for preshower. Manpower: Apollo Go and Chia-Ming Kuo. Started to look into using PLC's (Apollo) and soon PVSS (Ming) Made some cost estimate (Dave Barney) Study of cabling (Piet Wertelaers) Will soon write a specification document (Apollo and Dave)

S. Zelepoukine CMS Electronics Software Software developments (Alison Lister, ETHZ): working on Supervisory System (FSM); HV application; Cooling system application; Plans to implement LV application; studying methods to access non-PVSS database. Igor Lobov just has started with PVSS at IHEP, Protvino.

S. Zelepoukine CMS Electronics Software PVSS Panel for Cooling Unit:

S. Zelepoukine CMS Electronics H4 testbeam 2003 Finishing sensor installation — SM0; testing in Bld.27 (?) Preparing sensor readout (ELMB + CANbus) and PC in H4 Integration of PVSS applications Provide the “PVSS — data acquisition system” interface Support the Endcap EE0’ tests in H4 — use same setup (?)

S. Zelepoukine CMS Electronics Bld.867, DCS lab, other activities A setup needs to be defined to support DCS related activities in Bld.867 (all sensors must be verified for proper operation after installation). PC/PVSS + ELMB ? DCS lab is now existing! Bld.892-R-B11 Concentrate all hardware related work there (probe production, testing, readout electronics testing, sensor calibration, etc.). Sensor database has to be created and maintained.

S. Zelepoukine CMS Electronics Conclusions Sensor installation is close to the final solution (sensor location, probes, cables, connectors) Temperature sensors/probes — preparing for production. Humidity sensors should be selected soon — based on irradiation tests at PSI. Sensor readout still to be defined from several options under consideration and testing (T-MUX, RBFE, Keithley, ELMB). Will concentrate on readout and CMS integration after the sensor installation work on SM0 is completed. Software developments — good progress.

S. Zelepoukine CMS Electronics Backup slides

S. Zelepoukine CMS Electronics Temp.probes in cooling pipes F.Mossiere, EST/ME

S. Zelepoukine CMS Electronics Temp.probes in cooling pipes F.Mossiere, EST/ME

S. Zelepoukine CMS Electronics Temp.probe : finite element model 0.06 mK

S. Zelepoukine CMS Electronics Temp.probe : finite element model