TRT HV System status and plans for LS1

LPI Moscow, K. Zhukov

outline

HV problems in 2012

February 2012 problems

It’s seems there was shortage 450 V pin to the ground. It lead to some

destruction of the board surface. Valera A. found some remains of electrolyte

which caused the shortage. It was some defect in capacitor.

It’s seems there was shortage 450 V pin to the ground. It lead to some

destruction of the board surface. Valera A. found some remains of electrolyte

which caused the shortage. It was some defect in capacitor.

The both crates 003 and 004 were recovered successfully. The opened

part of the HV pins was covered with lacquer for protection. The PFCs were repaired in Dubna and set back in the

PS3500s.To be check: both crates were in the

same rack -> External factor?

The both crates 003 and 004 were recovered successfully. The opened

part of the HV pins was covered with lacquer for protection. The PFCs were repaired in Dubna and set back in the

PS3500s.To be check: both crates were in the

same rack -> External factor?

December 2012 problems

In December we had problems with bottom crate 010 in Barrel. It

happened twice during 10 days. In both cases damages were caused by

some external debris or dust. It caused shortcut in the HV diodes ->

diodes overheating -> breaks

In December we had problems with bottom crate 010 in Barrel. It

happened twice during 10 days. In both cases damages were caused by

some external debris or dust. It caused shortcut in the HV diodes ->

diodes overheating -> breaks

On the surface of the PS3500 board small debris of Al and dust were

found. It points that we should think about HV rack cleanliness (see 2013

plans).The crate was recovered

successfully. The surface of the board was covered with protection

lacquer.

On the surface of the PS3500 board small debris of Al and dust were

found. It points that we should think about HV rack cleanliness (see 2013

plans).The crate was recovered

successfully. The surface of the board was covered with protection

lacquer.

HV crates statusEnd-cap A Barrel End-cap C Crate 006 (OLD) Crate 009 (NEW) Crate 002 (OLD)SC508 3 SC508 10 SC508 5

PFC board (NEW) PFC board (NEW) PFC board (OLD, Upgraded)     Crate 005 (OLD) Crate 010 (NEW) Crate 008 (OLD)SC508 4 SC508 2 SC508 6

PFC board (OLD, Upgraded) PFC board (NEW) PFC board (OLD, Upgraded)

USA 15, spares SR1, TRT SETUP HV SR1, Jola’s firmware test

Crate 003 Crate 007 Crate 004

SC508 SC508 SC508 X, LVs problems

PFC board (OLD,Upgraded) PFC board (OLD) PFC board (OLD, Upgraded)

Over/undershoot events (Jolanta)

HV system 20121. Spare HVM modules were received and calibrated. Ready to use.

2. Spares pool is full. Enough components and spares.

3. UPS line in USA15: There was problem that we had 10A protective element on UPS line and crate have 16 A fuse on input. If there’s trip of crate UPS line would trip. Now it’s OK. For two crates this protective element has 32 A limit.

4. Vitaly Shutov started preparing HV firmware upgrade of SC508 to work with higher baud rate.

5. All crate’s breaks were repaired successfully. November experience said when there’s HV crate trip it’s needed 40-60 mins (thanks to Andrei) to change it for spare one and switch them back to work with TRT.

Timetable for LS1

Timetable for LS1

1. Revise of all HV crate PS3500. Inviting Valera A. for a week to check PS3500 boards for any misbehaves. + over/undershot events explanation.

2. Covering power supply boards with HV lacquer to prevent debris or dust shortcuts. Other maintenance.

3. Cleaning HV racks from dust and debris. Thinking about new ventilation panels in HV racks. Maybe installing some filters.

4. Calibrations of HV cells. Other measurements (stability, checking HV cables etc.)

5. Firmware upgrade for higher baud rate.

6. Devices for fuse burning. Possibility to use them in TRT (V. Kantserov)

Thank you very much!