RICH Status from last RICH meeting Cooling tests HV Power Supplies Operations

CW laser ON From Ross

RICH1 with CW laser ON

VIEW FOR NEW RICH 1 ABUTMENT ALONG Z AXIS Foreseen for the 13th of May, will happen on the first week of June

Schedule for RICH 2 Intervention 16-20 Feb He leak tests (DONE) Starting compressor (DONE) 23 Feb – 6 Mar LHCb week (DONE) LAMS C-side (DONE) 9-15 Mar 16-21 Mar First batch tested tubes @CERN (DONE) Second batch tested tubes @CERN (DONE) 19-26 Mar Exchange C-side tubes* (DONE) RICH2 tests 26-2 Mar-Apr Exchange A-side tubes* (DONE) *A second intervention later in the year is foreseen

February RICH2 Datapoint (from Ross) 40 HPDs have been exchanged C3_0, 2 and C6_1 L0 boards C3 LV Reg. 4/3/2009 R. Young 6

RICH2 after refurbishement databases not yet updated (from Ross)

RICH2 after HPD refurbishment and new CW laser illumination A side C side

Coolant leaks Coolant leaks around RICH1 and RICH2 were tackled and fixed; The Cooling plant + Piping are now being checked by the responsible people to further reduce the leaks

Coolant Loss after the HPD Replacements ~0.44 litres per day

HV “Glitches” U0 HV channel resp. D0 HV Some HV channels show consistently glitches in current (over-) then in voltage (under-) (see last rich meeting from Flavio also). Possible offenders: ISEG, connectors or cable. All our data point to the ISEG (ongoing). ISEG experts have pinpointed where the problem lies and are ready to fix it (whole RICH1 HV supply is travelling now for Dresden). Presentation from Flavio follows.

All current spikes in RICH 1 D: August 2008 – April 2009 Column Sat spike (2-10muA) >10muA R1 D0 61 57 4 R1 D1 9 29 14 R1 D2 41 109 20 R1 D3 5 21 6 R1 D4 1 31 R1 D5 7 R1 D6 12 from Dave

All current spikes in RICH 1 U: August 2008 – April 2009 Column Sat spike (2-10muA) >10muA R1 U0 1 R1 U1 5 R1 U2 8 R1 U3 R1 U4 15 R1 U5 2 13 R1 U6 from Dave

RICH Commissioning and Operation Tests on RICH1 and RICH2 continue: L0 calibrations (reverse voltage cal. for RICH2 achieved by Philip) New mask for noisy pixels Timing tests High rate tests Monitored HV ramps IFB runs MDMS Test with LHCb magnet towards end of July Archiving not yet reliable Update of databases

Reminder: Erich and Olav are welcoming you….. A big thank from the whole RICH collaboration to the people who made the “HPD refurbishing” operation a success! Reminder: Erich and Olav are welcoming you…..