ICARUS Ground Short Saga (w/ plans and recommendations) Linda F. - - PowerPoint PPT Presentation

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ICARUS Ground Short Saga (w/ plans and recommendations) Linda F. Bagby August 14, 2019 Outline How the system works Findings to date Plans and Recommendations 2 8.12.19 Linda F. Bagby | ICARUS Technical Working Group Impedance

SLIDE 1

Linda F. Bagby August 14, 2019

ICARUS Ground Short Saga (w/ plans and recommendations)

SLIDE 2

How the system works
Findings to date
Plans and Recommendations

8.12.19 Linda F. Bagby | ICARUS Technical Working Group 2

Outline

SLIDE 3

ZMon1 ZMon2

T-300 1 T-300 2

1.4kHz stimulus current from ZMon1 OR ZMon2 Bond in middle of T-600. Matching inductor response curves. Matching cable length L to T-300. CT: 1V/1A, resolution ~10mA. Rogue R decreases current seen by specific CT. Detector ground cable must be bonded

pposite and symmetrical on T-300s.

CT1 CT2

Impedance Monitoring

SLIDE 4

Began in earnest June 27
Day to day updates are in the SBN elog and DocDB #12639
A variety of sources were found for two types of shorts

– Stable direct connection – Vibrational intermittent

8.12.19 Linda F. Bagby | ICARUS Technical Working Group 4

Ground Short Search

SLIDE 5

8.12.19 Linda F. Bagby | ICARUS Technical Working Group 5

Short Source Gallery

SLIDE 6

8.12.19 Linda F. Bagby | ICARUS Technical Working Group 6

Photo Gallery

SLIDE 7

Friday afternoon, August 9, an 18W short developed and disappeared.

– An effort was made to resolve the short. No definitive source was found.

Friday evening, between 7-8:40PM another intermittent, resistive short

(33W) developed and disappeared. Appears to be vibrational in nature. Do not know if anyone was on the top plate.

8.12.19 Linda F. Bagby | ICARUS Technical Working Group 7

Current Status

SLIDE 8

Plans

– Due to the sensor cable shield finding, all currently installed cables, attached to detector referenced sensors from Cryogenic cabinet electronics, are being inspected and heat shrink applied to cover trimmed foil edge. – All subsequent sensor cables will be terminated in the same fashion.

Recommendations: ACTIVE ALARM

– While working on the top plate, be aware of the alarm. – If the alarm sounds (gong) and the beacon illuminates (flashing orange), stop what you are doing and try to resolve the source. – The normal display impedance value is ~68-73W. – If unable to resolve, send email to bagby@fnal.gov. – Record where the work was being done, the time, and monitor display values in the elog. – If you know what is causing the short but need to finish the job, try to remove the short before you leave for the day.