Tracker QA Test Station Status

04/19/23 Imperial College 2

Updated QA Scan Definition

• Scan definition:

– One 300 mm scan r to V (11)

– Two 75 mm scans r to X (22, 55)

– Two 75 mm scans r to W (33, 44)

– Absolute minimum required for full channel coverage

• QA parameters:

– Triggers/step: 50k

– Step size: ~27 mm

– No. of steps: 28

– DAQ rate: 38 Hz

– Duration: ~11 hours

V

W

X

11

22 33

44 55

04/19/23 Imperial College 3

Data Acquisition Schedule

TUE 30/10/07

WED 31/10/07

THU 1/11/07

FRI 2/11/07

SAT/SUNMON

5/11/07TUE

6/11/07WED

7/11/07THU

8/11/07

Station AM PM AM PM AM PM AM PM AM PM AM PM AM PM AM PM AM PM

6

7

9

10

11

Install Station: ~3-4 hours

QA Scan: ~11 hours

• 5 stations scanned by the afternoon of Thursday 8th November

04/19/23 Imperial College 4

Safety Interlock Systems (1)

• Power Supply:

– Currently, mains equipment individually protected with circuit breakers but compressor running from unprotected 3 phase supply

• When power restored after blackout, mains equipment remains off but compressor restarts – potentially harmful

– IC electricians asked to provide solution:

• New high capacity 3 phase line installed

• Split into ‘normal’ 3 phase and mains supplies at breaker box

• Blackouts cause breaker box to trip – switches off ‘root’ 3 phase supply, protecting both mains equipment and compressor

• N.B. Only one particular type of trip switch will work with compressor! IC electricians will provide details of setup, for replication at RAL…

– New supply installed in parallel with existing one – no disruption to data taking

– Work complete on Wednesday 31st October, but intend to continue using old supply during current intensive 5 station QA run

04/19/23 Imperial College 5

Safety Interlock Systems (2)

• Smoke Detector:

– Craig has ordered Vesda Laser Focus 250 smoke detector system

• Should arrive by the end of the week

– Alarm signal will turn off AFEIIt power supply

– IC electricians propose additional (standalone) relay switch between main 3 phase breaker box & AFEIIt PSU

• All electricians busy at the moment, so haven’t yet identified suitable relay (should be able to start looking by the end of the week…?)

– Will also need to request Mechanical Workshop time for installation of Vesda tubing system (for ‘sniffing’ AFEIIts)…

04/19/23 Imperial College 6

Safety Interlock Systems (3)

• Cassette Pressure, Lid Temperature/Water Alarms:

– Should just turn off AFEIIt PSU & compressor

– However, in order to shut down compressor, must be wired into main switch of 3 phase breaker box

• Will therefore turn off all equipment (but should not be a problem…?)

– Request technical documentation for alarm signals, as electricians will need to build interface control logic

– Installation will most likely require significant downtime of breaker box supplies

• Either switch back to unprotected supply for duration of work, or move over to the new protected mains & 3 phase supplies after alarm control logic has been fitted

04/19/23 Imperial College 7

Summary

• Time-optimised scan pattern defined

• First 5 stations to be QA scanned by the 8th of November

• Power supply safety interlock in place

• Work progressing on remaining safety interlock systems