Outline:

Hw status (on the basis of last LED data); Plans / requests;

ECAL: status and plans

Set of several LED samples with different LED intensity settings in the range [LV(nominal)-1;LV(nominal)] with the step 0.1V

Another stability run, several hours at constant 2 Hz LED rate and [LV(nominal)-0.4V] intensity setting

Poor time alignment, but data can be used to produce preliminary LED intensities adjustment / roughly check hardware behavior.

Further: on 2d-maps LED amplitude is taken not from T0, but from BX with maximal LED signal

LED data (Friday afternoon – Saturday morning)

Hardware status, C-side

8 LEDs missing in previous data, are checked from our side (LED + LED driver + cabling). 3 LEDs of the group 2.06 – bad transporting cables both for voltages and fire signal (repaired, appeared in the data). The rest is OK (our side).

HV box number 4 – replaced with the spare one. DCU shows stable LV behavior.

Run 26679; LED signal, C-side

Unstable cells (run 26679, worse than 6%, C-side)

Majority of unstable cells are grouped in vertical columns. Each group matches one voltage delivery cable / connector on HV-box.

Within one cable: simultaneous change in LED amplitude in all cells

Before data taking: connectors on 6 voltage delivery cables, which showed instability in previous LED sample (26340) were replaced. The behavior of these lines: to be checked.

Run 26679; C-side

Hardware status, A-side

7 LEDs, missing in last data, are checked from our side. 1 LED (2.02.3) – bad transporting cable RJ-45. To be repaired. The rest is operational (on our side).

Cabling check after modification of HV boxes – done last Friday. All mistakes are fixed.

Run 26679; LED signal, A-side

Plans/requests for this week

Detailed analysis of the LED data, collected last Friday / Saturday:

Produce preliminary LED intensity settings; Produce map of dead / unstable cells;

On Friday: take data to check new LED intensity settings;

Next weekend: reserve ECAL PM/LED/PIN systems on both sides for the maintenance (readout is not needed);