Ps spd final cosmic results
This presentation is the property of its rightful owner.
Sponsored Links
1 / 25

PS/SPD final cosmic results PowerPoint PPT Presentation


  • 33 Views
  • Uploaded on
  • Presentation posted in: General

PS/SPD final cosmic results. Calibration of PMTs with masks Cosmic results. PMT calibration with masks.

Download Presentation

PS/SPD final cosmic results

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Ps spd final cosmic results

PS/SPD final cosmic results

  • Calibration of PMTs with masks

  • Cosmic results

Commissioning meeting, CERN


Pmt calibration with masks

PMT calibration with masks

  • During the cosmic data taking there were few PMT calibrations done using blue and green LEDs. Pixel gain coefficients obtained during different calibration runs show good reproducibility and stability of the setup.

  • Also to study the effect of pixel uniformity two masks was used :

    • 02-05-2006: mask with one hole d=1.5 mm on pixel

    • 06-07-2006: real mask with two holes from CF

Commissioning meeting, CERN


1 hole mask

1-hole mask

Light (ph.el.) measured on each of 64 pixels with and without mask for each PMT is shown on figure. Mask effects mainly the first and the last 8 pixel rows. Also the non-uniformity (read-out) appears to be significant. Q.E. is measured for PMT1-4: 12.%, 10.8%,11.8%, 12.2%. For data analysis for PMT2-4 is taken value of CF 10.7% 11.53% 12.6%.

Commissioning meeting, CERN


Real mask with 2 holes cf

Real mask with 2 holes (CF)

On the right figure: Light (in phel) on pixels of PMT2: 1-h mask, no mask, CF mask. The difference between masks is ~20%, mainly on 1-st and last 8 pixels.

On the left figure: Ratio of gain coefficients for PMT2 pixels with/without mask : 1-h mask and CF mask. Effect of masks is about +-10%.

Commissioning meeting, CERN


Ps uniformity

PS uniformity

There are 100 optical cables connect PS modules to the PMTs, usually 4 PS elements

(64 cells) per PMT. Uniformity of detector response within single PMT is important.

On the figure the result for modules p51, p57, p71, p127 is shown as an example of data presentation. On the top plot the light yield for each module is plotted in ph.el. The red lines indicates +-20% corridor.

On the bottom the histogram of responses normalized over PMT.

The file with all data is attached to the agenda of this meeting.

Commissioning meeting, CERN


Ps uniformity1

PS uniformity

Variation of the detector response for single PMT is shown on figure. Inside the window [0.8:1.2] there is 95% of cells, inside [0.7:1.3] is more than 99%.

The variation of the response within each PS element (16 channel = small optical connector) is about 6%.

Commissioning meeting, CERN


Ps light yield

PS light yield

All low signals from Load5, PMT2, adc ch. #9 (pixel # 63)

-> deffect of measurement?

Distribution of the light yield (ph.el.) in PS cells.

Commissioning meeting, CERN


Calibration coefficients pmt2

Calibration coefficients PMT2

Gain of this pixel was changed ~2 times. Probably, due to extra illumination with LED during run with Load5.

Commissioning meeting, CERN


Average light yield for single pmt

Average light yield for single PMT

Distribution of the average light yield (ph.el.) for each PS PMT.

Commissioning meeting, CERN


Spd light yield

SPD light yield

Distribution of the light yield (ph.el.) in SPD cells.

Commissioning meeting, CERN


Spd uniformity

SPD uniformity

Variation of response in SPD cells is shown for each detector element and for each PMT. On the bottom plots there are integral probability curves are shown. Width of distribution within detector element is 5.7% (sigma).

Commissioning meeting, CERN


Average light yield for single pmt spd

Average light yield for single PMT (SPD)

Distribution of the average light yield (ph.el.) for each SPD PMT.

Commissioning meeting, CERN


Backup slides

Backup slides

  • Distribution of responses normalized for PMTs: separately for each PS SM.

  • Distribution of responses normalized for PMTs: separately for each SPD SM.

  • “Bad” modules and channels with low LY: example.

Commissioning meeting, CERN


Loads logbook

Loads logbook

Totals:

212+164+104+272=752 groups (12032 cells)

“BAD” modules (average l.y. ~14 (15) ph.el.):

s71(11),

p163, p166, p168, s81(2), s169(7), s170(6)

p172(8),s23, s39, s41, s56, s101

p13(3), p73(4)

% Loads: SMs and PMTs in cosmic stand

Load2={'SPD1''SPD2''PS5''SPD4'};

Load3={'SPD6''PS6''PS2''PS7'};

Load4={'SPD8''SPD7''PS1''PS8'};

Load5={'SPD5''PS4''SPD3''PS3'};

PMT 1: SPD1, SPD5, SPD6, SPD8

PMT 2: SPD2, SPD7

PMT 3: SPD3

PMT 4: SPD4

PMT 2: PS4, PS6

PMT 3: PS1, PS2, PS5

PMT 4: PS3, PS7, PS8

Commissioning meeting, CERN


Ps uniformity 1

PS uniformity - 1

PMT 2: PS4, PS6

PMT 3: PS1, PS2, PS5

PMT 4: PS3, PS7, PS8

Commissioning meeting, CERN


Ps uniformity 2

PS uniformity - 2

Commissioning meeting, CERN


Spd uniformity 1

SPD uniformity - 1

PMT 1: SPD1, SPD5, SPD6, SPD8

PMT 2: SPD2, SPD7

PMT 3: SPD3

PMT 4: SPD4

Commissioning meeting, CERN


Spd uniformity 2

SPD uniformity - 2

Commissioning meeting, CERN


Load2 modules 17 phel and channels with low ly 13 phel

Load2: modules (<17 phel) and channels with low LY (<13 phel)

Commissioning meeting, CERN


Load3 modules with low ly 17 phel

Load3: modules with low LY <17 phel

Commissioning meeting, CERN


Load3 channels with low ly 13 phel

Load3: channels with low LY <13 phel

Commissioning meeting, CERN


Load4 modules with low ly 17 phel

Load4: modules with low LY <17 phel

Commissioning meeting, CERN


Load4 channels with low ly 13 phel

Load4: channels with low LY <13 phel

Commissioning meeting, CERN


Load5 modules with low ly 17 phel

Load5: modules with low LY <17 phel

Commissioning meeting, CERN


Load5 channels with low ly 13 phel

Load5: channels with low LY <13 phel

Commissioning meeting, CERN


  • Login