GIF tests status report: uninstallation data taking ended last Wed. - - PowerPoint PPT Presentation

GIF tests status report: uninstallation

• F. Legger – MPI, May 14, 2008
• data taking ended last Wed.
• Equipment removal till last Friday
• tnx Joerg v. Loeben and Steffen!!
• Lead bricks and holding structure removed yesterday with

the crane

• LMU driver will bring everything back to Munich on May 23

GIF tests status report: data

• F. Legger – MPI, May 14, 2008
• 14 M + 4 M + 2 M + 120k = 20 M evts collected
• Threshold scan (34-36-38 mV) ~ 1M evts each;
• Counting rate scan (0, 800, 1100, 1500 Hz/cm2) ~ 1 M evts each;
• HV scan (2700V, 2745V) with source on/off ~ 1 M evts each;
• Atlas settings for electronics with source on/off ~ 1 M evts each;
• Time over Threshold scan with source on/off and threshold scan

(34-36-38-40-42-44 mV) ~ 10k evts each.

Tnx to the GIF crew: Felix, Markus, Jurgen, Carl-Friedrich, Julia, Albert, myself

Analysis status

• F. Legger – MPI, May 14, 2008
• Calibration nutples produced for all runs taken so far;
• Meeting on Friday with Oliver and Felix to best coordinate

analysis efforts;

• Albert started working on Garfield simulations and sent first

plots (limited statistics).

GIF tests: the future

• F. Legger – MPI, May 14, 2008
• Test a prototype chamber

(surface ~1 m2);

• GIF is booked till the end of

2008, but can be used till end 2009;

• We will probably be ready to start

beginning 2009;

• Concern about setup

dimensions: 1.2 m (width) x 2.5 m (length).

Gas DAQ

GIF

Gas DAQ

GIF

Gas DAQ

GIF

COMPASS ATLAS

spare slides

02/08/08

• F. Legger

6

The setup at the GIF

Gas DAQ Source Cs 137 590 GBq ATLAS COMPASS LHCb

02/08/08

• F. Legger

7

The setup at the GIF

LHCb MWPC chamber 6 1-m-long small tubes

02/08/08

• F. Legger

8

Our dangerous DAQ

cabling which will have to be redone by May 1st GIF entrance

02/08/08

• F. Legger

9

The setup at the GIF: a closer look

COMPASS LHCb cosmic muon

• ref. chambers 50 cm

long standard MDT tubes 6 1-m-long small tubes

02/08/08

• F. Legger

10

The setup at the GIF: the trigger

COMPASS LHCb cosmic muon

big scintillator moved from top to in between the two bottom layers 2 layers of 6 scintillators each

Scintillators shielded by 120 lead bricks!

02/08/08

• F. Legger

11

GIF tests: shielding

LHCb MPWC

drawing not to scale! reference chamber lower multilayer shielded by Pb wall small tubes and upper multilayer shielded by LHCb chamber

02/08/08

• F. Legger

12

GIF tests: drift time spectra (no irradiation)

• threshold 38 mV
• first hit, no tracking

t max ~ 200 ns

02/08/08

• F. Legger

13

GIF tests: drift time spectra (no irradiation)

• threshold 38 mV
• first hit, no tracking

t max ~ 700 ns

02/08/08

• F. Legger

14

GIF tests: drift time spectra (full irradiation)

• threshold 36 mV
• analysis needed!

Lead shielding