1. IHEP group Shashlyk activity towards TDR
28 Jan 2005
IHEP group Shashlyk activity towards TDR
Pavel Semenov IHEP, Protvino
on behalf of the IHEP PANDA group
PANDA collaboration meeting, GSI
2-6 March 2009

2. Pavel Semenov, PANDA collaboration meeting, GSI
28 Jan 2005
Outline
Mechanical design of the calorimeter
Assembling and maintenance
MC simulations
Last run results
2-6 March 2009
Pavel Semenov, PANDA collaboration meeting, GSI

3. Overall design of the FS EMC
27x14 modules
(4cells each)
Massive closed frame
Back plate to fix modules
in Z direction
(modules position from
one side and
photodetectors from the
other side of the plate )
Accelerator pipe hole
(2x2 modules) shifted
from the center
Dedicated rail system
for maintenance procedure
2-6 March 2009
Pavel Semenov, PANDA collaboration meeting, GSI

4. Pavel Semenov, PANDA collaboration meeting, GSI
Detector sizes
Active zone 2970x1540 mm2
2-6 March 2009
Pavel Semenov, PANDA collaboration meeting, GSI

5. Shashlyk module tail stucture
Two types of possible mounting
of the module: 4 tubes or 1 screw
2-6 March 2009
Pavel Semenov, PANDA collaboration meeting, GSI

6. Pavel Semenov, PANDA collaboration meeting, GSI
Shashyk module sizes
2-6 March 2009
Pavel Semenov, PANDA collaboration meeting, GSI

7. Calorimeter assembling
Modules installation:
layer by layer,
positioning each
module according to
the back plate holes
2-6 March 2009
Pavel Semenov, PANDA collaboration meeting, GSI

8. Calorimeter assembling (press bars)
Press bars to minimize the gap between modules and fix positions
2-6 March 2009
Pavel Semenov, PANDA collaboration meeting, GSI

9. Calorimeter at the maintenance position
To provide a possibility
of Shashlyk maintenance
A dedicated extensible
rail system is proposed.
Calorimeter can be
shifted out to the left or
the right side of the
Forward Spectrometer.
At the working position
it fixed by lock pins with
high precision
2-6 March 2009
Pavel Semenov, PANDA collaboration meeting, GSI

10. Pavel Semenov, PANDA collaboration meeting, GSI
Calorimeter rollers
2-6 March 2009
Pavel Semenov, PANDA collaboration meeting, GSI

11. Fast MC (photons energy distribution)
All photons energy (upper curve)
over photons at the Shashlyk
aperture (color curves)
2-6 March 2009
Pavel Semenov, PANDA collaboration meeting, GSI

12. Time between energy depositions (one cell)
Near pipe
Detector vertical edge
2-6 March 2009
Pavel Semenov, PANDA collaboration meeting, GSI

13. Pavel Semenov, PANDA collaboration meeting, GSI
Testbeam setup
DC1
M14
DC2
DC3
DC4
ECAL
Target
Beam S3 S2 S1 St SA
Spectrometer consisted of 4 drift chamber stations and a magnet to measure beam particle momentum precisely
Calorimeter prototype
Al target at 1.5m and 3 m before the prototype
2-6 March 2009
Pavel Semenov, PANDA collaboration meeting, GSI

14. Testbeam results for 1.5 m (more sophisticated analysis)
Shower profile fit,
Charged hadrons removed (drift chamber),
Rough calorimeter calibration
π0 1-2 GeV, σm 12.5 MeV
Next steps:
Precise calibration,
All data analysis,
Big and small cell
performance comparison
2-6 March 2009
Pavel Semenov, PANDA collaboration meeting, GSI

15. Open questions to answer before TDR
Shashlyk module length
Size of the cell (55 mm vs 110 mm)
Readout electronics
Full MC
2-6 March 2009
Pavel Semenov, PANDA collaboration meeting, GSI

16. Pavel Semenov, PANDA collaboration meeting, GSI
Backup slides
2-6 March 2009
Pavel Semenov, PANDA collaboration meeting, GSI

17. Registered neutral pions energies at 3 m target position
2-6 March 2009
Pavel Semenov, PANDA collaboration meeting, GSI

18. Energy and position resolution in “big” modules
σE /E = 3.5/E  2.8/√E  1.3 [%], E in GeV
σx = 13.1/√E  4.0 [mm], E in GeV
2-6 March 2009
Pavel Semenov, PANDA collaboration meeting, GSI

19. New prototype parameters
64 cells (16 supermodules) assembled in matrix
380 layers of 0.3-mm lead and 1.5-mm scintillator, total length 680 mm
Transverse size 55x55 mm2
Effective Moliere radius: RM=59 mm
Effective radiation length: X0=34 mm
Total radiation length: 20X0
Light collection: 36 fibers BCF-91A (1.0 mm)
2-6 March 2009
Pavel Semenov, PANDA collaboration meeting, GSI

20. Prototype modules production
2-6 March 2009
Pavel Semenov, PANDA collaboration meeting, GSI

21. Prototype testbeam setup
2-6 March 2009
Pavel Semenov, PANDA collaboration meeting, GSI