Difference between revisions of "Sampling Calorimeter"
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===Trigger=== | ===Trigger=== | ||
<span style="color:red">TO BE DONE</span> | <span style="color:red">TO BE DONE</span> | ||
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| + | === Scheme of cables === | ||
| + | Scheme of the HERA-B modules. The orientation is as follows: top view with the rack modules at its left. Each module is indicated by its nomenclature (explained above), the DAQ and HV cable number (in red) and the signal cable (sgn). | ||
| + | [[Image:Test-scheme.png|left|200px|Red: the number of the channel (for DAQ and HV label). Sgn: cable signal label.]] | ||
Revision as of 12:50, 1 February 2013
Contents
Links
- pages from HERA-B Technical Design Report
- HERA-B Calorimeter NIM article by G. Avoni et al .Nucl.Instrum.Meth. A580 (2007) 1209-1226. DESY server version
- Conference contribution describing the calorimeter electronics.
- NIM article on the PHENIX EmCal. Phenix Thesis which has sections on the EMCal.
- NIM article on IHEP prototype EmCal for PANDA.
- Test facilities
- Directory of calorimeter papers collected by Zhiwen Zhao.
Test setup
Nomenclature of the modules (could be changed)
In order to identify the different modules, the following structure is used:
X-YY-Z
with:
- X = O (outer) or M (middle)
- YY= 01, 02, 03, 04 ...
- Z (only Middle modules) = A, B, C, D
HV control
- Testing HV supply
Light Leaks sealing
The modules were sealed from light leaks with the use of black tape. To check the sealing, the output of the PMT was measured with an micro-amperimeter, before and after the cover with tape. In top of the pipe, where the PMT is allocated, a gum stopper with slits for the cables, are placed. After many checks it was found that:
- the main light leak come for the joint of the module with the PMT allocation pipe. (Covering it, reduce the current drain from PMT aproximatly in 1-2 orders of magnitude)
- covering the cap of the pipe, doesn't show significant improve.
- covering with tape the side corners of the module, the joint of the top and bottom plastic caps and the union of the pipe with the module reduce the current drain from PMT in 4-5 orders of magnitude.
Outer Modules
For the outer modules, the same PMT was used, with a voltage of 1000 V (max 1900 V) to avoid damage to the PMT.
| Module | Current before | Current after |
|---|---|---|
| O-01 | 15.2 μA | 0.3-0.2 nA |
| O-02 | 10.9 μA | 0.3-0.1 nA |
| O-03 | 48.5 μA | 0.7-0.5 nA |
| O-04 | N/A | 2-1.7 nA |
| O-05 | 34.4 μA | 2-1.4 nA |
Middle Modules
For the middle modules, the same PMT was used, with a voltage of 1000 V (max 1900 V) to avoid damage to the PMT.
| Module | Current before | Current after |
|---|---|---|
| M-01-A | 10.9 μA | ~0.5 nA |
| M-01-B | 24.2 μA | ~0.2 nA |
| M-01-C | 20.9 μA | ~0.2 nA |
| M-01-D | 7.5 μA | ~0.2 nA |
| M-02-A | 38.5 μA | ~0.7 nA |
| M-02-B | 13.1 μA | ~0.4 nA |
| M-02-C | 30.5 μA | ~0.3 nA |
| M-02-D | 10.7 μA | ~0.2 nA |
| M-03-A | 23.9 μA | ~0.7 nA |
| M-03-B | 6.45 μA | ~0.6 nA |
| M-03-C | 3.8 μA | ~0.3 nA |
| M-03-D | 19.2 μA | ~0.3 nA |
| M-04-A | 13.2 μA | ~0.7 nA |
| M-04-B | 6.69 μA | ~0.5 nA |
| M-04-C | 5.3 μA | ~0.5 nA |
| M-03-D | 7.8 μA | ~0.45 nA |
Trigger
TO BE DONE
Scheme of cables
Scheme of the HERA-B modules. The orientation is as follows: top view with the rack modules at its left. Each module is indicated by its nomenclature (explained above), the DAQ and HV cable number (in red) and the signal cable (sgn).
