Difference between revisions of "Sampling Calorimeter"
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**[http://iac.isu.edu/scheduling2.html Idaho] (<48MeV electron) | **[http://iac.isu.edu/scheduling2.html Idaho] (<48MeV electron) | ||
*[https://www.dropbox.com/sh/365le2o93vpn14e/4UjwvSl7aM/other_calorimeter Directory] of calorimeter papers collected by Zhiwen Zhao. | *[https://www.dropbox.com/sh/365le2o93vpn14e/4UjwvSl7aM/other_calorimeter Directory] of calorimeter papers collected by Zhiwen Zhao. | ||
+ | *[http://hallaweb.jlab.org/12GeV/SuperBigBite/SBS-minutes/2013/Report_HERA-B_modules-2013-02-06.pdf SBS Meeting 06/02/2013] presentation of Carlos Ayerbe | ||
== Test setup == | == Test setup == |
Revision as of 14:23, 6 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.
- SBS Meeting 06/02/2013 presentation of Carlos Ayerbe
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
This is the flow chart for the current trigger logic. We are using 3 scintillators; 1 double sided (2PMTs) on top, and 2 separate scintillators on bottom. The difference between threshold voltages is to match gains, this was not done by adjusting HV since presently using HV units with dual outputs for one HV setting.
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).