Difference between revisions of "Sampling Calorimeter"
(→Cosmic Test) |
(→Cosmic Test) |
||
| Line 115: | Line 115: | ||
* Initial cosmic test could not have the entire calorimeter with HV since Jack has borrowed the Lecroy HV Crate. | * Initial cosmic test could not have the entire calorimeter with HV since Jack has borrowed the Lecroy HV Crate. | ||
* Calo HV on O-01,O-02,O-03,O-04 in ADC channels 0,1,2,3 | * Calo HV on O-01,O-02,O-03,O-04 in ADC channels 0,1,2,3 | ||
| − | * Scint HV on Top left, Top right, Bot 1, Bot 2 in ADC channels 21,22,23,24 | + | * Scint HV on Top left, Top right, Bot 1, Bot 2 in ADC channels 21,22,23,24 . After run 33 adc channels 4,5,6,7 |
* Trigger shown above. | * Trigger shown above. | ||
* Run sheet: | * Run sheet: | ||
| Line 122: | Line 122: | ||
! Run Number !! Start time !! End time !! Events !! Calo HV !! Scint HV !! Comments | ! Run Number !! Start time !! End time !! Events !! Calo HV !! Scint HV !! Comments | ||
|- | |- | ||
| − | 33 || Fri 2-8 16:27:39 || Mon 2-11 11:07:40 || 10593 || 1500, 1500, 1500, 1500 || 1500, 1500, 1500, 1500 || No signal in ADC 22 ( Fix be replacing bad 36ns delay cable) | + | 33 || Fri 2-8 16:27:39 || Mon 2-11 11:07:40 || 10593 || 1500, 1500, 1500, 1500 || 1500, 1500, 1500, 1500 || No signal in ADC 22 ( Fix be replacing bad 36ns delay cable) Calo HV adc chan 0,1,2,3 (did not see 1 & 3, seems to be problem with the ADC cable move to cable with the scintillator signals and put this cabl in the slot for 0-15) |
|- | |- | ||
|} | |} | ||
Revision as of 13:02, 11 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
HV modules were tested by running -2000V across a 5 Megaohm resistor. we measured the voltage out and current out. The histogram below is the percent error in expected current values. The PDF is the charts holding the data taken during the test. Once the HV mosules are back in the TEDF another (more accurate) test may or may not be performed.
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).
Cosmic Test
- Initial cosmic test could not have the entire calorimeter with HV since Jack has borrowed the Lecroy HV Crate.
- Calo HV on O-01,O-02,O-03,O-04 in ADC channels 0,1,2,3
- Scint HV on Top left, Top right, Bot 1, Bot 2 in ADC channels 21,22,23,24 . After run 33 adc channels 4,5,6,7
- Trigger shown above.
- Run sheet:
| Run Number | Start time | End time | Events | Calo HV | Scint HV | Comments |
|---|
