The ATLAS Tile Calorimeter LVPS hardware upgrade and testing.

Transcription

1 HEPP Workshop 2019 Nelson Mandela University The ATLAS Tile Calorimeter LVPS hardware upgrade and testing. Wits Institute for Collider Particle Physics Speaker: Edward Nkadimeng Supervisor: Prof. Bruce Mellado

2 Outline Background/Introduction Board Physical description Test Stand Diagram/Current Wits Test station Burn-In Station Software Guidelines and goals for the LVPS test station Future tasks HEPP Workshop 2019 Nelson Mandela University 2

3 Background ꙮ TileCal samples energy and interacts with scintillating tiles within system. ꙮ TileCal consists of 4 barrel sections along beam path each compromising of 64-like wedge segments. ATLAS Collaboration, 1996 ꙮ Low Voltage Power Supply (LVPS) positioned within each wedge. HEPP Workshop 2019 Nelson Mandela University 3

4 Introduction LVPS consists of an array of eight, identical power supplies (bricks). Combination of radiation hardened bricks, correspond with the operating environment. LVPS must remain radiation hardened to single-event as well as total dose accumulated over several years. Step down from 200V to 10V. HEPP Workshop 2019 Nelson Mandela University CERN-LHC,

5 Signal Isolator Signal Isolator Transformer Continued V - To EL MB Start / Stop Contr ol OVP, OCP, Temp, LC Filter R SHU NT Ru Stop n Over Temp V OUT I * OUT* IR211 0 Drive r LT1681 Control ler GN D PRI + V PRI - PRIMARY SIDE Control Supply V FB I F B + V SEC - LC Buck SECONDARY SIDE R SHU NT + Vout - Dual switch forward type, high speed converter operating at 300kHz. Use custom transformer with windings Additional control circuitry with quick response time HEPP Workshop 2019 Nelson Mandela University 5

6 Board Physical description Mechanically Supports and electrically connects electronic components. Printed circuit boards procured and to be populated and assembled by Jemstech. Components are soldered on PCB to both electrically connect and mechanically fasten CAD software for additional design layout of the circuit HEPP Workshop 2019 Nelson Mandela University 6

7 Current Wits test station High Voltage power supply, Low Voltage power supply, Oscilloscope, Electronic load. Four Printed circuit boards with a PCI Express card 2019 HEPP Workshop 2019 Nelson Mandela University 7

8 Continued Test Stand PC ready to use Installed LabView 2018 on the test computer and tested the VI from University of Texas at Arlington. Viewed the BOM files HEPP Workshop 2019 Nelson Mandela University 8

9 Re-drawing of the test stand diagram HEPP Workshop 2019 Nelson Mandela University 9

10 Burn-In Station Production The Burn-In Station performs an endurance type test. Here, a LVPS brick is subjected to a stressed environment where the load and temperature are both elevated. In this environment the expected operational life of the brick is reduced, which serves as an indicator of how long the bricks will last under the normal environment in the detector. This will allow us to identify any components which fail to perform at their maximum rated limits. HEPP Workshop 2019 Nelson Mandela University 10

11 Software Test station set up ꙮThe test station uses a Personal Computer with a software LabView 2018 from National Instruments ꙮCurrently testing the DAQ and familiarizing ourselves with the software HEPP Workshop 2019 Nelson Mandela University 11

12 General system guidelines and goals for the LVPS 1. To improve the radiation hardness of electronics 2. Improved reliability 3. Generally reduce the complexity of system where possible 4. Reduce the number of voltages to be generated HEPP Workshop 2019 Nelson Mandela University 12

13 Future Tasks More expertise on the test station Continue to run the data acquisition on PC LabView software setup to work in conjunction with new test stand Test stand mechanical fixture Michael Hibbard et al, 2008 References: ATLAS collaboration. ATLAS tile calorimeter: Technical design report. CERN-LHCC-96-42, 1996 HEPP Workshop 2019 Nelson Mandela University 13

14 Ke a leboga. HEPP Workshop 2019 Nelson Mandela University 14