1. HBD HV Control and Monitoring System RESISTORS, CALIBRATION & CO. Manuel Proissl HBD Meeting 12/23/2008

2. OUTLINE  Project: dV = 0 Step 1: Calibration of LeCroy PS Step 2: Resistors on Divider Step 3: Mesh Voltage Sweep vs. ADC Readout  Project Progress Calibration Routine / Curves  Calibration Program in HV Control  Divider(s) Resistor Measurements on HBD  Cable Coding (…)  Coming Up Upgrades For Run9 | PHENIX, BNL HBD HV Control System HBD Meeting :: December 23 rd, 2008 HBD HV Control & Monitoring System Manuel Proissl Page 2 of 6

3. PROJECT: dV = 0  Step 1: In order to accomplish the project’s goal, the fundamental prerequisite is knowing the ACTUAL voltage we’re applying… Issue:Difference between DV, MV (mainframe) & actual voltage supplied Solution:Calibration Curves for all channels  Step 2: What voltage ends up being supplied to the GEM/Mesh? Issue:Resistor values only known by color code (…) Solution:Measurement of all resistors installed on divider board  Step 3: What is going to be The Mesh Voltage for RB?  Issue:Who knows?  Solution:1+1 Mesh Voltage Sweep during +/- config and ADC readout files for every sweep voltage  analysis  peak of PE vs. Mesh V. HBD HV Control & Monitoring System Manuel Proissl Page 3 of 6 Upgrades For Run9 | PHENIX, BNL HBD HV Control System HBD Meeting :: December 23 rd, 2008

4. PROJECT PROGRESS  Under IR Access > MF Calibration, HV Control runs a calibration procedure automatically for every channel, while the Fluke via divider records every second (FlukeView) the output voltage of the particular channel on the LeCroy  After initial non-linearity problems (unknown current development), further calibration work will be done (…)  ALL resistors have been measured with Fluke in nS through FlukeView with 20 stable events each for average calculation These will be out shortly… available in the hvdb database  ALL take-out resistors have been labeled with an unique position code From now on, any future changes can be done safely without any mix-up! HBD HV Control & Monitoring System Manuel Proissl Page 4 of 6 Upgrades For Run9 | PHENIX, BNL HBD HV Control System HBD Meeting :: December 23 rd, 2008

5. THE RESISTOR CODEC HBD HV Control & Monitoring System Manuel Proissl Page 5 of 6 EW View from IR Front ES3 ES4 ES5 EN3EN5 EN4 WS3 WS4 WS5 WN3WN5 WN4 ES1 ES2 EN2 EN1 WS1 WS2 WN2 WN1 SNSN 13 2 57 468 Resistor ID Code HV Box (1-8) Module Num. (1-5) GEM (T, M, B) Layer (1-3) Upgrades For Run9 | PHENIX, BNL HBD HV Control System HBD Meeting :: December 23 rd, 2008

6. COMING UP  Resistor Values into hvdb database Connecting to config system in HV Control HV remote testing until Jan 2 nd  Correction Curves for 1471N Calibration: new divider setup…  Distribution / Installation Files for Linux & XP/Vista Platform independence Final installation files with Installation Wizard  HV remote testing / system improvements until Jan 2 nd HAPPY HOLIDAYS!!! HBD HV Control & Monitoring System Manuel Proissl Page 6 of 6 Upgrades For Run9 | PHENIX, BNL HBD HV Control System HBD Meeting :: December 23 rd, 2008