1. TOF Low Voltage and High Voltage Systems Vahe Ghazikhanian UCLA Department of Physics and Astronomy
V. Ghazikhanian
July 21, 2005

2. Basic Low Voltage Power Requirement of TOF FEEs.
Maximum tray.
Low Noise:
Periodic and Random Distortion (PARD) < few mVRMS
Floating outputs.
Shielded power cables (optional).
Independent supplies/tray.
Regulation: Not critical (linear regulation on FEE cards).
Remotely controlled and monitored.
Safety: Interlocked and adhere to STAR/BNL safety.
Rack mounted
Relatively low cost.
Good efficiency (not critical).
V. Ghazikhanian
July 21, 2005

3. Comparison of Power Supply choices for TOF FEE.
V. Ghazikhanian
July 21, 2005

4. Linear Regulated power supply with remote sensing scheme for TOF LV system.
V. Ghazikhanian
July 21, 2005

5. V. Ghazikhanian
July 21, 2005

6. David L. Huffman
FNAL Eng. Note
August 16, 2002
Doc # H020816A
Testing for use in MINOS
V. Ghazikhanian
July 21, 2005

7. (March 2005 Cu-Cu on-line data)
Comparison of MRPC Noise Rates Between Wiener and Kepco Linear supplies
(March 2005 Cu-Cu on-line data)
V. Ghazikhanian
July 21, 2005

8. TOF System Resolution from Off-Line Analaysis
Kepco Linear (red curve) vs. Wiener (blue curve)
(March 2005 Cu-Cu)
V. Ghazikhanian
July 21, 2005

9. Arrangement of Supplies in Half Height Racks.
Linear Regulated Supplies
Total of 30 racks required
Ferroresonant power supply
Total of 8 racks required
Wiener power supply
Total of 3 racks required
V. Ghazikhanian
July 21, 2005

10. Low Voltage System Project Schedule.
V. Ghazikhanian
July 21, 2005

11. Kepco Ferroresonant series specs.
V. Ghazikhanian
July 21, 2005

12. Slow Control for the TOF LV system.
Hardware: microcontroller based similar to EMC HV system. Output voltages, currents and temperature for each supply are monitored.
Software: LabView based GUI.
V. Ghazikhanian
July 21, 2005

13. A Sample of LabView Graphical User Interface Control Screen Based on Custom RS485 master/slave Protocol Developed at UCLA.
V. Ghazikhanian
July 21, 2005

14. Updated LabView Graphical User Interface (from EMC HV).
V. Ghazikhanian
July 21, 2005

15. TOF High Voltage System Requirements.
High Voltage to provide symmetric HV up to +/- 7.5 few uA/tray (this current takes into account Beam on condition scaled to RHIC upgrade luminosities).
Remote programability/monitoring: Voltage, current limits, ramping rates, voltage and current monitoring (10 nA resolution).
Isolation: power supply outputs must be floating. Furthermore, since one set of plus and minus outputs supply current for up to 10 trays tray inputs are isolated from other trauys to avoid interference.
HV will be interfaced to STAR interlock system.
Remote control software will be based on LabView and will be interfaced to STAR controls (logging and alarms).
V. Ghazikhanian
July 21, 2005

16. Choice of HV Power Supply.
CAEN SY127 mainframe with A631 pods has been used to supply HV to MRPCs (some problems have been encountered during last two runs - failed A631 modules).
Each SY127 accommodates 10 A631 pods. Each A631 pod (negative and positive output versions available) supplies 4 independent floating channels. Each output could supply up to 8 KV at 100 uA. (One fully equipped SY127 would serve the entire TOF system if we use fanout distribution boxes)
Distribution boxes located on the magnet will fan out each pair of + and – HV to up to 10 trays. These boxes will supply required isolation, filtering and grounding of the HV.
Raynolds/Teledyne 22 KV cables will be used for HV distribution.
Kings 1065 series 10 KV (DC tested to 25 KV) will be used to interface the HV to power supplies, distribution boxes, and the trays.
Remote control and monitoring of the SY127 will be done through CAENET (PC based A1303 PCI-HS CAENET controller already used to control HV system in the past few years).
V. Ghazikhanian
July 21, 2005

17. TOF High Voltage Distribution System
V. Ghazikhanian
July 21, 2005

18. LabView GUI for SMD TCP/IP-based HV Control Program for CAEN SY1527 Mainframe Developed by UCLA.
V. Ghazikhanian
July 21, 2005