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UCSB CMS Weekly Status Meeting CMS Tracker Rod Filters Sam Burke EE Slide 1
Rod Power Line Low-Pass Filter Study
3 August 2004
Sam Burke
UCSB HEP Group
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UCSB CMS Weekly Status Meeting CMS Tracker Rod Filters Sam Burke EE Slide 2
Progress
• Noise on CERN Rod Test System Power line is source per battery tests 2.5 mV @ 1Mhz measured on Rod PS @UCSB
• Low Noise on UCSB Rod System 1 - 2 A/D Counts
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UCSB CMS Weekly Status Meeting CMS Tracker Rod Filters Sam Burke EE Slide 3
Progress• Inject Noise into UCSB system
introduce noise pulse train into 0.1 ohm resistor placed at common power supply point and observe system response.
Fixture currently being prepared for test
• Reduce self-induced noise with filtering Place Low Pass Filter on power line Shaper Noise Band Defined
– 1/260ns =4Mhz to 1/40ns =25Mhz
– >60dB attenuation in shaper band
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UCSB CMS Weekly Status Meeting CMS Tracker Rod Filters Sam Burke EE Slide 4
Low Pass Filter Schematic
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UCSB CMS Weekly Status Meeting CMS Tracker Rod Filters Sam Burke EE Slide 5
LP Filter Response
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UCSB CMS Weekly Status Meeting CMS Tracker Rod Filters Sam Burke EE Slide 6
LP Filter Test Results
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UCSB CMS Weekly Status Meeting CMS Tracker Rod Filters Sam Burke EE Slide 7
LP Filter
• Break 2 power lines and common line and insert filter.
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UCSB CMS Weekly Status Meeting CMS Tracker Rod Filters Sam Burke EE Slide 8
Open Filter Issues• Voltage drop
Vgnd=IR=19A*4.9mohms=93mV on Gnd V+2.5=IR=12A*4.9mohms=60mV on 2.5V line
• Heat Generation I^2R=19^2*.0049ohms=1.7 watts on Gnd coil I^2R=12^2*.0049=0.7 watts on 2.5V line coil I^2R=7^2*.0049=0.24 watts on 1.25V line coil
• Core Saturation in Machines Magnetic Field Open core may saturate in field Investigate toriod candidate
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UCSB CMS Weekly Status Meeting CMS Tracker Rod Filters Sam Burke EE Slide 9
Alternate Filter Approach
• Move filter outside of CMS magnetic enviornment No saturation of filter inductors Need to insert (splice) filter into Rod Power Cables
• Reduce heat generation by filter I^2 heating Use lower winding resistance with a reduced noise
attenuation if acceptable
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UCSB CMS Weekly Status Meeting CMS Tracker Rod Filters Sam Burke EE Slide 10
Alternate Inductor Impact
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UCSB CMS Weekly Status Meeting CMS Tracker Rod Filters Sam Burke EE Slide 11
Rod LP Filter Prototype• High Current
Inductors are on the two DC Power lines.
• Twisted pairs are power sense lines and analog sensor lines
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UCSB CMS Weekly Status Meeting CMS Tracker Rod Filters Sam Burke EE Slide 12
LP Filter At Rod Pwr Line
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UCSB CMS Weekly Status Meeting CMS Tracker Rod Filters Sam Burke EE Slide 13
Pulse Transformer
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UCSB CMS Weekly Status Meeting CMS Tracker Rod Filters Sam Burke EE Slide 14
Rod Module 1
• Top: Noise injection of 10 ns pulse, 30 mhz, 10vpk
• Bottom: Low Pass Filter in Power Circuit
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UCSB CMS Weekly Status Meeting CMS Tracker Rod Filters Sam Burke EE Slide 15
Rod Module 3 (under CCU)
• Top: Noise injection of 10 ns pulse, 30 mhz, 10vpk
• Bottom: Low Pass Filter in Power Circuit
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UCSB CMS Weekly Status Meeting CMS Tracker Rod Filters Sam Burke EE Slide 16
Rod Module 6
• Top: Noise injection of 10 ns pulse, 30 mhz, 10vpk
• Bottom: Low Pass Filter in Power Circuit
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UCSB CMS Weekly Status Meeting CMS Tracker Rod Filters Sam Burke EE Slide 17
Future Plans