SCIPP Current Seminars

Experimental archive:

Fall 2009

Spring 2009

Winter 2009

Fall 2008

Summer 2008

Winter 2008

Fall 2007

Summer 2007

Spring 2007

Winter 2007

Fall 2006

Spring/Summer 2006

Winter 2006

Earlier talks

Theory archive

 

SCIPP HOME

The Santa Cruz Institute for Particle Physics (SCIPP) hosts several international conferences, seminars, and workshops. Seminars are held weekly during the academic year. **A Seminar in bold indicates the next Seminar**

WINTER QUARTER 2010

Last updated:02/08/10

 
PLEASE NOTE SPECIAL SEMINAR DAY & TIME:
Friday, February 19, 10:30am
Location: ISB 310
Satish K Dhawan, Yale University
Title: " How to Deliver Very large Amounts of Low voltage Current to HEP Detectors in High Radiation and Magnetic Fields?"

Abstract:

When the current generations of detectors were planned, there was no consideration given to DC power distribution to the FE electronics. LHC detectors use linear regulators with power supplies located in a safe environment at distances of 140 m for ATLAS and 30 m for CMS. A 30% power delivery efficiency was deemed acceptable. For the next generation of detectors being designed now with 0.13 µm lithography for the FE Electronics, the operating voltage is 1.2 V and currents of 25,000 Amps, even higher due to finer segmentation. This results in delivery efficiency of 10%.

We are working on delivering power at x10 higher voltage and propose to use DC-DC converters on the same PCB as the FE ASIC chips. These have to operate in radiation of up to 100 Mrads, magnetic fields of 5T and produce very low noise.

We explore commercial (COTS) technology for DC-DC converter ICs suitable for use with air core inductors. The latter requirement is unique to HEP because of the high magnetic field.