1. f March 4, 2001 BTeV High Voltage David Christian Fermilab

2. March 4, 20012 High Voltage Requirements A draft requirements document exists: http://home.fnal.gov/~dcc/btev/ A workshop has been scheduled for 4/20/01 WH12W in the morning (9:00 – 12:30) FCC2A in the afternoon (1:30 – 5:00) I need to know who will attend by video (FNAL + 3 slots reserved)

3. March 4, 20013 High Voltage Summary Detector Subsystem PolarityMax # of channels (without spares) Voltage Range Current Range Readback Precision PixelsNegative14260-100010 nA – 10 mA 0.1% of full scale V & I SSD’sPositive8700-1000100 nA – 10 mA 0.1% of full scale V & I StrawsPositive3700~0-2200 0 – 10  A 0.5% of full scale V; 1% I RICHNegative Positive 286 143 15kV-22kV 10kV-17kV 0-100 0 – 100 nA 0 – 10  A 0.1% FS V;1% I 0.1% FS V;10% I EM Cal.Negative 230 230-690 0-400 0-600 0-800 0-1000 0 – 10 mA 0 – 2 mA 0 – 0.5 mA 0 – 0.1 mA 0.02% FS V; 0.1% I 0.01% FS V; 0.1% I Muon Chambers Positive2496~0-2000 0 – 12  A 1% FS V & I

4. March 4, 20014 Are these requirements reasonable? Number of channels is very large. Do straws & muon chambers need an HV channel for every group of 32 wires? Does every pixel (SSD) sensor need an individual HV channel? V,I Ranges & Readback specs okay? Please check & send e-mail (to me at dcc@fnal.gov) with suggestions for changes.