Status of VPT Delivery and Testing

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Presentation transcript:

Status of VPT Delivery and Testing R M Brown, P R Hobson, B W Kennedy CMS Week March2005 B W Kennedy, R M Brown - RAL 1

VPT Delivery and Test –1 Mar 05 CMS Week March2005 B W Kennedy, R M Brown - RAL 2

Examples of Typical and Noisy VPTs  ~ 4 counts VPT 790 Initial spike CMS Week March2005 B W Kennedy, R M Brown - RAL 3

Noisy VPTs vs Barcode(Dec03) CMS Week March2005 B W Kennedy, R M Brown - RAL 4

Noisy VPTs vs Production No. (6.5+/-0.8)% (3.2+/-0.5)% (6.9+/-0.8)% CMS Week March2005 B W Kennedy, R M Brown - RAL 5

Noisy VPTs vs Prod_No(Nov04) CMS Week March2005 B W Kennedy, R M Brown - RAL 6

Noisy VPTs vs Prod_No(Mar05) CMS Week March2005 B W Kennedy, R M Brown - RAL 7

Off-axis electrodes vs Production No (Mar05) CMS Week March2005 B W Kennedy, R M Brown - RAL 8

Summary VPT Delivery is proceeding according to a revised schedule (400/month from Oct 04 - completion February 06). Full testing at 1.8T and batch testing (10%) at 4T are keeping pace with delivery. RIE claim to have identified a correlation between anomalous behaviour and process control measurements. Fraction of anomalous tubes has dropped significantly in recent deliveries (~6.0 ± 0.3%  ~3.0 ± 0.5%). Fraction of tubes with visibly mis-aligned electrodes has also improved significantly for recent deliveries. CMS Week March2005 B W Kennedy, R M Brown - RAL 9