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

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

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

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

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

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

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

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

9. 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 March B W Kennedy, R M Brown - RAL