AMENDMENT N 2

to Technical Specification of VPT to be supplied for

Purchase Order N B-3137-25501-20
St. Petersburg	26 April 2002

Party A:	ETH Zurich, Institut für Telichen physik, Labor für Hochenenergiephysik, Zurich, Switzerland

Party B:	Open Joint Stock Company "National Research Institute "Electron", St. Petersburg, Russia

Both Parties having considered the proposals for modification of the Specification on VPT of 1.05.2001, to be delivered under above mentioned Purchase Order, came to the following decisions:

1.	To change the last phrase of the Chapter “Current Gain in Zero Field, G” as follows:
“The measurements shall be made with a photocurrent between 5 and 30 nA and gain shall be 7,0 at normal operating voltage”.

2.	To change the first phrase of the Chapter “Electrical Connections” as follows:
“Electrical connections will be 1l0+0-15 mm in length, made of copper flexible wires (PVMP-2 type),” ... further according to the text.

3.	To change the first phrase of the second indention of the Chapter “Electrical Connections” as follows:
“The VPT's base (socle) will comprise a cylinder of not less than 14 mm in length” ... further according to the text.

4.	To change the third indention of the chapter “Construction” as follows: External diameter -26,7+0-0.7, mm.

This amendment is valid for deliveries to be made after 27 April 2002.

On behalf of PartyA	On behalf of Party B

_______________	H Rykaczewski	_______________	I.Vasilyev

Protocol of the meeting
between Research Institute Electron (RIE) and CMS ECAL Delegation

	St. Petersburg	26 April 2002

Based on the test results of VPTs presented by D. Cockerill both Parties agree:
RIE is in the process of improving production techniques with the intention to eliminate effects observed by CMS at the visual inspection.  In particular, it is expected that VPTs delivered alter May 2002 will:

1.	not have a “missing” photocathode surface exceeding an estimated value of about
10%,

2.	have minimized misalignment of the anode grid,

3.	show no red/brown discolouration of photocathodes.

Both Parties agree to monitor the effects listed above and shall revisit the test results of future deliveries.
RIE made a proposal on the details of crimping the pins to the wire.  CMS (T. Lodge) will examine this proposal and perform some tests.  CMS will reply to the proposal of RIE as soon as possible.

	From CMS ECAL	From

______________	H. Rykaczewski	_____________	I Vasilyev