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.c;XMM-OM/MSSL/NT/0005.01
.c;^& Notes on a draft specification to EEV for development and manufacture of\&
.c;^&a micro-channel plate intensifier for\&
.c;^&the proposed Optical Monitor on XMM\&
.c;R Cole and J Lapington MSSL 6-Jan-89

.hl 1 Introduction
The requirement is that the microchannel plate, spiral anode intensifier 
currently being developed by EEV for MSSL be further developed for the XMM 
Optical Monitor. This is an ESA mission due to fly in the late 1990s.

The proposed contract to develop the detector for the Optical Monitor is 
quite separate from the contract currently in place to deliver a prototype 
detector in early 89 and does not effect any condition of that contract.

The proposed new contract would start in Sep 1989 assuming that 1) the Optical 
Monitor is selected for XMM (selection due mid 89) and 2) UK funding can be
organised in a timely fashion. 
.hl 1 SPECIFICATION
The specifications on the intensifier are :
.lit

Field diameter				18mm

Input Window				Sapphire window giving useful 
					sensitivity down to 1500A

Photocathode				S20

RQE					>20% at 3000A

Resolution				36 microns 

Number of pixels			1024x1024

Spectral Range				1500-6500Angstroms

Max Overall Count rate			105c/s

Max Point source count rates		
		- without defocussing 	1000c/s	
		- with defocussing 	10000c/s	
					
Mass					TBD

Power					TBDW at TBDV

Lifetime				10 years continuous operations 
					with allowable gain reductions

Vibration specification			TBD

Operational Temperature Range		TBD

Survival Temperature Range		TBD

.eli
The Spiral Anode patterns will be delivered by MSSL. The channelplates will 
be provided by EEV or MSSL.
.hl 1 Development Programme
The development programme for the detectors for the Optical Monitor is 
divided into three sections. The programme for development of the intensifier 
will similarly be divided into three contracts. Each contract will be 
separate and commitment to one will not imply commitment to following 
stages. 

The intensifier development programme is organised as follows. The 
deliverables are listed against each section with approximate dates.

^&PHASE-A\&

Period - Sep 1989 to June 1990

Objectives - To produce an intensifier that shows that the scientific aims of 
the instrument in terms of sensitivity and resolution can be met. Lifetime
will not be proven in this stage and the final design may not be optimal 
in terms of size, mass and power consumption.

This intensifier will form part of the 'Scientific Model' detector. This 
detector will be used for tests, the results to be compared with those from 
the competing detector design.

Deliverables -

- One prototype intensifier (Feb 1990)
.br;- Support of following tests with complete detector (Mar-June 90)

^&PHASE-B\&

Period - July 1990 to Jan 1992

Objectives - 

1.To produce an intensifier of flight design that demonstrates that the full 
scientific and engineering requirements can be met. This unit will not be 
qualification tested but will be used in vacuum.

2. To begin a programme that demonstrates that a 10year lifetime can be 
achieved. This programme may not be completed by the end of the phase. The 
life testing will be carried out by UCL/MSSL with the support of the 
contractor.

3. Begin activities to allow timely delivery of items under phase C/D.

The intensifier under 1. will form part of the 'Electro-optical Breadboard'
(E.O.B.) detector. This will be used as part of the E.O.B. Optical
Monitor that will undergo end to end optical tests in vacuum. 

Deliverables under this phase will be produced according to the XMM-OM 
product assurance plan.

Deliverables -

- One E.O.B. intensifier (Mar 1991)
.br;- Three intensifiers for use in life testing programme (mid 1991)
.br;- Support of following tests with complete detector



^&PHASE-C/D\&

Period - Feb 1992 to Dec 1995

Objectives - 

1. To produce intensifiers of flight design for qualification programme. 
Qualification level environmental testing (vibration/thermal vacuum) will be
carried out by UCL/MSSL but intensifiers will only be accepted when testing
is completed successfully. 

2. To produce flight and flight spare intensifiers. Acceptance level 
environmental testing will be carried out by UCL/MSSL but intensifiers will
only be accepted when testing is completed successfully. 

3. Complete programme of life testing.

Deliverables under this phase will be produced according to the XMM-OM 
product assurance plan.


Deliverables -

- Two qualification model intensifiers with supporting documentation (Oct 
1992)
.br;- Four flight and flight spare intensifiers with supporting documentation 
(spread over Apr 1994-Oct 1994)
.br;- Support of following tests with complete detector (Oct 1994-Dec 1995)