Component and Readout chip list for Phobos

Component and Readout chip list for Phobos

(H. Pernegger 9/26/97)

1.) The summary is based on the following choice of chips

Octagon and Spectrometer Type 1 Modules : 128 channel VA HDR1 chip (t=1ms)
InVertex+OutVertex+Rings+ Spectrometer except Module 1 : 64 channel VA HDR4 (t=2ms)

2.) The appended tables summarize the components for 2 configurations:

Full octagon+vertex+rings + 2 spectrometer arms
Full octagon+vertex+rings + 1 spectrometer arm

3.) Spare modules:

The numbers for chips necessary for Vertex, Multiplicity and Octagon spare modules are based on Russel Betts estimate.

For the spectrometer Module 1:

1 spare module for Module Type 1 is assumed.

For the rest of the spectrometer:

Due to the large diversity of modules it seems preferable to have rather spare hybrids than fully assembled spare modules. The spare hybrids can be used to assemble the needed module at the time when it is needed. In the rest of the spectrometer I assume the following number of spares:

Hybrid type	Number of spares
MS3L	3
MS4L	3
MS3R	2
MS4R	2

4.) Prototypes:

The following number of prototype modules and chips on prototypes are assumed

Module Type	Number of Modules	Number of chips
Octagon	5	5 HDR1
IV	1	16 HDR4
OV	1	16 HDR4
Ring	1 sector	8 HDR4
Spect Module 1	1	24 HDR1
Spect Module 4-T5	2	32 HDR4

5.) Assembly Losses and "poor quality" chips

The losses of chips in the assembly process is estimated to be 10% . Additional 10% of the chips as received from IDE may be of poor quality so that we do not want to use them. The summary of chips is given for 10% losses and for 10% losses+10%poor quality. The number to be used finally depends on the level of testing at IDE and our confidence in their tests.

6.) Summary of chips needed

Scenario	128 channel HDR1	64 channel HDR4
2 arms + 10% loss + spare and prototypes	386	1957
2 arms + 10% loss + 10% poor quality + spare and prototypes	419	2128
1 arm + 10% loss + spare and prototypes	280	1205
1 arm + 10% loss + 10% poor quality + spare and prototypes	303	1307

7.) Open questions for our discussions with IDE:

Is this the hardware configuration we want? (Or do we want e.g. smaller pads on the rings,i.e HDR1 instead of HDR4, …..)
Which scenario are we discussing with IDE next week?
What is the maximum price we can pay per chip in the chosen scenario (next week)
Which delivery schedule do we aim for and what id the "worst case" delivery schedule
Which level of testing do we assume ( a.) standard AMS test b.) AMS test + cal-shift register without analog test, c.) AMS test + full analog test )

8.) Chip List for each detector part

The following list estimates the number of chips for scenario 2 (two arms + 20% loss and reject chips) and scenario 4 (one arm + 20% reject chips)

2 spectrometer arms + full multiplicity and vertex

		loss =	0.2
HDR1						419
	installed	spare hybrid	loss/reject	prototype	total
Octagon	92	16	22	5	135
IV			0		0
OV			0		0
Rings			0		0
			0		0
Module 1	192	24	44	24	284
other Mod			0		0

HDR4						2128
	installed	spare hybrid	assembly loss	prototype	total
Octagon			0		0
IV	48	24	15	16	103
OV	48	24	15	16	103
Rings	48	12	12	8	80
			0		0
Module 1			0		0
other Mod	1368	140	302	32	1842

1 arm + full multiplicity and vertex

		loss =	0.2
HDR1						303
	installed	spare hybrid	assembly loss	prototype	total
Octagon	92	16	22	5	135
IV			0		0
OV			0		0
Rings			0		0
			0		0
Module 1	96	24	24	24	168
other Mod			0		0

HDR4						1307
	installed	spare hybrid	assembly loss	prototype	total
Octagon			0		0
IV	48	24	15	16	103
OV	48	24	15	16	103
Rings	48	12	12	8	80
			0		0
Module 1			0		0
other Mod	684	140	165	32	1021