1. Next steps toward the beam test
M. Deveaux

2. Another speaker: P. Staszel
P. Staszel, 9th October 2012
Idea: Complement NA61/SHINE with a vertex detector

3. The NA61 beam telescope MIMOSA-26AHR 1152x576 pixels of 18.4x18.4µm²
3.5 µm resolution, 0.05% X0
Readout time: µs
Proposed text:
The SAVD will be located in a helium box close to the target of the NA61 experiment. It consists of two spectrumeter arms with 4 stations each. The stations are located 5, 10, 15 and 20 cm from the target. The total surface of the device is 32 cm², which is considered as a good compromise between good detection efficiency and low technological complexity.
-> Animate
The SAVD will rely on the MIMOSA-26AHR sensors, which are known from the EUDet telescope and quite similar to the sensors, which are successfully operated in the STAR-HFT. The sensors have … pixels with …. pitch turning into a 3.5µm spatial resolution. Moreover, they are routinely thinned to 50µm and their readout time is µs.
The sensors will be installed on actively cooled carbon fibre adders, which are being produced for the ALICE ITS. It is expected that the stations will obtain a total material budget of <0.4% radiation length, cables and sensors included.
Info for the speaker: ALICE is a little better, we have added a layer of carbon fibre, which is to match the ladder to the size of the sensor and to ease the integration of the sensors.
Fundamentals:
4 5;10;15;20 cm
Located in a helium box.
Total surface: 32 cm²
Ladders: ALICE ITS (upgrade)
Liquid cooled
Material budget (all included): < 0.4% X0

4. Working packages (according to Pb-Addon)OK OK

5. Integration of the ladders
Sensor Flex Cable Missing
Glue
Glue
1 working week
Carbon fibre plates
2 working weeks
Bonding
Unknown
Glue
Holding tools for ladder Missing
Transport
to Krakow
2 days
Transport tools
Missing

6. Open items – Flex cable Sensor Flex Cable Missing Must be low material
Must be fine pitch
=> Non standard device
Offers (prices without VAT (?)):
ILFA
Good experiences in the past
Equipped and experienced for the task
High cost (1865€), long delivery time working days
Multi-CB
Bad experiences in the past (specs repeatedly not met for Mi26 boards)
Reduced cost, faster delivery (1000€), 9-15 working days
Purchase of sensor flex => critical path of the project
Personal proposal: Go ILFA (only one shot)

7. Integration of the ladders
Sensor Flex Cable Missing
Glue
Glue
2 months?
1 working week
Carbon fibre plates
2 working weeks
Bonding
Unknown
Glue
Holding tools for ladder Missing
Transport
to Krakow
2 days
Transport tools
Missing

8. Open items – Holding and transport tools
Holding tool for placing the CF plates on ladders:
Responsability not obvious
Not available or designed so far
Situation at IKF
Currently few manpower for mechanical design (lost know how)
Slow response of mechanical workshop (min. 6 weeks)
Few knowledge on what is reasonable
Support from CERN (Gregory needed)
Design/construction at CERN possible?
Same argument holds for transport tools.
Design and construction needs to be started, soon.

9. Integration of the ladders
Sensor Flex Cable Missing
Glue
Glue
2 months?
1 working week
Carbon fibre plates
2 working weeks
Bonding
Unknown
Glue
Holding tools for ladder Missing
Transport
to Krakow
2 days
Test – 7 days
Transport tools
Missing
Time estimate:
~ 1st June

10. Additional issues Status of the FPGA code of the TRB3 boards
Code has been successfully used during a beam time
BUT:
Code is not considered robust for physics
Trigger handling => OK. Trigger number handling=?
Sensors operated synchronous, loss of synchronization detection=?
Buffer overflow handling was found buggy after review.
Issues should be addressed before next beam time.
Possible help:
Q. Li (PhD on FPGA data analysis of MIMOSA-26)

11. Electronic components
Item
Cost (without VAT)
Delivery time
Manufacturer
8x TRB3 Addon
720
2 Months
GSI
12 x CB
3.5 k€
1 Month
Visatronic (cheapest)
12 x FEB
>350 €
To be discussed
25 x FPC FEB-CB ?
Maybe available
Later delivery is acceptable…
but production has to start ASAP in any case.

12. Working packages (according to Pb-Addon)OK
Quite some issues with 3 working packages.
18 other major working packages open.
Do we have a project plan, ressources and manpower?