1. The interaction region for FIRST (status report)
(FIRST meeting at GSI, November 25th 2010 )
Eleuterio Spiriti ( INFN Roma Tre )
Vertex and interaction region detectors requirements
The FIRST setup
The Air Box in the FIRST target chamber
Beam entrance/exit window test
Beam monitor status (from A. Paoloni)
Start counter status (from A. Paoloni)
Beam monitor/start counter schedule (from A. Paoloni)
Measured M26 performances on Ions
8. FIRST target and vertex mechanics
9. Vertex cabling and patch panels
10. V1495 FPGA code design
11. JTAG initialization
12. FIRST vertex schedule
Eleuterio Spiriti
FIRST meeting GSI,

2. Vertex (interaction region) detector requirements
Carbon beam spot FWHM = 3mm -> Sensor active size in the range of cm2
Angular acceptance as large as possible (protons emitted at large angle)
Angular resolution on two tracks separation ~ 0.3 deg (therapy requirements)
Carbon interactions in Vertex sensors directly contribute to systematic!!!
Overall sensors thickness ~1% of target thickness (~1cm).
Angular resolution on two track separation ~ 0.3 deg (Therapy requirement).
Carbon interactions in vertex sensors directly contribute to systematic!!!
overall sensor thickness to few % of target thickness (~1cm).
Dynamic range from 2 to 100 m.i.p.
TPC pile-up and Hodo maximum DAQ rate limits the read out rate to few KHz and
needed statistic to be collected to reach for desired measure precision fix the read
out time to be << 1 ms.
Few events superimposed in the Vertex could be disantangled using the beam-monitor position information.
Eleuterio Spiriti
FIRST meeting GSI,

3. The FIRST setup
Based on the large
pre-existing ALADIN
setup
Large angle
hodoscope
ALADIN magnet
MUSIC TPC
TOF wall
Neutron detector
beam
New interaction
region.
Beam monitor
drift chamber
Target
Fragments
Start counter
150 µm thick
M26 vertex
Large angle calorimeter
Beam
Goal: measure Z, A, emission angle and p of all fragments.
Small angle calorimeter
Eleuterio Spiriti
FIRST meeting GSI,

4. FIRST interaction region “air box”
Beam monitor
drift chamber
and
start counter
Vertex
mechanical
structure
Target chamber
at GSI
Beam exit
window
Beam entrance
window
Air box
exploded view
Eleuterio Spiriti
FIRST meeting GSI,

5. FIRST “air box” beam entrance/exit window test
Test done at INFN
Roma Tre mechanical
workshop
Eleuterio Spiriti
FIRST meeting GSI,

6. BEAM MONITOR STATUS (I)
Slide from A. Paoloni (LNF)
Drift chamber (old prototype)
X-Y view : 4 planes per view
Exagonal cell: 0.5 cm radius
Ar-C02 operation
Tested one year ago at LNS 12C beam
with good results.
Eleuterio Spiriti
FIRST meeting GSI,

7. BEAM MONITOR STATUS (II)
New Beam Monitor:
Rectangular Drift Cell (8 mm drift space)
Six planes/view
Less beam interaction with the wires
Less border effect in the space-time relations
Tracking redundancy
Beam
One layer for each view still to be wired
(pins to be ordered)
Slide from A. Paoloni (LNF)
Eleuterio Spiriti
FIRST meeting GSI,

8. START COUNTER STATUS (I)
First Start Counter prototype (100 micron scintillator + fibers read-out) tested at LNS with 12C during 2009: 300 ps resolution, dominated by small amplitude and bad noise rejection.
Second Start Counter (150 micron scintillator + scintillator ribbons read-out) tested at LNS with 12C during 2010: bad light collection, due to light leaks in the bendings of the ribbons .
Slide from A. Paoloni (LNF)
Eleuterio Spiriti
FIRST meeting GSI,

9. START COUNTER STATUS (II)
New Start Counter, 150 micron thick, with radial fibers read-out: ready by the end of February 2011
Support structure
Slide from A. Paoloni (LNF)
Eleuterio Spiriti
FIRST meeting GSI,

10. START COUNTER SCHEDULE
4 PMTs ordered
End of January 2011 → Mechanics (support + ferrules) ready
February 2011 → Fibers gluing
16-20 March 2011 → Test beam validation with Carbon ions and protons at LNS
Before the LNS test beam, tests with Am source or BTF (LNF) with electron bunches ?
BEAM MONITOR SCHEDULE
December 2010 → Cosmic ray test stand to validate Front-end electronics + TDC coupling
February 2011 → Test beam with electrons at BTF (LNF)
February 2011 → Beam monitor completion (wiring of the last layers)
16-20 March 2011 → Test beam with Carbon ions and protons at LNS
Beams:
Test beam BTF (500 MeV electrons)
Test beam LNS (Carbon ions, protons 80 MeVn)
Slide from A. Paoloni (LNF)
Eleuterio Spiriti
FIRST meeting GSI,

11. M26 Proximity Board for FIRST dimensions
Eleuterio Spiriti
FIRST meeting GSI,

12. Test beam setup at INFN LNS Carbon Ion beam collimator.
“zero gradi” hall beam line
Carbon ion at 62 Mev/u
Carbon Ion beam collimator.
(33cm from the sensor)
Trigger counters
M26 sensor
Eleuterio Spiriti
FIRST meeting GSI,

13. Cluster size versus Carbon Ion impinging energy
Ten superimposed runs at: 18MeV/u, 27MeV/u, 33MeV/u, 38MeV/u, 60MeV/u; absorber at 1cm and 33 cm
A different measurements with and without a 0.95mm thick Aluminium target shows an
increase in the background < 10%!
Background with
absorber (PMMA) at 1cm
Background with
absorber ( PMMA ) at 33cm
Eleuterio Spiriti
FIRST meeting GSI,

14. Cluster size versus Carbon Ion released charge/impinging energy
Light blue region is the cluster size measured for
the Am241 alpha ions from ~ 1.4MeV to ~ 5.0MeV.
Charge released in 1 µm of silicon
by different ions at different energies
Eleuterio Spiriti
FIRST meeting GSI,

15. Stepping motor here to remotely control the target scan
M26 vertex detector and target mechanical support
4 different material targets
Stepping motor here to remotely control the target scan
Exploded views
Four TPS_M26_ProximityBoards
Eleuterio Spiriti
FIRST meeting GSI,

16. FIRST target and vertex mechanics
Side B patch panel
Sled movement
stepping motor
Ion beam
Four vertex stations
Side A patch panel
Five sled target housings
Eleuterio Spiriti
FIRST meeting GSI,

17. FIRST vertex patch panel an cabling prototype
Patch panels prototypes
Eleuterio Spiriti
FIRST meeting GSI,

18. FIRST vertex patch panel an cabling prototype
Patch panels prototypes
Eleuterio Spiriti
FIRST meeting GSI,

19. FIRST vertex patch panel an cabling prototype
Patch panels prototypes
Eleuterio Spiriti
FIRST meeting GSI,

20. frames stored for each trigger Trigger mode data format
FIRST vertex detector DAQ status
V1495 VME board FPGA code to readout 4 M26 sensors
4 M26 data deserializer
Three consecutive
frames stored for each trigger
Trigger mode data format
(32 bits words)
HEADER
TRIGGER_COUNTER
TimeStamp
FrameCounter
Word Number in frame
Data
TRAILER
VME JTAG programming ready
Software to be developed!!!!!!!!!
Eleuterio Spiriti
FIRST meeting GSI,

21. FIRST vertex detector DAQ status
(JTAG hardware)
Eleuterio Spiriti
FIRST meeting GSI,

22. FIRST vertex schedule ( VERY OPTIMISTIC!!!! )
Entrance/exit window design: this week?
Entrance/exit window test: December?
Mechanic Air Box design: end January 2011?
Mechanic Air Box costruction: end February 2011?
Target/vertex mechanics: end March 2011?
M26 gluing on 4 stations ( Strasbourg ) this week
M26 bonding on 4 stations ( Strasbourg ) end November 2010
Patch panel PCB design underway December 2010
Patch panel PCB production January 2011
DAQ V1495 ( JTAG? ) end 2010
MBS vertex readout February 2011
Eleuterio Spiriti
FIRST meeting GSI,

23. J.Baudot talk at IEEE-NSS09 conference
Eleuterio Spiriti
FIRST meeting GSI,

24. M26 proximity board with mechanical support
Eleuterio Spiriti
FIRST meeting GSI,