Proposed%20Data%20Acquisition%20System%20for%20N-XYTER

1
CBM-XYTER
specialities and possibilities in high intensity
proton-beam
G. Vesztergombi
CBM Collaboration Meeting Dresden, 27 Sept.
2007
2
OUTLINE
Introduction an invitation for
brainstorming Proton beam at CBM FAIR Total
cross-section trigger at SPS CERN Tagged
neutrino beam for LHC Conclusions
3
DETNI-A 157Gd/Si Detector Module

• Goals
• 108 n/sec in 100 cm2
• with 2 views, 2 hit/strip400 MHz strip hit rate
• with 5 Byte/hit2 GByte/sec data
• Consequences
• 128 channel ASIC
• 20 chip/module
• 20 MHz/chip
• 100 MByte/chip

100 mm
slide courtesy C.J.Schmidt
4
N-XYTER Block Schematic
5
CBM-XYTER at FAIR Time structure difference
between p and A beams High PT selection
6
AA collision ltNtrackgt 3000 ltDtgt 1000
ns
pp collision ltNtrackgt 3 ltDtgt
1 ns
pp
AA
x
x
x
x
Identical occupancy in AA and pp per
microsec but 1000 times less in pp in
nanosec window
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
or
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
Strip readout
Pixel readout required
7
High transverse momentum means high 3-momentum
Illustration for mid-rapidity at sqrt(s) 7 and
14 GeV
( )
( )
( )
E
g gb 0
Lab
p

long
gb g 0
0
0 0 1

• 3.5 1.5
  5.25
• 2.0
  7.0
• 3.0
  10.5

• 90 6.6 1.5
  9.9
• 2.0
  13.2
• 3.0
  19.8

8
(No Transcript)
9
No need for pixel detector for pp, pA high PT
Less than 3 hits per cell (x,y) and (u,v) gives
unique solution Question radiation
hardness Assuming 1011 proton/s beam and 1
target interaction one gets in average 1
event/nanosec. Using 3ns time-window one can
on-flight identify high PT (i.e. high momentum)
tracks Event-building select all hits which are
compatible in time with the triggering 3ns
window. Of course, one assumes that all
particles are running with c and the
Time-of-Flight correction for each channel is
applied.
10
pp, pA physics
Search for jet-quenching at SPS energies
Quark Matter, Shanghai 2006
11
Total cross-section trigger
Idea (without XYTER) was proposed in 1st
FutureDAQ workshop in Munich 25-26.03.2004.
12
(No Transcript)
13
TRIGGER
First level ANTI ( BEAMNEARFAR)
ACCEPT No continuation for BEAM particle in
NEAR module or multiple track
in NEAR
CORRECTIONS elastic scattering
with FAR NEAR inefficiency
interaction in NEAR
14
Prototyping possibilities in SHINE/NA61 at SPS

• Moderate beam intensity lt 107 p/s during the
  spill
• For identification of beam particles one needs
  only
• XYTER cell of 55 cm2 surface with x and y
  readout
• The number of strips depends on the requested
  resolution
• pitch100 m in 5 cm requires 4 chips for x and
  y, respectively,
• if one uses the DETNI 128 channel ASIC chip.
• In total 8 times 8 64 ASIC chips would be
  required.
• Test can be done in autumn 2008 or 2009.

If sensors and xyter ASIC chips would be
available, KFKI-RMKI could design and produce the
interface.
15
Proposal for UNK, Serpukhov
16
LHC tagged neutrino possibility
Slow beam-dump Total fill about 1015 proton ,
extraction time 3 hours 1011 proton/s Secondari
es with few hundred GeV 1012 p/s decay
probability 10-3 Number of decay muons at
tagging station 109 m/s Ideal rate for
XYTER Assumption point-like proton beam
target , i.e. interaction point is known with
reasonable accuracy. Much less load (faster
extraction) for neutral K beam.
17
Unknowns decay point ZD and momenta
Pp,Pm,Pn
Shielding
Decay zone
Z
XYTER-wall
18
Unknowns are only the momenta PK,Pp,Pm,Pn
Decay zone
Shielding
MAGNET
XYTER-wall
Possible e,m identification
19
Expected UNK-Serpukhov rates
Expected LHC
rates Neutrino energies upto TeV ?
cross-section increase High tagging efficiecy
Large detector ? 10-100 ev/s
20
Conclusions
One can propose very interesting unique
applications for XYTER -in short timescale
SHINE total cross-section trigger -in medium
CBM proton physics -in long-range LHC
tagged neutrino from beam-dump
21
(No Transcript)
22
Understanding Data Acquisition System for N-XYTER
www.gsi.de/documents/DOC-2007-Aug-28-2.ppt