Transcript PowerPoint プレゼンテーション

The LHCf experiment
Measurement of Photons and Neutral Pions in the
Very Forward Region of LHC
Letter Of Intent: May 2004
Technical report: September 2005
Technical Design Report: February 2006
LHCC October 2005 comments:
•The physics goals are worthwhile and the proposed experiment appears suited to achieve them
•A few key issues require immediate consideration, and documentation in the update of the TP:
•establish official contact with the relevant structures in the AT/AB departments,
as well as in ATLAS and formulate a complete and costed installation and operation
plan, with a commonly agreed checklist, milestones and timeline
•appoint a technical coordinator (possibly located at CERN?)
•consider and document safety issues
Experimental Method:
2 independent detectors on both sides of IPX
Detector I
Tungsten
Scintillator
Scintillating fibers
Detector II
Tungsten
Scintillator
Silicon mstrips
INTERACTION POINT
140 m
140 m
Beam line
1. Redundancy
2. Background rejection (especially beam-gas)
3. Physics single diffractive/double diffractive
Y Chamber
Detector location
E5780
E5780
E5780
E5780
R7400U
R7400U
R7400U
Scintillating fibers
R7400U
Detector #1: transverse projection
PMTs for WLS
fibers
WLS fibers to
readout plastic
scintillators
130 mm
4cm
3cm
BEAM AXIS
Hamamatsu MA-PMT
for scintillating
fibers
2cm
90 mm
Detector #2
Silicon
W+
Sci
4 cm
6.4 cm
6.4 cm
3 cm 2
cm
Si
Si
Si Si
SciFi are replaced by silicon mstrips
64x64 mm2
Pitch 160 mm
3 double layers (x-y)
1 double layer in front of the calorimeter
LHCf: replace first 3 copper bars
The TAN for the luminosity monitor
Photos taken
On April 25th, 2005
At CERN
Few general comments
Choice of the Interaction Region
• IP8 (LHCB) or IP1 (ATLAS) were identified in 2004
• IP1 was definitely chosen by LHCC in October 2005
• Detectors on both sides symmetrically wrt interaction point
• LHCf will be installed before the LHC startup (May 2007)
• ‘Ideal’ running conditions:
•43 Bunches
•Low luminosity (~1030 cm-2s-1)
• ≤ 1 year data taking period
• Detectors will be moved up and down by remote control
(during beam setting operations)
Operations required on the LHC infrastructures (1)
Modifications of the TANs (before February 2006?) to:
• install manipulator remotely controlled
• install minicrates for the electronics
• install additional shielding on top of the TAN to
protect the detectors in ‘parking position’
Manipulator
Mechanical drawings of interconnections between TAN and
manipulator, minicrates and shielding should be done a.s.a.p.
to drill holes before TAN installation in tunnel
Operations required on the LHC infrastructures (2)
• Modifications of the TANs (before February 2006) to:
• install manipulator
• install minicrate for the electronics
• install additional shielding on top of the TAN to protect the
detectors in ‘parking position’
• Cables (to be pulled before February 2006?):
• Power lines
• DAQ lines (optical fibers)
• Analog signals for trigger
• Slow controls
• Cables for manipulator
•Water cooling for the electronics
•220 V ?
LHCf and LUMI monitor inside TAN
LUMI monitor inside TAN is beyond LHCf (replacing 4th copper bar)
IP1
Cu Bar / ZDC
LHCf
Lumi
LHCf Cu Bar / ZDC
Lumi
LHCf  54 X0 thickness
Beam Pipe is shaped to have a projected thickness of 1 X0 on 10 x 10 cm2 region
LUMI Monitor see different thickness of material depending on the LHCf position
(one of the LHCC concerns!!!!)
We are studying the problem of the LUMI calibration together with W.C. Turner
and his group from LBNL
The next steps…
Technical coordinator at CERN starting from December 2005
• Strict contact with TS/LEA and LEMIC
• Strict contact with Atlas experiment
• Electronics crates in USA15
• Cables in the Atlas zone
• Trigger
Demande Installation Cables (DIC) in preparation
Engineer Change Request (ECR) in preparation for all the
TAN and LHC related activities