Post on 20-Dec-2015
The LHCf experimentMeasurement of Photons and Neutral Pions in the
Very Forward Region of LHC
Letter Of Intent: May 2004Technical report: September 2005Technical Design Report: February 2006
•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
LHCC October 2005 comments:
Experimental Method:Experimental Method:2 independent detectors on both sides of 2 independent detectors on both sides of
IPXIPX
INTERACTION POINT
Beam line
Detector II
Tungsten
Scintillator
Silicon strips
Detector I
Tungsten
Scintillator
Scintillating fibers
140 m 140 m
1. Redundancy2. Background rejection (especially beam-gas)3. Physics single diffractive/double diffractive
Detector #1: transverse Detector #1: transverse projectionprojection
Hamamatsu MA-PMT for scintillating
fibers
PMTs for WLS fibers
4cm
3cm
2cmBEAM AXISBEAM AXIS
Scintillating fibers
WLS fibers to readout plastic
scintillators
130
mm
90 mm
R74
00U
R74
00U
R74
00U
R74
00U
E57
80
E57
80
E57
80
E57
80
Detector #2
4 cm
3 cm
2 cm
6.4 cm
6.4
cm
W +Sci
Silicon
SciFi are replaced by silicon strips 64x64 mm2
Pitch 160 m3 double layers (x-y)1 double layer in front of the calorimeter
Si SiSiSci+W
Si
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)
Few general commentsFew general comments
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’
Operations required on the LHC infrastructures (1)
Shield
Minicrate
Manipulator
Mechanical drawings of interconnections between TAN andmanipulator, minicrates and shielding should be done a.s.a.p.to drill holes before TAN installation in tunnel
• 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 ?
Operations required on the LHC infrastructures (2)
LHCf and LUMI monitor inside TAN
LUMI monitor inside TAN is beyond LHCf (replacing 4th copper bar)
LHCfLumi
Cu Bar / ZDC
IP1
LHCfLumi
Cu Bar / ZDC
LHCf 54 X0 thicknessBeam 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
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
The next steps…