1. CASTOR at CMS Enhancing Forward Physics
Diffractive & Forward Physics Workshop Antwerp 25-26/10, 2007
Apostolos D. Panagiotou
University of Athens

2. Unprecedented coverage at hadron colliders !
CMS Coverage in pT - 
CMS fwd calorimetry up to ||  5 + Castor + ZDC
figure adapted from Risto Orava (Diffraction 2006)
CMS
pTmax~s exp(-η)
1000
100 HF HF
pT (GeV) 10
CASTOR
CASTOR 1
ZDC
ZDC
0.1 T2 T1 T1 T2 RP
-12
-10 -8 -6 -4 -2 +2 +4 +6 +8
+10
+12 h
Unprecedented coverage at hadron colliders !

3. Physics with CMS Forward Calorimeters
Hadronic Forward (HF)
CASTOR IP
ZDC
Low-x dynamics:
Parton saturation, BFKL/CCFM dynamics, proton structure, multi-parton scattering
Diffraction
Measurements for cosmic ray data analysis:
Forward energy and particle flows, minimum bias event structure
Two-photon interactions and peripheral collisions
QED processes to determine luminosity to O(1%), via pp  pp ee and pp  pp 
Forward physics in pA and AA collisions
New forward physics phenomena:
Disoriented Chiral Condensates, incoherent pion emission, Centauros, Strangelets….

4. New Institutes are Welcome !
Recent Developments
CASTOR approved by CMS-MB as CMS baseline detector on
One calorimeter will be built by end of (224 channels)
FEA calculations completed
Prototype construction & assembly study completed
Skeleton construction studies completed
Full length octant prototype constructed and beam-tested in August, 2007
EDR to be completed by end of October 2007
CASTOR sim-digi software in HCAL CMSSW-1_7 release
10. Resources approaching required level for completion. Missing ~ 150 k€
New Institutes are Welcome !
Currently working on:
- test beam data analysis,
- electronics, construction
- software ( implementation in simulation of digi & reco…)
- physics simulations, …..

5. Collaborating Institutes & Tasks
Antwerp PMTs, FE, trigger, DAQ, funding; Electronics coordination
Athens Design, Q-plates, SW, MC, funding; Project coordination
CERN Beam test/EDR reports; SW-Physics coordination
Cukurova PMT testing, assembly
DESY FEA, construction, electronics, funding; Project coordination
JINR Dubna Mechanical design; Technical coordination
INR, Moscow Light guides & 2mm Q-plates
ITEP, Moscow Laser/LED calibration system
Northeastern Readout devices, MC, SW, construction

6. CASTOR Calorimeter Design
Calorimeter (10λI): (2)EM + (12)HD sections, 224 channels

7. CASTOR Calorimeter on Support
2 (½) calorimeter sections

8. CASTOR Calorimeter Installation
Collar HF

9. CASTOR in beam line: Collar platform with HF, Collar and Rotating shielding

10. Construction & Commissioning Schedule v1.6 (20-10-07)

11. CASTOR Prototype Construction/Assembly Study
Construction of 32cm long, (½) calorimeter: 4 octants; (2) EM + (2) HD sections
Instrumenting one octant: (4) EM + (4) HD RUs
Design: DUBNA
Construction: DESY, Northeastern
Rear
Front

12. Prototype for BT 2007 Full length Octant
EM section 4 channels
HAD section full length 24 chan. 1 3 1 3
Octant container
Al plate

13. Construction of Prototype
Q-plate
W-plate

14. CASTOR beam test 2007
Full-length octant prototype

15. PRELIMINARY
day 2
day 14

16. μ- Βeam 50 GeV μ-
EM1
HD1 μ- μ-
EM3
PRELIMINARY

17. e- Beam
Channel
σ/E
PRELIMINARY

18. π- Beam
Channel
PRELIMINARY
σ/E

19. Summary  New Institutes are welcome !
Forward Physics spans a broad range of pp and HI high energy physics topics, from fundamental properties of QCD to new physics phenomena.
Large cross sections ensure early publications on various topics.
Discovery potential:
- Beyond Standard Model (BSM): Large amount of missing transverse energy (MET)
- Higgs: Vector-Boson-Fusion (VBF): Two jets at forward/backward rapidities (pp→jj H X). Lower background than the dominant gluon-gluon fusion channel (see David’s talk).
- Exotics in HI Interactions: “Strangelets”, Disoriented-Chiral-Condensates (DCC)
CASTOR calorimeter project is progressing fast:
- Lots of data taken in test beam; Analysis under way.
Engineering design review scheduled for the 31st October. Document in final stage.
Construction of calorimeter to start in November 2007.
Aim & need to be in beam line as soon as LHC starts, to take advantage of low lumi runs.
 New Institutes are welcome !