ILC Detector R&D

William Morse ILC R&D April 19, 2006

1

ILC Detector R&D

William MorsePhysics Dept., BNL


2

ILC SiD Detector Concept

• BNL has joined SiD last fall, which is one of four ILC detector concepts.

• First draft of the SiD Detector Outline Document submitted to LC World Wide Study last month (150p).

• Forward Detector Section written by BNL (W.M. coordinator).

• Web site: http://www-sid.slac.stanford.edu/

http://www-sid.slac.stanford.edu/


3

Forward Region Physics

• Measurement of beam-strahlung pairs for ILC bunch characterization (BeamCal).

• Measurement of forward Bhabha pairs for precision measurement of luminosity normalization (LumCal) to 210-4.

• Maintain detector hermeticity (missing PT) down to very small polar angles (5mrad).


4

Forward Detector Challenges

• Radiation Hardness (10MGy/year)• Interfacing with the final focus elements• High occupancy rates (104 pairs/BX)• Good efficiency, energy and position

resolution in the presence of very high backgrounds

• Fast readout to guide beams together


5

SiD Forward Detector Coordinators

• Detector Hermeticity with BeamCal/LumCal – Morse• Monitoring the Instantaneous Luminosity with BeamCal

and GamCal – Morse• LumCal Physics Requirements – Morse• Occupancy Issues in the Forward Direction – Morse• Radiation Damage Issues in the Forward Direction – Li• Space, Support, and Integration Issues – Lissauer• Readout Issues – Lanni• R&D Plan – Lissauer• Physics: Lanni, Lissauer, Morse; Instrumentation: De

Geronimo, Li, Mead, Radeka, Rescia; S.C. Magnet Div: Bret Parker; U. Oregon: Dave Strom


6

What is Beam-strahlung?• Flat beam with length L, half-width B, half-height

A, L >> B >> A, = Ne/4ABL• Ev = y/0 Bh = y/c0 • Fv = e(1- 2) y/0 (space charge force)• Two bunches overlap:• E = 0 Bh = 2y/c0 – up to 1 KT for ILC• Fv = 2ey/0

• Power radiated in gammas ( F)2 0.5 MW at ILC


7

Beam-strahlung and Pairs

• Bethe-Heitler pair created when meets incoming e and converts to pair

• B.H. cross-section about 610-26 cm2

• Pairs N Ne /AB• Energy in pairs over energy in gammas is

proportional to Ne /AB, ie. almost luminosity!

• Submitted as a LC Tech Note


8

Collaborating with W. Lohman and M. Ohlerich (DESY)Pairs (TeV) and Gammas (MTeV)

0

40

80

120

160

200

-200 -100 0 100 200

offset (nm)

Pair

E (T

eV)

70

75

80

85

90

95

pairsgammas


9

BeamCal and LumCal

• Silicon Tungsten Calorimeters

BeamCal LumCal

Polar angle 3 - 20 mrad 20 – 140 mrad

L 3.2m 1.7m

<E>/BX 20 TeV 10 GeV


10

BeamCal – 14mrad crossing angle


11

Maximum missing PT for smu → mu LSP vs LSP mass for different smu masses

ECM = 0.6 TeV e+e- -> smu+ smu-

0

50

100

150

200

250

300

0 50 100 150 200 250 300LSP mass (GeV)

Max

imum

mis

sing

PT

(GeV

)

300 GeV200 GeV100 GeV


12

Hermeticity Requirements

• Hep-ph/040601 (2004) P. Bambade et al.• Experimental Implications for a LC of the

SUSY Dark Matter Scenario• M(LSP) = 212GeV, M(stau) = 217 GeV• Need to veto ee→ee and ee→ee

backgrounds at 10-3 level – being studied by Tel Aviv as part of FCAL effort.

• BNL will study Bhabha pileup


13

Luminosity Normalization

• Goal is precision measurement to 2 10-4

• Bhabha cross-section in forward direction

(mrad) 118

2/sin2/cos1

8

2max

2min

4

2

2

2

BXN

Edd


14

Possible Readout Architecture F. Lanni


15

Forward Detector R&D Synergy with LHC Effort

• Simulation studies (p.20)• Integration studies (p.21)• Mechanical design (p.22)• Readout (p.23)• Detail detector design (p.24)• Material studies (p.25)• Hadronic calorimeter (p.26)• SiD web site: http://www-sid.slac.stanford.edu/





16

Conclusions

• Part of SiD Study since Fall 2005 (mostly U.S. based)

• Part of FCAL Study since March 2006 (mostly Europe based)

• Synergy with BNL S.C. Magnet Div.• Synergy with BNL Instrumentation Div.• Synergy with LHC Effort


17

Extra Slides


18

Where Do The Pairs Go?

• Analytic Calculation

0

1

2

3

4

0 1 2 3 4 5 6 7 8 9 10

E (GeV)

max

bet

atro

n di

st (c

m)

L=2mL=0.5m


19


20

Simulation Studies• Optimization of the design taking in to account

space, cost and technology. This includes segmentation, both longitudinal and transverse and the dynamic range needed. We expect that the simulation studies will need a few iterations to help in optimizing the system integration aspects as well as cost. Preliminary decisions Dec. 06, Baseline Detector Layout: Mid ’07. The baseline should define in details the specifications and the parameters for the Beam Cal and the Luminosity Cal. Studies to be done by Physicists – assume baseline support.


21

Integration Studies• The forward region is very crowded and the

space needs to be shared with the magnets of the final focus, beam pipes, forward calorimeters and their services. Detailed engineering studies to integrate and coordinate these requirements needs to be done at an early stage. Conceptual design for space allocation, services, access and installation by fall of ’06 and a baseline design by mid ’07. Design effort: ¼ Designer time. Baseline should be ready in one year to allow for space allocation between the different detector and first layout of services routing.


22

Mechanical Design• The forward calorimeters have special

requirements. For example, we expect that the beam pipes will need to be integrated with the Beam Cal to achieve maximal coverage. Detailed mechanical design that takes into account the constraint imposed by the space limitation needs to take place. This should include the support of the calorimeters off the forward tube. Conceptual design end of ’06. Baseline design fall of ’07. Mechanical Engineer/Designer: ½ FTE. Technician: Prototype work on assembly concepts.


23

Readout

• Define readout architecture, develop readout solutions and test some of the ideas in the Lab and/ or test beams. The readout work should include calculations of the Beam Cal feedback needed for the machine as well as for physics events. Conceptual design and detail specifications by end of ’06 , Baseline readout architecture 18 month from now. Electronic Eng: 1/3 of an electronic Eng.


24

Detail Detector Design

• Once the readout and the mechanical layout are established a detail integration of the readout and the mechanical set up is needed. This will include the layout of the Si sensors, routing of the signals to the readout and cabling of the detector.


25

Material Studies• The radiation level in the forward direction

implies that one will need to probably specify specialized Si material. One needs to select the materials and expose them to radiation levels equivalent to what will be seen at the ILC forward region over period of 5 years. BNL Instrumentation Division has a facility that will allow us to do this. Selection of material and radiation tests – end of ’06 early ’07. Selection of Sensor material mid ’08. ¼ designer for preparation of Si wafers for tests, plus material costs.


26

Hadronic Calorimeter• Depending on the technology choice for the

Hadronic calorimeter for SiD, the Forward section of the Hadronic calorimeter might need to have a different technology. The R&D part will include choice of technology for the forward hadronic calorimeter and a detail design. Designer 1/3 time, Technician ½ time, ME 1/3 time. For the above we would like to test some of the ideas and build a mechanical prototype and, given the financial resources, to test it in a beam. This effort should be coordinated with other prototypes in SiD.


27

Total of Above Forward Region Manpower

• One man-year each: tech, designer, ME, EE

• 3 physicists 2 years• 1 Simulation• 1 Readout R&D coordination• 1 Integration of the Forward region

• Present level of effort is 1.3 physicists and 0.2 tech, designer, ME, EE; so it will take 5 years, not 2 years.


28

Particle Flow• ILC is a precision measurement machine.• The hope is particle flow will give 30%/E0.5 jet

resolution which is needed to do precision measurements.

• Situation in Europe is about three dozen very smart people working 20% of their time on PFA.

• The U.S. is effort is not as large.• US effort needs better coordination – BNL can

make a difference.

Date post:	15-Mar-2016
Category:	Documents
Upload:	callum-holman
View:	85 times
Download:	0 times

ILC Detector R&D

Documents