MDI Workshop at IAS Conference, January 2020 HKUST, Hong Kong On behalf of the ILD Collaboration (Selected) MDI Issues of IJCLab IJC=Irène Joliot-Curie Roman Pöschl Most of the material shown today has been taken from ILD IDR (in preparation)
MDI Workshop at IAS Conference, January 2020 HKUST, Hong Kong
On behalf of the ILD Collaboration
(Selected) MDI Issues of
IJCLab IJC=Irène Joliot-Curie
Roman Pöschl
Most of the material shown today has been taken from ILD IDR (in preparation)
2IAS – MDI Workshop – Jan. 2020
IJCLab The ILC Project
• CM-Energy: 100 - 1000 GeV, 500 GeV baseline in TDR Superconducting cavities• Electron (and positron) polarisation• TDR in 2013 + DBD for detectors• “Rebaselining” in 2017, starting energy is 250 GeV • ILC benefits from construction of European XFEL
• first light on May 3rd 2017
the TDR baseline design
• Towards the ILC?• Strong efforts in Japan to host project • Since 2013: LC went through a detailed review process in Japan
• March 2019: Japanese Government expresses it's interest in the project
• Before and after establishment of contacts at political level (mainly US, France, Germany)
• SCJ will publish Master Plan in Jan.2020• MEXT intervention at ICFA/LCB Meeting in Feb. 2020
3IAS – MDI Workshop – Jan. 2020
IJCLab ILC Physics Program
mZ
ee->ZH
tt-threshold
top-continuum
tth-threshold 1 TeV2xmW
All Standard Model particles within reach of planned e+e- colliders
High precision tests of Standard Model over wide range to detect onset of New Physics
Machine settings can be “tailored” for specific processes• Centre-of-Mass energy• Beam polarisation (straightforward at linear colliders)
Background free searches for BSM through beam polarisation
New Physics
L/1034 cm-2s-1
0.6 0.7 1.0 1.8 3.8
4IAS – MDI Workshop – Jan. 2020
IJCLab Detector Requirements
Track momentum: σ1/p < 5 x 10-5/GeV (1/10 x LEP) ( e.g. Measurement of Z boson mass in Higgs Recoil) Impact parameter: σd0 < [5 ⊕ 10/(p[GeV]sin3/2θ)] μm (1/3 x SLD) (Quark tagging c/b) Jet energy resolution : dE/E = 0.3/(E(GeV))1/2 (1/2 x LEP) (W/Z masses with jets) Hermeticity : θmin = 5 mrad (for events with missing energy e.g. SUSY)
Final state will comprise eventswith a large number of chargedtracks and jets(6+)
• High granularity• Excellent momentum measurement• High separation power for particles
Particle Flow Detectors
5IAS – MDI Workshop – Jan. 2020
IJCLab ILC @ Kitakami
● Candidate site is in North-East Japan● Kitakami ● Iwate and Miyagi Prefectures
● Mountainous region
● Striking advantage ● ILC can be built in a solid granit rock
of about 50km in length ● Little displacement “in one piece” during
Big Eastern Japanese Earthquake in 2011
6IAS – MDI Workshop – Jan. 2020
IJCLab ILC250 – Dimenions and (main) parameters
Main change for new baseline: ● Smaller horizontal emittance: 10 μm -> 5 μm
● => Higher instantaneous luminosity: 0.82 -> 1.35 x 1034 cm-2 s-1
● and higher beamstrahlung: δBS
= 2.62%
Details of beam parameters after rebaselining see backup
7IAS – MDI Workshop – Jan. 2020
IJCLab ILC – Two detectors – Push Pull
● ILC will have one Beam Deliver System● Two detectors ILD and SiD will share the interaction point● Push Pull operation
Total weight15500 t
8IAS – MDI Workshop – Jan. 2020
IJCLab Push Pull and site related infrastructure
9IAS – MDI Workshop – Jan. 2020
IJCLab The ILD Detector
● Relevant for MDI: B-Field of 3.5-4 T and integrated dipole QD0● Integrated dipole moves with detector ● More details in following slides
10IAS – MDI Workshop – Jan. 2020
IJCLab Experimental conditions for ILD
● Instantaneous Luminosity: 1.35 x 1034 cm-2 s-1● Longitudinal polarisation of electron (80%) and positron (30%) beams● Moderate losses from beamstrahlung δ
BS = 2.62%
● Pulsed beam structure with pulse length of ~1ms and repetition rate of 5-10 Hz (more?)● Beam crossing angle of 14mrad at interaction point
Luminosity spectrum @ 250 GeV Luminosity spectrum @ 500 GeV
11IAS – MDI Workshop – Jan. 2020
IJCLab “Large” and “Small” ILD Detector
Different outer TPC radii – Different magnetic field values
12IAS – MDI Workshop – Jan. 2020
IJCLab Interplay of Machine and Detector
13IAS – MDI Workshop – Jan. 2020
IJCLab From machine to detector – The “last step”
● Beams collide under 14mrad crossing angle ● Focusing into the interaction region with final doublet QD0 and QF1
● QD0 is part of detector (ILD) and QF1 is part of the machine● See more details on final focus magnets in talk by B. Parker
14IAS – MDI Workshop – Jan. 2020
IJCLab Modification of forward region
Design of ILD forward region until 2015
● Different focal length L* for ILD (4.4m) and SiD (3.5m)● Machine request for a uniform L* ● Had to save 30cm in ILD● Main option vacuum pump
15IAS – MDI Workshop – Jan. 2020
IJCLab Study of development of vacuum
UNDER STATIC CONDITION QD0 + IP region
IP
Pumps 2*15 l/s
Valves dn40
Valve dn100QD0
Pumps 120 l/S
T=293K T=293KT=10K
Without outgassing valves dn40
Without baking
T=293K
τ (H2) ≈ 5.10-12 mbar.l.s-1.cm-2
τ (CO) ≈ 1.10-13 mbar.l.s-1.cm-2
τ (H2O) ≈ 2.10-11 mbar.l.s-1.cm-2
τ (CO2) ≈ 1.10-13 mbar.l.s-1.cm-2
T=10K
τ (all gases) ≈ 0 mbar.l.s-1.cm-2
σ (sticking coeff CO, CO2, H2O) = 1
For H2 pumping by holes in beam screen 2% surface
Distance (cm)
Pre
ssio
n (
mb
ar)
Comparison of a Monté-Carlo simulation and analytical simulation for H2O
Simulation Monté-Carlo(Molflow)
After 100h pumping
Comparison ofanalytical calculationand simulationfor validation purposes
16IAS – MDI Workshop – Jan. 2020
IJCLab Vaccum in IP region for different configurations
DP0 + IP Pumps IP 120 l/s Without baking 5,6 nTorr H2O initial
DP0 + IP No pumps IP Without baking 120 nTorr H2O DP0 and IP volumenot separated / Lengthreduction
DP0 + IP Neg coating Baking IP 0,23 nTorr H2/H2O
Length reduction
DP0 + IP Neg satured Baking IP 1,4 nTorr H2O /H2
Length reduction
● Without pump vacuum in IP region around ~20 times worse than with pump● Excellent vacuum could be recovered with NEG coating ● ... at the expense of the need for baking of the beam pipe to activate the NEG
~100h at 180o C
17IAS – MDI Workshop – Jan. 2020
IJCLab Which vacuum can be tolerated?
● Beam gas background much smaller than pair induced background● May live with relatively relaxed vacuum conditions
● Note, so far only static vacuum has been considered. ● What about dynamic vacuum? (Typically not an issue for LC dixit expert)
18IAS – MDI Workshop – Jan. 2020
IJCLab Current design of ILD Forward Region
= 4.1m
19IAS – MDI Workshop – Jan. 2020
IJCLab ILD Magnet
Solenoid with anti-DID
● Solenoidal field of up to 4.5 T● Detector Integrated Dipole to control
Beam background
ILD Magnet Yoke
● Shield the environment from the ILD B-Field● Convention: Stray field has to be as small as 50 Gauss at
● 15m off-axis ● Will allow to use iron tooling for detector in garage position
● See SLAC-PUB-13657
20IAS – MDI Workshop – Jan. 2020
IJCLab ILD Magnet – Field Maps I
Example 4 T Field along z-axis in ILD Large model
4 T
21IAS – MDI Workshop – Jan. 2020
IJCLab ILD Magnet – Field Maps II
ILD Large Model - ILD stray field if magnet operated at 4 T
● Stray field meets requirements ● Story over?
● Iron yoke is cost driver● Reducing the amount of iron?
6 mT
22IAS – MDI Workshop – Jan. 2020
IJCLab ILD Magnet – Thinner Yoke?
60cm iron off
● Cost reduction of about 20%● Stray field at 15m 9.3mT
Reduction to ~2m thickness
● Cost reduction of about 50%● Field ~100mT at 1m ● Requires shielding wall that has to
move with detector● Radiation safety?
23IAS – MDI Workshop – Jan. 2020
IJCLab Anti-DiD and Beam background
0.036 T
Anti-DiD Field
Detailed simulation:Beam background in ILD BeamCal from e+e- pairs provoked by beamstrahlung
w/o anti-DID w/ anti-DID
● Hit spectrum more symmetric with anti-DID● (difficult to see)● ~30% Less energy deposit with anti-DID● More details on beam background, see talk by D. Jeans
24IAS – MDI Workshop – Jan. 2020
IJCLab Power pulsing
Mastering of technology is essential for operation of ILC detectors
● Electronics switched on during > ~1ms of ILC bunch train and data acquisition ● Bias currents shut down between bunch trains
N.B. Final numbers may vary
25IAS – MDI Workshop – Jan. 2020
IJCLab CALICE beam test 2018 - Systematic study of power pulsing
Pedestal variation Variation of MIP response
● Small pedestal variation● About 0.6% of a MIP
● Around 3.4% smaller response to MIP● However, stable MIP response observed● Effect understood and can be corrected for
Analogue hadron calorimeter:Parameters for power pulsing 20-50 Hz repetition rate, 15ms acquisition window, switch on time 150 μs
Work in progress Work in progress
26IAS – MDI Workshop – Jan. 2020
IJCLab ILD - (Estimated) Power consumption
Repartition of underground power consumptionPower consumption
On surface:
Computer Farm – 1000 kWHe Compressors - 800 kWHVAC - 600 kWAir Compressors - 50 kWTotal: 2450 kW
Underground:
Total: 982 kW
Full breakdown of estimated power consumption – See backup
27IAS – MDI Workshop – Jan. 2020
IJCLab Power supply – Example SiEcal
Zoom into ILD Ecal barrel
● Total average power consumption20 kW for a calorimeter system with 108 cells*● Only possible through PP
● The art is to store the power very locally
● Issue for upcoming R&D
*Compare with 140 kW for CMS HGCAL FEE 6x106 cells
.
.
.
PowerSource~52 V
Slab column15x600mA, 36 W
DCDCConverter12V/4VIn SiECAL Hub 2
SiECALPatch panelCurrent ~25A
Power cable trailer <-> SiECAL Patch panel
DCDCConverter48V/12VIn SiECAL Hub 1
SiEcal Hub1
SiEcal Hub1Serves one barrel module
x5
28IAS – MDI Workshop – Jan. 2020
IJCLab Cabling scheme
29IAS – MDI Workshop – Jan. 2020
IJCLab Summary and conclusion
● ILD gets ready for ILC approval
● MDI issues play a central role in the concept of ILD● Push pull scheme of ILD detectors is design challenge
● Change of L* triggered redesign of ILD forward region● Removal of vacuum pump
● Interplay between ILD Magnets and beam are under constant scrutiny ● Careful analyses of e.g. stray field to understand impact on second detector in garage position● Magnet return yoke is cost factor, study on material reduction ongoing ● Study of background levels (more in talk by Daniel Jeans)
● Study of services for IDR● Estimation of power needs● Example for SiEcal given today● Power pulsing is key design element for all ILD sub-detectors
● System aspects will be central to future detector R&D● Further aspects are services in terms of gas and cooling water
Backup
31IAS – MDI Workshop – Jan. 2020
IJCLab Modification of forward region
UNDER STATIC CONDITION QD0 + IPregion
IP
Pumps 2*15 l/s
Valves dn40
Valve dn100QD0
Pumps 120 l/S
T=293K T=293KT=10K
Without outgassing valves dn40
Without baking
T=293Kτ (H2) ≈ 5.10-12 mbar.l.s-1.cm-2
τ (CO) ≈ 1.10-13 mbar.l.s-1.cm-2
τ (H2O) ≈ 2.10-11 mbar.l.s-1.cm-2
τ (CO2) ≈ 1.10-13 mbar.l.s-1.cm-2
T=10K
τ (all gases) ≈ 0 mbar.l.s-1.cm-2
σ (sticking coeff CO, CO2, H2O) = 1
For H2 pumping by holes in beamscreen 2% surface
Distance (cm)
Pre
ssio
n (
mb
ar)
ΣP = 7,5 10-9 mbar ~ 5,6 nTorr
32IAS – MDI Workshop – Jan. 2020
IJCLab ILC Parameters
33IAS – MDI Workshop – Jan. 2020
IJCLab Modification of forward region
IP
Pumps 2*15 l/s forall gases
Valves dn40
Valve dn100
QD0Pumps 120 l/s for all gases
VACUUM DISTRIBUTION ON ILD
UNDER STATIC CONDITION QD0 + IP region
H2O
CO2
CO
H2
T=293K T=293KT=10K with bakingT=293K
Between valves dn40 and dn100
τ (H2) ≈ 2.10-13 mbar.l.s-1.cm-2
τ (CO) ≈ 2.10-15 mbar.l.s-1.cm-2
τ (H2O) ≈ 0 mbar.l.s-1.cm-2
τ (CO2) ≈ 5.10-16 mbar.l.s-1.cm-2
IP region
Alu or Cu or SS after 100h pumping
Without baking
T=293K τ (H2) ≈ 5.10-12 mbar.l.s-1.cm-2
τ (CO) ≈ 1.10-13 mbar.l.s-1.cm-2
τ (H2O) ≈ 2.10-11 mbar.l.s-1.cm-2
τ (CO2) ≈ 1.10-13 mbar.l.s-1.cm-2
T=10K
NEG coating
τ (all gases) ≈ 0 mbar.l.s-1.cm-2
σ (sticking coeff CO, CO2, H2O) = 1
For H2 pumping by holes in beam screen 2%surface
L=30 cm Ø = 179 mm
sticking coeff σ( CO;CO2)=0,1σ(H2)=0,0005σ(H2O)=0,0005 ??
ΣP = 3 10-10 mbar ~ 0,23 nTorr
Pre
ssio
n (
mb
ar)
Distance (cm)
34IAS – MDI Workshop – Jan. 2020
IJCLab Modification of forward region
IP
Pumps 2*15 l/sfor all gases
Valves dn40
Valve dn100QD0
Pumps 120 l/s for allgases
VACUUM DISTRIBUTION ON ILD
UNDER STATIC CONDITION QD0 + IP region
H2O
CO2
CO
H2
T=293K T=293KT=10K with bakingT=293K
Between valves dn40 and dn100
IP region
Alu or Cu or SS after 100h pumping
Without baking
NEG coating saturedL=30 cm Ø = 179 mm
sticking coeff σ( CO;CO2)=0σ(H2)=0σ(H2O)=0
ΣP = 1,8 10-9 mbar ~1,4 nTorr
Pre
ssio
n (
mb
ar)
Distance (cm)
τ (H2) ≈ 2.10-13 mbar.l.s-1.cm-2
τ (CO) ≈ 2.10-15 mbar.l.s-1.cm-2
τ (H2O) ≈ 0 mbar.l.s-1.cm-2
τ (CO2) ≈ 5.10-16 mbar.l.s-1.cm-2
T=293K τ (H2) ≈ 5.10-12 mbar.l.s-1.cm-2
τ (CO) ≈ 1.10-13 mbar.l.s-1.cm-2
τ (H2O) ≈ 2.10-11 mbar.l.s-1.cm-2
τ (CO2) ≈ 1.10-13 mbar.l.s-1.cm-2
T=10Kσ (sticking coeff CO, CO2, H2O) = 1
For H2 pumping by holes in beam screen 2%surface
35IAS – MDI Workshop – Jan. 2020
IJCLab ILD – Breakdown of power consumption
.
.
.
PowerSource~52 V
Slab column15x600mA, 36 W
DCDCConverter12V/4VIn SiECAL Hub 2
SiECALPatch panelCurrent ~25A
Power cable trailer <-> SiECAL Patch panel
DCDCConverter48V/12VIn SiECAL Hub 1
SiEcal Hub1
SiEcal Hub1Serves one barrel module
x5