1. CEPC Detector Geometry Design & Validation
Xu Yin, Chen Xun, Zheng Xiangyu, Ruan Manqi

2. Outline Motivation Technical preparation Organization
CEPC Geometry Editing & Validation
Software Code and Database Maintenance
Summary

3. Motivation Towards CEPC detector(s): lots of geometry changes
ILD Provides perfect reference, however, detector geometries need to be re-considered at CEPC
Towards CEPC detector(s): lots of geometry changes
We need to have the RIGHT geometry in the RIGHT Simulation Framework

4. Technical preparation
A very successful training at Nankai University
40+ participants: including G4 experts, Software experts, and Simulation contact person from sub-groups
Lecturer:
Emilia Becheva (Mokka experts from LLR, Ecole polytechnique)
Xuyin, Manqi
Objective reached: We can modify geometry up to source code level/data base level
Lots of students gain basic ability to use CEPC software and express the interesting in working on CEPC
MANAGE and RELEASE the CEPC geometry model, DEFINE reference parameters for simulation and reconstruction.
Collection of requirements, coordinate the development of CEPC simulation R&D

5. Training
A Dedicated Geant4-Mokka training had been held in Nankai Univ. last month
Many Thanks to Emilia(Bechva) and LLR!

6. Organization and Status
Center Simulation Team:
Making Standard,
Global geometry modification & Integration,
Framework/database Maintenance
Technical support
Sub Detector Simulation Team:
Local geometry design & Validation
Performance test and digitizer
Currently, center simulation team is responsible for almost all geometry changes.
In the future, Sub-Detector teams should submit their own code (according to the center standard) to center team, while the latter will integrate the code into the full framework.

7. Center Simulation Team
Staff:
XuYin, Chen Xun,
2 Students(Zheng Xiangyu, Yang Yujiao) work with me now
Global geometry modification & Integration
example as follow slides
Standard Framework
Manage and release standard software/simulation version
Maintain the center database, synchronize with local ones
Technical support
make a standard, and ask sub-detector to follow those standard
Collect requirements, coordinate sub-detector simulation teams
Also to follow future development of Simulation framework (DD4hep, GDML, etc)

8. CEPC Geometry Editing We develop a new test model -- CEPC_v0.
In the current version, all this geometry changes is implemented at database level + hard code level.
Full Simulation & Reconstructions is being tested.
New Detector Concept
CEPC
New mode
CEPC_v0
New Sub_detector
LumiCalV_cepc, tube_cepc, mask_cepc, ftd_cepc
Remove Sub_detector
LHcal01, SServices_O2_v00
New Driver
SLcal04, FTD_cepc
New Database
mask_cepc_14, tube_cepc_14

9. Scale for 250GeV
We start the work from ILD_o2_v06, where TPC length & radius is reduced by 20%-25% and HCAL outer layer is reduced as well. Calorimeter layer numbers & granularity can also be changed.

10. Scale for 250GeV
TPC (big grey cylinder) length is set to be 1900 mm (from default of 2350 mm). The Green pipe represents QD0 & its supporting structure (low-temperature + shield). Thus the plot represents L* = 1800 mm. Of coz, the radius & z position of this green pipe is adjustable. That’s where we need input from ACC. group.
halfZ 1900mm
Radius 1365mm

11. Cooking a test version of inner detector geometry for smaller L*
The pair of red cylinders represent LumiCal, which is placed next to a Forward tracking disk.
The total pair of tracking disks is reduced from 7 pairs to 5 pairs .
The tube is being shorted as well.
The QD0's radius is enlarged and put next to LumiCal(working now).

12. More Modify The work above is summarizing to CEPC Note. 1900mm 80mm
The Ecal barrel halfz is changed
The VXD length is changeable
The work above is summarizing to CEPC Note.

13. Verify with HitMap

14. Verify with HitMap
ftd

15. Full Simulation Validation

16. Full Simulation Validation
E250-TDR_ws.Pnnh.Gwhizard-1_95.eL.pR.I stdhep
These work above is summarizing to CEPC Note.

17. Software Code and Database Maintenance
Current version: CEPC_v0
MySQL Database:
Source Code: lxslc5.ihep.ac.cn:/besfs/groups/higgs/data/workarea_xy/soft/v
We also provide the virtual machine image for simulation
And we will coordinate the synchronization of database and source code between servers

18. Summary
Our goal is to have the full access to geometry editing. In other word, do whatever needed in current simulation framework. We believe it’s under control.
We have released and will maintain the CEPC simulation framework test version(source code & database) on IHEP server and will provide technical support persistently

19. Xu Yin, Chen Xun, Zheng Xiangyu, Ruan Manqi
Thanks
Xu Yin, Chen Xun, Zheng Xiangyu, Ruan Manqi

20. backup

21. Mokka Framework C++ Drivers MySQL Database Mokka Detector Concept
Model
Sub-detector
Parameter1
Parameter2
…….
MySQL
Database

22. CEPC_v0 Sub_detector Name Database Driver Order vxd07 SVxd04 20
SEcal05
VOID 90
LumiCalV_cepc
SLcal04
100
SHcalRpc01
110
tube_cepc
Tube_cepc
tubeX01
150
mask_cepc
maskX01
160
tpc10_01
tpc10
200
sit_simple_planar_sensors_03
SIT_Simple_Planar
210
ftd_cepc
ftd_simple_staggered_02
FTD_cepc
220
set_simple_planar_sensors_01
SET_Simple_Planar
230
SCoil03
SCoil02
400
yoke05
yoke04
500
BeamCal08
beamcalX08
BeamCal01
650
SField01
1000

23. Key Parameter Compare with ILD_o2_v06
CEPC_v0
ILD_o2_v06
Ecal_Barrel_halfZ
1900
2350
TPC_outer_radius
1365
1808
VXD_length_r1 80
62.5
VXD_length_r3
150
125
VXD_length_r5
QD0 zStart
1600
4050
QD0 rOuter
250 30
FTD Disk
5 pairs
7 paris
LumiCal
1472
2471.8

24. CEPC_v0 Model Parameters
Parameter Name
Default Value
Coil_extra_size
1522
Coil_Yoke_radial_clearance
250
Ecal_Barrel_halfZ
1900
Ecal_endcap_extra_size
60.8
Ecal_support_thickness
9.3
Ecal_Tpc_gap 35
Field_nominal_value
3.5
Hcal_back_plate_thickness 15
Hcal_Coil_additional_gap
29.5
Hcal_Ecal_gap 30
Hcal_endcap_center_box_size
700
Hcal_endcap_ecal_gap
Hcal_endcap_sensitive_center_box
Parameter Name
Default Value
Hcal_endcap_zmin
2670.7
Hcal_nlayers 48
Hcal_sensitive_model
PRC2
ILC_Main_Crossing_Angle 14
Lcal_inner_radius 80
Lcal_outer_radius
195.2
Lcal_z_begin
2505
Lcal_z_thickness
135.6
TPC_inner_radius
329
TPC_outer_radius
1365
TUBE_crossing_angle
TUBE_opening_angle
VXD_active_silicon_thickness
0.05
Parameter Name
Default Value
VXD_inner_radius 16
VXD_length_r1 80
VXD_length_r3
150
VXD_length_r5
VXD_radius_r1
VXD_radius_r3 37
VXD_radius_r5 58
VXD_side_band_electronics_width
0.5
VXD_support_ladder_material
graphite
VXD_support_ladder_thickness
0.134
Yoke_endcap_inner_radius
300
Yoke_thickness
2550

25. Simulation steer parameters
/Mokka/init/detectorModel CEPC_v0 /Mokka/init/dbHost /Mokka/init/user consult /Mokka/init/dbPasswd consult /Mokka/init/globalModelParameter Ecal_Sc_Si_mix /Mokka/init/globalModelParameter Ecal_nlayers1 10 /Mokka/init/globalModelParameter Ecal_nlayers2 5 /Mokka/init/globalModelParameter Ecal_nlayers3 0 /Mokka/init/globalModelParameter Ecal_radiator_layers_set1_thickness 4.2 /Mokka/init/globalModelParameter Ecal_radiator_layers_set2_thickness 8.4 /Mokka/init/globalModelParameter Ecal_radiator_layers_set3_thickness 0 /Mokka/init/globalModelParameter Ecal_Si_thickness 0.8 mm /Mokka/init/globalModelParameter Hcal_nlayers 45 /Mokka/init/globalModelParameter Hcal_cells_size 1

26. CEPC_v0

27. FTD Disk
5 pairs
FTD: Blue
LumiCal: Red
Mask_QD0: Green