1. for the HADES Collaboration
SIS100 - setup - News concerning the SIS100 experiment - HADES/CBM cave design, space, beam line concept, – subsystems - Possible upgrades
Jerzy Pietraszko
for the HADES Collaboration
GSI Helmholtz Centre for Heavy Ion Research GmbH Planckstrasse 1, D Darmstadt, GERMANY

2. SIS (heavy-ion synchrotron ) at GSI Darmstadt
SIS18, SIS100 and SIS300
SIS (heavy-ion synchrotron ) at GSI Darmstadt
Energy ranges
SIS18: 197Au up to 1.25 AGeV
SIS100: 197Au up to 11 AGeV - future
SIS300: 197Au up to 35 AGeV - future

3. Experiments at SIS100
HADES
CBM

4. HADES at SIS100

5. T0 and beam monitoring detectors
Low material budget (low interaction probability), good time resolution (below 50 ps)
In vacuum operation, located “somewhere” in front of the target
High rate capability: 109 ions /s, 1011 protons /s,
Tracking of single beam ions,
 scCVD diamond, 50 m thickness or less,
 large area: several cm2
 fast, precise readout electronics
CBM beam line aperture

6. HADES/CBM cave preparation – radiation safety - consequences
A. Senger
No space for FWall – has to be shortened or PSD 6

7. Neutral mesons in HADES Calorimeter for HADES (lead glass)
ECAL
Substitute for Pre-Shower (18º<Θ<45º, 8 m2;18 tons)
 improved el/ separation and
 full reconstruction of pº and η allows to fix their Dalitz contributions to the e+e- cocktail
Calorimeter for HADES ( )
 substitute for Pre-Shower (18º<Θ<45º, 8 m2;18 tons)
η reconstruction C+C, Ni+Ni
Measured energy resolution
e/p separation
ECAL TDR submitted !!!!
last week

8. RICH – key detector for dielectron measurements at SIS100
improvements proposed in 2009 (TDR of HADES at SIS100)
Rich detector
Radiator gas:
C4F10, thr = 18 (hadron blind)
photon detector: CsI photo cathode
Three scenarios have been studied for RICH at SIS100:
(M.Weber)
Use of different radiator gases
Extension of the radiator length
Upstream shift of the photon detector.
Important issues for long term, high rate stable operation:
Detector stability (HV, load)
Noise reduction capability (time measurement)
fast DAQ
 maybe PMTs ????
Dedicated study needed, hardware, software experts !!!

9. MDC – key detector for any measurements at SIS100
Wire chambers:
Go to Ar+CO2 for all layers,
Test stability with Ar+CO2
Plane II with Ar+CO2 - on going test ...
Spare chambers: one-two per layer., fast exchange procedure.
Straw-tubes as MDC plane 0
(between RICH and MDCI) ?
Electronics:
New readout system needed, fast multi-hit TDC
New analog part needed or re-use ASD8 chip
ASD8 chip – seems to be the best ever produced
ASDBLR (ALTLAS) slower and less sensitive than ASD8
Panda straw chip – design phase
Dedicated study needed, hardware, software experts !
Low mass tracking system
single cell resolution: 100 m
4 planes / sector (high res. mode)
example: , ASC8 chip, Sr

10. Upgrades for FAIR - summary
List of HADES upgrade subprojects:
 ECal
 almost settled, TDR submitted !!!
 open issue: RPC mounting on ECal
 RICH
 Time and ADC
 Better photon efficiency
 Stability
 MDC
 Fast readout
 Spare chambers, Plane 0 between RICH and MDC I
 DAQ-Upgrade
 Go from TRB2  TRBv3 (beam detectors)
 DAQ rate increase by a factor of 10 !!!
 Reaction plane reconstruction: FWal or CBM PSD ?
 PID for low theta region (< 18 degree) – what is possible ?

11. Summary
- Well defined list of possible upgrades - A lot of experts available in HADES
(FPGA, Hardware, software, simulation) - Synergies with other FAIR projects (PANDA, CBM) - Costs ?
- Activities need to be started soon.

12. Thank you