Status of day-one experiment commissioning at COSY

1. Goa, Mar. 11-15 2013 Status of day-one experiment commissioning at COSY Huagen Xu

2. Goals of day-one experiment at HESR Day-one location • Pbarp elastic scattering • Coincidence (forward&recoil) • Large range of t : 0.0008-0.1 GeV2 Cluster target at ANKE • Test method • Recoil arm construction • Commissioning at COSY COSY

3. Recoil Arm Top view • Si : 76.8 x 50 x 1 (mm) (1.2 mm pitch) • Ge: 80.4 x 50 x 5/11 (mm) (1.2mm pitch) Fixed plane for commissioning

4. Part 1: Detectors • Achievements: • Test after rework for Si 2951-15 • To do: • Final assembly MICRON • Achievements: • High leakage current problem has been fixed • To do: • Test with new chamber • Final assembly

5. Part 2: FEE Mesytec: MPR16: 16ch with variable gain MPR1: for rear side MSCF16: 16ch with LE timing output MADC32: peak sensing ADC, input range and bit resolution selectable Received: quantity MPR-16 12 / 12 MPR-1 5 / 5 MSCF-16 12 /12 MADC-32 6 / 6 • Achievements: • All new required modules received • To do: • Test with final setup

6. Received: quantity • New NIM crate 2 To be received: quantity • Long cable set 14 • Achievements: • Crates, logic modules, NIM crates, racks are complete • Production of cables between detector and preamplifier are finished • To do: • Final assembly with long cable set

7. Part 3 : DAQ and test system DAQ hardware: - VME crate - 6 MADC32 - 1 CAEN V785 DAQ software: - IRQ mode (under work) - Online display (realized) New test chamber with coldhead: - 5.0e-8 mbar after cooling - 42K reachable with test Ge detector • Achievements: • Hardware are completed • To do: • Code work for DAQ • Ge test with new test chamber

8. Coldhead Preamplifiers Compressor Venting valve Vacuum gauge

9. Part 4: Cluster target • The expected specification of existing cluster target at ANKE location has been verified by target operating group. • The relevant change of the cluster target will be done together with the installation of recoil arm. Proposal to use the ANKE cluster target has been accepted by ANKE collaboration! • Achievements: • New collimator has been prepared • To do: • Changing the collimator and test its spec afterwards

10. Part 5: Detector chamber Existing target chamber • Achievements: • Chamber construction has been finished by week 8 at ZAT • To do: • Final assembly with detectors , Pt100 sensor as well as heater • Lab test for the complete setup

11. Detector chamber has been constructed

12. Side flange with cold plate

13. Part 6: Cooling and Temperature controller • Cooling for test chamber • LN2 solution & coldhead • Cooling for experiment • Coldhead is working properly • Temperature controller • Lakeshore 336 controller is being tested and tuned. • Heating function is working properly with PID control Achievements: • 40 K reached with no load on coldhead • Temperature control with PID setting is working fine To do: • Operate coldhead with detector and temperature controller

14. General Topics • Infrastructure at site (to be fixed in Oct. ) • Power supply (available) • Space to put FEE rack (fixed) • Space to put coldhead compressor (to be found in tunnel) • Cooling water for compressor (existing) • Ventilation status at site (Rack will be outside of tunnel) • Installation schedule • Target modification (after Week 16) • Day-one chamber installation (during Week 17-24) • Pumping time requested (not known yet) • Slow control system for day-1 setup • Pumps (integrated into COSY slow control system) • Beam time applied • On Week 30 and Week 39

15. Thanks for your attention!

17. Sketch of day-one experiment Large t-range (pbarp): 0.0008-0.1 GeV2 Starting with one recoil arm

18. Performance evaluation with pure elastic events Setting for event generator(DPM): Plab : 6.2 GeV/c, pure elastic events Theta_min : 0.113°(~1.98mrad) Events : 5M Parameters : σel = 18.97mb, σtot = 64.50mb, b = 11.89(GeV/c)-2, ρ = - 0.063 t: [0.0002-0.03] lumi: ~ 0.39% PANDA The measurable t is limited to a small range!