Comparison of Qweak and HAPPEX ADCs for Data Acquisition Status

Layout and present status comparison of Qweak and HAPPEX ADCs for Data Acquisition status. Includes inventory details, possible upgrades, and discussions on integrating signals over the helicity period. Highlights differences in design and specifications between the two ADC systems, along with recent work on adjusting resistors for improved performance. Collaboration details from PREX/CREX meeting.

• Data Acquisition
• Qweak
• HAPPEX
• ADCs
• Signal Integration

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1. Data Acquisition (DAQ) Status Layout of DAQ Inventory and Present Status Comparison of Qweak and HAPPEX ADCs Possible Upgrades To Do List PREX/CREX Collab. Mtg, Oct 1-2, 2017 Bob Michaels, JLab

2. Parity DAQ Right Spectrometer Left Spectrometer RS485 Trigger Supervisor RS485 1 Qweak (*) 2 HAPPEX 2 Qweak 2 HAPPEX Spare ADCs Counting House 2 Qweak (*) 10 HAPPEX Each crate has 6100 cpu, TI board ( old style), HAPPEX timer board, 3801 scaler 5 Qweak 4 HAPPEX (*) - Don t have in hand yet, but Dustin has 2 network network Injector 11 Qweak no HAPPEX scalers Tape (MSS) Event Builder PREX/CREX Collab. Mtg, Oct 1-2, 2017 Bob Michaels, JLab

3. From Qweak: TRIUMF VME integrator Ext NIM Gate Status LEDs VME Access Ext Clock Enb Ext Gate Enb 8 inputs Ext NIM Clock Analog Filters VME Module Select Switches ADC FPGA Prog/ Debug Ports DC-DC Converter FPGA

4. From Qweak: TRIUMF VME integrator Ext NIM Gate Status LEDs VME Access Ext Clock Enb Ext Gate Enb 8 inputs Ext NIM Clock Analog Filters VME Module Select Switches Good module with excellent specs Input +/- 10 volt 500 ksps sampling, 18-bit ADCs, output: 32-bit sum Superior bit resolution, more convenient dynamic range in comparison to HAPPEX ADCs. DAC noise not needed (given resolution and Shot noise) Engineering support ?? -- unclear, at present. ADC FPGA Prog/ Debug Ports DC-DC Converter FPGA

5. Put your detector PMT into this, output goes to ADC Note, we ve reconfigured the HAPPEX ADCs to also require these preamps. ADC PMT PREX/CREX Collab. Mtg, Oct 1-2, 2017 Bob Michaels, JLab

6. Integrate signals over the helicity period, same aim as Qweak ADCs but different design. HAPPEX ADCs Used by HAPPEX-III and PREX-I PREX/CREX Collab. Mtg, Oct 1-2, 2017 Bob Michaels, JLab

7. Recent work: resistors adjusted so that ADC works for 0 5 V for 30 Hz < f < 240 Hz HAPPEX ADCs Will be made available for any of our detector or beamline signals. DAC noise pickup issue (10 ppm noise which mostly cancels ) Only V mode now, the I mode needs the preamps (same as Qweak ADC) PREX/CREX Collab. Mtg, Oct 1-2, 2017 Bob Michaels, JLab

8. Recent work on HAPPEX ADC :resistors adjusted so that ADC works for 0 5 V for 30 Hz < f < 240 Hz Example of calibration plot PREX/CREX Collab. Mtg, Oct 1-2, 2017 Bob Michaels, JLab

9. DAQ Inventory and Needs Deployed in our DAQ now Item Spares on Hand Needed Qweak ADCs 18 (*) 0 3 HAPPEX ADCs 8 10 Model 6100 cpu 4 2 Model 5100 cpu in TS 1 2 Crates including TS 5 2 Trigger Interrupt (TI) 4 2 Trigger Supervisor 1 1 HAPPEX Timer 4 6 Flexio board 1 0 3 Model 3801 Scalers 4 2 Model 7200 Scaler 1 (injector) 0 1 Intel / Linux VME cpu 0 0 5 + 1 spare (**) (*)I hear there are a few more Qweak ADCs in a cabinet at Jlab. Also, 2 at Idaho State (**)If using CODA 3 PREX/CREX Collab. Mtg, Oct 1-2, 2017 Bob Michaels, JLab

10. CODA 2.6.2 CODA 2.5 We should consider It s what the DAQ group supports Fits better with new computers But costs money (new cpus) CODA 3 PREX/CREX Collab. Mtg, Oct 1-2, 2017 Bob Michaels, JLab

11. DAQ Test Stand Located in the TEDF building (Technology Engineering and Development Facility) 2 DAQ crates, computers, NIM electronics, test bench (adjacent cubicle unused). PREX/CREX Collab. Mtg, Oct 1-2, 2017 Bob Michaels, JLab

12. To Do List for DAQ(and related) Job Status Revive all crates Mostly accomplished Feedback Underway, needed by Injector Studies Run-dependent database generation Software exists, need to revive Coil pulsing ditto Panguin ditto Prompt analysis ditto Synchronization check Dismantled, need to revive E-logbook entries Needs work since new E-logbook DAQ for GEMs ? The rest of the HRS DAQ is ready. Upgrade to CODA 3 ??? An idea. We can start on test crate PREX/CREX Collab. Mtg, Oct 1-2, 2017 Bob Michaels, JLab

13. The End Backup slides on DAC noise pickup follows. PREX/CREX Collab. Mtg, Oct 1-2, 2017 Bob Michaels, JLab

14. HAPPEX ADCs DAC noise is added to base and peak , then subtracted. This reduces differential nonlinearities. However, the DAC noise is also picked up and produces noise in the ADC value (peak minus base). ADC value Time ADC value At the right, we ve reduced DAC noise to 800 channels with reduced stepsize of 4. Residual noise is 4 channels RMS. Time PREX/CREX Collab. Mtg, Oct 1-2, 2017 Bob Michaels, JLab

15. Current status of DAC noise pickup: it causes a ~10 ppm noise floor (not helicity correlated). PREX/CREX Collab. Mtg, Oct 1-2, 2017 Bob Michaels, JLab