BNMR: Histograms and Scalers
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Introduction
In the frontend, data is read from the VME scaler(s) (SIS3801 or SIS3820) and saved in histograms. The number of histograms is greater than the number of active scaler channels. For example, some scaler data are saved in separate histograms according to the helicity. In the case of Type 1 runs, the histograms are sent every cycle, whereas for Type 2 the histograms are accumulated in the frontend memory, and sent every few minutes. A data logger running on the host computer saves the data onto disk. The data is handled differently for Type 1 and Type 2 runs. For Type 1 runs, the data are saved in a MIDAS file by mlogger, and converted to MUD format by mdarc. For Type 2 runs, mdarc saved the data directly in a MUD file, and no MIDAS file is produced.
The histograms and data logging will therefore be described separately for Type 1 and Type 2 runs.
Front-end histograms and Cycle Scalers
Scaler Channels : Hardware Connections
Currently,
- experiment bnmr has two SIS3801 scalers
- experiment bnqr has one SIS3820 scaler
- NOTE
- The sis3820 scaler is needed for bnqr alpha mode as it has a larger buffer and greater resolution.
BNMR
| Scaler | Module | Channel | Contents |
|---|---|---|---|
| A | SIS3801 | 1 | Front scalers (16 segments summed in hardware) |
| 2 | Front scalers (16 segments summed in hardware) | ||
| Total number of real scaler inputs : 2 | |||
| Scaler | Module | Channel | Contents |
|---|---|---|---|
| B | SIS3801 | 1 | Scaler Internal Clock (not connected) |
| 2 | Fluorescence Monitor (not used) | ||
| 3,4 | Polarimeter counters (2) | ||
| 5,6,7,8 | Neutral Beam Forwards counters (4) | ||
| 9,10,11,12 | Neutral Beam Backwards counters (4) | ||
| Total number of real scaler inputs : 12 | |||
BNQR
| Scaler | Module | Channel | Contents |
|---|---|---|---|
| B | SIS3820 * | 1 | Scaler Internal Clock (not connected) |
| 17 | Fluorescence Monitor (not used) | ||
| 18,19 | Polarimeter counters (2) | ||
| 20 | Neutral Beam Forwards counter (summed in hardware) | ||
| 21 | Neutral Beam Backwards counter (summed in hardware) | ||
| 22,23,24,25 | Alpha Counters | ||
| Total number of real scaler inputs : 10 | |||
- NOTE
- * SIS3820 module has ECL inputs 1-16, NIM 17-32. Therefore BNQR's input channel start at 17 (NIM).
Midas histograms built in the frontend
Type 1
Only includes data from last cycle.
Table 4: Scaler A histograms (bnmr only)
| Scaler A |
|
|
|
| sum Back scalers |
|
|
|
| sum Front scalers |
|
|
|
| userbits |
|
|
|
| Total number of BNMR Scaler A histograms: 3 | |||
Table 5 : Scaler B histograms (bnmr)
| Scaler B |
|
|
|
| sum scaler B (scaler clock) |
|
|
|
| sum scaler B (fluorescence mon) |
|
|
|
| sum scaler B (pol monitor 1) |
|
|
|
| sum scaler B 3 (pol monitor 2) |
|
|
|
| sum scaler B (Backwards neutral beam monitors) |
|
|
|
| sum scaler B (Forwards neutral beam monitors) |
|
|
|
| Total number of BNMR Scaler B histograms: 6 | |||
Total number of histograms from both scalers: 9 bnmr
Table 6 : Scaler B histograms (bnqr)
| Scaler B |
|
|
|
| sum scaler B (scaler clock) |
|
|
|
| sum scaler B (fluorescence mon) |
|
|
|
| sum scaler B (pol monitor 1) |
|
|
|
| sum scaler B 3 (pol monitor 2) |
|
|
|
| sum scaler B (Backwards neutral beam monitors) |
|
|
|
| sum scaler B (Forwards neutral beam monitors) |
|
|
|
| userbits |
|
|
|
| Total number of BNQR histograms: 7 | |||
| Alpha mode (1h) only | |||
| Alpha1 |
|
|
|
| Alpha2 |
|
|
|
| Alpha3 |
|
|
|
| Alpha4 |
|
|
|
| userbits |
|
|
|
| Total number of BNQR histograms (Alpha mode): 11 | |||
- NOTE
- ** Userbit bank is always the final bank
Type 2
For Type 2 (TD style), Midas histograms are built in the PPC frontend.
Histograms accumulate through the run
4 histograms from Scaler A:
10 Histograms from Scaler B:
Total histograms : 10 for BNQR,
14 for BNMR
Table 7: Scaler A histograms (bnmr only)
|
Contents |
Helicity |
|
Bank Name |
Histogram Name |
| Back Scalers + | 1 | A | HIBP | B+ |
| Front Scalers + | 1 | A | HIFP | F+ |
| Back Scalers - | 0 | A | HIBN | B- |
| Front Scalers - | 0 | A | HIFN | F- |
Table 8: Scaler B histograms (bnmr and bnqr)
|
Contents |
Helicity |
|
Bank Name |
Histogram Name |
| Reference Ticks | n/a | B | HMF1 | Const |
| Fluorescence monitor | n/a | B | HMF2 | FluM2 |
| Polarimeter Left + | 1 | B | HMLP | L+ |
| Polarimeter Right + | 1 | B | HMRP | R+ |
| Polarimeter Left - | 0 | 2 | HMLN | L- |
| Polarimater Right - | 0 | 3 | HMRN | R- |
| Neutral Beam Backwards + | 1 | B | HMBP | NBMB+ |
| Neutral Beam Forwards + | 1 | B | HMFP | NBMF+ |
| Neutral Beam Backwards - | 0 | B | HMBN | NBMB- |
| Neutral Beam Forwards - | 0 | B | HMFN | NBMF- |