EPD Timing by Run
Some questions about our gate settings have come up. Here they are:
Run 22 (pp510):
Actual Default
EPD_QTb_E_Gate_End_Delay 71 48
EPD_QTb_E_Gate_Start_Delay 55 32
EPD_QTb_W_Gate_End_Delay 81 48
EPD_QTb_W_Gate_Start_Delay 65 32
EEPD_QTc_E_Gate_End_Delay 41 39
EPD_QTc_E_Gate_Start_Delay 25 23
EEPD_QTc_W_Gate_End_Delay 51 39
EPD_QTc_W_Gate_Start_Delay 35 23
Run 21 (AuAu7 and others)
EPD_QTb_E_Gate_End_Delay 48 ---
EPD_QTb_E_Gate_Start_Delay 32 ---
EPD_QTb_W_Gate_End_Delay 48 ---
EPD_QTb_W_Gate_Start_Delay 32 ---
EPD_QTc_E_Gate_End_Delay 39 ---
EPD_QTc_E_Gate_Start_Delay 23 ---
EPD_QTc_W_Gate_End_Delay 39 ---
EPD_QTc_W_Gate_Start_Delay 23 ---
Run 20 (AuAu11.5)
EPD_QTb_E_Gate_End_Delay 48 ---
EPD_QTb_E_Gate_Start_Delay 32 ---
EPD_QTb_W_Gate_End_Delay 48 ---
EPD_QTb_W_Gate_Start_Delay 32 ---
EPD_QTc_E_Gate_End_Delay 39 ---
EPD_QTc_E_Gate_Start_Delay 23 ---
EPD_QTc_W_Gate_End_Delay 39 ---
EPD_QTc_W_Gate_Start_Delay 23 ---
Run 19 (AuAu19, 14.5)
EPD_QTb_E_Gate_End_Delay 48 48
EPD_QTb_E_Gate_Start_Delay 32 32
EPD_QTb_W_Gate_End_Delay 48 48
EPD_QTb_W_Gate_Start_Delay 32 32
EPD_QTc_E_Gate_End_Delay 39 39
EPD_QTc_E_Gate_Start_Delay 23 23
EPD_QTc_W_Gate_End_Delay 39 39
EPD_QTc_W_Gate_Start_Delay 23 23
Run 18 (AuAu27 Isobar)
EPD_QT_Gate_End_Delay 48 48
EPD_QT_Gate_Start_Delay 32 32
EPD_QTc_Gate_End_Delay 39 39
EPD_QTc_Gate_Start_Delay 23 23
EPD_QTc_TAC_Stop 64 64
Page 17 of: https://drupal.star.bnl.gov/STAR/system/files/UsingRunControlEPD.pdf gives a good visual
Mike's blog on how we do the timing: https://drupal.star.bnl.gov/STAR/blog/lisa/epd-timing-scan-run-2018
The key math from this is:
- EPD_QT_Gate_Start_delay
- EPD_QT_Gate_Stop_delay = EPD_QT_Gate_Start_delay+16 (subtract N*108 as necessary to get in range [0,255])
- EPD_QTc_Gate_Start_delay
- EPD_QTc_Gate_Stop_delay = EPD_QTc_Gate_Start_delay+16 (subtract N*108 as necessary to get in range [0,255])
- EPD_QTc_Gate_TAC_Stop = 18 + 2*EPD_QTc_Gate_Start_delay (subtract N*2*108 as necessary to get in range [0,255])
- rjreed's blog
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