HCAL DPG Status

1. HCAL DPG Status Olga Kodolova Frank Chlebana HCAL General Meeting July 14, 2011

2. Outlook Calibration status 25 ns WG Plan for tests with HF timing after TS

3. Calibration status • - Phisym re-calibration of HF after sleeves exchange was done (Igor/Olga). • PVT requested this tag being tested by JetMET and PF. • Request was sent to JetMET POG and is on going. • - Isotrack re-calibration is on going (Anton) • Absolute scale calibration for HF with Z->ee, g/Z+jet is on going (Jeremy/Nural). • We expect the update on absolute scale both HBHE and HF on Monday, 18th of July - aim to get it ready in the second half of July.

4. Calibration specific • - Observation of the drift of HPD gains (~2%/month) – Pawel/Dima • We re-install phisym now. Need to monitor with LED and update calibration each month if it is outside the tolerance (Pawel/Dima) • Seems, no such problems with PMT • - CASTOR - calibration with muon flux • First calibration was done (Ekaterine) • - ZDC - neutrons (Michael)

5. 25 ns WG • WG to study HCAL with 25 ns bunch spacing was setup • Slawek Tkaczyk agreed to organize this group • We suppose weekly meetings for ~1 hour: extended HCAL DPG meeting and 1 hour meeting in the alternate weeks from 15:30-16:30. • Regular short status (5-10 minutes) reports from particular tasks • Extended meeting at the end of August-beginning of September

6. 25 ns WG • No special twiki but minutes will be posted each week to indico agenda • E-mail exchange through the regular HCAL DPG mail list with [25 ns WG] in subject

7. Scope of WG work - I • Data volume (in particular HF, but also check for HBHE) • A few options for HF is considered (J.Mans talk at 25 ns WG) • more FED – maximum 3 additional DCC- require recabling/remapping. • data format change – require coincidence with SW releases • number of TS change – can be done now • combinations of the proposed options

8. Scope of WG work - II • L1 Trigger study (Greg and Tutanon) • Pileup subtraction algorithm for TPs • Approach may appear to be different for HBHE and HF. If we use 1 TS for HF we may not need to do pileup subtraction. • Algorithm exists both in L1 emulator and Firmware but was not enough tested • First test with the current data will be presented at HCAL DPG extended meeting on the 18th of July.

9. Scope of WG work - III • Reconstruction of HBHE/HF signals (PFG group under leadership of Shuichi) • Study of pulse shape/phase settings/number of TSs/Noise (together with Noise WG) • Task list was presented by Shuichi at 25 ns WG • meeting (11th of July) • Volunteers are welcome • Regular weekly PFG2 meetings (Tuesday, 17:00) • Mini-workshop at the end of August (22-26).

10. Scope of WG work - IV • Simulation • Pulse shape and phase in MC should be verified/tuned to reflect data • Start to be crucial as we suppose to reduce number of TSs in HBHE and correct for the leakage • Calibration methods and workflow • What and how we should change for 25 ns

11. HF timing (plan for test after Technical Stop) Two options (depends on the accelerator plans): • Do HF scan without CMS magnet will use 50 bunch (1st point) and 268 bunch (2nd point) No use of HLT menu Interfill menu + technical bit 8 No BX-1 veto NZS only for HF

12. Continuation • 2. Wait until magnet is on • 2 &50 bunch (1st point) fill and 268 bunch (2nd point) • Special L1&HLT menu • Disable HLT filters • No BX-1 veto • NZS only for HF • This option may be preferable but we depend on • The machine schedule

13. Other items • Pledges: we sent e-mail and got 12 responses • We start to build repository with the approved material. The review will be on Monday, July 18.